Torque transmission mechanism

Abstract

To provide a torque transmission mechanism that does not use internal pins that are prone to breakage. [Solution] The torque transmission mechanism 100 comprises a first member 130, an input section 20 that causes the first member 130 to reciprocate, a second member 150 provided with a zigzag-shaped groove 152, a rolling member 170 held by the first member 130 and configured to slide or roll within the groove 152, and a holding member 180 that holds the second member 150 so as to be rotatable around the output rotation axis AX, wherein the first member 130 allows the rolling member 170 to move along the output rotation axis AX and restricts the movement of the rolling member 170 around the output rotation axis AX.

Description

Technical Field

[0001] The present invention relates to a torque transmission mechanism.

Background Art

[0002] Regarding torque transmission mechanisms, Patent Document 1 discloses an eccentric swing type reduction mechanism. In the reduction mechanism of Patent Document 1, torque transmission is achieved by transmitting the rotation component of the external gear to the carrier body via an inner pin.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology of Patent Document 1, during the operation of the mechanism, a shear load is generated on the inner pin responsible for torque transmission, which may cause the inner pin to break.

Means for Solving the Problems

[0005] The torque transmission mechanism includes a first member having a cylindrical shape and configured to be reciprocally movable along an output shaft, an input portion that converts the rotation of an input shaft intersecting the output shaft into a reciprocating motion and reciprocates the first member, a second member having an annular shape surrounding the first member and configured to be rotatable around the output shaft, the second member having an inner peripheral surface provided with a zigzag groove portion extending around the output shaft, a rolling member held by the first member and configured to be slidable or rollable within the groove portion, and a holding member disposed on the outer periphery of the second member and holding the second member rotatably around the output shaft. The first member allows movement of the rolling member along the output shaft and restricts movement of the rolling member around the output shaft.

Brief Description of the Drawings

[0006] [Figure 1] A perspective view showing the schematic configuration of the torque transmission mechanism in the first embodiment. [Figure 2] Section III-III in Figure 1. [Figure 3] Sectional view IV-IV in Figure 1. [Figure 4] A first explanatory diagram of the operation of the torque transmission mechanism in the first embodiment. [Figure 5] A second diagram illustrating the operation of the torque transmission mechanism in the first embodiment. [Figure 6] A cross-sectional view showing the schematic configuration of the torque transmission mechanism in the second embodiment. [Modes for carrying out the invention]

[0007] A. First Embodiment: Figure 1 is a perspective view showing the schematic configuration of the torque transmission mechanism 100 in the first embodiment. Figure 2 is a cross-sectional view taken along line III-III in Figure 1. Figure 3 is a cross-sectional view taken along line IV-IV in Figure 1. Figure 1 shows arrows indicating the mutually orthogonal X, Y, and Z directions. The X and Y directions are parallel to the horizontal plane, and the Z direction is along the vertically upward direction. In other figures, arrows indicating the X, Y, and Z directions are shown as appropriate, so that the directions shown correspond to those in Figure 1. In the following description, when specifying the direction, the direction indicated by the arrow in each figure will be denoted as "+" and the opposite direction as "-", and positive and negative signs will be used in the direction notation. Hereafter, the +Z direction will also be referred to as "up" and the -Z direction as "down".

[0008] In this embodiment, the torque transmission mechanism 100 is configured as a torque transmission device. As shown in Figures 1 to 3, the torque transmission mechanism 100 comprises a first member 130, a second member 150, a rolling member 170, an input unit 20, a holding member 180, and a bearing unit 201. The torque transmission mechanism 100 outputs rotation around the Y axis as rotation around the Z axis. In this embodiment, the input unit 20 uses a "slider-crank mechanism" to convert rotation BD1 around the Y axis into reciprocating motion SL along the Z axis, and the rotating unit 10 converts it back into rotation around the Z axis for output. In this disclosure, "cylindrical shape" includes both solid cylindrical shapes and hollow cylindrical shapes. Furthermore, rotation around the Z axis is rotation around the output rotation axis AX. Hereinafter, the direction along the output rotation axis AX will also be referred to as the output rotation axis AX direction.

[0009] The input unit 20 consists of a crank unit 21 and a connecting rod 22. The torque input to the torque transmission mechanism 100 is input as rotation around an input shaft 220 parallel to the Y-axis. The input unit 20 converts the rotation of the input shaft 220 into reciprocating motion SL along the Z-axis. That is, the input unit 20 converts the rotation of the input shaft intersecting the output rotation axis AX into reciprocating motion SL.

[0010] The crank section 21 includes an input shaft 220 for inputting rotation, a rod-shaped crank arm 211 that rotates together with the input shaft 220, and a second shaft 240 that transmits power to the connecting rod 22. The input shaft 220 is fixed to one end of the crank arm 211, and the second shaft 240 is fixed to the other end of the crank arm 211. Both the input shaft 220 and the second shaft 240 are parallel to the Y-axis. When the input shaft 220 rotates, the second shaft 240 rotates around the input shaft 220, drawing a circle with a radius equal to the distance between the input shaft 220 and the second shaft 240.

[0011] The connecting rod 22 is a rod-shaped connecting member. A second shaft hole 2401 is formed at one end of the connecting rod 22, and a first shaft hole 2301 is formed at the other end of the connecting rod 22. The connecting rod 22 is connected to the crank section 21 by inserting the second shaft 240 through the second shaft hole 2401. The second shaft 240 is rotatable within the second shaft hole 2401. The connecting rod 22 is also connected to the first shaft 230 of the first member 130. Specifically, the connecting rod 22 is rotatably connected to the first shaft 230 by inserting the first shaft 230 through the first shaft hole 2301. The input shaft 220, the first shaft 230, and the second shaft 240 of the crank section 21 are parallel along the Y axis.

[0012] Since the input unit 20 is configured as described above, when the input shaft 220 is rotationally driven, the input unit 20 causes the first member 130 to perform a reciprocating motion SL along the output rotation shaft AX via the crank unit 21 and the connecting rod 22.

[0013] The first member 130 is a cylindrical member. The central axis of the cylindrical shape coincides with the output rotation axis AX, which is the output axis. The lower side of the first member 130 is hollow. The first shaft 230 is positioned on the lower side of the first member 130 so as to traverse the internal space along the Y axis. As described above, the connecting rod 22 is connected to the first shaft 230. The first member 130, connected to the connecting rod 22, reciprocates along the output rotation axis AX according to the input unit 20, and its movement around the output rotation axis AX is restricted.

[0014] Multiple retaining portions 132 are formed on the upper side of the first member 130. The retaining portions 132 are recesses formed so as to be recessed from the outer circumferential surface 131 of the first member 130 toward the central axis of the first member 130. In other words, the multiple retaining portions 132 are formed radially along the radial direction of the first member 130. One end of each retaining portion 132 is open at the outer circumferential surface 131, and the other end of the retaining portion 132 is closed by a bottom wall in front of the central axis. A spherical rolling member 170 and an elastic member 171 are arranged in each retaining portion 132. The diameter of the hole in the retaining portion 132 is slightly larger than the diameter of the rolling member 170. The elastic member 171 is located behind the retaining portion 132, that is, inside the retaining portion 132. The rolling member 170 is located outside the elastic member 171. Furthermore, the first member 130 allows the rolling member 170 it holds to move along the output rotation axis AX, while restricting its movement around the output rotation axis AX.

[0015] The rolling member 170 in this embodiment is a stainless steel ball. However, the rolling member 170 is not limited to stainless steel and may be made of other metals. The rolling member 170 may also be made of plastic, but it is desirable that it be made of a material with the highest possible hardness. Furthermore, the surface of the rolling member 170 may be coated for the purpose of hardening.

[0016] In this embodiment, the elastic member 171 is a compression coil spring and is positioned within the holding portion 132 in a compressed state from its free length. One end of the elastic member 171 abuts against the bottom wall of the holding portion 132, and the other end abuts against the rolling member 170. The elastic member 171 biases the rolling member 170 toward the second member 150, which covers the outer circumferential surface 131 of the first member 130. Specifically, the elastic member 171 biases the rolling member 170 toward the groove portion 152 provided on the inner circumferential surface 151 of the second member 150. Note that the elastic member 171 is not limited to a compression coil spring, but may also be a compression conical coil spring, a compression drum-shaped coil spring, a compression barrel-shaped coil spring, etc. Furthermore, the elastic member 171 may also be a hydraulic damper or an elastomer.

[0017] The rolling member 170 is slidable within the holding portion 132 and protrudes outside the opening of the outer peripheral surface 131 due to the biasing of the elastic member 171. That is, the rolling member 170 is arranged so as to span the holding portion 132 and the groove portion 152 of the second member 150.

[0018] The rotating portion 10 is composed of a second member 150, a bearing portion 201, and a holding member 180. The second member 150 is a member having an annular shape. Also, the central axis of the second member 150 is the output rotation axis AX.

[0019] The second member 150 has an annular shape surrounding the first member 130 and is configured to be rotatable around the output rotation axis AX. A groove portion 152 is provided on the inner peripheral surface 151 of the annular shape. The groove portion 152, together with the first member 130, holds the rolling member 170 slidably or rollably. When the rolling member 170 moves within the groove portion 152, the rolling member 170 moves while sliding or rolling. The inner diameter of the second member 150 is larger than the outer diameter of the first member 130. The central axis of the second member 150 coincides with the central axis of the first member 130 and is arranged along the Z direction. The rotation of the second member 150 is output to the outside of the torque transmission mechanism 100 by a connecting member not shown.

[0020] The groove portion 152 has a zigzag shape extending and going around on the inner peripheral surface 151. In this specification, the "zigzag shape" means a shape that extends while reciprocating one or more times in a certain direction and advancing in a direction intersecting that direction. That is, the zigzag shape has one or more turning points. The turning points of the zigzag shape may be sharp or rounded. Details of the groove portion 152 will be described later.

[0021] The circumferential direction DC of the torque transmission mechanism 100 corresponds to the circumferential direction of the second member 150. In the present disclosure, the circumferential direction DC is defined as the counterclockwise direction when viewing the torque transmission mechanism 100 from the +Z direction side. Also, hereinafter, unless otherwise specified, "counterclockwise" means the counterclockwise direction when viewing the torque transmission mechanism 100 from the +Z direction side. The same applies to "clockwise".

[0022] The bearing portion 201 is an annular bearing mechanism disposed between the second member 150 and a holding member 180 to be described later. The bearing portion 201 rotatably holds the second member 150 and the holding member 180. In the present embodiment, a radial type ball bearing is used for the bearing portion 201. The inner race constituting the ball bearing corresponds to the outer peripheral surface of the second member 150. Further, the bearing portion 201 corresponds to the inner peripheral surface of the holding member 180. The inner race and the outer race of the bearing portion 201 are fixed to the second member 150 and the holding member 180 by fitting. As the bearing used for the bearing portion 201, in addition to the radial type ball bearing, a thrust type ball bearing may be used. Also, a radial type rolling bearing may be used, or a thrust type roller bearing may be used. Further, a metal sliding bearing, a plastic sliding bearing, a bearing unit, or the like may be used.

[0023] The holding member 180 is located at the outermost part of the torque transmission mechanism 100, has an annular shape surrounding the second member 150, disposes the bearing portion 201 on the annular inner peripheral surface, and rotatably holds the second member 150. That is, the holding member 180 is disposed on the outer periphery of the second member 150. Since the holding member 180 also plays a role of holding and fixing the torque transmission mechanism 100 itself to an external structure, its appearance is not limited to the annular shape as long as it can hold the bearing portion 201.

[0024] As shown in Figure 2, the rolling member 170 is positioned between the first member 130 and the second member 150, straddling the holding portion 132 and the groove portion 152. The rolling member 170 is configured to move within the groove portion 152 while being held by the holding portion 132. Specifically, the rolling member 170 rolls within the holding portion 132 and the groove portion 152 so that it is positioned where the holding portion 132 and the groove portion 152 intersect when viewed along the radial direction of the torque transmission mechanism 100. As the rolling member 170 moves within the groove portion 152, the rolling member 170 and the second member 150 move relative to each other. As will be described later, the rolling member 170 plays a role in converting reciprocating motion between the first member 130 and the second member 150 into rotational motion.

[0025] In this embodiment, the rolling member 170 is slidably held in the retaining portion 132. The rolling member 170 includes rolling member 170A, rolling member 170B, rolling member 170C, rolling member 170D, rolling member 170E, and rolling member 170F. The retaining portion 132 also includes retaining portion 132A, retaining portion 132B, retaining portion 132C, retaining portion 132D, retaining portion 132E, and retaining portion 132F. Retaining portion 132A holds rolling member 170A, retaining portion 132B holds rolling member 170B, retaining portion 132C holds rolling member 170C, retaining portion 132D holds rolling member 170D, retaining portion 132E holds rolling member 170E, and retaining portion 132F holds rolling member 170F. Furthermore, the number of rolling members 170 is preferably determined by taking into account, for example, the strength of the first member 130. Specifically, the more rolling members 170 there are, the larger the total opening area of ​​each holding portion 132 in the first member 130 becomes, which may reduce the strength of the first member 130. It is preferable to set the number of rolling members 170 to a number that is small enough to suppress such a reduction in strength.

[0026] Figure 4 is a first operational diagram of the torque transmission mechanism 100. Figure 4 shows the outer circumferential surface 131t of the first member 130 and the inner circumferential surface 151t of the second member 150. The outer circumferential surface 131t corresponds to the unfolded outer circumferential surface 131. The inner circumferential surface 151t corresponds to the unfolded inner circumferential surface 151. Figure 4 shows the outer circumferential surface 131t and the inner circumferential surface 151t superimposed. In addition, each holding part 132 is schematically shown by dashed lines in Figure 4. In addition, each rolling member 170 is schematically shown by hatching in Figure 4.

[0027] Figure 4 shows the angles θ at the outer circumferential surface 131 and the inner circumferential surface 151. The angle θ increases as you move in the circumferential direction DC. The 0-degree angular position A0 and the 360-degree angular position A360 shown in Figure 4 are the same position. In this embodiment, the retaining portion 132 is located at angular position A0. In Figure 4, rolling members 170A and retaining portions 132A are shown near angular position A0 and near angular position A360, respectively, to facilitate understanding of the technology. However, in reality, there is only one rolling member 170A and one retaining portion 132A.

[0028] In Figure 4, the groove 152 is shown by a thick line. The groove 152 has a closed ring shape that encircles the inner circumferential surface 151 along the circumferential direction DC. Overall, the groove 152 has a periodic wave shape that moves along the circumferential direction DC while reciprocating along the inner circumferential surface 151 in the Z direction. That is, when the groove 152 is considered as a wave, the direction of propagation of the groove 152 is along the circumferential direction DC, and the direction of vibration of the groove 152 is in the Z direction. Specifically, the groove 152 has a triangular wave shape. The groove 152 has one period. That is, the groove 152 has six peaks 152m and six troughs 152v. The peaks 152m and troughs 152v have a pointed shape. The position of each peak 152m in the Z direction is approximately the same. Also, the position of each trough 152v in the Z direction is approximately the same. In other words, when the groove 152 is considered as a wave, the amplitude of the groove 152 is approximately constant. Each peak 152m and each valley 152v corresponds to the turning point of the zigzag shape described above. In this embodiment, the peak 152m is located on the +Z side of the valley 152v. In other embodiments, the positional relationship between the peak 152m and the valley 152v may be reversed.

[0029] Returning to Figure 3, in this embodiment, the torque transmission mechanism 100 uses a "slider crank mechanism" to convert the rotation BD1 around the Y axis into a reciprocating motion SL along the Z axis.

[0030] The second member 150 converts the reciprocating motion SL of the first member 130 back into rotation around the output rotation axis AX and outputs it. The following describes the operation in which the first member 130 performs reciprocating motion SL according to the rotation BD1 input to the crank unit 21, and the second member 150 outputs rotation around the output rotation axis AX.

[0031] Figure 5 is a second diagram illustrating the operation of the torque transmission mechanism 100. Figure 5 shows that, starting from the state in Figure 4, when the first member 130 performs a reciprocating motion SL along the Z-axis, the second member 150 rotates circumferentially DC around the output rotation axis AX by a rotation angle θ1. For simplicity, only the rolling member 170A is shown in Figure 5 among the rolling members 170. In the example in Figure 5, the rotation angle θ1 is 30 degrees.

[0032] As the first member 130 performs a reciprocating motion SL along the Z-axis, each rolling member 170 moves within the groove 152. Specifically, when a rotation BD1 is input to the input shaft 220 (see Figure 3) and the crank section 21 rotates, the crank arm 211 causes the second shaft 240 to trace the trajectory of the rotation BD1. The second shaft 240 is connected to the first shaft 230 of the first member 130 by a connecting rod 22. Because the first shaft 230 of the first member 130 is connected to the connecting rod 22, when the first member 130 reaches the lower end in the Z-axis direction of the trajectory of the rotation BD1 traced by the second shaft 240, it becomes the lower end SLa of the reciprocating motion SL along the Z-axis. Also, when the second shaft 240 reaches the upper end in the Z-axis direction of the trajectory of the rotation BD1 traced by the second shaft 240, it becomes the upper end SLb of the reciprocating motion SL along the Z-axis. In other words, the reciprocating motion SL of the first member 130 along the Z axis is the reciprocating motion between the lower end SLa and the upper end SLb of the first shaft 230. Returning to Figure 5, the starting point S1 of the rolling member 170A is the position rotated to the upper end SLb on the trajectory of the rotation BD1 traced by the second shaft 240, and the ending point E1 corresponds to the lower end SLa. As the first member 130 performs the reciprocating motion SL along the Z axis, each rolling member 170 moves along the path Pt within the groove 152. The path Pt is a path whose length in the circumferential direction DC corresponds to the rotation angle θ1 of the second member 150. Specifically, the path Pt is a path whose starting point S1 is the position of the rolling member 170A before the start of the reciprocating motion SL of the first member 130 along the Z axis, and its ending point E1 is the position advanced in the circumferential direction DC from the starting point S1 by the amount corresponding to the rotation angle θ1. As the rolling member 170A rolls along the path Pt, it moves within the groove 152 only in the -Z direction, following a reciprocating motion SL along the Z axis. As a result, the position of the rolling member 170A in the circumferential direction DC does not change, while the second member 150 rotates along the circumferential direction DC. That is, the second member 150 rotates around the output rotation axis AX, and torque is transmitted.

[0033] As described above, the torque transmission mechanism 100 in this embodiment converts the torque input to the input unit 20 from rotational motion BD1 to reciprocating motion SL by the input unit 20 and the first member 130, and then converts it back to rotation around the output rotation axis AX by the second member 150 for transmission. Therefore, no shear load is generated on the internal pin responsible for torque transmission, and the risk of the internal pin breaking is prevented in advance. Furthermore, it is possible to provide a torque transmission mechanism in which the input shaft 220 and the output rotation axis AX are orthogonal with a simple configuration.

[0034] Furthermore, according to the torque transmission mechanism 100 in this embodiment, the torque transmission mechanism 100 can convert the rotational BD1 into reciprocating motion SL by using the crank section 21 and the connecting rod 22 to receive the torque input to the input section 20.

[0035] Furthermore, according to the torque transmission mechanism 100 of this embodiment, by further including an elastic member 171 that biases the rolling member 170 toward the groove portion 152, it becomes possible to transmit torque more reliably.

[0036] Furthermore, according to the torque transmission mechanism 100 in this embodiment, the rolling member 170 includes one rolling member 170A and another rolling member 170B. When torque is transmitted from the first member 130 to the second member 150, torque is transmitted by multiple rolling members 170. This reduces the load on a single rolling member 170, preventing deterioration or damage to the rolling member 170.

[0037] Furthermore, according to the torque transmission mechanism 100 of this embodiment, the bearing portion 201 is provided between the second member 150 and the holding member 180, allowing the second member to rotate more smoothly.

[0038] B. Second Embodiment: Figure 6 is a cross-sectional view showing the schematic configuration of the torque transmission mechanism 100b in the second embodiment. As shown in Figure 6, in this embodiment, unlike the first embodiment, the input section 20 has a cam structure with the first member 130 as the drive. The torque transmission mechanism 100b in this embodiment consists of a rotating section 10, an input section 20, a biasing section 40, and a second holding member 181. The torque transmission mechanism 100b in this embodiment is the same as in the first embodiment unless otherwise described.

[0039] In this embodiment, the input unit 20 configured in the first embodiment is a cam unit 30. The cam unit 30 is responsible for inputting rotation BD1. The cam unit 30 consists of a cam 310, an input shaft 320, and a first member 130a.

[0040] The cam 310 is a disc-shaped member that rotates integrally with the input shaft 320. The outer circumference of the cam 310 is composed of multiple curved surfaces whose distance from the input shaft 320 changes continuously, and functions as a driving link that generates a reciprocating motion SL parallel to the Z-axis direction, which moves back and forth between the lower end SLa and the upper end SLb, in the driven portion 133 of the first member 130a, which will be described later and contacts the cam portion 300.

[0041] The input shaft 320 is an input part that rotates the cam section 30, and is connected to an external device of the torque transmission mechanism 100b to receive the rotation BD1.

[0042] The first member 130a is the first member 130 in the first embodiment with the first shaft 230 removed, and has a driven part 133 that contacts the outer circumference of the cam 310 and converts itself into a reciprocating motion SL according to the outer circumference of the cam part 30.

[0043] The biasing portion 40 is a compression coil spring and is positioned in the +Z direction of the first member 130a. One end of the biasing portion 40 abuts against the upper surface of the first member 130a, and the other end of the biasing portion 40 abuts against a second retaining member 181 positioned in the +Z direction of the biasing portion 40. The second retaining member 181 may be fixed to the retaining member 180 or may be integrally formed with the retaining member 180. The biasing portion 40 biases the first member 130a in the -Z direction, pressing the first member 130a against the cam 310. The cam portion 30 can push the first member 130a upward against the biasing force of the biasing portion 40. Note that the biasing portion 40 is not limited to a compression coil spring; a compression conical coil spring, a compression drum-shaped coil spring, a compression barrel-shaped coil spring, etc., may also be used. Furthermore, a hydraulic damper or elastomer may be used for the biasing portion 40.

[0044] As described above, the torque transmission mechanism 100b of the second embodiment can obtain the same effects as the torque transmission mechanism 100 of the first embodiment.

[0045] (1) According to a first embodiment of the present disclosure, a torque transmission mechanism is provided. The torque transmission mechanism comprises: a first member having a cylindrical shape and configured to reciprocate along an output shaft; an input unit that converts the rotation of an input shaft intersecting the output shaft into reciprocating motion and causes the first member to reciprocate; a second member having an annular shape surrounding the first member and configured to be rotatable around the output shaft, the second member having an inner circumferential surface provided with a zigzag groove extending around the output shaft; a rolling member held by the first member and configured to slide or roll within the groove; and a holding member disposed on the outer circumference of the second member and holding the second member so as to be rotatable around the output shaft, wherein the first member allows the rolling member to move along the output shaft and restricts the rolling member's movement around the output shaft. In this configuration, the torque transmission mechanism converts the torque input to the input section from rotational motion to reciprocating motion by the input section and the first member, and then converts it back to rotational motion by the second member for transmission. As a result, no shear load is generated on the internal pin responsible for torque transmission, and the risk of the internal pin breaking is prevented. Furthermore, it becomes possible to provide a torque transmission mechanism where the input shaft and output shaft intersect with a simple configuration.

[0046] (2) In the above embodiment, the input unit comprises a crank unit having the input shaft and a connecting rod connected to the crank unit and the first member, wherein the connecting rod is rotatably connected to the first member via a first shaft parallel to the input shaft and rotatably connected to the crank unit via a second shaft parallel to the input shaft. With this configuration, the torque transmission mechanism converts the torque input to the input unit into reciprocating motion by using the crank unit and the connecting rod.

[0047] (3) The above embodiment is characterized by further comprising an elastic member that biases the rolling member toward the groove. With this configuration, the torque transmission mechanism can transmit torque more reliably by further comprising an elastic member that biases the rolling member toward the groove.

[0048] (4) In the above embodiment, the rolling member is characterized by including one rolling member and other rolling members. With this configuration, the torque transmission mechanism includes one rolling member and other rolling members, and when torque is transmitted from the first member to the second member, torque is transmitted by multiple rolling members, so that the load on one rolling member is reduced and deterioration or damage to the rolling member can be prevented.

[0049] (5) The above embodiment is further characterized by comprising a bearing disposed between the outer circumferential surface of the second member and the inner circumferential surface of the retaining member. With this configuration, the second member can rotate more smoothly by having a bearing between the second member and the retaining member. [Explanation of Symbols]

[0050] Pt...path, 10...rotating part, 20...input part, 21...crank part, 22...connecting rod, 30...cam part, 40...biasing part, 100,100b...torque transmission mechanism, 130,130a...first member, 131,131t...outer surface, 132...holding part, 132A,132B,132C,132D,132E,132F...holding part, 133...driven part, 150...second member, 151...inner surface, 151t...inner surface, 152...groove part, 152m...ridge part, 152v... Valley section, 170, 170A, 170B, 170C, 170D, 170E, 170F... Rolling member, 171... Elastic member, 180... Retaining member, 181... Second retaining member, 201... Bearing section, 211... Crank arm, 220... Input shaft, 230... First shaft, 240... Second shaft, 300... Cam section, 310... Cam, 320... Input shaft, 2301... First shaft hole, 2401... Second shaft hole, A360... Angular position, BD1... Rotation, E1... End point, S1... Start point.

Claims

1. A first member having a cylindrical shape and configured to reciprocate along the output shaft, An input unit that converts the rotation of an input shaft intersecting the output shaft into reciprocating motion, thereby causing the first member to reciprocate; A second member having an annular shape surrounding the first member and configured to be rotatable around the output shaft, the second member having an inner circumferential surface provided with a zigzag-shaped groove extending around the output shaft, A rolling member, which is held by the first member and configured to slide or roll within the groove, The second member comprises a holding member positioned on the outer circumference of the second member and holding the second member so as to be rotatable around the output shaft, A torque transmission mechanism characterized in that the first member allows the rolling member to move along the output shaft and restricts the rolling member's movement around the output shaft.

2. A torque transmission mechanism according to claim 1, The input unit includes a crank section having the input shaft and a connecting rod connected to the crank section and the first member. The torque transmission mechanism is characterized in that the connecting rod is rotatably connected to the first member via a first axis parallel to the input shaft, and rotatably connected to the crank portion via a second axis parallel to the input shaft.

3. A torque transmission mechanism according to claim 1, A torque transmission mechanism further comprising an elastic member that biases the rolling member toward the groove.

4. A torque transmission mechanism according to claim 1, The torque transmission mechanism is characterized in that the rolling member includes one rolling member and another rolling member.

5. A torque transmission mechanism according to claim 1, A torque transmission mechanism further comprising a bearing disposed between the outer circumferential surface of the second member and the inner circumferential surface of the retaining member.

Images