JP2018091448A - Shaft coupling, damper device, and impact torque reduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft coupling which effectively improves durability by acquiring required sufficient strength while realizing a simple configuration, and a damper device employing the shaft coupling and an impact torque reduction device.SOLUTION: A shaft coupling 1 comprises: a cam follower member 22 which is energized in a prolongation direction by a piston 23 of an elongation/contraction member being configured to be elongated/contracted while being disposed in a proximal end side member 2 being one member of the proximal end side member 2 and a distal end side member 3 that are two members being rotated relatively; and a cam member 32 which is integrally provided in the distal end side member 3 of the other member so as to be abutted to the cam follower member 22 at all the time. The shaft coupling 1 is configured to increase/decrease braking force to relative rotation between the two members by elongating/contracting the piston 23 via the cam follower member 22 with the rotations while abutting the cam follower member 22 to a cam surface of the cam member 32. During operation in which the proximal end side member 2 and the distal end side member 3 are relatively rotated, a direction of actuation force X that is applied from the cam member 32 through the cam follower member 22 is not changed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a shaft coupling, a damper device, and an impact torque reduction device for increasing or decreasing a braking force for rotation when the other member rotates relative to one member.

  Conventionally, in a shaft coupling to which an input shaft and an output shaft constituting a rotation transmission system are coupled, and a damper device used for a sliding door and an opening / closing lid, when the two members rotate relatively, It may be used for the purpose of giving a braking force to the movement to brake the rotation or giving the rotation a heavy feeling. In such a case, the shaft coupling and the damper device employ a mechanism corresponding to each purpose. As an example of this type of shaft coupling, there is a shaft coupling shown in Patent Document 1.

  According to the above-described shaft coupling and damper device, if a sudden rotation occurs between the two members, the rotation is braked or a sense of weight is given to the gentle rotation between the members. Each effect is obtained.

  In the shaft joint described in Patent Document 1 described above, the cam follower member that is urged in the extension direction by the expansion / contraction member that is disposed on one of the two members that rotate relatively and is configured to be extendable / contracted, and the other member And a cam member that is provided so as to always contact the cam follower member.The cam follower member is brought into contact with the cam surface of the cam member, and the cam follower member is moved by relative rotation between the two members. The expansion and contraction member is expanded and contracted through the brake, and the braking force to the rotation is increased or decreased.

Japanese Patent Laid-Open No. 2006-114123

  However, the direction of the acting force acting from the cam member to the cam follower member is arranged to gradually move from the operation start end to the end. Then, the strength design for installing the cam follower member must be set in consideration of the acting force in all directions pressed from the cam member. In other words, it means that it must be set stronger than necessary in order to secure the strength of the place where the expandable member and the cam follower member are fixed and arranged.

  An object of the present invention is to solve the above-described problem, and to provide a shaft coupling that can be used for an impact torque reduction device and a damper device, and that can appropriately cope with an acting force while having a simple configuration. That is.

  In order to achieve this object, the present invention takes the following measures.

  The shaft coupling according to the present invention is provided integrally with a cam follower member which is arranged in one of two relatively rotating members and is urged in an extension direction by an expansion / contraction member configured to be extendable / contracted, and the other member. A cam member provided so as to always abut against the cam follower member, the cam follower member is brought into contact with the cam surface of the cam member, and the cam follower member is interposed by relative rotation between the two members. A shaft coupling configured to expand or contract the telescopic member to increase or decrease the turning force, and the cam follower moves from the cam follower during an operation in which the two members rotate relatively. The direction of the acting force applied through the member is not changed.

  In such a case, the direction of the force acting from the cam member does not change, and therefore, when the cam follower member is arranged, the strength design can be performed by taking into consideration only the one-way acting force acting from the cam member. it can. As a result, it is possible to provide a shaft coupling that achieves a necessary and sufficient strength while effectively improving durability while realizing a simple configuration.

  In order to further improve the durability of the shaft coupling, it is desirable to configure the direction of the acting force to coincide with the expansion / contraction direction of the expansion / contraction member.

  In addition, as a specific configuration for stably realizing smooth rotation, two cam follower members are provided at point-symmetric positions at a position sandwiching the center line of relative rotation with the cam member, A configuration in which a cam member is arranged for each cam follower member can be given.

  Further, in order to realize a configuration that can suitably cope with both forward and reverse rotations, the cam member has a cam surface corresponding to both forward and reverse rotations of the cam follower member, and the cam follower member is It is desirable to be positioned in contact with the vicinity of the center of the cam surface.

  Further, as a specific example that can suitably cope with both forward and reverse rotations, a pair of cam follower members biased preferentially from the cam surface at the time of forward rotation and reverse rotation is applied to one telescopic member. Can be mentioned.

  The above-described shaft coupling according to the present invention can be suitably used as a component of a damper device or an impact torque reduction device.

  The present invention can provide a shaft coupling that achieves a necessary and sufficient strength while effectively improving durability while realizing a simple configuration.

The front view which concerns on one Embodiment of this invention. FIG. The right side view. The bottom view. The external view of the principal part which concerns on the same embodiment. Structure explanatory drawing which concerns on the same embodiment. Operation | movement explanatory drawing which concerns on FIG. Explanatory drawing which concerns on the modification of the embodiment. Explanatory drawing which concerns on the other modification of the embodiment. Explanatory drawing which concerns on the other modification of the embodiment.

  Hereinafter, a shaft coupling 1 according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 7, the shaft coupling 1 is used to connect a drive shaft of a rotation drive source (not shown) and a transmission shaft of an example of a driven member as an example of a drive side member of a rotation transmission system. It can be suitably used as one member constituting a damper device or an impact torque reduction device.

  The shaft coupling 1 includes a proximal end member 2 having an input shaft 21 into which a drive shaft is fitted, and a distal end side member 3 having an output shaft 31 to which a transmission shaft is coupled.

  Here, the shaft coupling 1 according to the present embodiment is disposed on the proximal end side member 2 which is one of the proximal end side member 2 and the distal end side member 3 which are two relatively rotating members, and is expanded and contracted. A cam follower member 22 that is urged in the extending direction by a piston 23 that is an extendable member that can be configured, and a cam that is provided integrally with the tip member 3 that is the other member and is always in contact with the cam follower member 22 The cam follower member 22 is brought into contact with the cam surface 33 of the cam member 32, and the piston 23 is expanded and contracted via the cam follower member 22 by relative rotation between the two members. The shaft coupling 1 is configured to increase or decrease the braking force of the base end side member 2 and the distal end side member 3 through the cam follower member 22 from the cam member 32 during the operation of the relative rotation. In addition Characterized in that the direction of the acting force X unchanged to.

  Hereinafter, a specific configuration of the shaft coupling 1 will be described.

  The base end side member 2 includes an input shaft 21, a cam follower member 22 that can rotate around the axis together with the input shaft 21, a piston 23 that supports the cam follower member 22 so as to be able to advance and retreat, and a base end of the piston 23. A piston support member 24 that directly or indirectly fixes the side to the input shaft 21.

  The input shaft 21 is provided with an input hole 21a which is located at the center of the input shaft 21 and has a substantially square shape when viewed from the bottom. However, the configuration of the input shaft 21 is not limited to the input hole 21a, and various shapes can be appropriately selected according to the configuration of a driving source (not shown) on the input side.

  In this embodiment, two cam follower members 22 are provided at positions that are point-symmetric with respect to the axis S <b> 1 that is the center line of relative rotation with the cam member 32, and each cam follower member 22 is cammed. The member 32 is arranged. The cam follower member 22 includes a roller 25 that can slide and roll with respect to the cam member 32 and a roller support portion 26 that rotatably supports the roller 25.

  The piston 23 includes a cylinder 27 having a substantially cylindrical shape in which the cam follower member 22 is fixed to the distal end side, and a piston rod 28 that can reciprocate along the extending direction of the cylinder 27 from the base end side of the cylinder 27. Have. In other words, the piston rod 28 is configured to be operable so that a part thereof can protrude and retract from the inside of the cylinder 27 along the longitudinal direction of the cylinder 27. For example, a pair of cylinder chambers are arranged inside the cylinder 27, and the paired cylinder chambers are filled with viscous fluid, and the viscous fluid moves appropriately as the piston rod 28 moves. ing. A coil spring (not shown), which is an elastic member that elastically urges the piston rod 28 in the extending direction, is provided inside the cylinder 27. With these configurations, the piston rod 28 can move faster when moving forward than when moving backward. Moreover, the viscous fluid can change the speed which moves between the above-mentioned cylinder chambers suitably with the viscosity. That is, by adjusting the viscosity of the viscous fluid, the braking force for the relative operation between the piston rod 28 and the cylinder 27 can be set to an arbitrary magnitude. The piston rod 28 has a rod body 28a having a rod shape that can project and retract with respect to the cylinder 27, and a fixed end 28b that is provided at the base end of the rod body 28a and is fixed to the input shaft 21 side. Yes.

  The piston support member 24 is for engaging with the distal end side member 3 so as to be able to rotate relative to the distal end side member 3 while fixing the proximal end side of the piston 23 described above. The piston support member 24 has a protrusion 29 that protrudes toward the distal end side in order to engage with the distal end side member 3 so as to be able to rotate relative to the distal end side member 3.

  The distal end side member 3 has an output shaft 31 and a cam member 32 provided integrally with the output shaft 31. As shown in FIGS. 1 to 3, the output shaft 31 includes a connecting portion 31 b extending to a position where it is connected to a component on the distal end side, and an engagement hole 31 a formed in the connecting portion 31 b.

  The cam member 32 is provided integrally with the output shaft 31 or fixed so as to be able to operate integrally with the output shaft 31. The cam member 32 accommodates a cam surface 33 formed so as to be always in contact with the roller 25, and a projection 29 provided on the piston support member 24 described above. It has a guide groove 34 that guides it so that it can rotate relatively.

  Further, each cam member 32 has a cam surface 33 which is a circular arc having a point-symmetric shape with respect to the axis S1 of the output shaft 31, and this circular arc is output shaft toward one direction shown in FIG. It has a shape that gradually approaches 31 axis S1. The roller 25 of the cam follower member 22 held by the input shaft 21 is always in contact with the cam surface 33 of the cam member 32, and the pressing force of the piston 23 is constantly applied from the roller 25 to the cam surface 33. Therefore, the piston 23 has a braking force against both rotations that enables the output shaft 31 and the input shaft 21 to rotate relative to each other or integrally rotate.

  The operation of the shaft coupling 1 will be described with reference to FIGS. When the input shaft 21 receives the rotation of the drive shaft of the rotational drive source and rotates in one direction, the cam follower member 22 rotates around the axis S <b> 1 of the input shaft 21 together with the input shaft 21. Along with the rotation of the cam follower member 22, the cam member 32 having a cam portion rotates integrally with the cam follower member 22 by the braking force of the piston 23 applied to the roller 25 of the cam follower member 22, and the output shaft 31 together with the input shaft 21. It can rotate in one direction.

  Further, the shaft coupling 1 according to the present invention can give a sense of weight to the relative rotation when a gentle relative rotation occurs between the input shaft 21 and the output shaft 31. While it can be used as a damper device for equipment, on the other hand, when a sudden relative rotation occurs between the input shaft 21 and the output shaft 31, the generation of a sudden impact torque of the output shaft 31 during the screw tightening operation can be reduced. It can be used as an impact torque reduction device suitable for screw tightening work. Furthermore, since the shaft coupling 1 includes components such as the cam follower member 22, the piston 23, and the cam member 32 as described above, the components of the damper device and the impact torque reduction device are made common to reduce the cost. Can be reduced.

  In addition, when the load on the driven side increases and the rotation of the transmission shaft and the output shaft 31 decreases while the input shaft 21 and the output shaft 31 rotate integrally, the direction of applying braking to the rotation of the input shaft 21 is reduced. Rotational torque is generated. When the rotational force due to this rotational torque becomes larger than the braking force acting between the cam surface 33 of the cam member 32 and the roller 25 of the cam follower member 22, a relative rotation between the input shaft 21 and the output shaft 31 is caused. The output shaft 31 rotates with respect to the input shaft 21, and a phase difference is generated between the two shafts. At this time, since the cam surface 33 of the cam member 32 is relatively rotated by the rotation, the roller 25 of the cam follower member 22 relatively moves along the cam surface 33. As a result, the input shaft 21 and the output shaft 31 are relatively rotated while the roller 25 and the piston rod 28 elastically biased in the cylinder 27 of the piston 23 holding the roller 25 are relatively retracted.

  Here, in the shaft coupling 1 according to the present embodiment, the direction of the acting force X coincides with the expansion / contraction direction Y of the piston 23. In other words, the direction of the force acting from the cam surface 33 matches the operating direction of the piston 23.

  In addition, the two cam follower members 22 are arranged in a point-symmetrical position so as to be freely reciprocated in a straight line and sandwiching the axis S <b> 1 of the input shaft 21. With this arrangement, the rotational balance of the input shaft 21 is maintained.

  Although not shown, the means for biasing the cam follower member 22 may be only a coil spring, and the input shaft 21 and the output shaft 31 may be used so that the driving side and the driven side are reversed.

  As described above, the shaft coupling 1 according to the present embodiment has the acting force X applied from the cam member 32 through the cam follower member 22 during the operation in which the distal end side member 3 and the proximal end side member 2 are relatively rotated. The direction is not changed, that is, the acting force X is maintained in a constant direction.

  With this configuration, in this embodiment, the direction of the force acting from the cam member 32 does not change. Therefore, when the cam follower member 22 is arranged, a strength design that takes into account only the one-way acting force X acting from the cam member 32 is taken into account. Is realized. As a result, the shaft coupling 1 that achieves a necessary and sufficient strength and effectively improves durability while realizing a simple configuration is realized.

  In particular, in order to make it possible to further improve the durability of the shaft coupling 1, in the present embodiment, the direction of the acting force X is configured to match the expansion / contraction direction Y of the piston 23 that is an expansion / contraction member.

  In the present embodiment, as a specific configuration for stably realizing smooth rotation, the cam follower member 22 is point-symmetric at a position sandwiching the center line of relative rotation between the cam member 32 and the cam member 32. A configuration in which two cam members 32 are provided at each position and a cam member 32 is arranged for each cam follower member 22 is applied.

  <Modification>

  Hereinafter, each modification of the present embodiment will be described in detail. In the modified example, components corresponding to the components of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the above-described embodiment, the cam member 32 corresponds to only the forward rotation direction of the cam follower member 22 and discloses the shaft coupling 1 that cannot move in the reverse rotation direction from the operation start end. However, it is needless to say that the cam follower member 22 has a cam surface 33 corresponding to the forward rotation and the reverse rotation of the cam follower member 22, and the cam follower member 22 is located in contact with the vicinity of the center of the cam surface 33. That is, in the shaft coupling 1 shown in FIG. 8, the cam members 32 are arranged so that the four cam follower members 22 provided on the plane orthogonal to the extending direction of the shaft core S1 can move favorably in both the forward and reverse directions. The input shaft 21 and the output shaft 31 can be suitably rotated relative to each other in both the forward direction and the reverse direction.

  Further, as shown in FIG. 9, in the above-described embodiment and the modification, the configuration in which one piston 23 is supported with respect to one cam follower member 22 is disclosed. Of course, the number of cam follower members 22 and pistons 23 is matched. The present invention is not limited to the embodiment.

  That is, the shaft coupling 1 shown in FIG. 9 is provided with a pair of rollers 25, 25 that are biased from the cam surface 33 preferentially during forward and reverse operations, with respect to one piston 23. Moreover, if it is the structure provided only on the axial center S1, if it is the piston 23 shown to the same figure, the shaft coupling 1 similar to the said embodiment can be implement | achieved suitably.

  In the above embodiment, only the mode in which the cam member 32 and the cam follower member 22 are arranged in a plane perpendicular to the center line of the relative rotation between the cam follower member 22 and the cam member 32 is disclosed. As shown in FIG. 2, the cam follower member 22 is plural in the direction along the axis S1, which is the center line of the relative rotation with the cam member 32, in other words, the cam follower member in a plurality of layers in the direction in which the axis S1 extends. It is good also as an aspect in which 22 is arranged.

  With such a configuration, the radial dimension of the shaft coupling 1 can be efficiently reduced, and a more compact shaft coupling 1 can be provided in the same direction.

  Although one embodiment of the present invention has been described above, the specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In the above-described embodiments, only the mode for disclosing the mode in which the shaft coupling is applied as a member constituting the damper device or the impact torque reduction device is disclosed. Of course, the shaft coupling is configured to preferably fasten the components. It does not interfere with the aspect of constituting as a part of the made component fastening machine. Further, the detailed configuration such as the specific direction in which the cam follower member and the cam member are engaged and the specific surface shape of the cam surface can be variously modified without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Shaft coupling 2 ... Two members (base end side member)
22 ... Cam follower member 23 ... Expandable member (piston)
3. Two members (tip side member)
32 ... Cam member 33 ... Cam surface S1 ... Center line of rotation X ... Action force Y ... Extension / contraction direction

Claims (8)

A cam follower member which is arranged in one of two relatively rotating members and is urged in an extending direction by an elastic member configured to be extendable;
A cam member provided integrally with the other member and provided so as to always contact the cam follower member,
The cam follower member is brought into contact with the cam surface of the cam member, and the telescopic member is expanded and contracted via the cam follower member by relative rotation between the two members, so that the braking force to the rotation is increased or decreased. A shaft coupling configured to:
A shaft coupling, wherein a direction of an acting force applied from the cam member via the cam follower member does not change during an operation in which the two members rotate relatively. The shaft coupling according to claim 1, wherein the direction of the acting force coincides with the expansion / contraction direction of the expansion / contraction member. 2. The cam follower members are provided at two point-symmetrical positions across a center line of relative rotation with the cam member, and the cam members are disposed with respect to the cam follower members. The shaft coupling according to 1 or 2. 4. The cam member according to claim 1, wherein the cam member has a cam surface corresponding to the forward rotation and the reverse rotation of the cam follower member, and the cam follower member is positioned in contact with the vicinity of the center of the cam surface. Shaft coupling. The shaft coupling according to any one of claims 1 to 4, wherein a pair of cam follower members that are urged from the cam surface preferentially during forward and reverse operations are provided with respect to one of the telescopic members. . The shaft coupling according to claim 1, wherein a plurality of the cam follower members are arranged in a direction along a center line of relative rotation with the cam member. A damper device comprising the shaft coupling according to any one of claims 1 to 6. An impact torque reduction device comprising the shaft coupling according to any one of claims 1 to 6.

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