JP2002274324A - Seat belt device and its operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of strongly arresting an occupant to a seat in regular driving without giving an excessive restrained feeling to the occupant before shifting to the regular driving. SOLUTION: Left/right shoulder belts 5 are connected to left/right waist belts 1 by a sewing part 6, respectively. The left/right shoulder belts 5 get over the upper part of a seat back 10 and extend in the rearward of the seat back 10, are connected at a sewing part 7, and wound around by a seat belt winder 9 connected to an anchor 8 fixed to the car body. The seat belt winder 9 has a function winding the shoulder belts 5 by a power generating device except for an elastic force and arrests the occupant to the seat back 10 by a strong winding force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt system which is used in a racing car or the like and has at least one waist belt for fixing the occupant's waist and a plurality of shoulder belts for fixing the occupant's shoulder. It is.

[0002]

2. Description of the Related Art In a seat belt system used for a general passenger car, one end is fixed to an outer anchor mounted on a door side at a lateral portion of a seat, and is connected to a shoulder anchor provided on a pillar of a vehicle body. Attach a tongue to the seat belt that is wound by the seat belt retractor, and when attaching the seat belt, attach the tongue to a buckle anchor that is fixed to the buckle anchor that is fixed to the side of the seat and inside the vehicle body. , The shoulder and the waist of the occupant are simultaneously restrained.

[0003] The seat belt rewinding device takes up the slack by rewinding the seat belt by the elastic force of a mainspring or the like, and when a sudden rewinding force is applied by a collision or the like, or when the posture of the automobile changes, The seat belt drawer is locked, and the occupant is restrained by the seat. That is, a general passenger car is required to have a function of restraining the occupant by the seat belt as little as possible during steady driving, and restraining the occupant to the seat in an accident or the like.

[0004] On the other hand, in a vehicle such as a racing car which is driven at a high speed or where a sudden acceleration is constantly applied, it is necessary to strongly restrain the occupant to the seat during steady driving. Further, in such an automobile or the like, since an accident occurs rapidly, a response cannot be made by a lock mechanism of a seat belt retractor used in a general passenger car. Therefore, the seat belt device used in the general passenger car as described above cannot be used, and a seat belt device of a type in which the occupant is restrained to a tight seat by manual operation has been used.

In such a seat belt device,
A waist belt for fixing the occupant's waist and a shoulder belt for fixing the occupant's shoulder are provided separately. Then, the waist belt is connected to the other end of each of the left and right belts, one end of which is fixed to the vehicle body, by a buckle, and the waist of the occupant is strongly fixed to the seat by manually adjusting the length of the belt. On the other hand, the shoulder belt is connected to the other end of the left and right belts, one end of which is fixed to the vehicle body behind the seat, to the buckle of the waist belt, and by manually adjusting its length,
Strongly fix the occupant's shoulder to the seat.

[0006]

However, in the above-mentioned seatbelt device used for a racing car, the body is strongly fixed with the seatbelt from the time when the occupant gets on the vehicle. Since the occupant is uncomfortable before moving on and the movement of the body is restrained, the occupant cannot move his body to see the surroundings.

[0007] The present invention has been made in view of such circumstances, and does not give an occupant an excessive sense of restraint before moving to steady running, and can strongly restrain the occupant to a seat during steady running. It is an object to provide a device.

[0008]

According to a first aspect of the present invention, there is provided a seat belt apparatus having at least one waist belt and a plurality of shoulder belts, wherein the shoulder belt has a power other than elastic force. A seat belt device having a shoulder belt winding device having a function of winding by a generating device (claim 1).

This device has a function of winding the shoulder belt by a power generating device other than the elastic force. By controlling this power generating device, the occupant's shoulder is strongly restrained by the seat only when necessary, such as during steady running. When it is unnecessary, the occupant is not restrained or the restraining force is reduced by preventing the power from the power generating device from being generated or transmitting the power from the power generating device to the shoulder belt. Therefore, the occupant can be strongly restrained by the seat when necessary, and the occupant can be prevented from giving a sense of restraint otherwise.

[0010] A second means for solving the above-mentioned problems is as follows.
The first means, wherein the shoulder belt winding device also has a function of winding the shoulder belt by elastic force (Claim 2).

In this means, even if the power generator is not operated, the power of the power generator is not transmitted to the shoulder belt, or the power generator is not operated,
By winding the shoulder belt by the elastic force, the slack of the shoulder belt can be eliminated.

A third means for solving the above-mentioned problem is as follows.
The first means or the second means, wherein the shoulder belt winding device has a function of locking the pullout of the shoulder belt by an external signal (Claim 3). is there.

The present means has a function of locking the pull-out of the shoulder belt by a signal from the outside. Therefore, after the shoulder belt is strongly wound by the power generation device, a signal is given from the outside to apply the signal to the shoulder belt. The drawer can be locked. As a result, the occupant can be strongly restrained by the seat at all times, ensuring safety in the event of an accident and suppressing the occupant's movement even when a large acceleration is applied during traveling. In addition, the operability of the vehicle can be ensured, and the stability of the body can be maintained. Further, since the power of the power generation device may be weakened, the feeling of pressure given to the occupant can be reduced.

A fourth means for solving the above-mentioned problem is as follows.
In any one of the first means to the third means, the shoulder belt rewinding device mechanically connects the power generation device and the shoulder belt, and the power generation device outputs power in a winding direction. (Function 4).

In this means, the mechanical connection between the power generation device and the shoulder belt is connected only when the power generation device is generating power in the winding direction. Therefore, when the power generation device does not generate power in the winding direction, the shoulder belt is mechanically separated from the power generation device, and when a human pulls out the shoulder belt, the power generation device is disconnected from the load. It does not become difficult to pull out. Further, in the case of the second means, the power generation device does not become a load of the elastic force, and the winding can be smoothly performed by the elastic force. Note that “mechanical connection” does not only mean that the vehicle is directly connected, but also includes the case where the vehicle is connected via a power transmission mechanism such as a gear. The same applies to the means (claims).

A fifth means for solving the above-mentioned problem is as follows.
In any one of the first means to the third means, the shoulder belt winding device has a function of turning on and off a mechanical connection between the power generation device and the shoulder belt by an external signal. (Claim 5).

In the fourth means, the mechanical connection between the power generation device and the shoulder belt is automatically performed as a function of the shoulder belt winding device itself. This means is different from the fourth means only in that the on / off operation is performed by an external signal. Therefore, this means produces the same operation and effect as the fourth means.

A sixth means for solving the above-mentioned problem is as follows.
The shoulder belt winding device according to any one of the first to fifth means, wherein the shoulder belt winding device winds the shoulder belt by power other than elastic force when a first external signal is turned on. And a function of locking the pull-out of the shoulder belt when the second signal from the outside is turned on (claim 6).

In this means, when the occupant is strongly restrained by the seat, the first signal is turned on, and the shoulder belt is wound by power other than elastic force. When the winding is completed, the second signal is turned on to lock the drawer of the shoulder belt. Thus, the occupant is strongly restrained by the seat. After turning on the second signal, the first
May be turned off to stop winding by the power generation device. If the lock mechanism has a ratchet mechanism that allows rotation in the seat belt winding direction, the first signal may be turned on and the second signal may be turned on at the same time.

When the second signal is turned on, for example, when the power generation device is a motor, the completion of winding is detected by detecting the current value and torque of the motor, and the timing is determined. It is conceivable to turn it on with. By turning off both the first signal and the second signal, both the winding by the power generator and the locking of the shoulder belt drawer are stopped, and the strong restraint of the occupant is released.

A seventh means for solving the above-mentioned problem is as follows.
The shoulder belt winding device according to any one of the first to fifth means, wherein the shoulder belt winding device winds the shoulder belt by power other than elastic force when a first external signal is turned on. And a function of locking the drawer of the shoulder belt after a predetermined time has elapsed (claim 7).

In this means, when the occupant is to be strongly restrained by the seat, the first signal is turned on and the shoulder belt is wound by power other than elastic force. After the completion of the predetermined time, the drawer of the shoulder belt is locked. This predetermined time is a time for which the winding of the shoulder belt is sufficiently completed. After the lock is completed, winding by the power generation device may be stopped. When the first signal is turned off, both the winding by the power generation device and the locking of the shoulder belt withdrawal are stopped, and the strong restraint of the occupant is released.

Eighth means for solving the above-mentioned problem is:
The fifth means, wherein the shoulder belt winding device turns on a mechanical connection between the power generation device and the shoulder belt when a first external signal is turned on, The shoulder belt is wound by a power other than the elastic force, and has a function of locking the pull-out of the shoulder belt when a second signal from the outside is turned on (claim 8).

In this means, in addition to the function of the sixth means, when the first external signal is turned on,
A function is added to enable the mechanical connection between the power generation device and the shoulder belt. Therefore, only when the power generation device is generating power in the winding direction, the power generation device and the shoulder belt are mechanically connected, otherwise the connection is disconnected, When pulling out the shoulder belt, the power generator does not become a load,
Even when winding by elastic force is performed, the power generating device does not become a load of elastic force.

A ninth means for solving the above problems is:
The fifth means, wherein the shoulder belt winding device turns on a mechanical connection between the power generation device and the shoulder belt when a first external signal is turned on, The shoulder belt is wound by a power other than the elastic force, and has a function of locking the drawer of the shoulder belt after a predetermined time has elapsed (claim 9).

In this means, in addition to the function of the seventh means, when a first external signal is turned on,
A function is added to enable the mechanical connection between the power generation device and the shoulder belt. Therefore, only when the power generation device is generating power in the winding direction, the power generation device and the shoulder belt are mechanically connected, otherwise the connection is disconnected, When pulling out the shoulder belt, the power generator does not become a load,
Even when winding by elastic force is performed, the power generating device does not become a load of elastic force.

A tenth means for solving the above-mentioned problem is the operation method according to any one of the sixth means to the ninth means, wherein the first signal and the second signal are respectively (Claim 10).

In this means, the first signal, the second signal,
(In the seventh means and the ninth means, only the first signal) is given by a human operation, so that when a human determines that it is optimal, the human Can be restrained or released.

An eleventh means for solving the above-mentioned problem is an operation method according to any one of the sixth means to the ninth means, wherein a state of the vehicle is detected, and according to the state,
The present invention is characterized in that the first signal and the second signal are automatically given (claim 11).

According to this means, the occupant can be strongly restrained by the seat or the restraint can be released according to the state of the vehicle. For example, the speed of an automobile is detected, and when the speed exceeds a predetermined value or more, a first signal and a second signal are provided. Thus, the occupant is not strongly restrained when the racing car or the airplane is stopped or running at a low speed, and the occupant can be strongly restrained by the seat when the vehicle is running at a high speed or flying.

In addition, when the tension detected by the tension sensor of the shoulder belt becomes a predetermined value or more, when the acceleration detected by the acceleration sensor becomes a predetermined value or more, it is determined that the buckle of the waist belt is engaged. The first signal and the second signal may be provided when a sensor detects the signal.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an example of an embodiment of a seatbelt device according to an embodiment of the present invention, where (a) is a front view and (b) is a side view. The left and right waist belts 1 are attached at one end to an anchor 2 fixed to the floor, and the other ends of the two are attached to a buckle 3 and a tongue 4.
Are connected by The length of the double waist belt 1 can be manually adjusted by well-known means.
Strongly fixed to 1.

The left and right shoulder belts 5 are connected to the left and right waist belts 1 by sewing portions 6, respectively. These left and right shoulder belts 5 extend over the upper portion of the seat back 10 and extend to the rear of the seat back 10, and are joined by the sewing portion 7,
The seat belt is wound by a seat belt winding device 9 connected to an anchor 8 fixed to the vehicle body.

FIG. 2 shows an example of an installation position of the seat belt retractor 9. (A) is an example of a front seat, and the seat belt winding device 9 is attached to the seat frame 12. (B) is an example of a rear seat, and the seat belt retractor 9 is fixed to a rear panel 13.

FIG. 3 is an exploded perspective view showing an outline of an example of a seat belt winding device for winding a shoulder belt used in the seat belt device according to the embodiment of the present invention. As shown in FIG. 3, in the seat belt retractor 21, a spool 24 that winds up a seat belt 23 is stored in a frame 22, and one end of a torsion bar 25 that supports the spool 24 fits into a retainer 26. The multi-end is fitted inside the spool 24. Spool shaft 24a
Is fitted in a bearing of the mainspring unit 27 in which a seat belt winding spring (not shown) is stored. The retainer 26 and the mainspring unit 27 are held by the frame 22, so that the spool 24
It is housed in the frame 22 while being held by the retainer 26 and the mainspring unit 27.

The motor 28 is held by a second retainer 29, and a motor gear 30 connected to the shaft of the motor 28 meshes with a connect gear 31, and the connect gear 31 is connected to the intermediate reduction gear 32.
Through the reduction gear 33. Reduction gear 33
Has a large-diameter tooth portion 33a that meshes with the intermediate reduction gear 32 at an outer diameter portion thereof, and has a sun gear 33b at a central portion thereof.

The center hole (spline hole) 34c of the carrier gear 34 is fitted in the spline shaft 24b of the spool 24, and rotates integrally with the spool 24. As shown in detail in FIG. 3, ratchet teeth 34b are formed in the large diameter portion of the carrier gear 34. The carrier gear 34 is provided with three screw holes 34d, into which the leading ends of the reduction pins 35 are screwed. One planetary gear 36 is rotatably supported on each reduction pin 35, and is held by a reduction plate 37.

As shown in detail in FIG. 4, the internal gear 38 has an annular shape. Ratchet teeth 38a are provided on the outer periphery thereof, and internal teeth 38b meshing with the planetary gear 38 are provided on the inner periphery thereof. I have. That is, the planetary gear 36 is sandwiched between the sun gear 33 b and the internal teeth 38 b of the internal gear 38, so that the planetary gear 36 can rotate around the reduction pin 35, and the center of the carrier gear 34 (the axis of the spool 24). It is possible to revolve around.

As a mechanism for turning on and off the power transmission path of the spool 24 and the motor 28 of the seat belt retractor thus configured, a locking lever 31 and a locking lever rotatable integrally with the connect gear 31 are provided. A lever spring 42 for holding the spring 41;
Is provided.

FIG. 5 shows this mechanism in detail. Three protruding pins 43 a extending in the axial direction are provided on the axial side surface of the spring holding member 43.
The spring holding member 43 is assembled to the connect gear 31 by fitting the 3a into the three axial holes 31c of the connect gear 31 respectively. Also, three projections 43 b extending in the radial direction are provided on the outer peripheral surface of the spring holding member 43.
Are provided at equal intervals in the circumferential direction. The lever spring 42 is arranged such that the curved portion 42 a is located on the outer periphery of the spring holding member 23, and the curved portion 42 a is connected between the two protrusions 43 b of the spring holding member 43 and the connect gear 31. In the meantime, it is assembled to the spring holding member 43 by being supported with a predetermined friction in the rotation direction.

The locking lever 41 is connected to the second retainer 29.
The internal gear 38 is provided so as to be able to contact and separate from the ratchet teeth 38a by the parallel movement. Then, the locking lever 41 is moved by the lever spring 42 fitted in the concave portion 41b.
It is driven to move in parallel as described above.

The mechanism for transmitting power between the motor 28 and the spool 24 and the mechanism for turning power transmission on and off will be described below with reference to FIGS. As shown in these figures, the rotation of the motor 28 is transmitted from the motor gear 30 to the connect gear 31 via the teeth 31a of the connect gear 31, and the rotation of the motor 28 is transmitted through the teeth 31b and the teeth 32a of the intermediate reduction gear 32. It is transmitted to the reduction gear 32. The power is transmitted to the reduction gear 33 via the teeth 32 b of the intermediate reduction gear 32 and the large-diameter teeth 33 a of the reduction gear 33. The reduction gear 33 is integrally attached with a sun gear 33b with the same central axis. Therefore, when the motor 28 rotates, these gear groups rotate integrally.

On the other hand, the center hole (spline hole) 34c of the carrier gear 34 is fitted into the spline shaft 24b of the spool 24 shown in FIG. Therefore, when the spool 4 rotates, the carrier gear 34 rotates integrally, whereby the three planetary gears 36 revolve around the spool shaft.

The internal gear 38 switches the connection between the power transmission system connected to the motor 28 and the power transmission system connected to the spool 24. FIG.
FIG. 4 is a diagram showing a state when the motor 28 is not rotating. At this time, the locking lever 41 is in a position where it does not engage with the ratchet gear 38a of the internal gear 38 due to the urging force of the lever spring 42. Therefore, the internal gear 38 is completely free and can rotate without receiving any resistance. On the other hand, in order to rotate the sun gear 33b and the reduction gear 33, the rotational resistance of the motor 28 must be overcome.

When the spool 24 rotates in either direction in such a state, the planetary gear 36 revolves. At that time, since there is no resistance of the internal gear 38, the planetary gear 36 rotates while the sun gear 33 rotates.
Revolve around a and rotate the internal gear 38. That is, the sun gear 33a does not rotate. Therefore,
The spool 4 can rotate without receiving the rotation resistance of the motor 28. Therefore, in particular, when a person pulls out the seat belt, the pulling-out can be performed without receiving a large resistance force (only the force of the winding spring is sufficient).

FIG. 7 is a diagram showing a state where the motor 28 is driven in the seat belt winding direction. That is, when the motor 28 rotates in the CW direction in the figure, the connect gear 31 rotates at a reduced speed in the CCW direction. Then
As described above, the curved portion 42a of the lever spring 42 is connected to the projection 43b of the spring holding member 43 and the connect gear 31.
Are held with a predetermined friction in the rotation direction between the connection gear 31 and the connection gear 31, and the rotation of the connect gear 31 in the CCW direction causes the lever spring 42 to rotate together in the same direction.

As a result, the locking lever 41 moves parallel to the direction approaching the internal gear 38,
“a” comes into contact with the outer periphery of the ratchet teeth 38 a of the internal gear 38 and becomes the engagement position where the engagement is possible. After the locking claw 41a comes into contact with the outer periphery of the ratchet teeth 38a, the lever spring 42 cannot rotate any more in the direction CCW. However, the connecting gear 31 and the lever spring 4
2 and the connect gear 31 rotates relative to the lever spring 42. Thereby, the motor 28 can continue to rotate.

At the same time, the rotation of the connect gear 31 is reduced via the intermediate reduction gear 32 and transmitted to the reduction gear 33, and the reduction gear 33 rotates in the belt CCW direction.
The sun gear 33b rotates at the same speed as the reduction gear 33 in the same direction. Each planetary gear 3 is rotated by the rotation of the sun gear 33a.
6 rotates in the CW direction, and the internal gear 38 rotates in the CW direction. At this time, since the internal gear 38 rotates, each planetary gear 36 does not revolve.

When the internal gear 38 rotates in the CW direction, the ratchet teeth 38a and the locking claws 41a engage with each other, and the rotation of the internal gear 38 stops. When the rotation of the internal gear 38 stops, each planetary gear 36 rotates by the driving torque of the motor 28 as described above.
8 along the inner teeth 38b and around the sun gear 33b.
The vehicle is decelerated in the CW direction and revolves.

Therefore, since the carrier gear 34 holding the planetary gears 36 rotates in the CCW direction at the revolution speed of each planetary gear 36, the spool 24 rotates in the seat belt winding direction.

FIG. 8 is a view showing a state where the motor 28 rotates in the seat belt rewinding direction. Motor 2
When 8 rotates in the CCW direction in the figure, the connect gear 31 is reduced in the CW direction and rotates. Then, as described above, the curved portion 42a of the lever spring 42 is held with a predetermined friction in the rotational direction between the projection 43b of the spring holding member 43 and the connect gear 31. With the rotation in the CW direction, the lever spring 42 also rotates together in the same direction. As a result, the locking lever 41 moves parallel to the direction away from the internal gear 38, and the engagement between the locking claw 41a and the ratchet teeth 38a of the internal gear 38 is released. Then, the rotation of the internal gear 38 becomes free.

As shown in FIG. 7, the rotation of the motor 28 drives the reduction gear 33 and the sun gear 33a.
The rotation of the sun gear 33a is transmitted to the planetary gear 36 to rotate the planetary gear 36. However, since the internal gear 38 rotates without rotational resistance, the planetary gear 36 does not revolve, and therefore, the rotation of the motor 28 is not transmitted to the spool 24.

In summary, when the motor rotates in the winding direction, the rotation of the internal gear is stopped by the locking lever driven by the rotational force, and thereby the power transmission path between the motor and the spool Are combined. In other cases, there is no engagement between the locking lever and the internal gear, and the internal gear can rotate freely, so that the power transmission path between the motor and the spool is disconnected.

In the above embodiment, the locking lever is driven by using the power of the motor.
For example, it may be electrically driven by a solenoid or the like to engage or disengage with the internal gear.

Hereinafter, a mechanism for locking the rotation of the spool 24 in the seat belt rewind direction and allowing the rotation in the seat belt rewind direction will be described. This corresponds to the ratchet teeth 34b of the carrier gear 34 shown in FIG.
, A solenoid 44, a plunger spring 45, a ratchet lever 46, a pawl 47, and a ratchet spring 48. The operation of this mechanism is described in FIGS.
3 will be described.

FIG. 9 is an exploded perspective view showing a main part of a lock mechanism (ratchet mechanism). A ratchet lever 46 is engaged with the piston 44a of the solenoid 44,
When the solenoid 44 is not excited, the piston 44a is extended by the action of the plunger spring 45, and the ratchet lever 46 is pushed upward in the drawing. Projection 4 provided on ratchet lever 46
6 c penetrates the hole 47 d of the pawl 47 and fits into the long hole 29 a of the second retainer 29.

As shown in FIGS. 10 to 13, one end of the ratchet spring 48 is fixed to the second retainer 29, and the other end thereof comes into contact with the projection 47e of the pawl 47. And the projection 46c of the ratchet lever 46 as a rotation axis, the carrier gear 34
Of the ratchet teeth 34b.
Although not shown in the figure, the projection 47e is also provided at the same position on the back side of the pawl 47, and this is the second projection.
The retainer 29 is fitted into the elongated hole 29b. (Note that in FIG. 9, the shape of the second retainer 29 is slightly different from that shown in FIG. 3, but it is not related to the description of the present invention, so that both are not intentionally matched.)

Hereinafter, the operation of the lock mechanism having such a structure will be described with reference to FIGS. FIG.
This shows a steady state in which the solenoid 44 is not excited. At this time, the plunger spring 45
The piston 44a is extended by the urging force, and the ratchet lever 46 is located at the upper end of the guide portion 29c.
At this time, the projection 46c is in contact with the upper end of the elongated hole 29a. One end of the ratchet spring 48 is fixed to the second retainer 29, and abuts on the projection 47 e of the pawl 47 via a pin 29 c provided on the second retainer 29,
The pawl 47 is rotated counterclockwise in the figure with the projection 46c as a rotation axis. Therefore, in a state where the projection 47e on the back side of the pawl 47 hits the upper right end of the elongated hole 29b of the second retainer 29, the rotation of the pawl 47 is stopped, and the pawl 47 is stopped.
Is positioned at that position.

However, in this state, the engaging portion 47c of the pawl 47 is separated from the teeth of the ratchet teeth 34b of the carrier gear 34, and the carrier gear 34 can rotate freely, so that the rotation of the spool 24 is not hindered. .

FIG. 11 shows a change in the state when the solenoid 44 is excited from the state shown in FIG.
At this time, the piston 44a is
, And the ratchet lever 46 is lowered downward along the guide portion 29c. And
The projection 46c stops at a position where it contacts the lower end of the elongated hole 29a. At this time, the pawl 47 has a projection 46 in the hole 47d.
Since c penetrates, its position goes down. At this time, the pawl 47 is pushed by the urging force of the ratchet spring 48 so that the projection 47e is in contact with the upper right end of the elongated hole 29b.
Is further rotated counterclockwise from the position shown in FIG. Thereby, as shown in FIG.
7c is the ratchet tooth 34 of the carrier gear 34.
It comes to a position where it meshes with the tooth part b.

FIG. 12 shows a state in which the spool 24 rotates in the direction of rewinding the seat belt in the state shown in FIG. At this time, carrier gear 3
4 rotates clockwise as shown in the figure. Then, the ratchet teeth 34b and the engaging portion 47c of the pawl 47 mesh with each other. Therefore, the pawl 47 tries to rotate counterclockwise around the projection 46c as shown by the arrow in the figure.
Since the protrusion 47e is restrained at the end of the elongated hole 29b, it cannot rotate, so that the rotation of the carrier gear 34 is stopped. Therefore, the spool 24 cannot rotate in the direction of rewinding the seat belt.

FIG. 13 shows a state where the spool 24 rotates in the direction of winding the seat belt in the state shown in FIG. At this time, carrier gear 3
4 rotates counterclockwise as shown in the figure. Then
Since the engaging portion 47c of the pawl 47 is pressed by the ratchet teeth 34b, the pawl 47 rotates clockwise around the projection 46c. This rotation is performed against the urging force of the ratchet spring 48. As a result, the protrusion 47e on the back side of the pawl 47 can move to the lower left end of the elongated hole 29b.

In this manner, the pawl 47 rides over the gear of the carrier gear 34 in a state where the engaging portion 47c is brought into contact with the gear of the carrier gear 34 by the urging force of the ratchet spring 48, thereby allowing the rotation of the carrier gear. . When the spool tries to rotate in the rewinding direction from the state shown in FIG. 13, the engaging portion 47c is in contact with the ratchet teeth 34b of the carrier gear 34.
2, the rotation of the spool 24 is prevented.

As described above, when the solenoid 44 is not excited, the rotation of the spool is free, and when the solenoid 44 is excited, the spool is rotatable in the seat belt winding direction. Rotation becomes impossible in the rewind direction.

Even if the solenoid 44 is de-energized from the state shown in FIG. 12, the engagement between the pawl 47 and the ratchet teeth 34b is not released, and the piston 24a is moved to the position shown in FIG.
, The carrier gear 34 may not be able to rotate clockwise. In such a case, when the excitation of the solenoid 44 is released,
Preferably, the carrier gear 34 is slightly rotated counterclockwise. Thereby, the pawl 47 and the ratchet teeth 34b are disengaged from each other, and the state shown in FIG. 8 is realized.

FIG. 14 is a flowchart showing an example of an operation when such a seat belt retractor is used. In this example, whether or not the occupant is strongly restrained by the seat is determined based on whether or not the speed of the vehicle is equal to or higher than a predetermined value.

First, the occupant gets on the vehicle and pulls out the shoulder belt from the seat belt retractor (step S10).
1). At this time, since the buckle is not engaged, the control device does not excite the solenoid 44 and does not supply power to the motor 28. Therefore, as described above, the mechanical connection between the motor 28 and the spool 4 is cut off, and the mechanism for locking the rotation of the spool 4 in the pulling-out direction of the shoulder belt is not operated. When the locking lever 41 is driven separately instead of being driven by the rotation 28 of the motor, at this time, the locking lever 41
Are operated so that the rotation of the internal gear 38 is not stopped. Therefore, the shoulder belt can be easily pulled out with a force only to oppose the force of the return spring (spring).

Next, the occupant engages the buckle of the waist belt (step S102). Then, the control device proceeds to step S103
To determine whether the mode is HOLD MODE. In this case, the vehicle speed is detected, and the HOLD MODE is set when the vehicle speed is equal to or higher than a predetermined value.

If it is determined that the mode is the HOLD MODE, the process proceeds to step S104, and the motor 28 is rotated in the seat belt winding direction. However, if the lock mechanism has already been activated, winding by the motor 28 is not performed. Then, as described above, the motor 28 and the spool 4 are mechanically connected, and the shoulder belt is wound up by the motor 28. When the locking lever 41 is driven separately instead of being driven by the rotation 28 of the motor, the motor 28 is rotated in the winding direction and the rotation of the locking lever 41 is stopped at this time. To work.

After the shoulder belt has been wound by the motor 28 for a predetermined time in this manner, the process proceeds to step S105, where the lock mechanism is operated to lock the spool 4 from rotating in the shoulder belt pull-out direction. That is, the solenoid 44 is excited to bring the ratchet teeth 34b and the pawl 47 into engagement with each other. After such a state, the winding of the motor 28 is stopped. Then, the process returns to step S103 to determine whether the mode is the HOLD MODE.

In this way, once it is determined that the mode is the HOLD MODE, the occupant is strongly restrained by the seat by the winding by the motor, and the drawer of the shoulder belt is locked in this state.

If it is determined in step S103 that the mode is not the HOLD MODE, the process proceeds to step S106, where the excitation of the solenoid 44 is released, and the lock of the spool 4 in the pulling-out direction of the shoulder belt is released. At this time, as described above, the carrier gear 34 is rotated in the winding direction by the motor 28 as necessary so that the ratchet is completely released.

Next, when the occupant releases the engagement of the buckle of the waist belt (step S107), the shoulder belt is wound by the winding force of the return spring of the seat belt winding device to be in the storage position (step S108). ).

In the above description of the embodiment, a seat belt retractor capable of turning on and off a mechanical connection between a motor as power generating means and a spool as a mechanism for winding a shoulder belt has been described. However, a seat belt retractor having no such function can be used in the present invention. However, in this case, when the human pulls out the shoulder belt, the power generation device becomes a resisting force. Therefore, it is preferable to mechanically connect the motor as the power generation means and the spool as the mechanism for winding the shoulder belt. It is preferable to use one that can enter and leave

If the power generating device can continuously generate a sufficiently strong winding force, a mechanism for locking the pullout of the shoulder belt is not provided, and the occupant is restrained by the power generating device alone. You may. However, if a mechanism for locking the drawer of the shoulder belt is provided, the occupant can be reliably restrained to the seat by locking the drawer of the shoulder belt without increasing the tightening force of the power generator so much. This is more preferable because it can avoid giving the occupant a strong sense of oppression.

[0076]

As described above, according to the first aspect of the present invention, the occupant is strongly restrained by the seat when necessary, and the occupant is prevented from being restrained otherwise. can do.

According to the second aspect of the present invention, the shoulder belt is wound up by elastic force, so that slack of the shoulder belt can be eliminated. In the invention according to claim 3, safety in the event of an accident is reliably ensured,
Even when a large acceleration is applied during running, the stability of the body can be maintained. Also, the feeling of pressure given to the occupant can be reduced.

According to the fourth and fifth aspects of the present invention, when a person pulls out the shoulder belt, the power generation device does not become a load and does not become difficult to pull out. In the invention according to claim 6 and the invention according to claim 7, it is possible to strongly restrain the occupant to the seat when necessary, and to prevent the occupant from feeling restrained otherwise.

According to the eighth and ninth aspects of the present invention, the power generation device does not become a load when the shoulder belt is pulled out, and even if the winding is performed by the elastic force, The generator does not load the elastic force. In the invention according to claim 10, when the person determines that the person is optimal, the person can be restrained or released from the restraint by the seat belt.

According to the eleventh aspect of the present invention, the occupant is not strongly restrained when the racing car or the airplane is stopped or traveling at a low speed, and the occupant is strongly restrained by the seat when entering a high speed traveling or a flight. Can be constrained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an embodiment of a seat belt device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of an installation position of a seat belt retractor.

FIG. 3 is an exploded perspective view showing an outline of an example of a seat belt winding device used in the seat belt device according to the embodiment of the present invention.

FIG. 4 is a schematic diagram showing a main part of a power transmission path switching mechanism in the embodiment shown in FIG.

FIG. 5 is a schematic diagram showing a main part of a power transmission path switching mechanism in the embodiment shown in FIG.

6 is a diagram illustrating the operation of the power transmission path switching mechanism in the embodiment shown in FIG.

FIG. 7 is a diagram illustrating the operation of the power transmission path switching mechanism in the embodiment shown in FIG.

8 is a diagram illustrating the operation of the power transmission path switching mechanism in the embodiment shown in FIG.

FIG. 9 is an exploded perspective view showing a main part of a lock mechanism (ratchet mechanism) in the embodiment shown in FIG. 3;

FIG. 10 is a view for explaining the operation of the lock mechanism shown in FIG. 9;

FIG. 11 is a view for explaining the operation of the lock mechanism shown in FIG. 9;

FIG. 12 is a view for explaining the operation of the lock mechanism shown in FIG. 9;

FIG. 13 is a view for explaining the operation of the lock mechanism shown in FIG. 9;

FIG. 14 is a flowchart illustrating an example of an operation when the seatbelt winding device is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... waist belt, 2 ... anchor, 3 ... buckle, 4 ... tongue, 5 ... shoulder belt, 6 ... sewing part, 7 ... sewing part, 8 ... anchor, 9 ... seat belt winding device, 10 ... seat back, 11 ... Seat cushion, 12 ... Seat frame,
13 ... rear panel, 21 ... seat belt winding device,
Reference numeral 22: frame, 23: seat belt, 24: spool, 24a: spool shaft, 24b: spline shaft, 25
... torsion bar, 26 ... retainer, 27 ... spring unit, 28 ... motor, 29 ... second retainer, 29a ...
Slot, 29b ... Slot, 29c ... Guide, 30 ... Motor gear, 31 ... Connect gear, 31a ... Teeth, 31b ... Teeth, 3
1c: axial hole, 32: intermediate reduction gear, 32a: teeth, 3
2b: teeth, 33: reduction gear, 33a: large-diameter tooth portion, 33b
... Sun gear, 34 ... Carrier gear, 34b ... Ratchet teeth, 34c ... Center hole, 34d ... Screw hole, 35 ... Reduction pin, 36 ... Planetary gear, 37 ... Reduction plate, 38 ... Internal gear, 38a ... Ratchet teeth, 38b ... Internal teeth, 41: locking lever, 41a: locking claw, 41b: concave portion, 42: lever spring, 42a:
Bending part, 43: Spring holding member, 43a: Projecting pin, 43b: Projection, 44: Solenoid, 44a: Piston, 45: Plunger spring, 46: Ratchet lever, 46a: Rotating shaft part, 46b: Tapered part, 46c …
Projection, 47 ... Paul, 47a ... Guide hole, 47b ... Elongated hole,
47c: engagement portion, 47d: hole, 47e: projection, 48: ratchet spring

Claims (11)

[Claims] 1. A seat belt device having one or more waist belts and a plurality of shoulder belts, the shoulder belt winding device having a function of winding the shoulder belts by a power generating device other than an elastic force. A seat belt device comprising: 2. The seat belt device according to claim 1, wherein the shoulder belt winding device has a function of winding the shoulder belt by elastic force. 3. The seat belt device according to claim 1, wherein the shoulder belt winding device has a function of locking a drawer of the shoulder belt by a signal from the outside. Seat belt device. 4. One of claims 1 to 3
Wherein the shoulder belt winding device mechanically connects the power generation device and the shoulder belt, and the power generation device generates power in a winding direction. A seat belt device having a function of coupling only. 5. One of claims 1 to 3
The seat belt device according to claim 1, wherein the shoulder belt winding device has a function of turning on and off a mechanical connection between the power generation device and the shoulder belt by an external signal. Belt device. 6. One of claims 1 to 5
3. The seat belt device according to claim 1, wherein the shoulder belt winding device winds the shoulder belt by power other than elastic force when the first external signal is turned on, A seat belt device having a function of locking the drawer of the shoulder belt when the signal of (1) is turned on. 7. One of claims 1 to 5
The seat belt device according to claim, wherein the shoulder belt winding device, when a first external signal is turned on, winds the shoulder belt with power other than elastic force, and after a predetermined time, A seat belt device having a locking function for pulling out a shoulder belt. 8. The seat belt device according to claim 5, wherein the shoulder belt winding device is configured to connect the power generation device and the shoulder belt when a first external signal is turned on. Having a function of locking the pull-out of the shoulder belt when a second signal from the outside is turned on, and the shoulder belt is wound by a power other than elastic force, and the shoulder belt is wound by power other than elastic force. Belt device. 9. The seat belt device according to claim 5, wherein the shoulder belt winding device is configured to connect the power generation device and the shoulder belt when a first external signal is turned on. A seat belt device having a function of locking the shoulder belt by a power other than elastic force and locking a drawer of the shoulder belt after a predetermined time has elapsed. 10. The method of operating a seatbelt device according to claim 6, wherein the first signal and the second signal are provided by a human operation, respectively. An operation method for a seat belt device, characterized by comprising: 11. The operating method of the seat belt device according to claim 6, wherein a state of the vehicle is detected, and the first signal is detected according to the state. A method for operating a seat belt device, wherein the second signal is automatically given.