JP2006213102A - Webbing winder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a webbing winder capable of arranging the other part of a webbing belt in the close vicinity of a lock base on the opposite side of a spool of the lock base, without projecting a wire and a wire holding member to the opposite side of the spool of the lock base. <P>SOLUTION: This webbing winder 10 prevents a bar-shaped part 202 from slipping out of an insertion hole 204, by regulating displacement to the spool 24 side, by allowing a flange-shaped stopper 208 threadedly engaged with a male screw formed in the bar-shaped part 202 of the wire 196 in the insertion hole 204 to abut on an abutting surface 212 of a regulating wall 210 being a bottom part of the insertion hole 204. Here, the tip of the stopper 208 and the bar-shaped part 202 does not project to the opposite side of the spool 24 from the insertion hole 204. Thus, even if the other member of the webbing winder 10 is closely adjacently arranged in the vicinity of an end surface on the opposite side of the spool 24 of the lock base 170, this other member does not interfere with the stopper 208 and the bar-shaped part 202. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a webbing retractor that constitutes a seat belt device for restraining the body of a vehicle occupant with a long belt-like webbing belt.

  A seat belt device provided corresponding to a seat of a vehicle includes a webbing take-up device that winds and stores a long belt-like webbing belt that restrains the body of an occupant seated on the seat. This type of webbing take-up device is provided with, for example, a lock mechanism that restricts the rotation of the spool when the webbing belt is pulled out in the vehicle suddenly decelerating state (hereinafter, this rotational direction is referred to as the “drawing direction” for convenience). Thus, the lock mechanism restricts the rotation of the spool in the pull-out direction, so that the withdrawal of the portion wound around the spool of the webbing belt is restricted.

  As a result, even if the occupant's body that is about to move inertially toward the vehicle front side in the vehicle suddenly decelerating state pulls the webbing belt, the webbing belt is not pulled out. Regulated by webbing belt.

  Further, in this type of webbing take-up device, a lock base whose rotation in the pull-out direction is restricted by a lock mechanism is provided so as to be relatively rotatable coaxially with the spool, and a rod-like shape provided at the shaft center portion of the spool. There is a type including a force limiter mechanism in which one end of the torsion shaft is integrally connected to the spool and the other end is integrally connected to the lock base.

  When the webbing take-up device equipped with such a force limiter mechanism is controlled by the lock mechanism and the rotation of the lock base in the pull-out direction is restricted, the torsion The shaft is torsionally deformed, and the spool is allowed to rotate in the pulling-out direction by this amount of twisting, and hence the webbing belt is pulled out.

  In this manner, even when the lock mechanism is in an operating state, the load that the occupant receives from the webbing belt can be reduced by allowing the webbing belt to be pulled out from the spool.

  Further, the force limiter mechanism has a configuration in which a wire is provided in addition to the torsion shaft, and an example thereof is disclosed in Patent Document 1 below.

  In a webbing take-up device provided with this type of force limiter mechanism, a groove that is curved around the axis of the spool is formed at the end of the spool on the lock base side. The spool is formed with a hole parallel to its axis, and this hole opens at the bottom of the groove. The wire is accommodated in the hole on the proximal side in the longitudinal direction.

  The middle portion of the wire in the longitudinal direction is a portion protruding from the opening end of the hole, and is accommodated in the groove while being curved in the winding direction opposite to the drawing direction along the groove, and the tip of the wire penetrates the lock base. In the state which penetrated the through-hole, it is prevented from coming off from this through-hole.

  As described above, when the spool rotates in the pull-out direction in a state where the lock base is restricted by the lock mechanism, the base end side of the wire is pulled out from the hole of the spool. When the wire is drawn out from the hole of the spool, the wire is accommodated in the groove on the winding direction side of the spool hole while being deformed along the groove while being squeezed by the opening edge of the hole of the spool.

  The load required when the wire is deformed is superimposed on the load required for the torsional deformation of the torsion shaft. Therefore, in order to rotate the spool in the pull-out direction while the rotation of the lock base is regulated by the lock mechanism, a rotational force that only deforms both the torsion shaft and the wire, that is, a pulling force on the webbing belt is required. Become.

In addition, when all of the proximal end side in the longitudinal direction of the wire comes out of the hole of the spool during the torsional deformation of the spool, the wire is not deformed. Therefore, after that, the spool can rotate in the pull-out direction only with a load (rotational force) required for torsional deformation of the torsion shaft. Thereby, in this state, the load that the occupant receives from the webbing belt can be further reduced.
JP 2003-146183 A

  By the way, the force limiter mechanism having the wire as described above is configured so that the tip end side (lock base side) of the wire is surely prevented from coming out from the hole formed in the lock base. , The tip of the wire protrudes to the opposite side, and the outer periphery of the protruding portion is held by a holding member.

  However, by projecting the tip end of the wire to the opposite side of the lock base spool in this way, the tip of the wire is attached to other parts of the webbing take-up device arranged on the opposite side of the lock base spool. Other parts of such a webbing take-up device must be placed away from the lock base so as not to interfere. For this reason, it is difficult to reduce the size of the webbing take-up device.

  In consideration of the above facts, the present invention locks other parts of the webbing belt on the opposite side of the lock base spool without protruding the wire or the member holding the wire on the opposite side of the lock base spool. The object is to obtain a webbing take-up device that can be placed close to the base.

  In the webbing take-up device according to the first aspect of the present invention, the base end side in the longitudinal direction of the long belt-like webbing belt is locked, and the webbing belt is based on rotation in one winding direction around its own axis. In a state where the spool is wound around the outer periphery from the end side, and is integrally connected to the spool in a state adjacent to the one end portion on the side of the one axial end portion of the spool, and the rotation of the spool itself is restricted, A rotating body capable of rotating the spool in the pulling-out direction by applying a rotational force in a pulling-out direction opposite to the winding direction to a certain size or more, and directly or indirectly to the rotating body. At least one of a lock mechanism for restricting rotation in the pull-out direction opposite to the winding direction, and an axial end of the spool and an end surface of the rotating body on the spool side. Either formed When the spool is displaced in the winding direction with respect to the rotating body, the middle portion in the longitudinal direction is accommodated in a guide groove that opens toward the direction and the longitudinal direction is inclined with respect to the axial direction of the spool. A wire that is deformed by the spool or the rotating body by moving in the guide groove while rotating relative to the spool or the rotating body, and an end surface of the rotating body opposite to the spool. And holding means for holding the tip end side of the wire so that the tip end of the wire can be relatively rotated with respect to either one of the rotating body and the spool.

  According to the webbing take-up device of the present invention as set forth in claim 1, when the webbing belt is pulled to the tip end side, the webbing belt is wound around the spool by rotating the spool around the axis in the drawing direction. Pulled out. The occupant's body is restrained by the webbing belt when the occupant wears the webbing belt pulled out in this way.

  With such a webbing belt attached, for example, when the vehicle suddenly decelerates and the occupant's body is about to move to the front side of the vehicle, the webbing belt attached to the occupant's body is pulled by the occupant's body. Thus, a rotational force in the pull-out direction is applied to the spool.

  In this state, when the rotating body integrally connected to the spool is locked by the lock mechanism and the rotation of the rotating body in the pulling-out direction is restricted, the rotation of the spool in the pulling-out direction is restricted, Pulling out the webbing belt is restricted. In this way, by restricting the pulling out of the webbing belt, the occupant's body is securely held by the webbing belt, and the inertial movement of the occupant's body toward the front side of the vehicle substantially in the vehicle sudden deceleration state is restricted.

  Further, the pulling force applied to the webbing belt by the body of the occupant attempting to move inertia substantially toward the front side of the vehicle as described above exceeds a certain level, and the rotational force in the pulling-out direction of the spool based on this is constant. When the size is exceeded, the spool rotates in the pull-out direction with respect to the rotating body whose rotation in the pull-out direction is restricted by the lock mechanism.

  Here, a longitudinal guide groove is formed in a direction orthogonal to the axial direction of the spool (including the rotational circumferential direction of the spool) at one end of the spool in the axial direction or the end surface on the spool side of the rotating body. The guide groove accommodates a middle portion in the longitudinal direction of the wire. Since the tip of the wire is held by the holding means so as to be rotatable relative to either one of the spool and the rotating body, when the spool rotates in the pulling direction with respect to the rotating body as described above. The other of the spool and the rotating body rotates relative to the wire.

  In this way, when either the spool or the rotating body rotates relative to the wire, the wire is deformed by either the spool or the rotating body. The load used for the deformation of the wire is a so-called “force limiter load”, and as described above, the resistance of the spool rotating in the pull-out direction and, as a result, attempts to pull out the webbing belt by the inertial movement substantially toward the front side of the vehicle. This is the load applied to the occupant by the webbing belt.

  Here, in the webbing take-up device according to the present invention, the holding means is provided on the spool side with respect to the end surface opposite to the spool of the rotating body to hold the tip of the wire. Thereby, the front-end | tip of the wire and protrusion of a holding means to the opposite side to a spool rather than the end surface on the opposite side to the spool of a rotary body can be prevented or suppressed. For this reason, the other member can be disposed close to the rotating body without interfering with the other members constituting the webbing take-up device on the side opposite to the spool of the rotating body without interfering with the wire or the holding member.

  A webbing take-up device according to a second aspect of the present invention is the webbing take-up device according to the first aspect of the present invention, wherein the webbing take-up device is provided on the distal end side of the wire inclined with respect to the longitudinal direction of the guide groove. A flange having a length along at least one direction intersecting with the longitudinal direction of the wire on the side larger than a dimension on the proximal side with respect to the distal end of the wire along the one direction, and the flange can be inserted Provided in the insertion hole formed in one of the spool and the rotating body, and abuts against the flange from the proximal end side of the wire along the longitudinal direction on the distal end side of the wire. And a restricting means having a contact surface for restricting the movement of the flange in a direction of coming out from the hole to the other side of the spool and the rotating body. It said flange of said insertion hole in the spool side of the end face of the rotating body on the opposite side is located the Lumpur, is characterized by.

  In the webbing take-up device according to the second aspect of the present invention, the tip end side of the wire is inclined with respect to the longitudinal direction of the guide groove, and a flange is formed at the tip end portion. The length of the flange along at least one direction intersecting the longitudinal direction of the wire on the distal end side of the wire is larger than the dimension on the proximal end side with respect to the distal end of the wire along the one direction.

  The distal end side of the wire on which the flange is formed is inserted into an insertion hole formed in either the spool or the rotating body.

  A restricting means having an abutment surface is provided inside the insertion hole, and when the tip of the wire tries to come out from the insertion hole to either the spool or the rotating body, the proximal end side of the wire from the flange Thus, the contact surface facing the flange contacts the flange. In this way, the contact surface of the restricting means abuts on the flange, whereby the movement of the flange toward the proximal end side of the wire is restricted, and the movement on the distal end side of the wire in the direction of coming out of the insertion hole is restricted.

  For this reason, when the spool rotates in the pull-out direction with respect to the rotating body, the wire rotates relative to either one of the spool and the rotating body, and either of the other is caused by the relative rotation thus generated. Deforms the wire.

  Here, in the insertion hole, the flange is positioned on the spool side with respect to the end surface of the rotating body opposite to the spool. For this reason, even if other members of the webbing take-up device are arranged close to the end surface of the rotating body opposite to the spool, the flange does not interfere with the other members.

  A webbing take-up device according to a third aspect of the present invention is the webbing retractor according to the second aspect, wherein the flange is connected to the spool and the rotating body from the side where the insertion hole is not formed. A guide hole that is open so as to be insertable and communicated movably in the insertion hole toward a position where the flange inserted inward faces the abutting surface is formed between the spool and the rotating body. The insertion hole is formed on the side where the insertion hole is formed.

  According to the webbing take-up device according to the third aspect of the present invention, the guide hole is formed in the spool and the rotating body where the insertion hole is formed. A flange of the wire is inserted into the guide hole from the side of the spool and the rotating body where the insertion hole is not formed.

  Further, the guide hole communicates with the insertion hole. When the flange inserted into the guide hole is moved toward the insertion hole, the flange faces the contact surface of the restricting means in the insertion hole.

  As a result, when the wire is about to come out from the insertion hole, the contact surface comes into contact with the flange and the movement of the wire is restricted.

  Further, as described above, the flange moves from the guide hole to the insertion hole, so that the flange is disposed to face the contact surface. For this reason, even if the restricting means is provided in the insertion hole in advance, the restricting means does not become an obstacle to the flange when the flange enters the insertion hole. For this reason, the restricting means can be integrally formed in the insertion hole in advance.

  A webbing retractor according to a fourth aspect of the present invention is the webbing retractor according to the first aspect of the present invention, wherein the spool is displaced with respect to the guide groove along the rotational axis direction of the spool and the rotating body. Of the spool and the rotating body, a hole is formed in a direction in which the wire is not deformed while being rotated in the pull-out direction of the spool relative to the rotating body, and at least the rotating body of the spool and the rotating body with respect to the longitudinal direction of the guide groove. The distal end side of the bent portion of the wire bent in parallel to the rotation axis is accommodated in the hole portion on the spool side with respect to the surface opposite to the spool of the rotating body, and the rotation The hole is provided in the hole on the spool side with respect to the surface opposite to the spool of the body, and is more distal than the bent portion when rotating in the pull-out direction of the spool with respect to the rotating body. Interference along the circumferential direction of the spool with respect to the outer periphery of the wire, and movement in the direction of exiting from the hole on the distal end side of the wire to the one of the other side with respect to the bent portion. The holding means is configured to include an interference means for limiting by friction with the wire.

  According to the webbing take-up device according to the fourth aspect of the present invention, the tip end side of the wire is bent parallel to or more than the rotation axis of the rotating body with respect to the longitudinal direction of the guide groove ( That is, it is bent at least parallel to the rotation axis of the rotating body).

  On the other hand, a hole is formed in the spool and the rotating body that do not deform the wire when the spool rotates in the pull-out direction with respect to the rotating body. The hole portion is formed at a position displaced from the guide groove along the rotation axis direction of the spool and the rotating body, and the tip end side is accommodated in the hole portion with respect to the bent portion of the wire.

  When the spool rotates in the pull-out direction with respect to the rotating body, the wire tends to come out from the hole. As described above, the distal end side of the wire accommodated in the hole is at least relative to the rotation axis of the rotating body. When the bent portion is bent in parallel and tries to come out of the hole, the interference means interferes with the distal end side of the wire bent portion along the circumferential direction of the spool.

  If the wire still tries to come out of the hole in this interference state, friction occurs between the interference means and the wire, and this friction becomes resistance to movement of the wire on the tip side that tries to come out of the hole. Thereby, it is prevented or effectively suppressed that the tip of the wire comes out of the hole.

  For this reason, when the spool rotates in the pull-out direction with respect to the rotating body, the wire rotates relative to the spool and the rotating body where the hole is formed and the hole is not formed. The wire is deformed by the direction in which the hole is not formed by the relative rotation generated as described above.

  Here, the tip end side of the wire is accommodated in the hole on the spool side of the surface opposite to the spool of the rotating body, and the interference means has a hole on the spool side of the surface opposite to the spool of the rotating body. Provided in the section. For this reason, even if other members of the webbing take-up device are disposed close to the end surface opposite to the spool of the rotating body, the wires and the interference means do not interfere with the other members.

  A webbing retractor according to a fifth aspect of the present invention is the webbing take-up device according to the first aspect of the present invention, wherein the webbing take-up device according to the first aspect is provided on the spool side with respect to a surface of the rotating body opposite to the spool. Of the holding member that holds the tip, and the spool and the rotating body, the spool is formed in a direction in which the wire is not deformed in a rotation state in the pull-out direction of the spool with respect to the rotating body, and extends along the circumferential direction of the spool The holding means is configured to include a restricting portion that restricts displacement of the holding member.

  In the webbing take-up device according to the fifth aspect of the present invention, the tip of the wire is held by the holding member. When the spool tries to rotate in the pull-out direction with respect to the rotating body, the displacement of the holding member along the circumferential direction of the spool is restricted by the restricting portion formed on the spool and the rotating body so that the wire is not deformed by the rotation. Is done.

  Therefore, of the spool and the rotating body, the holding member, that is, the wire rotates relative to the direction of deforming the wire by the rotation, and the wire is deformed by the direction of deforming the wire by the relative rotation. .

  Here, the holding member is provided on the spool side with respect to the surface of the rotating body opposite to the spool. For this reason, even if another member of the webbing take-up device is disposed close to the end surface of the rotating body opposite to the spool, the tip of the wire held by the holding member or the holding member interferes with the other member. There is nothing to do.

  A webbing take-up device according to a sixth aspect of the present invention is the webbing take-up device according to the first aspect of the present invention, wherein the holding means is provided on the spool and is rotatable with the spool. The holding means holds the tip end side of the wire, and the rotating body deforms the wire by the rotation of the spool in the pulling direction with respect to the rotating body.

  In the webbing take-up device according to the sixth aspect of the present invention, the holding means is provided on the spool, and when the spool rotates in the pull-out direction with respect to the rotating body, the wire rotates along the spool in the pull-out direction. Thus, when the wire rotates in the pull-out direction together with the spool, the wire is deformed by the rotating body.

  Thus, the holding means is provided on the spool, so that the holding means is positioned on the spool side with respect to the rotating body. Accordingly, the holding means and the tip end side of the wire held by the holding means do not protrude to the opposite side of the spool from the end surface of the rotating body opposite to the spool.

  For this reason, even if another member of the webbing take-up device is disposed close to the end surface opposite to the spool of the rotating body, the holding means and the distal end side of the wire held by the holding means interfere with this other member. There is nothing to do.

  The webbing take-up device according to a seventh aspect of the present invention is such that the base end side in the longitudinal direction of the long belt-like webbing belt is locked, and the webbing belt is based on rotation in one winding direction around its own axis. The spool is wound around the outer periphery from the end side and is formed with a spool side insertion hole opened at one end in the axial direction, and the spool is adjacent to the one end at the side of the one end in the axial direction of the spool. In addition, when the rotation of the spool is restricted, a rotational force in a pulling direction opposite to the winding direction is applied to the spool in a state where the rotation of the spool is restricted. A rotating body rotatable in the pull-out direction; a lock mechanism that directly or indirectly engages the rotating body and restricts rotation in a pull-out direction opposite to the winding direction; the spool and the rotation At least what the body Formed on either side and communicating with the opening end of the spool side insertion hole, and the longitudinal direction is inclined with respect to the opening direction of the spool side insertion hole, and the spool rotates in the pull-out direction with respect to the rotating body. In the state before the operation, at least a part of the longitudinal direction intermediate portion is accommodated in the guide groove that is located on the winding direction side with respect to the opening end of the spool side insertion hole, and the longitudinal direction proximal end side with respect to the intermediate portion And the wire that is bent and inserted into the spool-side insertion hole, and is closer to the spool side than the end surface of the rotating body on the drawing direction side than the opening end of the spool-side insertion hole and on the opposite side of the spool. In the state where the spool is provided in the rotating body and the spool is rotated in the drawing direction with respect to the rotating body, the tip of the wire comes into contact with the leading end side from the drawing direction side, and the tip of the wire in the drawing direction It includes a limiting means for limiting the displacement of the side, a.

  According to the webbing take-up device of the present invention as set forth in claim 7, when the webbing belt is pulled to the tip end side, the webbing belt is wound around the spool by rotating the spool around the axis in the drawing direction. Pulled out. The occupant's body is restrained by the webbing belt when the occupant wears the webbing belt pulled out in this way.

  With such a webbing belt attached, for example, when the vehicle suddenly decelerates and the occupant's body is about to move to the front side of the vehicle, the webbing belt attached to the occupant's body is pulled by the occupant's body. Thus, a rotational force in the pull-out direction is applied to the spool.

  In this state, when the rotating body integrally connected to the spool is locked by the lock mechanism and the rotation of the rotating body in the pulling-out direction is restricted, the rotation of the spool in the pulling-out direction is restricted, Pulling out the webbing belt is restricted. In this way, by restricting the pulling out of the webbing belt, the occupant's body is securely held by the webbing belt, and the inertial movement of the occupant's body toward the front side of the vehicle substantially in the vehicle sudden deceleration state is restricted.

  Further, the pulling force applied to the webbing belt by the body of the occupant attempting to move inertia substantially toward the front side of the vehicle as described above exceeds a certain level, and the rotational force in the pulling-out direction of the spool based on this is constant. When the size is exceeded, the spool rotates in the pull-out direction with respect to the rotating body whose rotation in the pull-out direction is restricted by the lock mechanism.

  Here, the spool is formed with a spool-side insertion hole that opens at one axial end thereof, and the proximal end side in the longitudinal direction of the wire is inserted. A guide groove formed in one end of the spool in the axial direction and the end of the spool-side rotating body communicates with the spool-side insertion hole, and the middle portion in the longitudinal direction of the wire is bent to open the opening end of the spool-side insertion hole. It is accommodated in the guide groove in the pull-out direction.

  As described above, when the spool rotates in the pull-out direction with respect to the rotating body, the wire having the proximal end inserted through the spool-side insertion hole also tries to rotate in the pull-out direction together with the spool. However, the front end side in the longitudinal direction of the wire is interfered by the restricting means provided on the rotating body from the drawing direction side, thereby limiting the displacement in the drawing direction. The middle portion in the longitudinal direction of the wire whose tip side cannot be displaced in the drawing direction tends to be displaced in the winding direction with respect to the spool as the spool rotates in the drawing direction.

  However, since the proximal end side of the wire is inserted into the spool side insertion hole, the longitudinal intermediate portion of the wire is deformed from the portion facing the opening end of the spool side insertion hole as it is displaced to the winding direction side. Is pushed into the spool side insertion hole.

  Thus, when the wire is pushed into the spool side insertion hole, the load that is used to deform the wire becomes a so-called “force limiter load”, and the resistance of the spool that rotates in the pull-out direction as described above, that is, approximately the front side of the vehicle This is a load that the webbing belt gives to the body of the occupant trying to pull out the webbing belt by inertial movement.

  Here, in the webbing take-up device according to the present invention, the limiting means is provided on the rotating body on the spool side with respect to the end surface of the rotating body on the side opposite to the spool, and interferes with the leading end side of the wire. Therefore, the restricting means and the tip end side of the wire do not protrude beyond the end surface of the rotating body on the side opposite to the spool to the side opposite to the spool. For this reason, the other member can be disposed close to the rotating body without interfering with the other members constituting the webbing take-up device on the side opposite to the spool of the rotating body without interfering with the wire or the holding member.

  As described above, in the webbing take-up device according to the present invention, the wire and the member holding the wire do not protrude on the opposite side of the lock base spool, and on the opposite side of the lock base spool of the webbing belt. Other parts can be placed close to the lock base.

<Configuration of First Embodiment>
(Overall configuration of webbing take-up device 10)
First, the overall configuration of the webbing take-up device 10 according to the first embodiment of the present invention will be described.

  FIG. 3 is an exploded perspective view schematically showing the overall configuration of the webbing take-up device 10. As shown in this figure, the webbing take-up device 10 includes a frame 12.

  The frame 12 includes, for example, a plate-like back plate 14 having a thickness direction substantially along the left-right direction of the vehicle, and the back plate 14 is, for example, near the lower end of the center pillar by fastening means such as bolts. The webbing take-up device 10 is attached to the vehicle body by being fixed to the vehicle body.

  From one end in the width direction of the back plate 14 substantially along the vehicle front-rear direction, a leg plate 16 is bent toward the inner side in the vehicle width direction (substantially vehicle left-right direction). A leg plate 18 is bent from the other end in the width direction of the back plate 14 in the same direction as the leg plate 16.

  A spool 24 is provided between the leg plate 16 and the leg plate 18. The spool 24 is formed in a substantially cylindrical shape in the axial direction along the opposing direction of the leg plate 16 and the leg plate 18. An insertion hole 26 is formed in the spool 24.

  Both ends of the insertion hole 26 are opened at the outer peripheral portion of the spool 24, and the shape of the opening is a long slit shape along the axial direction of the spool 24. The insertion hole 26 is formed so as to avoid a through hole 28 penetrating the axial center portion of the spool 24, and the longitudinal direction proximal end side of the long belt-like webbing belt 30 is formed from one opening end of the insertion hole 26. It is inserted.

  A cylindrical portion 32 penetrating in the width direction is formed at the longitudinal base end portion of the webbing belt 30, and a retaining shaft 34 is disposed inside the cylindrical portion 32 that has passed through the insertion hole 26. Thus, the base end side of the webbing belt 30 is prevented from coming out of the insertion hole 26 when the webbing belt 30 is pulled toward the distal end side.

  The webbing belt 30 thus prevented from coming off from the insertion hole 26 is wound around the outer periphery of the spool 24 in a layered manner from the base end side by rotating the spool 24 in one winding direction around its own axis. And stored.

  On the other hand, a rod-like torsion shaft 36 that is formed in the longitudinal direction along the axial direction of the spool 24 is disposed inside the through hole 28. The torsion shaft 36 is connected to the spool 24 in a state in which the torsion shaft 36 is stopped around the axis inside the spool 24 on the leg plate 18 side. Furthermore, the end of the torsion shaft 36 on the leg plate 18 side penetrates the leg plate 18 and protrudes outward of the frame 12.

  A spring cover 38 is disposed outside the leg plate 18. The spring cover 38 has a box shape that opens toward the leg plate 18, and the spring cover 38 is fixed to the leg plate 18 by fitting means such as screws or fitting claws formed on the spring cover 38 or the leg plate 18. Has been.

  A spiral spring 40 is accommodated inside the spring cover 38. The spiral spring 40 is a spring having a structure in which the urging force gradually increases when the inner end in the spiral direction is rotationally displaced in the pulling direction opposite to the winding direction with respect to the outer end in the spiral direction. Is locked to a spring seat 42 provided on the opening side of the spring cover 38 with respect to the spiral spring 40.

  The spring seat 42 is fixed to the spring cover 38, and the spiral direction outer end of the spiral spring 40 is connected to the leg plate 18 (frame 12) via the spring seat 42 and the spring cover 38. An adapter 44 is provided in the vicinity of the spiral direction inner end of the spiral spring 40.

  A spiral direction inner end of the spiral spring 40 is fixed to a part of the outer periphery of the adapter 44. Further, the end portion on the leg plate 18 side of the torsion shaft 36 penetrating the spring seat 42 is fitted and fixed to the axial center portion of the adapter 44.

  On the other hand, a pretensioner 50 is provided outside the leg plate 16. The pretensioner 50 includes a cylinder 52.

  In the present embodiment, the cylinder 52 is plastically deformed so that the cross-sectional shape is appropriately deformed while maintaining internal communication at, for example, a bent portion 54 set at an intermediate portion in the axial direction of a metal pipe. It is formed by bending appropriately. One side in the axial direction from the bent portion 54 is a mounting portion 56. A gas generator 58 is attached to the opening end of the attachment portion 56.

  The gas generator 58 is electrically or mechanically connected to an acceleration sensor (not shown). When the acceleration sensor detects an acceleration (deceleration) when the vehicle is suddenly decelerated, the gas generator 58 has an internal structure. The gas generating agent provided in is ignited. As a result, the gas generating agent is burned in an extremely short time to generate gas instantaneously.

  A side of the bent portion 54 opposite to the mounting portion 56 is a cylinder body 60. Although the bent portion 54 is bent by plastic deformation as described above, the internal communication is ensured, so that the gas generated by the gas generator 58 attached to the attachment portion 56 is directed to the bottom side of the cylinder body 60. Supplied. A piston 62 is provided inside the cylinder body 60.

  The piston 62 is formed in a disk shape whose outer diameter is substantially equal to (in a strict sense, slightly smaller) the inner diameter of the cylinder body 60. A cylindrical holding portion 64 is coaxially and integrally formed with the piston 62 on the end surface of the piston 62 facing the bottom side of the cylinder body 60. The holding portion 64 has an outer diameter smaller than that of the piston 62, and a sealing member 66 is fitted on the outer peripheral portion thereof.

  The sealing member 66 is formed in an annular shape and has elasticity, and is disposed on both the outer peripheral portion of the holding portion 64 and the inner peripheral portion of the cylinder main body 60 in a state where the piston 62 is disposed inside the cylinder main body 60. It is elastically pressed and seals between the holding portion 64 and the cylinder body 60. For this reason, when gas is supplied into the cylinder body 60 and the internal pressure of the cylinder body 60 increases, the piston 62 slides toward the upper end side of the cylinder body 60.

  A rack bar 68 as a slide member is formed on the side opposite to the holding portion 64 of the piston 62 (that is, the opening end side of the cylinder body 60). The rack bar 68 has a rectangular bar shape that is long along the opening direction of the cylinder main body 60, and a plurality of rack teeth are formed at regular intervals along the longitudinal direction of the rack bar 68 at one end in the width direction. .

  A gear case 70 as a support member is provided on the side of the leg plate 16 near the opening end of the cylinder body 60, and a cover plate 72 is provided on the opposite side of the gear case 70 via the cylinder body 60. .

  The cover plate 72 is formed in a box shape capable of covering the rack bar 68 protruding from the cylinder body 60 from the side opposite to the leg plate 16 of the cylinder body 60, and at least the rack bar 68 protruding from the opening end of the cylinder body 60. It is formed in a shape that does not interfere with. A plurality of fastening pieces 74 are formed on the outer peripheral portion of the cover plate 72, and these fastening pieces 74 are fastened and fixed to the leg plate 16 with screws 76, whereby the cover plate 72 is fixed to the frame 12. It has a structure.

  Further, the cover plate 72 is formed with a holding portion (not shown) into which the opening end of the cylinder body 60 and the vicinity thereof are fitted, whereby the cover plate 72 is connected to the cylinder body 60. A pinion 90 is disposed between the cover plate 72 and the gear case 70.

  The pinion 90 meshes with the rack teeth at the front end side of the rack bar 68 and is rotatably supported at the other end of the torsion shaft 36 that penetrates the leg plate 16 and the gear case 70. 90 is structured to rotate in the winding direction.

  A clutch 92 is provided on the leg plate 16 side of the pinion 90. Since the clutch 92 is rotatably supported by the torsion shaft 36, the clutch 92 does not rotate even if the torsion shaft 36 rotates. However, the clutch 92 is engaged with the pinion 90, and when the pinion 90 rotates in the winding direction, a part of the clutch 92 is deformed by this rotational force and is connected to the torsion shaft 36.

  A lock mechanism 120 is provided on the side of the leg plate 16. The lock mechanism 120 includes a sensor holder 122. The sensor holder 122 is formed in a concave shape partially opened toward the leg plate 16 side, and a part of the cover plate 72 is located inside the portion opened toward the leg plate 16 side.

  The sensor holder 122 has a cylindrical pin protruding from a predetermined portion of the outer peripheral portion toward the leg plate 16 and is inserted into a hole formed on the leg plate 16 side. The sensor holder 122 is fixed to the leg plate 16 by pressing.

  A sensor cover 124 is provided on the side of the sensor holder 122 opposite to the leg plate 16. The sensor cover 124 has fitting claws and the like formed on the outer periphery and the like, and is fitted to a predetermined portion of the sensor holder 122 and mechanically connected to the sensor holder 122. The sensor cover 124 is formed with a cylindrical bearing portion (not shown), and rotatably supports the other end portion of the torsion shaft 36 penetrating the sensor holder 122.

  A V gear 126 as a second rotating body is provided between the sensor holder 122 and the sensor cover 124. The V gear 126 is a ratchet wheel having ratchet teeth formed on the outer periphery thereof, and is fixed to the torsion shaft 36 coaxially and integrally. Further, a sensor gear 128 as a first rotating body is provided on the sensor cover 124 side of the V gear 126.

  The sensor gear 128 has a main body 130 formed in a substantially disk shape, and the torsion shaft 36 passes through coaxially. The main body 130 of the sensor gear 128 is rotatably supported by the torsion shaft 36, and one end of a return spring 132 is locked to a part of the main body 130. The return spring 132 is a tension coil spring, and the other end is locked to the sensor cover 124. When the sensor gear 128 rotates around the torsion shaft 36 in the pull-out direction, the sensor gear 128 is biased in the winding direction. .

  Further, a W pawl 134 as a rotational force transmitting means is provided on the sensor gear 128 side of the V gear 126. The W pawl 134 is pivotally supported by the V gear 126 so as to be rotatable around an axis parallel to the spool 24 at a position eccentric with respect to the axis of the spool 24.

  By rotating the W pawl 134 in the winding direction with respect to the V gear 126, the W pawl 134 is displaced to the outside of the rotation radius of the V gear 126 with respect to the V gear 126. It engages with an engaging portion (not shown) formed in When the W pawl 134 is engaged with the engaging portion of the main body 130, the rotational force in the pulling direction of the V gear 126 can be transmitted to the sensor gear 128 via the W pawl 134, and the sensor gear 128 is pulled out together with the V gear 126. Can be rotated in the direction.

  Further, a sensor spring 136 is provided on the side of the W pawl 134. The sensor spring 136 is a compression coil spring, and one end thereof is fixed to the W pawl 134. The other end of the sensor spring 136 is fixed to the V gear 126 and urges the W pawl 134 around the torsion shaft 36 in the winding direction with respect to the V gear 126.

  A W mass 138 is provided on the opposite side of the W pawl 134 from the V gear 126. The W mass 138 is a plate material having a thickness direction along the axial direction of the torsion shaft 36, and is attached as a weight (weight) of the W pawl 134.

  On the other hand, an engagement claw 140 is provided on the main body 130 of the sensor gear 128. The engaging claw 140 is pivotally supported on the main body 130 so as to be rotatable about an axis parallel (in the same direction) as the axial direction of the torsion shaft 36.

  Below the engagement claw 140, an acceleration sensor 142 is provided as acceleration detection means. Corresponding to the acceleration sensor 142, the sensor holder 122 is formed with a box-shaped accommodation portion 144 that opens toward the sensor cover 124, and at least a part of the acceleration sensor 142 is accommodated in the accommodation portion 144.

  The acceleration sensor 142 includes a base 146. The base 146 is formed in a flat plate shape in the thickness direction in the vertical direction as a whole. A curved surface that opens upward is formed on the upper end surface of the base 146, and a hard ball 148 as an inertial body is disposed on the curved surface. A sensor claw 150 is provided above the hard ball 148.

  The sensor claw 150 is pivotally supported on the upper end of the vertical wall 152 erected upward from a part of the outer periphery of the base 146, and the hard ball 148 rolls on the curved surface of the base 146. Then, the sensor claw 150 is pushed up. The sensor claw 150 is pushed up by the hard ball 148 to engage with the engagement claw 140 and rotate the engagement claw 140.

  The V gear 126 is positioned on the rotation direction side of the engagement claw 140 rotated by the engagement of the sensor claw 150, and thereby the engagement claw 140 meshes with the V gear 126. When the engaging claw 140 meshes with the V gear 126, the rotational force in the pulling direction of the V gear 126 is transmitted to the engaging claw 140 and thus the sensor gear 128, and the sensor gear 128 resists the biasing force of the return spring 132 in the pulling direction. Rotate.

  The V gear 126 is positioned on the rotation direction side of the engagement claw 140 rotated by the engagement of the sensor claw 150, and thereby the engagement claw 140 meshes with the V gear 126. When the engaging claw 140 meshes with the V gear 126, the rotational force in the pulling direction of the V gear 126 is transmitted to the engaging claw 140 and thus the sensor gear 128, and the sensor gear 128 resists the biasing force of the return spring 132 in the pulling direction. Rotate.

  On the other hand, the lock mechanism 120 includes a lock pawl 160 that constitutes a specific member as claimed in the claims as a lock means. The lock pawl 160 includes a shaft 162. The shaft 162 is axially parallel to the axial direction of the spool 24 (same direction), and one end of the shaft 162 is pivotally supported by a bearing hole (not shown) formed in the leg plate 18. Yes.

  The other axial end portion of the shaft 162 is pivotally supported by a bearing hole 164 formed in the gear case 70.

  Here, as shown in FIG. 3, the gear case 70 is formed with an engaging pin 182 as a connecting means protruding toward the leg plate 16.

  When the gear case 70 is viewed along the axial direction of the spool 24, the engagement pin 182 is formed to be positioned on the side of the slide track of the rack bar 68 of the pretensioner 50.

  Further, the gear case 70 is formed with an engaging pin 182 as a connecting means protruding toward the leg plate 16. As shown in FIG. 2, the engagement pin 182 is formed to be located on the opposite side of the engagement pin 182 across the slide locus S of the rack bar 68 of the pretensioner 50.

  Further, the engagement pin 182 is provided to be displaced to the upper side of the frame 12 than the engagement pin 182, that is, to the sliding direction side of the rack bar 68 when the piston 62 slides toward the upper end side of the cylinder body 60. ing.

  Engagement holes 186 and 188 are formed in the leg plate 16 corresponding to the engagement pins 182 and 184, respectively. The engagement pins 182 are fitted into the engagement holes 186 and engaged with the engagement holes 188. The gear case 70 is fixed to the leg plate 16 by fitting the pins 182.

  As shown in FIG. 3, a pawl portion 166 is formed on the other axial end side of the shaft 162 whose other end is supported by the gear case 70 as described above. The pawl portion 166 is a plate-like member in the thickness direction along the axial direction of the shaft 162, and external ratchet teeth are formed on a part of the outer periphery thereof.

  A lock base 170 as a rotating body is provided on the side of the pawl portion 166 along the rotational radius direction of the shaft 162. The lock base 170 includes a fitting insertion portion 172. The fitting insertion portion 172 is formed in a cylindrical shape, and is fitted into the other end portion of the through hole 28 of the spool 24 so as to be rotatable coaxially with the spool 24.

  The insertion portion 172 and thus the lock base 170 are coaxially penetrated with the torsion shaft 36 being prevented from rotating, and rotate coaxially and integrally with the torsion shaft 36.

  A ratchet portion 174 is integrally formed on the leg plate 16 side of the fitting insertion portion 172. The ratchet portion 174 is formed coaxially with the fitting insertion portion 172, and ratchet teeth are intermittently formed on the outer peripheral portion thereof.

  In the lock pawl 160, the ratchet teeth of the pawl portion 166 mesh with the ratchet teeth of the ratchet portion 174 as the shaft 162 rotates in the winding direction. In the meshed state of the pawl portion 166 and the ratchet portion 174, the rotation of the ratchet portion 174 and thus the lock base 170 in the pull-out direction is restricted.

  Corresponding to the pawl portion 166, the main body 130 of the sensor gear 128 is provided with a pressing portion 168 as a connecting member. The pressing portion 168 is formed integrally with the engaging claw 140. When the engaging claw 140 is rotated by being pushed up by the hard ball 148, the pressing portion 168 rotates integrally to press the pawl portion 166, and locks. The pawl 160 is rotated in the winding direction.

(Characteristic configuration of the present embodiment)
Next, a characteristic configuration of a main part of the webbing take-up device 10 will be described.

  FIG. 1 is an exploded perspective view in which the configuration of the main part of the webbing take-up device 10 is enlarged. FIG. 2 is a cross-sectional view in which the configuration of the main part of the webbing take-up device 10 is enlarged. .

  As shown in these drawings, an insertion hole 192 is formed in the spool 24 described above. The insertion hole 192 is formed parallel to the axial center of the spool 24 at a position eccentric to the outer side in the rotational radial direction of the spool 24 with respect to the insertion hole 26.

  A guide groove 194 is formed at the end of the spool 24 on the lock base 170 side. The guide groove 194 has a circular shape centered on the axial center of the spool 24 and opens toward the lock base 170 along the axial direction of the spool 24. The opening width dimension of the guide groove 194 along the rotational radius direction of the spool 24 is substantially equal to the inner diameter dimension of the insertion hole 192, and the insertion hole 192 opens at the bottom of the guide groove 194.

  A wire 196 whose outer diameter is slightly smaller than the inner diameter of the insertion hole 192 is disposed in the insertion hole 192 and the guide groove 194. The wire 196 has a straight rod-like portion 198.

  The rod-shaped portion 198 is inserted through the insertion hole 192. At the end of the rod-shaped portion 198 on the guide groove 194 side, the wire 196 is bent in the rotational radius direction of the spool 24, and a curved portion 200 is formed continuously from the bent portion.

  The curved portion 200 has a radius of curvature substantially equal to the radius of curvature of the guide groove 194 and extends from the bent portion in the winding direction inside the guide groove 194. A wire 196 is bent toward the lock base 170 in parallel with the axial center of the spool 24 at the end of the bending portion 200 opposite to the rod-shaped portion 198.

  The distal end side of the wire 196 with respect to the bent portion is a rod-like portion 202, and the extension dimension from the bent portion is the dimension of the insertion hole 204 and the dimension of the circular hole 206, which will be described later, along the rotation axis direction of the lock base 170. Is the same or shorter than the sum of

  An insertion hole 204 is formed in the lock base 170 corresponding to the rod-like portion 202. The insertion hole 204 is a hole with a bottom whose inner diameter is sufficiently larger than the outer diameter of the rod-shaped portion 202, and opens at the end surface of the lock base 170 opposite to the spool 24.

  Further, a circular hole 206 is formed in the lock base 170. The circular hole 206 has a smaller inner diameter than the insertion hole 204 and is formed coaxially with the insertion hole 204. One end of the circular hole 206 is opened at the end surface of the lock base 170 on the spool 24 side and is connected to the guide groove 194.

  Further, the other end of the circular hole 206 is opened at the bottom of the insertion hole 204. The rod-like portion 202 is inserted into the circular hole 206, and the distal end side projects into the insertion hole 204. A male screw is formed on the outer peripheral portion of the portion protruding into the insertion hole 204 of the rod-like portion 202, and a female screw formed on the inner peripheral portion of the ring-shaped stopper 208 constituting the holding means is screwed together as a restricting means. A stopper 208 is attached to the tip of the rod-like portion 202.

  The outer diameter of the stopper 208 is smaller than the inner diameter of the insertion hole 204 and sufficiently larger than the inner diameter of the circular hole 206. The bottom of the insertion hole 204 facing the stopper 208 along the opening direction of the circular hole 206 and the insertion hole 204 is a restriction wall 210, and the surface of the restriction wall 210 on the stopper 208 side is a contact surface 212. The contact surface 212 of the regulation wall 210 is in contact with the stopper 208 from the spool 24 side. Further, the thickness dimension of the stopper 208 (the dimension in the direction along the rotation axis of the lock base 170) is the depth dimension of the insertion hole 204 from the restriction wall 210 to the end surface of the lock base 170 opposite to the spool 24. Same or shorter.

<Operation and effect of the present embodiment>
(Basic actions and effects in operation)
In the webbing take-up device 10, when the webbing belt 30 wound on the spool 24 is pulled toward the tip end against the urging force of the spiral spring 40, the spool 24 is pulled out in the pulling direction while the webbing belt 30 is pulled out. Rotate. The webbing belt 30 pulled out in this way is hung around the occupant's body, and, for example, the tongue plate provided at the intermediate portion in the longitudinal direction of the webbing belt 30 is held by the buckle device provided at the side of the vehicle seat. Thus, the webbing belt 30 is attached to the occupant's body, and the occupant's body is restrained by the webbing belt 30.

  When the vehicle is suddenly decelerated with the webbing belt 30 attached, the hard ball 148 rolls and the sensor ball 150 is pushed up by the hard ball 148. The sensor claw 150 pushed up in this way is engaged with the engagement claw 140 of the sensor gear 128 to rotate the engagement claw 140. The engaging claw 140 rotates and meshes with the V gear 126.

  On the other hand, when the occupant's body is inertially moved substantially forward of the vehicle while the vehicle is rapidly decelerating, the webbing belt 30 is rapidly pulled out by the occupant's body. In this way, when the webbing belt 30 is pulled out rapidly, the spool 24, and thus the V gear 126, rotates rapidly in the pulling-out direction.

  When the V gear 126 suddenly rotates in the pulling direction, the W pawl 134 tries to rotate in the pulling direction together with the V gear 126, but the W pawl 134 is provided with the W mass 138, so that it does not rotate due to inertia. Try to stay in that position. As a result, a relative movement against the urging force of the sensor spring 136 occurs between the V gear 126 rotating in the pull-out direction and the W pawl 134 to be stopped.

  Thus, the W pawl 134 is engaged with the sensor gear 128 by the relative movement of the W pawl 134 with respect to the V gear 126. When the W pawl 134 is engaged with the sensor gear 128, the sensor gear 128 is connected to the V gear 126 via the W pawl 134.

  As described above, when the webbing belt 30 is pulled out by the occupant's body and the spool 24 rotates in the pull-out direction in a state where the sensor gear 128 is connected to the V-gear 126 via the engaging claw 140 or the W pawl 134, the V-gear is rotated. 126 and the sensor gear 128 rotate in the pull-out direction. When the sensor gear 128 rotates in a pulling direction at a constant angle against the urging force of the return spring 132, the pressing portion 168 integrated with the engaging claw 140 presses the pawl portion 166 of the lock pawl 160, and the pawl portion around the shaft 162. 166 is rotated.

  When the pawl portion 166 rotates around the shaft 162 in this way, the pawl portion 166 meshes with the ratchet portion 174 of the lock base 170, and the rotation of the lock base 170 and thus the spool 24 in the pulling direction is restricted. As a result, the body of the occupant who is about to move inertially toward the front side of the vehicle can be reliably restrained and held by the webbing belt 30.

  Further, in the state where the rotation of the lock base 170 in the pull-out direction is restricted by the pawl portion 166, the body of the occupant trying to move substantially to the front side of the vehicle pulls the webbing belt 30 with a force of a predetermined magnitude or more. When the pulling force is applied to the spool 24 in a pulling direction, the spool 24 tries to rotate the end portion on the leg plate 18 side of the torsion shaft 36 in the pulling direction.

  However, the torsion shaft 36 is fitted and inserted in a state in which the torsion shaft 36 is locked to the lock base 170 at the end on the leg plate 16 side. As described above, since the lock base 170 is restricted from rotating in the pull-out direction by the pawl portion 166, even if a rotational force in the pull-out direction is applied to the end of the torsion shaft 36 on the leg plate 18 side, the torsion shaft The end of 36 on the leg plate 16 side cannot rotate in the pull-out direction.

  In this state, if the rotational force in the pull-out direction applied to the end of the torsion shaft 36 on the leg plate 18 side exceeds the mechanical strength of the torsion shaft 36, the torsion shaft 36 is twisted, and the spool 24 is correspondingly twisted. Can rotate in the pull-out direction.

  Further, when the spool 24 rotates in the drawing direction while the rotation of the lock base 170 in the drawing direction is restricted in this way, the circular hole 206 moves away from the insertion hole 192 in the winding direction. Since the rod-shaped portion 202 of the wire 196 passes through the circular hole 206, when the circular hole 206 tries to move away from the insertion hole 192 in the winding direction, the rod-shaped portion 202 comes out from the circular hole 206 toward the guide groove 194. Try to.

  However, a stopper 208 is provided on the rod-shaped portion 202 of the wire 196 that has entered the insertion hole 204, and when the rod-shaped portion 202 tries to escape from the circular hole 206 to the guide groove 194 side, the end surface of the stopper 208 on the spool 24 side. Is interfered by the restriction wall 210, and the movement of the stopper 208, and consequently the rod-like portion 202, toward the spool 24 is restricted. For this reason, the rod-shaped part 202 moves away from the insertion hole 192 together with the circular hole 206.

  As a result, the rod-shaped portion 198 is forcibly pulled out of the wire 196 from the insertion hole 192, and the further pulled-out rod-shaped portion 198 is squeezed by the edge of the insertion hole 192 at the bottom of the guide groove 194. The guide groove 194 enters while deforming along the shape.

  The load applied to the torsional deformation of the torsion shaft 36 and the deformation of the wire 196 due to the ironing acts on the occupant via the webbing belt 30 as a force limiter load, and the spool 24 is applied to the lock base 170. On the other hand, the webbing belt 30 is pulled out by being rotated in the pulling-out direction, and energy is absorbed.

  Further, when either the breakage of the torsion shaft 36 due to excessive twisting of the torsion shaft 36 or the completion of the ironing of the wire 196 due to the rod-shaped portion 198 completely coming out of the insertion hole 192 occurs as described above. The load decreases. As described above, the webbing retractor 10 can change (decrease) the force limiter load while the occupant's body is pulling the webbing belt 30 with a force of a predetermined magnitude or more in the vehicle sudden deceleration state. .

(Characteristic action and effect of this embodiment)
By the way, as described above, the extension dimension of the rod-shaped part 202 from the bent part on the bending part 200 side is the sum of the dimension of the circular hole 206 along the rotation axis direction of the lock base 170 and the dimension of the insertion hole 204. Same or shorter than before. Therefore, the tip of the rod-shaped portion 202 does not protrude from the end surface of the lock base 170 opposite to the spool 24.

  Further, the thickness of the stopper 208 is equal to or shorter than the depth of the insertion hole 204 from the regulation wall 210 to the end surface of the lock base 170 opposite to the spool 24. Therefore, the stopper 208 does not protrude from the end surface of the lock base 170 opposite to the spool 24.

  Thus, in this webbing take-up device 10, since the wire 196 and the stopper 208 do not protrude from the end surface of the lock base 170 opposite to the spool 24, the end surface of the lock base 170 opposite to the spool 24. Even if another member such as the gear case 70 is arranged on the side of the wire 196, the wire 196 and the stopper 208 do not interfere with other members such as the gear case 70.

  For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of Second Embodiment>
Next, other embodiments of the present invention will be described. In describing each of the following embodiments, the same parts as those in the previous embodiment are basically the same as those in the embodiment described above including the first embodiment. Reference numerals are assigned and description thereof is omitted.

  FIG. 4 shows a configuration of a main part of a webbing take-up device 220 according to a second embodiment of the present invention from a cross-sectional view corresponding to FIG.

  As shown in this figure, in this webbing take-up device 220, a rod-shaped portion 222 is formed on the wire 196 instead of the rod-shaped portion 202.

  The rod-like portion 222 extends from a bent portion that is bent toward the lock base 170 along the axial direction of the spool 24 from the curved portion 200, and is the same as the rod-like portion 222 in this respect. However, the rod-shaped portion 222 is not formed with a male screw, and an annular groove 224 is formed.

  Further, the webbing take-up device 220 includes a stopper 226 as a flange instead of the stopper 208. The stopper 226 includes a disk portion 228 that can be inserted into the insertion hole 204. The disc portion 228 is formed on a disc whose outer diameter is smaller than the inner diameter of the insertion hole 204 and sufficiently larger than the inner diameter of the circular hole 206. Furthermore, the thickness dimension (dimension along the axial direction) of the disc portion 228 is set to be equal to or less than the depth dimension of the insertion hole 204 from the opening end of the insertion hole 204 to the contact surface 212.

  A cylindrical portion 230 is formed coaxially with respect to the disc portion 228 from one axial end portion of the disc portion 228. The cylindrical portion 230 has an outer diameter dimension smaller than the inner diameter dimension of the circular hole 206 and larger than the outer diameter dimension of the rod-shaped portion 222, and is formed in a bottomed cylindrical shape with the disc portion 228 at the bottom.

  Further, a protrusion 232 is formed from the inner peripheral portion of the cylindrical portion 230 toward the radially inner side of the cylindrical portion 230, and when the tip of the rod-shaped portion 222 is press-fitted from the opening end of the cylindrical portion 230, the groove 224 is formed. The protrusion 232 enters into the cylindrical portion 230, and the cylindrical portion 230 is inserted into the circular hole 206 in this state.

<Operation and Effect of Second Embodiment>
In the present embodiment configured as described above, as in the first embodiment, the spool 24 rotates in the pull-out direction while the rotation of the lock base 170 in the pull-out direction is restricted by the pawl portion 166. When the rod-like portion 222 tries to come out from the circular hole 206 to the guide groove 194 side, the inner wall of the groove 224 presses the protrusion 232 toward the guide groove 194 side and tries to move the stopper 226 to the guide groove 194 side.

  However, in this state, the disc portion 228 is interfered with the contact surface 212 of the restriction wall 210 and the movement of the stopper 226 toward the spool 24 is restricted. Thereby, the movement of the rod-shaped part 222 to the guide groove 194 side is restricted. As a result, as in the first embodiment, the rod-shaped portion 198 of the wire 196 is deformed while being pulled out from the insertion hole 192 as the spool 24 rotates in the pull-out direction.

  On the other hand, in the present embodiment, as described above, the thickness dimension of the disc portion 228 of the stopper 226 is set to be equal to or less than the depth dimension of the insertion hole 204 from the opening end of the insertion hole 204 to the contact surface 212. Yes. Therefore, as shown in FIG. 4, when the disc portion 228 is disposed in the insertion hole 204, the surface of the disc portion 228 opposite to the cylindrical portion 230 does not protrude from the opening end of the insertion hole 204. .

  Thus, even if another member such as the gear case 70 is disposed on the side of the end surface of the lock base 170 opposite to the spool 24, the wire 196 and the stopper 226 may interfere with other members such as the gear case 70. Absent. For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of Third Embodiment>
Next, a third embodiment of the present invention will be described.

  FIG. 5 is an exploded perspective view showing the configuration of the main part of the webbing take-up device 240 according to the present embodiment.

  As shown in this figure, in the present webbing take-up device 240, the wire 196 is formed with a rod-shaped portion 242 instead of the rod-shaped portion 202.

  The rod-shaped portion 242 extends from a bent portion that is bent toward the lock base 170 along the axial direction of the spool 24 from the curved portion 200, and is the same as the rod-shaped portion 202 in this respect.

  However, the rod-shaped portion 242 is not formed with a male screw, and instead, a flange 244 is formed at the tip of the rod-shaped portion 242. The outer diameter of the flange 244 is larger than the outer diameter of the rod-shaped portion 242 other than the flange 244 and the inner diameter of the circular hole 206, and smaller than the inner diameter of the insertion hole 204. Further, the thickness dimension (dimension along the axial direction) of the flange 244 is set to be equal to or less than the depth dimension of the insertion hole 204 from the opening end of the insertion hole 204 to the contact surface 212.

  On the other hand, an insertion hole 246 whose inner diameter dimension is larger than the outer diameter dimension of the flange 244 is formed on the lock base 170 winding side with respect to the circular hole 206 and the insertion hole 204.

  The insertion holes 246 are parallel to the circular holes 206 and the insertion holes 204 and open at both end surfaces of the lock base 170. Further, the insertion hole 246 is connected to the insertion hole 204 and the circular hole 206 along the circumferential direction of the lock base 170, and the rod-like portion 242 can pass between the circular hole 206 and the insertion hole 246. Between the holes 246, the flange 244 is wide enough to pass.

<Operation and Effect of Third Embodiment>
In the present embodiment, in the wire 196, the flange 244 of the rod-like portion 242 is inserted from the spool 24 side of the insertion hole 246. In a state where the flange 244 is positioned closer to the opening end side of the insertion hole 204 than the contact surface 212, the rod-like portion 242 is moved to the drawing direction side. As a result, the flange 244 faces the contact surface 212.

  In this state, similarly to the first embodiment, the rotation of the lock base 170 in the pull-out direction is restricted by the pawl portion 166 and the spool 24 rotates in the pull-out direction, so that the rod-shaped portion 242 has the circular hole 206. If the contact surface 212 comes into contact with the flange 244 and interferes with it, the movement of the flange 244 and consequently the rod-shaped portion 242 toward the guide groove 194 is restricted.

  As a result, as in the first embodiment, the rod-shaped portion 198 of the wire 196 is deformed while being pulled out from the insertion hole 192 as the spool 24 rotates in the pull-out direction.

  On the other hand, in the present embodiment, as described above, the thickness dimension of the flange 244 is set to be equal to or less than the depth dimension of the insertion hole 204 from the opening end of the insertion hole 204 to the contact surface 212. Therefore, in a state where the flange 244 is disposed in the insertion hole 204, the surface of the flange 244 opposite to the cylindrical portion 230 does not protrude from the opening end of the insertion hole 204.

  Thus, even if another member such as the gear case 70 is disposed on the side of the end surface of the lock base 170 opposite to the spool 24, the wire 196 and the flange 244 may interfere with other members such as the gear case 70. Absent. For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described.

  FIG. 6 is an exploded perspective view showing the configuration of the main part of the webbing take-up device 260 according to the present embodiment.

  As shown in this figure, in the present webbing take-up device 260, the wire 196 is formed with a plate-like portion 262 instead of the rod-like portion 202, and a flange 244 is formed at the tip thereof. The plate-like portion 262 extends from a bent portion that is bent from the curved portion 200 toward the lock base 170 along the axial direction of the spool 24 in the same manner as the rod-like portion 202. The plate-like portion 262 is formed in a plate shape in the thickness direction toward one side in the radial direction of the flange 244, and the thickness dimension thereof is sufficiently shorter than the outer diameter dimension of the flange 244. It is shorter than the inner diameter.

<Operation and Effect of Fourth Embodiment>
In the present embodiment, the flange 244 of the wire 196 is inserted from the spool 24 side of the insertion hole 246. With the flange 244 positioned closer to the opening end side of the insertion hole 204 than the contact surface 212, the plate-like portion 262 is moved to the drawing direction side.

  As a result, the flange 244 faces the contact surface 212. For this reason, similarly to the third embodiment, the pawl portion 166 restricts the rotation of the lock base 170 in the pull-out direction, and the spool 24 rotates in the pull-out direction, so that the plate-like portion 262 is removed from the circular hole 206. When trying to escape to the guide groove 194 side, the contact surface 212 contacts and interferes with the flange 244, thereby restricting the movement of the flange 244 and eventually the plate-like portion 262 to the guide groove 194 side.

  As a result, as in the first embodiment, the rod-shaped portion 198 of the wire 196 is deformed while being pulled out from the insertion hole 192 as the spool 24 rotates in the pull-out direction.

  On the other hand, in the present embodiment, as in the third embodiment, the thickness dimension of the flange 244 is set to be equal to or less than the depth dimension of the insertion hole 204 from the opening end of the insertion hole 204 to the contact surface 212. Yes. Therefore, in a state where the flange 244 is disposed in the insertion hole 204, the surface of the flange 244 opposite to the cylindrical portion 230 does not protrude from the opening end of the insertion hole 204.

  Thus, even if another member such as the gear case 70 is disposed on the side of the end surface of the lock base 170 opposite to the spool 24, the wire 196 and the flange 244 may interfere with other members such as the gear case 70. Absent. For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of Fifth Embodiment>
Next, a fifth embodiment of the present invention will be described.

  FIG. 7 is an exploded perspective view showing a configuration of a main part of the webbing take-up device 270 according to the present embodiment.

  As shown in these drawings, in the present webbing take-up device 270, a rectangular hole 272 as an insertion hole is formed in the lock base 170. The rectangular hole 272 is opened at the end surface of the lock base 170 opposite to the spool 24, and the shape of the opening is substantially a pair of sides facing each other along the circumferential direction of the lock base 170 and the lock base 170. It is formed in a rectangular shape having a pair of sides facing each other along the radial direction.

  The lock base 170 is formed with an oval hole 274 whose opening shape is substantially oval. The longitudinal direction of the oval hole 274 is generally along the circumferential direction of the lock base 170, and the longitudinal dimension thereof is longer than the opening dimension of the rectangular hole 272 along the same direction, and the rectangular hole 272 along this direction. The inner peripheral portions on both sides in the longitudinal direction of the oval hole 274 are located outside the inner peripheral portion.

  In addition, the opening size of the oval hole 274 along the radial direction of the lock base 170 is slightly larger than the outer diameter size of the rod-shaped portion 202 of the wire 196, and is further larger than the opening size of the rectangular hole 272 along the same direction. short. The inner peripheral portion of the rectangular hole 272 is located outside the inner peripheral portions on both sides in the longitudinal direction of the oval hole 274 along this direction.

  Further, a pair of bottom walls 276 are formed as restricting means on the rectangular hole 272 side of the oval hole 274. The bottom wall 276 is formed so as to face each other substantially along the radial direction of the lock base 170, and a surface facing the opposite side of the spool 24 is a contact surface 278.

  Further, a gap 280 is formed between the pair of bottom walls 276 and the inner peripheral portion of the rectangular hole 272 located on the side of the lock base 170 on the winding direction side along the circumferential direction.

  On the other hand, a neck portion 282 is formed on the rod-shaped portion 202 of the wire 196. The neck portion 282 is generally formed in a rectangular bar shape in the longitudinal direction along the radial direction of the lock base 170, and the longitudinal dimension thereof is formed to be approximately the outer diameter dimension of the rod-shaped portion 202, and generally the circumference of the lock base 170. The width dimension of the neck 282 along the direction is slightly smaller than the gap 280 described above.

  Further, the projecting dimension of the neck 282 from the rod-shaped part 202 is set to the thickness dimension of the bottom wall 276.

  A flange 284 is formed on the opposite side of the neck 282 from the rod-like portion 202. Unlike the flange 244, the flange 284 is formed in a rectangular bar shape that is long along the longitudinal direction of the neck 282. The longitudinal dimension of the flange 284 is sufficiently longer than the neck portion 282, and both longitudinal ends thereof protrude outward from both longitudinal ends of the neck portion 282.

  Further, the thickness dimension of the flange 284 along the axial direction of the rod-shaped portion 202 is set to be equal to or less than the depth dimension of the rectangular hole 272 from the opening end of the rectangular hole 272 opposite to the spool 24 to the contact surface 278. ing.

<Operation and Effect of Fifth Embodiment>
In this embodiment, the flange 284 of the wire 196 passes through the gap 280 side of the oval hole 274 and is inserted into the rectangular hole 272. In a state where the flange 284 is positioned on the opening end side of the rectangular hole 272 with respect to the contact surface 278, the neck portion 282 and the flange 284 are moved in the pull-out direction side.

  As a result, the flange 284 faces the contact surface 278. Therefore, as in the third embodiment, the pawl portion 166 restricts the rotation of the lock base 170 in the pull-out direction, and the spool 24 rotates in the pull-out direction, so that the rod-shaped portion 202 is formed in the oval hole 274. If the contact surface 278 comes into contact with the flange 284 and interferes with it, the movement of the flange 284 toward the guide groove 194 is restricted.

  As a result, as in the first embodiment, the rod-shaped portion 198 of the wire 196 is deformed while being pulled out from the insertion hole 192 as the spool 24 rotates in the pull-out direction.

  On the other hand, in the present embodiment, as in the third embodiment, the thickness dimension of the flange 284 is set to be equal to or less than the depth dimension of the rectangular hole 272 from the opening end of the rectangular hole 272 to the contact surface 278. Yes. Therefore, when the flange 284 is disposed in the rectangular hole 272, the surface of the flange 284 opposite to the neck 282 does not protrude from the opening end of the rectangular hole 272.

  Thereby, even if other members such as the gear case 70 are arranged on the side of the end surface of the lock base 170 opposite to the spool 24, the wire 196 and the flange 284 may interfere with other members such as the gear case 70. Absent. For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of Sixth Embodiment>
Next, a sixth embodiment of the present invention will be described.

  FIG. 8 is an exploded perspective view showing a configuration of a main part of the webbing take-up device 290 according to the present embodiment.

  As shown in these drawings, the webbing take-up device 290 has basically the same configuration as the webbing take-up device 240 according to the third embodiment. However, the webbing take-up device 290 is different in configuration from the webbing take-up device 240 according to the third embodiment in that a stopper 292 is provided.

  The stopper 292 is formed in a plate shape corresponding to the communication hole between the insertion hole 246 and the insertion hole 204 and the opening shape of the insertion hole 246, and the stopper 292 is arranged by disposing the stopper 292 inside the insertion hole 204. The insertion hole 204 can be closed by 292.

  Further, the thickness dimension of the stopper 292 is set to be equal to or smaller than the dimension between both opening ends of the insertion hole 246, and the end surface of the stopper 292 opposite to the spool 24 in a state where the stopper 292 is disposed inside the insertion hole 204. Has a structure that does not protrude from the lock base 170.

<Operation and Effect of Sixth Embodiment>
In this embodiment, it is possible to prevent the rod-shaped portion 202 and the flange 244 of the wire 196 from moving to the insertion hole 204 side by closing the insertion hole 246 with the stopper 292 as described above.

  In addition, as described above, the end surface of the stopper 292 opposite to the spool 24 does not protrude from the lock base 170, so that another member such as the gear case 70 is located on the side of the end surface of the lock base 170 opposite to the spool 24. The stopper 292 does not interfere with other members such as the gear case 70 even if the above is disposed.

  For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of the seventh embodiment>
Next, a seventh embodiment of the present invention will be described.

  FIG. 9 shows a configuration of a main part of the webbing take-up device 300 according to the present embodiment in a sectional view in which the spool 24 and the lock base 170 are partially broken along the guide groove 194.

  As shown in this figure, in the webbing take-up device 300, a hole 302 is formed in the lock base 170. The holes 302 are open at both ends of the ratchet portion of the lock base 170.

  Furthermore, a bottom wall 304 extends from the inner peripheral portion of the hole 302 on the winding direction side, and the spool 24 side of the hole 302 is closed at a portion where the bottom wall 304 is formed. Further, the depth dimension from the surface of the bottom wall 304 opposite to the spool 24 to the opening end of the hole 302 opposite to the spool 24 is set to be equal to or smaller than the outer diameter dimension of the wire 196.

  On the other hand, in the present embodiment, a hook-shaped portion 306 is formed instead of the rod-shaped portion 202 of the wire 196. Like the rod-shaped portion 202, the hook-shaped portion 306 extends from the bent portion from the curved portion 200 to the opposite side of the spool 24. Furthermore, the hook-shaped portion 306 is bent toward the winding direction at the intermediate portion. As shown in FIG. 9, the hook-shaped portion 306 is accommodated in the hole 302.

  Of the opening edge of the hole 302 on the spool 24 side, the part facing the bottom wall 304 is an interference part 308 as interference means, and the bending part 200 and the hook-like part 306 of the wire 196 The bent part is in contact with each other.

<Operation and Effect of Seventh Embodiment>
In the present embodiment, the pawl portion 166 restricts the rotation of the lock base 170 in the pull-out direction, and the spool 24 rotates in the pull-out direction, so that the hook-shaped portion 306 is pulled out from the hole 302 toward the guide groove 194 side. And

  However, in this state, since the interference portion 308 is in contact with the bent portion between the hook-shaped portion 306 and the bending portion 200, friction occurs between the bent portion and the interference portion 308. This friction prevents or effectively suppresses the hook-like portion 306 from coming out of the hole portion 302.

  Thus, the rod-shaped portion 306 of the wire 196 is pulled out from the insertion hole 192 as the spool 24 rotates in the pull-out direction by preventing or effectively suppressing the hook-shaped portion 306 from coming out of the hole 302. While deforming.

  On the other hand, in the present embodiment, as described above, the depth dimension from the surface of the bottom wall 304 opposite to the spool 24 to the opening end of the hole 302 opposite to the spool 24 is outside the wire 196. It is set below the diameter dimension. Furthermore, the tip side of the bent portion 306 is directed toward the winding direction.

  For this reason, the front end side of the bent portion of the hook-shaped portion 306 does not protrude from the end surface of the lock base 170 opposite to the spool 24. Therefore, even if another member such as the gear case 70 is disposed on the side of the end surface opposite to the spool 24 of the lock base 170, the wire 196 does not interfere with other members such as the gear case 70.

  For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of Eighth Embodiment>
Next, an eighth embodiment of the present invention will be described.

  FIG. 10 shows a configuration of a main part of the webbing take-up device 320 according to the present embodiment by a sectional view in which the spool 24 and the lock base 170 are partially broken along the guide groove 194.

  As shown in this figure, in the present webbing take-up device 320, a bottomed circular hole 322 is formed in the bottom wall 304. The circular hole 322 opens at the end surface of the bottom wall 304 opposite to the spool 24.

  Corresponding to this circular hole 322, the tip of the hook-shaped portion 306 is bent toward the spool 24 and enters the circular hole 322. Of the inner peripheral portion of the circular hole 322, a portion facing the tip of the flange-shaped portion 306 that has entered the circular hole 322 in the pull-out direction is an interference portion 326.

<Operation and Effect of Eighth Embodiment>
In the present embodiment, the pawl portion 166 restricts the rotation of the lock base 170 in the pull-out direction, and the spool 24 rotates in the pull-out direction, so that the hook-shaped portion 306 is pulled out from the hole 302 toward the guide groove 194 side. In this case, the interference portion 308 not only interferes with the bent portion of the hook-like portion 306 and the bending portion 200, but also the interference portion 326 abuts on the tip of the hook-like portion 306, and the tip of the hook-like portion 306 is Displacement in the pull-out direction is restricted.

  This also prevents or effectively suppresses the hook-like portion 306 from coming out of the hole portion 302.

  In addition, since the configuration of the webbing take-up device 300 according to the seventh embodiment is basically the same except that the tip of the bowl-shaped portion 306 enters the portion where the circular hole 322 is formed, The same effect as the webbing take-up device 300 according to the seventh embodiment can be basically obtained, and the same effect can be obtained.

<Configuration of the ninth embodiment>
Next, a ninth embodiment of the present invention will be described.

  FIG. 11 shows a configuration of a main part of the webbing take-up device 340 according to the present embodiment in a sectional view in which the spool 24 and the lock base 170 are partially broken along the guide groove 194.

  As shown in this figure, in the present webbing take-up device 340, the hole 302 is formed in the lock base 170, but the bottom wall 304 is not formed. Further, in the present webbing take-up device 340, the hook-like portion 306 is not formed on the wire 196, but a hook-like portion 342 is formed instead.

  The hook-shaped portion 342 extends from the bent portion of the curved portion 200 toward the side opposite to the spool 24, and is further bent from the intermediate portion toward the drawing direction side. The front end side of the bent portion of the hook-shaped portion 342 is at the same position as the opening end of the hole 302 on the side opposite to the spool 24 or closer to the spool 24 side than the opening end on the side opposite to the spool 24. positioned.

  Further, between the bent portion at the hook-shaped portion 342 and the bent portion between the curved portion 200 and the hook-shaped portion 342, the outer peripheral portion of the hook-shaped portion 306 is the inner peripheral portion of the hole 302 on the winding direction side. The inner peripheral portion of the hole 302 on the winding direction side is an interference portion 344.

<Operation and Effect of Ninth Embodiment>
In the present embodiment, the rotation of the lock base 170 in the pull-out direction is restricted by the pawl portion 166, and the spool 24 rotates in the pull-out direction, whereby relative rotation between the lock base 170 and the spool 24 occurs. When this occurs, the inner peripheral portion of the inner peripheral portion of the insertion hole 204 that faces the interference portion 344 presses the tip of the hook-shaped portion 342 toward the winding direction. With this pressing force, the hook-shaped portion 342 is deformed while being displaced in the winding direction and tends to come out to the guide groove 194 side.

  However, since the interference part 344 is in contact with the hook-shaped part 342 on the winding direction side of the hook-shaped part 342, the gap between the hook-shaped part 342 and the interference part 344 that is about to come out from the hole 302 while being deformed. Friction occurs. This friction prevents or effectively suppresses the hook-shaped portion 342 from coming out of the hole portion 302.

  Thus, the rod-shaped portion 342 of the wire 196 is pulled out from the insertion hole 192 as the spool 24 rotates in the pull-out direction by preventing or effectively suppressing the hook-shaped portion 342 from coming out of the hole portion 302. While deforming.

  On the other hand, in the present embodiment, as described above, the front end side of the bent portion of the hook-shaped portion 342 is at the same position as the opening end of the hole 302 opposite to the spool 24 or opposite to the spool 24. It is located on the spool 24 side with respect to the opening end on the side. For this reason, the front end side of the bent portion in the hook-shaped portion 342 does not protrude from the end surface of the lock base 170 opposite to the spool 24.

  Therefore, even if another member such as the gear case 70 is disposed on the side of the end surface opposite to the spool 24 of the lock base 170, the wire 196 does not interfere with other members such as the gear case 70. For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of Tenth Embodiment>
Next, a tenth embodiment of the present invention will be described.

  FIG. 12 shows a configuration of a main part of the webbing take-up device 360 according to the present embodiment by a sectional view in which the spool 24 and the lock base 170 are partially broken along a direction orthogonal to the guide groove 194. Has been.

  As shown in this figure, in the present webbing take-up device 360, an insertion hole 362 constituting a holding means as a restricting portion is formed in the lock base 170. The insertion hole 362 is formed in an arc shape with the center of curvature of the lock base 170 as the center of curvature, and has a bottomed shape that opens toward the spool 24 side and is closed on the side opposite to the spool 24.

  Further, the inner width dimension of the insertion hole 362 along the radial direction of the lock base 170 is slightly larger than the outer diameter dimension of the flange 244, and the flange 244 enters the inner side of the insertion hole 362.

  Further, a guide groove 364 is formed in the spool 24 so as to overlap the guide groove 194 so as to face the insertion hole 362. The guide groove 364 has an inner width dimension along the radial direction of the spool 24 larger than that of the guide groove 194, and is curved with the axis of the spool 24 as the center of curvature similar to the guide groove 194.

  Further, as shown in FIG. 13, a slider 366 that constitutes a holding means as a holding member is fitted inside the guide groove 364. As shown in FIG. 14, the slider 366 is a curved piece having a semicircular cross section obtained by cutting a cylinder curved along the longitudinal direction of the guide groove 194 at its axial center. As shown in FIG. 13, the slider 366 is accommodated in the guide groove 364 so as to be displaceable in the winding direction along the guide groove 364 in a state where the opening direction of the cross section faces the spool 24 side.

  Also, as shown in FIG. 12, a part of the slider 366 is accommodated in the insertion hole 362.

  However, as shown in FIG. 13, the longitudinal dimension of the insertion hole 362 (the dimension along the circumferential direction of the lock base 170) is substantially equal to the dimension of the slider 366 along the circumferential direction of the spool 24. For this reason, even if the slider 366 attempts to displace the lock base 170 in the circumferential direction of the lock base 170, the slider 366 interferes with the inner wall of the insertion hole 362 and cannot be displaced.

  Further, a circular hole 368 is formed in the slider 366. The circular hole 368 penetrates along the axial direction of the spool 24 in a state where the slider 366 is accommodated in the guide groove 364, and the inner diameter dimension thereof is smaller than the outer diameter dimension of the flange 244, and the outer diameter dimension of the rod-shaped portion 202. Bigger than.

<Operation and Effect of Tenth Embodiment>
In the present embodiment, the rotation of the lock base 170 in the pull-out direction is restricted by the pawl portion 166, and the spool 24 rotates in the pull-out direction, whereby relative rotation between the lock base 170 and the spool 24 occurs. When this occurs, the slider 366 is guided by the guide groove 364 while sliding against the inner wall of the insertion hole 362 and slides in the winding direction.

  Further, in this state, the flange 244 tends to come out from the insertion hole 362. However, when the flange 244 tries to come out of the insertion hole 362, the slider 366 comes into contact with and interferes with the flange 244, thereby restricting the movement of the flange 244 in the direction of coming out of the insertion hole 362.

  As described above, the flange 244 is prevented from being pulled out of the insertion hole 362 or effectively suppressed, so that the rod-shaped portion 198 of the wire 196 is deformed while being pulled out from the insertion hole 192 as the spool 24 rotates in the pull-out direction. To do.

  On the other hand, in the present embodiment, as described above, since the end of the insertion hole 362 opposite to the spool 24 is closed, the slider 366 and the flange 244 are opposite to the spool 24 of the lock base 170. It does not protrude from the end face. Therefore, even if another member such as the gear case 70 is disposed on the side of the end surface of the lock base 170 opposite to the spool 24, the wire 196 and the slider 366 do not interfere with other members such as the gear case 70. .

  For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of Eleventh Embodiment>
Next, an eleventh embodiment of the present invention will be described.

  FIG. 15 shows a configuration of a main part of the webbing take-up device 380 according to the present embodiment by a sectional view in which the spool 24 and the lock base 170 are partially broken along a direction orthogonal to the guide groove 194. Has been.

  As shown in this drawing, in the webbing take-up device 380, the rod-shaped portion 202 is not formed on the wire 196, and the end of the bending portion 200 opposite to the rod-shaped portion 198 is the tip of the wire 196. ing. Therefore, even in this embodiment, although the insertion hole 362 is formed in the lock base 170, the wire 196 does not enter the insertion hole 362 because the rod-shaped portion 202 is not formed in the wire 196.

  Further, as shown in FIG. 15, the webbing take-up device 380 includes a slider 382 constituting a holding means as a holding member. As shown in FIG. 17, the slider 382 has a concave shape in which the cross-sectional shape is open toward the spool 24 as in the slider 366, and the slider 382 has a guide groove 364 and an insertion hole as shown in FIG. It is formed in a block shape that is curved so as to be fitted into 362.

  The curved portion 200 of the wire 196 can enter inside the slider 382, and a sawtooth convex portion (not shown) is intermittently formed along the longitudinal direction of the slider 382 on the inside of the slider 382. As the portion 200 enters, the convex portion of the slider 382 engages with the outer peripheral portion of the bending portion 200. This prevents the bending portion 200 from coming out of the end portion of the slider 382 along the bending direction of the slider 382.

<Operation and Effect of Eleventh Embodiment>
In the present embodiment, the rotation of the lock base 170 in the pull-out direction is restricted by the pawl portion 166, and the spool 24 rotates in the pull-out direction, whereby relative rotation between the lock base 170 and the spool 24 occurs. When this occurs, the slider 366 is guided by the guide groove 364 while sliding against the inner wall of the insertion hole 362 and slides in the winding direction.

  Further, even when the slider 382 slides relative to the spool 24 as described above, the curved portion 200 entering the inside of the slider 382 has a convex portion formed on the inner wall of the slider 382 on the outer peripheral portion of the curved portion 200. By being engaged, it slides with the slider 382. As a result, the rod-shaped portion 198 of the wire 196 is deformed while being pulled out from the insertion hole 192 as the spool 24 rotates in the pull-out direction.

  On the other hand, in the present embodiment, as described above, since the insertion hole 362 is closed at the end opposite to the spool 24, the slider 382 protrudes from the end surface opposite to the spool 24 of the lock base 170. There is nothing to do. Therefore, even if another member such as the gear case 70 is disposed on the side of the end surface of the lock base 170 opposite to the spool 24, the slider 382 does not interfere with other members such as the gear case 70.

  For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of the twelfth embodiment>
Next, a twelfth embodiment of the present invention will be described.

  FIG. 18 shows a configuration of a main part of the webbing take-up device 390 according to the present embodiment in a sectional view in which the spool 24 and the lock base 170 are partially broken along the guide groove 194.

  As shown in this figure, in the present webbing take-up device 390, the insertion hole 192 is not formed in the spool 24, but an insertion hole 392 is formed in the spool 24 instead. The insertion hole 392 also opens at the bottom of the guide groove 194 as with the insertion hole 192.

  The insertion hole 392 is formed so that the opening width dimension along the circumferential direction of the spool 24 is sufficiently larger than the outer diameter dimension of the wire 196, and from the end of the insertion hole 392 on the drawing direction side, A bottom wall 394 extends toward the winding direction side, and the bottom wall 394 closes the drawing direction side from the intermediate portion of the insertion hole 392 along the circumferential direction of the spool 24. The distance between the end of the bottom wall 394 on the winding direction side and the inner wall of the insertion hole 392 is sufficiently larger than the outer diameter of the wire 196.

  On the other hand, as shown in FIG. 19, a rectangular hole 396 is formed in the lock base 170. Both ends of the bridge piece 398 are connected between portions of the inner wall of the rectangular hole 396 facing each other substantially along the radial direction of the lock base 170. The bridge piece 398 is formed in a semicircular shape in cross section in which the outer diameter gradually increases toward the spool 24 side.

  Further, the dimension from the end of the bridge piece 398 opposite to the spool 24 along the axial direction of the lock base 170 to the end surface opposite to the spool 24 of the lock base 170 is equal to or larger than the outer diameter of the wire 196. Is set to

  Further, as shown in FIG. 18, the wire 196 is not formed with the rod-shaped portions 198 and 202, and further, the bending portion 400 is formed instead of the bending portion 200. The curved portion 400 is the same as the curved portion 200 in that the curved portion 400 is curved along the guide groove 194. However, the curved portion 400 further escapes from the guide groove 194 at the middle portion in the longitudinal direction and is opposite to the guide groove 194 of the bridge piece 398. Curved to bypass.

  Further, the hook-like portion 402 in which the hook-like portion 402 is continuously formed from the end portion on the drawing direction side of the bending portion 400 has a base end side from the end portion on the drawing direction side of the bending portion 400 to the spool 24 side. It is formed by being bent, and enters the inside of the insertion hole 392 as shown in FIG.

  Further, the hook-shaped portion 402 is bent toward the drawing direction side at the intermediate portion, and faces the bottom wall 394. A portion of the inner peripheral portion of the insertion hole 392 that faces the end portion of the bottom wall 394 along the circumferential direction of the spool 24 is an interference portion 395 that constitutes a holding means as the interference means. It abuts on the hook-shaped portion 402 from the direction side.

<Operation and Effect of 12th Embodiment>
In the present embodiment, when the spool 24 rotates in the pull-out direction while the rotation of the lock base 170 in the pull-out direction is restricted by the pawl portion 166, the hook-shaped portion 402 of the wire 196 contacts the inner wall of the insertion hole 392. By being pressed while being interfered with 395, the hook-like portion 402 moves in the pull-out direction without coming out of the hook-like portion 402.

  Thus, when the hook-shaped portion 402 moves in the pull-out direction, the bending portion 400 also moves in the pull-out direction side. Here, since the bending portion 400 is bent so that the middle portion thereof exits from the guide groove 194 and bypasses the bridge piece 398, when the bending portion 400 moves in the drawing direction side, the middle portion of the bending portion 400 is bent. Further, the portion on the winding direction side is deformed so as to bypass the bridge piece 398 while being squeezed by the bridge piece 398.

  That is, the torsional deformation of the torsion shaft 36 and the load that is applied to the deformation of the bending portion 400 by the bridge piece 398 acts on the occupant via the webbing belt 30 as a force limiter load, while the spool 24 is against the lock base 170. Then, the webbing belt 30 is pulled out by rotating in the pulling direction, and energy is absorbed.

  Furthermore, as described above, either the breakage of the torsion shaft 36 due to excessive torsion of the torsion shaft 36 or the movement of the end portion of the curved portion 400 on the side opposite to the hook-shaped portion 402 toward the drawing direction side from the bridge piece 398. When either one occurs, the force limiter load decreases. As described above, the webbing retractor 10 can change (decrease) the force limiter load while the occupant's body is pulling the webbing belt 30 with a force of a predetermined magnitude or more in the vehicle sudden deceleration state. .

  On the other hand, in the present embodiment, as described above, the intermediate portion of the bending portion 400 is curved so as to escape from the guide groove 194 and bypass the bridge piece 398, but is along the axial direction of the lock base 170. The dimension from the end of the bridge piece 398 opposite to the spool 24 to the end face of the lock base 170 opposite to the spool 24 is equal to or greater than the outer diameter of the wire 196.

  For this reason, the portion of the bending portion 400 that bypasses the bridge piece 398 does not protrude from the end surface of the lock base 170 opposite to the spool 24. Therefore, even if another member such as the gear case 70 is disposed on the side of the end surface of the lock base 170 opposite to the spool 24, the curved portion 400 of the wire 196 may interfere with other members such as the gear case 70. Absent.

  For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

<Configuration of thirteenth embodiment>
Next, a thirteenth embodiment of the present invention will be described.

  FIG. 20 shows a configuration of a main part of the webbing take-up device 410 according to the present embodiment in a sectional view in which the spool 24 and the lock base 170 are partially broken along the guide groove 194.

  As shown in this figure, in the present webbing take-up device 410, an insertion hole 412 as a restricting means is formed in the lock base 170 on the winding direction side of the insertion hole 192. The insertion hole 412 is a bottomed circular hole that opens toward the spool 24, and its opening radius is slightly larger than the outer diameter of the wire 196.

  Further, in the present embodiment, the bending portion 200 is not formed on the wire 196, and a bending portion 414 is formed instead. The bending portion 414 has basically the same shape as the bending portion 200, but unlike the bending portion 200, a rod-shaped portion 198 is formed at the end of the bending portion 414 on the winding direction side, and the bending portion 414 is pulled out. A rod-like portion 202 is formed at the end on the side, and the rod-like portion 202 is fitted into the insertion hole 412.

<Operation and Effect of 13th Embodiment>
In the present embodiment, when the spool 24 rotates in the pull-out direction while the rotation of the lock base 170 in the pull-out direction is restricted by the pawl portion 166, the insertion hole 412 approaches the insertion hole 192. Since the insertion hole 412 has a bottomed shape as described above, the rod-shaped portion 202 cannot move to the opposite side of the spool 24. For this reason, the wire 196 enters the insertion hole 192 and is deformed into a rod shape while the bending portion 414 is squeezed by the opening edge of the insertion hole 192.

  That is, the load that is used for the torsional deformation of the torsion shaft 36 and the deformation of the bending portion 414 when the bending portion 414 is squeezed by the opening edge of the insertion hole 192 and enters the insertion hole 192 is the force limiter load. The spool 24 is rotated in the pull-out direction with respect to the lock base 170 while acting on the occupant via the webbing belt 30, and the webbing belt 30 is pulled out to absorb energy.

  Further, as described above, the torsion shaft 36 is broken due to excessive torsion of the torsion shaft 36, and the insertion hole 412 and the insertion hole 192 face each other as shown in FIG. When any one of the deformation of the curved portion 414 that has been deformed is generated, the force limiter load is reduced.

  As described above, the webbing retractor 10 can change (decrease) the force limiter load while the occupant's body is pulling the webbing belt 30 with a force of a predetermined magnitude or more in the vehicle sudden deceleration state. .

  On the other hand, in the present embodiment, as described above, since the insertion hole 412 is a bottomed circular hole that opens toward the spool 24 side, the rod-shaped portion 202 is the end surface of the lock base 170 opposite to the spool 24. It does not protrude from. Therefore, even if another member such as the gear case 70 is disposed on the side of the end surface opposite to the spool 24 of the lock base 170, the wire 196 does not interfere with other members such as the gear case 70.

  For this reason, other members such as the gear case 70 can be disposed close to the end surface of the lock base 170 opposite to the spool 24. As a result, the entire webbing retractor 10 can be reduced in size.

It is a disassembled perspective view of the principal part of the webbing winding device concerning a 1st embodiment of the present invention. It is an expanded sectional view of the principal part of the webbing winding device concerning a 1st embodiment of the present invention. 1 is an exploded perspective view showing an overall configuration of a webbing take-up device according to a first embodiment of the present invention. It is sectional drawing corresponding to FIG. 2 which expanded the principal part of the webbing winding apparatus which concerns on the 2nd Embodiment of this invention. It is an expansion disassembled perspective view of the principal part of the webbing winding device concerning a 3rd embodiment of the present invention. It is the perspective view corresponding to FIG. 5 which expanded and disassembled the principal part of the webbing winding apparatus which concerns on the 4th Embodiment of this invention. It is the perspective view corresponding to FIG. 5 which expanded and disassembled the principal part of the webbing winding device which concerns on the 5th Embodiment of this invention. It is the perspective view corresponding to FIG. 5 which expanded and disassembled the principal part of the webbing winding device which concerns on the 6th Embodiment of this invention. It is an expanded sectional view of the principal part of the webbing winding device concerning a 7th embodiment of the present invention. It is sectional drawing corresponding to FIG. 9 which expanded the principal part of the webbing winding apparatus which concerns on the 8th Embodiment of this invention. It is sectional drawing corresponding to FIG. 9 which expanded the principal part of the webbing winding apparatus which concerns on the 9th Embodiment of this invention. It is an expanded sectional view of the principal part of the webbing winding device concerning a 10th embodiment of the present invention. It is a perspective view of the slider which comprises a control means in the 10th Embodiment of this invention. It is a figure which shows the principal part of the webbing winding device which concerns on the 10th Embodiment of this invention, (A) is a front view of a spool, (B) is a rear view of a lock base (rotary body). It is an expanded sectional view of the principal part of the webbing winding device concerning an 11th embodiment of the present invention. It is a perspective view of the slider which comprises a control means in the 11th Embodiment of this invention. It is a figure which shows the principal part of the webbing winding apparatus which concerns on the 11th Embodiment of this invention, (A) is a front view of a spool, (B) is a rear view of a lock base (rotary body). It is an expanded sectional view of the principal part of the webbing winding device concerning a 12th embodiment of the present invention. It is a perspective view of the lock base (rotary body) of the webbing retractor according to the twelfth embodiment of the present invention. It is an expanded sectional view of the principal part of the webbing winding device concerning a 13th embodiment of the present invention. It is sectional drawing corresponding to FIG. 20 which shows the state which the deformation | transformation of the wire was completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Webbing winding device 24 Spool 30 Webbing belt 120 Lock mechanism 170 Lock base (rotary body)
194 Guide groove 196 Wire 204 Insertion hole 208 Stopper (flange, holding means)
210 Restriction part (regulation means, holding means)
212 Contact surface 220 Webbing take-up device 226 Stopper (flange, holding means)
240 Webbing take-up device 244 Flange (holding means)
260 Webbing take-up device 270 Webbing take-up device 272 Rectangular hole (insertion hole)
278 Contact surface 284 Flange 290 Webbing take-up device 300 Webbing take-up device 302 Hole 308 Interference part (interference means)
320 Webbing take-up device 326 Interference part (interference means)
340 Webbing retractor 344 Interference part (interference means)
360 Webbing Winder 362 Insertion Hole (Regulator)
366 Slider (holding member)
380 Webbing take-up device 382 Slider (holding member)
390 Webbing take-up device 392 Insertion hole 395 Interference part (interference means)
410 Webbing take-up device 412 Insertion hole (limitation means)

Claims (7)

A spool that winds the webbing belt from the base end side to the outer peripheral portion by rotation in one winding direction around its own axis, with the longitudinal base end side of the long belt-shaped webbing belt locked.
The spool is integrally connected to the spool in a state adjacent to the one end on the side of the one end in the axial direction of the spool, and the winding direction of a certain size or more in a state where the rotation of the spool is restricted. A rotating body capable of rotating the spool in the pull-out direction by applying a rotational force in the opposite pull-out direction to the spool;
A locking mechanism that directly or indirectly engages the rotating body and restricts rotation in a pulling-out direction opposite to the winding direction;
A guide groove formed on at least one of the axial end portion of the spool and the end surface of the rotating body on the spool side and opening toward the other and having a longitudinal direction inclined with respect to the axial direction of the spool. And when the spool is displaced in the winding direction with respect to the rotating body, the spool moves relative to the spool or the rotating body while moving in the guide groove. A wire deformed by a spool or the rotating body;
The rotating body is provided on the spool side with respect to the end surface opposite to the spool, and the tip of the wire can be rotated relative to either the rotating body or the spool together with either the rotating body or the spool. Holding means for holding the distal end side;
A webbing take-up device comprising: A length along at least one direction which is provided on the distal end side of the wire inclined with respect to the longitudinal direction of the guide groove and intersects the longitudinal direction of the wire on the distal end side of the wire is in the one direction. A flange that is larger than the dimension on the proximal side relative to the distal end of the wire along;
The flange is provided inside an insertion hole formed in one of the spool and the rotating body so as to be insertable, and extends from the proximal end side of the wire to the flange along the longitudinal direction on the distal end side of the wire. A restricting means having an abutting surface that abuts and restricts movement of the flange in a direction of coming out from the insertion hole to the other side of the spool and the rotating body;
And the flange in the insertion hole is positioned closer to the spool side than the end surface of the rotating body opposite to the spool.
The webbing take-up device according to claim 1. Of the spool and the rotating body, the flange is opened so as to be insertable from the side where the insertion hole is not formed, and the flange inserted inward faces the contact surface. A guide hole that is movably communicated with the insertion hole is formed on the spool and the rotating body in which the insertion hole is formed.
The webbing take-up device according to claim 2. The wire is rotated in the pulling-out direction of the spool with respect to the rotating body out of the spool and the rotating body at a position displaced with respect to the guide groove along the rotation axis direction of the spool and the rotating body. A hole is formed in a direction not to be deformed, and at least a tip side of the bent portion of the wire bent in parallel with the rotation axis of the rotating body with respect to the longitudinal direction of the guide groove, the rotating body Accommodated in the hole on the spool side of the surface opposite to the spool,
Further, the hole is provided in the hole portion on the spool side with respect to the surface opposite to the spool of the rotating body, and when rotating in the pull-out direction of the spool with respect to the rotating body, Interference along the circumferential direction of the spool with respect to the outer peripheral portion of the wire, and movement in the direction of coming out from the hole on the tip side of the wire to the other side with respect to the bent portion is caused by the interference. The holding means is configured to include an interference means for limiting the friction with the wire.
The webbing take-up device according to claim 1. A holding member that is provided closer to the spool than the surface opposite to the spool of the rotating body and holds the tip of the wire;
Of the spool and the rotating body, the spool is formed so as not to deform the wire when the spool is rotated in the pull-out direction with respect to the rotating body, and restricts displacement of the holding member along the circumferential direction of the spool. The regulatory department,
Including the holding means,
The webbing take-up device according to claim 1. The holding means is provided in the spool, the holding means holds the wire distal end side so as to be rotatable together with the spool, and the rotating body deforms the wire by the rotation of the spool in the pulling direction with respect to the rotating body. Let
The webbing take-up device according to any one of claims 1 to 5, wherein the webbing take-up device is any one of the above. The longitudinal base end side of the long belt-like webbing belt is locked, and the webbing belt is wound from the base end side to the outer peripheral portion by rotation in one winding direction around its own axis, and at one end in the axial direction. A spool having an open spool side insertion hole;
The spool is integrally connected to the spool in a state adjacent to the one end on the side of the one end in the axial direction of the spool, and the winding direction of a certain size or more in a state where the rotation of the spool is restricted. A rotating body capable of rotating the spool in the pull-out direction by applying a rotational force in the opposite pull-out direction to the spool;
A locking mechanism that directly or indirectly engages the rotating body and restricts rotation in a pulling-out direction opposite to the winding direction;
The spool is formed in at least one of the spool and the rotating body and communicates with the opening end of the spool side insertion hole, and the longitudinal direction is inclined with respect to the opening direction of the spool side insertion hole, and the spool is rotated. A longitudinal intermediate portion is accommodated in a guide groove at least a part of which is positioned on the winding direction side of the opening end of the spool side insertion hole in a state before rotating in the pulling direction with respect to the body, A wire whose longitudinal base end side is bent with respect to the intermediate portion and inserted into the spool side insertion hole;
The rotating body is provided on the rotating body on the side of the pulling direction from the opening end of the spool side insertion hole and on the spool side of the rotating body on the opposite side of the spool. Limiting means for contacting the distal end side of the wire from the withdrawal direction side in a state of rotating in the withdrawal direction, and restricting the displacement of the distal end side of the wire in the withdrawal direction;
A webbing take-up device comprising:

Images