Speed ​​transmission mechanism of two-way automatic transmission device

Abstract

The present invention provides a speed transmission mechanism for a two-way automatic transmission device, which belongs to the technical field of transmissions. It solves the problem of high cost of existing speed transmission mechanisms. The speed transmission mechanism of the two-way automatic transmission device includes a main shaft, an input member axially fixed outside the main shaft, and a coupling member sleeved on the main shaft and threadedly connected to the input member. A friction member that can form a rotational resistance is provided on the outer side of the coupling member. The friction member is made of a strip of metal sheet. The friction member has an elastic action part and a matching part formed by bending. The friction member can be circumferentially fixed with the housing of the two-way automatic transmission device through the matching part. The elastic action part abuts against the outer wall of the coupling member, and the elastic force of the elastic action part acts inward on the coupling member. The speed transmission mechanism of the two-way automatic transmission device has the advantages of low manufacturing cost and strong wear resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of transmissions, and relates to a bidirectional automatic transmission device, and in particular to a speed transmission mechanism of the bidirectional automatic transmission device. Background Art

[0002] The traditional two-way automatic speed-changing motor realizes the forward or backward movement of the electric tricycle through the cooperation of the one-way clamp and the forward one-way device and the backward one-way device. However, this structure has problems such as non-compact structure, scattered distribution of parts, and excessive space occupation. To this end, the applicant has improved the traditional structure and proposed a two-way automatic speed-changing motor transmission device with patent application number 201610662924.7, which greatly reduces the space occupied by the entire transmission device and makes the entire structure simpler, but it has relatively high requirements for the cooperation between parts, especially when switching between forward and backward, it is easy to fail to switch due to poor cooperation.

[0003] In order to solve the above problems, the applicant made changes to the original technology and proposed a reverse transmission mechanism of a two-way automatic transmission device with patent application number 201911101268.3, which includes a main shaft, a transmission member sleeved on the main shaft and capable of forming a linkage relationship with the main shaft, and an input member axially fixed on the main shaft, a clutch structure is provided between the transmission member and the input member, which can make the two members linked or disengaged along the circumferential direction, a coupling member is sleeved on the main shaft, and when the coupling member moves up and down, the clutch structure can switch between the circumferential linkage and disengagement of the transmission member and the input member, the coupling member is threadedly connected to the input member, the inner circumferential surface of the input member is provided with an arc groove, the outer side of the coupling member is provided with a convex head, and the convex head is located in the arc groove. When switching from forward to reverse, the input member receives power and rotates in the opposite direction relative to the transmission member. Since the input member is threadedly connected to the coupling member, and the convex head on the outer side of the coupling member is located in the arc groove of the input member, the input member can rotate relative to the coupling member through the cooperation between the arc groove and the convex head, which will drive the coupling member to move upward along the thread and switch the clutch structure to the transmission member and the input member in circumferential linkage, so that the transmission member also starts to rotate in the opposite direction, thereby driving the main shaft to rotate in the opposite direction to achieve reverse.

[0004] In the process of switching from forward to reverse, the convex head and the arc groove have relative movement. Since the input member is threadedly connected to the coupling member, it is necessary to apply rotational resistance on the outside of the coupling member to ensure that the coupling member can move upward smoothly. To this end, the reverse transmission mechanism of the above-mentioned two-way automatic transmission device is sleeved with a positioning ring on the outside of the coupling member. The positioning ring and the housing of the two-way automatic transmission device are circumferentially fixed. At the same time, a friction structure composed of a spring and a steel ball is arranged between the positioning ring and the coupling member. The steel ball is pressed against the outside of the coupling member to form rotational resistance to ensure that the coupling member can move upward smoothly. However, the combined structure of the positioning ring, steel ball and spring leads to a relatively high production cost. In view of this situation, a more conventional method for those skilled in the art is to use relatively cheap materials to manufacture the positioning ring. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and propose a speed transmission mechanism for a bidirectional automatic speed change device, thereby solving the technical problem of high cost.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The speed transmission mechanism of a two-way automatic transmission device includes a main shaft, an input member axially fixed outside the main shaft, and a coupling member sleeved on the main shaft and threadedly connected to the input member. A friction member that can form a rotational resistance to the coupling member is provided on the outer side of the coupling member. The friction member is characterized in that the friction member is made of a strip of metal sheet, and has an elastic action portion and a matching portion formed by bending. The friction member can be circumferentially fixed to the housing of the two-way automatic transmission device through the matching portion, the elastic action portion abuts against the outer wall of the coupling member, and the elastic force of the elastic action portion acts inwardly on the coupling member.

[0008] When the input member rotates in the opposite direction for reversing, since the coupling member is threadedly connected to the input member and the coupling member is subjected to the rotational resistance exerted by the friction member, the friction member is circumferentially fixed to the housing of the two-way automatic transmission device through the mating part, so that the coupling member can move along the thread to control the circumferential linkage between the main shaft and the input member, thereby realizing reversing.

[0009] In the speed change transmission mechanism, the friction member is formed by bending a long metal sheet, and the elastic action part and the matching part are directly formed when the long metal sheet is bent to form the friction member. When the friction member is placed outside the coupling member, the elastic action part directly abuts against the outer wall of the coupling member to form the rotation resistance of the coupling member. Compared with the positioning ring in the prior art, which is a thick metal block, the friction member in this solution forms an effective rotation resistance to the coupling member while greatly reducing the application of raw materials, thereby greatly reducing the manufacturing cost. Moreover, metal materials are more wear-resistant than conventional elastic materials such as plastics, nylon, etc.

[0010] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, the friction member is in the shape of a ring with a mouth, and the elastic action part is located near the mouth.

[0011] The elastic action part is arranged at the mouth of the main body, and the friction part is not easy to be separated from the coupling part, thereby reducing the manufacturing cost and ensuring the stability of the cooperation between the friction part and the coupling part.

[0012] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, one end of the friction member has a convex piece folded outward, and the elastic action portion is the inner side wall of the end of the friction member.

[0013] One end of the friction piece is folded outward to form a convex piece, so that an inward elastic force will naturally be generated at the end of the friction piece. Then, when the friction piece is sleeved outside the coupling piece, the inner side wall at the end of the friction piece will act as an elastic action part to exert an inward elastic force to form a rotational resistance on the coupling piece.

[0014] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, the elastic action part is located at the plate body 1, the outer peripheral surface of the coupling piece is a cylindrical surface, and the plate body 1 is tangent to the outer peripheral surface of the coupling piece.

[0015] The sheet body is tangent to the outer peripheral surface of the coupling member, that is, the two form a line contact, which satisfies the formation of rotational resistance and at the same time avoids excessive rotational resistance resulting in sensitive speed switching.

[0016] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, the friction member further comprises a second sheet body tangent to the outer peripheral surface of the coupling member, and the protruding piece and the second sheet body are respectively fixedly connected to the two ends of the first sheet body.

[0017] The second sheet is tangent to the outer peripheral surface of the coupling part, and a line contact is formed between the two. Combined with the line contact formed between the first sheet and the coupling part, it can ensure that the friction part will not shift, thereby reducing the manufacturing cost and ensuring reliability.

[0018] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, both ends of the friction member are folded outward to form convex pieces, and an adjusting member capable of adjusting the distance is provided between the two convex pieces.

[0019] By adjusting the distance between the two protruding pieces through the adjusting member, the elastic force of the elastic action part can be adjusted to avoid the elastic force being too large or too small to affect the normal action of the combination part, thereby reducing the manufacturing cost and ensuring reliability. Conventionally, the elastic force of the spring is adjusted by tightening or loosening the screw.

[0020] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, the matching portion is a U-shaped structure formed by bending, and the notch of the matching portion faces outward.

[0021] When the speed transmission mechanism of the bidirectional automatic transmission device is fixed in the housing, the limiter fixed in the housing can be directly inserted into the matching part, so that the friction member and the housing are fixed in the circumferential direction so that the friction member can stably apply rotation resistance to the coupling member. The matching part is also directly formed when the long metal sheet is bent into the friction member, thereby further reducing the manufacturing cost.

[0022] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, as another technical solution, the friction member is plum blossom-shaped, the elastic action portion is the inwardly protruding portion of the friction member, and the matching portion is one of the inner recesses on the outside of the friction member.

[0023] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, the friction member is made of spring steel, and the friction member is formed by stamping.

[0024] Spring steel makes the friction parts elastic, and stamping the friction parts can reduce manufacturing costs while improving production efficiency.

[0025] In the above-mentioned speed transmission mechanism of the bidirectional automatic transmission device, the coupling is cylindrical, one end of the coupling is located outside the input member and is provided with an annular abutment surface, a gasket and a limiting spring that can prevent the gasket from detaching are provided on the coupling, and the friction member is fixed between the annular abutment surface and the gasket along the axial direction of the coupling.

[0026] Compared with the prior art, the speed transmission mechanism of the bidirectional automatic speed change device has the following advantages:

[0027] 1. The friction parts are made of long metal sheets that are bent. After bending, the matching parts and elastic action parts are naturally formed. While forming effective rotation resistance for the combined parts, the application of raw materials is greatly reduced, thereby greatly reducing the manufacturing cost;

[0028] 2. Both the first and second plates form line contact with the coupling part, which can not only form rotation resistance but also avoid insensitive speed switching, and can also ensure stable cooperation between the friction part and the coupling part to ensure reliability;

[0029] 3. By setting the adjusting parts, the rotation resistance can be adjusted to ensure the best condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a first embodiment of the speed transmission mechanism of the bidirectional automatic speed change device.

[0031] Figure 2 It is a cross-sectional view of the first embodiment of the speed transmission mechanism of the bidirectional automatic speed change device.

[0032] Figure 3It is a transverse cross-sectional view between the friction member and the push sleeve in the first embodiment of the speed transmission mechanism of the bidirectional automatic speed change device.

[0033] Figure 4 It is a schematic diagram of the friction member in the first embodiment of the speed transmission mechanism of the bidirectional automatic speed change device.

[0034] Figure 5A It is a bottom view schematic diagram between the push sleeve and the input member.

[0035] Figure 5B It is an exploded schematic diagram between the push sleeve and the input member.

[0036] Figure 6 It is a schematic diagram between the input parts, transmission parts and clutch structure.

[0037] Figure 7 It is a schematic diagram between the input part and the coupling plate.

[0038] In the figure, 1, main shaft; 2, transmission member; 2a, coupling section 1; 2b, coupling section 2; 2c, yielding section; 2d, connecting hole; 3, input member; 3a, arc groove; 4, coupling member; 4a, coupling sleeve; 4a1, pin; 4b, pushing sleeve; 4b1, convex head; 4b2, annular abutting surface; 5, friction member; 5a, elastic action part; 5b, matching part; 5c, sheet body 1; 5d, convex piece; 5d1, through hole; 5e, sheet body 2; 6, adjusting member; 7, gasket; 8, limit retaining spring; 9, coupling plate; 9a, connecting hole; 10, roller; 11, magnet; 12, buffer; 13, output gear; 14, driven gear; 15, connecting frame; 16, transmission support; 17, coupling claw; 18, coupling sleeve; 19, centripetal block. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0040] Embodiment 1

[0041] like Figure 1 and Figure 2 As shown, the speed transmission mechanism of the bidirectional automatic transmission device includes a main shaft 1, a transmission member 2 which is sleeved on the main shaft 1 and can form a linkage relationship with the main shaft 1, and an input member 3 which is axially fixed on the main shaft 1. A clutch structure is provided between the transmission member 2 and the input member 3 so that the two can be linked or disengaged along the circumferential direction. A coupling member 4 is sleeved on the main shaft 1, and the coupling member 4 is threadedly connected to the input member 3. A friction member 5 which can form a rotational resistance to the coupling member 4 is provided on the outer side of the coupling member 4. When the coupling member 4 moves along the main shaft 1, the clutch structure can switch between the linkage and disengagement of the transmission member 2 and the input member 3 along the circumferential direction.

[0042] Figure 2 , Figure 5A , Figure 5B , Figure 6 and Figure 7 As shown, in this embodiment, the transmission member 2 and the input member 3 are both annular, the clutch structure includes a coupling disc 9 arranged inside the input member 3 and a plurality of rollers 10 positioned on the coupling disc 9, the coupling disc 9 is adsorbed on the inner top wall of the input member 3 through a magnet 11, a plurality of clearance grooves are arranged on the outer side of the transmission member 2 along the circumferential direction, each roller 10 is located in the corresponding clearance groove and the coupling disc 9 can drive each roller 10 to move along the corresponding clearance groove, and the groove wall of each clearance groove facing the input member 3 includes a coupling section 1 2a, a coupling section 2b and a clearance section 2c connected between the coupling section 1 2a and the coupling section 2b. A plurality of arc-shaped connecting holes 2d are arranged on one end face of the transmission member 2, the coupling member 4 includes a coupling sleeve 4a sleeved outside the main shaft 1 and a push sleeve 4b sleeved outside the coupling sleeve 4a, the push sleeve 4b can rotate relative to the coupling sleeve 4a and the push sleeve 4b is fixed axially with the coupling sleeve 4a, and the friction member 5 is arranged outside the push sleeve 4b. The coupling plate 9 is provided with a plurality of coupling holes 9a, and one end surface of the coupling sleeve 4a is provided with a plurality of pins 4a1, each pin 4a1 passes through the corresponding coupling hole 9a and is inserted into the connection hole 2d. One end of the push sleeve 4b is threadedly connected to the input member 3, and the inner circumference of the input member 3 is provided with an arc groove 3a, and the side of the push sleeve 4b is provided with a convex head 4b1 located in the arc groove 3a and can move along the arc groove 3a. The other end of the push sleeve 4b extends out of the input member 3, and the coupling sleeve 4a is provided with a limit spring 8 and a gasket 7. The portion of the push sleeve 4b extending out of the input member 3 has an annular abutment surface 4b2, and the friction member 5 is axially fixed between the gasket 7 and the annular abutment surface 4b2 by the limit spring 8.

[0043] When the roller 10 is located at the coupling section 1 2a, the coupling section 1 2a and the inner wall of the input member 3 are both against the outer wall of the roller 10, so that the input member 3 and the transmission member 2 are circumferentially connected through the roller 10; when the roller 10 is located at the yielding section 2c, the vertical distance from the yielding section 2c to the inner wall of the input member 3 is greater than the outer diameter of the roller 10, and the input member 3 is separated from the transmission member 2; when the roller 10 is located at the coupling section 2b, the coupling section 2b and the inner wall of the input member 3 are both against the outer wall of the roller 10, and the input member 3 and the transmission member 2 are circumferentially connected through the roller 10. For the specific structure and working principle of the clutch structure and the matching relationship between the coupling member 44 and the clutch structure, reference can be made to the transmission mechanism of a two-way automatic transmission disclosed in application number 201811552712.9.

[0044] like Figure 1 and Figure 4As shown, the friction member 5 is formed by bending a strip metal sheet, and the strip metal sheet is specifically made of spring steel. The two-way automatic transmission device includes a housing, and the friction member 5 has a matching portion 5b formed by bending, and the matching portion 5b is specifically a U-shaped structure formed by bending, and the notch of the matching portion 5b faces outward. A limiting member is fixed in the housing of the two-way automatic transmission device, and the limiting member is inserted into the matching portion 5b. The limiting member can be a limiting pin, a limiting screw, or a limiting block fixed in the housing of the two-way automatic transmission device. The friction member 5 also has an elastic action portion 5a formed by bending, and the elastic action portion 5a abuts against the outer wall of the push sleeve 4b, and the elastic force of the elastic action portion 5a acts inward on the push sleeve 4b.

[0045] Furthermore, if Figure 1 , Figure 4 As shown in FIG. 5 , the friction member 5 is in a ring shape with an opening, and the elastic action portion 5a is located at the opening, and the opening of the friction member 5 is embraced on the outer wall of the push sleeve 4b. One end of the friction member 5 has a convex piece 5d folded outward, and the elastic action portion 5a is the inner side wall at the end of the friction member 5. The elastic action portion 5a is located at the sheet body 1 5c, and the outer peripheral surface of the push sleeve 4b is a cylindrical surface, and the sheet body 1 5c is tangent to the outer peripheral surface of the push sleeve 4b. The friction member 5 also has a sheet body 2 5e tangent to the outer peripheral surface of the push sleeve 4b, and the convex piece 5d and the sheet body 2 5e are respectively fixedly connected to the two ends of the sheet body 1 5c, and the convex piece 5d and the sheet body 1 5c and the sheet body 1 5c and the sheet body 2 5e can be directly fixedly connected or can be transitioned through an arc. In this embodiment, both ends of the friction member 5 have a convex piece 5d folded outward, the two convex pieces 5d are arranged in parallel, and an adjusting piece 6 capable of adjusting the distance is arranged between the two convex pieces 5d. The number of the second piece 5e is two, and the two second pieces 5e are respectively fixed to the two ends of the matching portion 5b. Specifically, the adjusting piece 6 is an adjusting screw and a nut, and the two convex pieces 5d are respectively provided with through holes 5d1, and the ends of the adjusting screws pass through the two through holes 5d1 in sequence, and the nut is threadedly connected to the ends of the adjusting screws. In actual production, the friction member 5 can be directly formed by stamping a mold. Compared with the prior art that requires the positioning ring, steel ball and spring to be manufactured separately, this solution can also make the production efficiency higher.

[0046] like Figure 2As shown, the main shaft 1 is fixedly connected with an output gear 13 for outputting power. The power input of the bidirectional automatic transmission device is a variable speed motor. The bidirectional automatic transmission device also includes a forward speed change mechanism and a buffer 12 that plays a buffering role during forward speed change. The specific structure and working principle of the buffer 12 can refer to the transmission mechanism of the automatic speed change motor disclosed in the application number 201711099388.5. The buffer 12 and the main shaft 1 are matched by splines, and the transmission member 2 is against the buffer 12 and the two are matched in a concave-convex manner. The matching of the buffer 12 and the main shaft 1 and the matching of the transmission member 2 and the buffer 12 form a linkage relationship between the transmission member 2 and the main shaft 1.

[0047] The forward speed change mechanism is mainly used to achieve speed switching between low speed forward and high speed forward. The forward speed change mechanism mainly includes a driven gear 14 axially fixed on the main shaft 1 and a connecting frame 15 circumferentially fixed on the driven gear 14. A transmission support 16 is axially fixed on the main shaft 1 and the transmission support 16 is circumferentially fixed to the buffer 12. The transmission support 16 is located on the inner side of the connecting frame 15. A plurality of coupling claws 17 distributed around the main shaft 1 are hinged on the transmission support 16. Each coupling claw 17 can swing relative to the transmission support 16. A coupling sleeve 18 is provided on the outer surface of the transmission support 16. A plurality of pushing parts are provided on the outer side of the coupling sleeve 18 along the circumferential direction. When the coupling sleeve 18 rotates, the pushing parts can drive the coupling claws 17 to swing. After swinging, the coupling claws 17 can fix the connecting frame 15 and the transmission support 16 circumferentially. Two arc-shaped centripetal blocks 19 are hinged in the connecting frame 15 and are distributed on both sides of the connecting sleeve 18. A magnetic block is fixed between the two centripetal blocks 19 in the connecting frame 15. The hinge point of the centripetal block 19 is close to the outer end of the centripetal block 19, and the inner end of the centripetal block 19 is adsorbed on the corresponding magnetic block.

[0048] When the vehicle is moving forward at a low speed, the power of the input member 3 is directly transmitted to the main shaft 1 through the transmission member 2 for output. In this process, the groove wall of one side of the arc groove 3a abuts against the convex head 4b1, so that the push sleeve 4b overcomes the action of the elastic acting part 5a on the friction member 5 and rotates with the input member 3.

[0049] When switching to high-speed forward, the forward speed change mechanism causes the main shaft 1 to rotate with the transmission member 2 in a counterclockwise high-speed manner, and the speed of the transmission member 2 is greater than the speed of the input member 3. The clutch structure causes the transmission member 2 to be circumferentially disengaged from the input member 3. In this state, the convex head 4b1 still abuts against the same side groove wall of the arc groove 3a, so that the push sleeve 4b overcomes the action of the elastic action portion 5a on the friction member 5 and rotates together with the input member 3.

[0050] When switching to reverse, the input member 3 receives power and rotates clockwise, so that the groove wall on the other side of the arc groove 3a approaches the convex head 4b1. If the input member 3 is a stationary object, it is manifested as the convex head 4b1 moving along the arc groove 3a. In this process, there is no force between the push sleeve 4b and the input member 3 in the circumferential direction. At the same time, the push sleeve 4b is subjected to the force of the elastic action part 5a on the friction member 5, so that the push sleeve 4b does not rotate synchronously with the input member 3. In this way, the push sleeve 4b will push the coupling sleeve 4a along the thread to move away from the transmission member 2. In this way, the circumferential structure is switched to link the input member 3 and the transmission member 2 in the circumferential direction, so that the main shaft 1 rotates in the reverse direction to realize the reverse of the vehicle. When the input member 3 rotates to the groove wall on the other side of the arc groove 3a against the convex head 4b1, the input member 3 and the push sleeve 4b are reconnected together in the circumferential direction to form synchronous rotation.

[0051] Embodiment 2

[0052] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the friction member 5 is plum blossom-shaped, the elastic action portion 5a is the portion of the friction member 5 protruding inward, and the matching portion 5b is one of the concave portions on the outside of the friction member 5.

[0053] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A transmission mechanism of a bidirectional automatic transmission device, comprising a main shaft (1), an input member (3) axially fixed outside the main shaft (1), and a coupling member (4) sleeved on the main shaft (1) and threadedly connected to the input member (3), wherein a friction member (5) capable of forming a rotational resistance to the coupling member (4) is provided on the outer side of the coupling member (4), wherein: The friction member (5) is made of a strip of metal sheet. The friction member (5) has an elastic action portion (5a) and a matching portion (5b) formed by bending. The friction member (5) can be circumferentially fixed to the housing of the two-way automatic transmission device through the matching portion (5b). The elastic action portion (5a) abuts against the outer wall of the coupling member (4) and the elastic force of the elastic action portion (5a) acts inwardly on the coupling member (4). The friction member (5) is in a ring shape with an opening. The elastic action portion (5a) is located near the opening. One end of the friction member (5) has a convex piece (5d) folded outward. The elastic action portion (5a) is the inner side wall at the end of the friction member (5). The location of the elastic action portion (5a) is a sheet body (5c). ), the outer peripheral surface of the coupling member (4) is a cylindrical surface, the sheet body 1 (5c) is tangent to the outer peripheral surface of the coupling member (4), the friction member (5) further comprises a sheet body 2 (5e) tangent to the outer peripheral surface of the coupling member (4), the convex piece (5d) and the sheet body 2 (5e) are respectively fixedly connected to the two ends of the sheet body 1 (5c), both ends of the friction member (5) are folded outward to form a convex piece (5d), and an adjusting member (6) capable of adjusting the distance is provided between the two convex pieces (5d), the matching portion (5b) is a U-shaped structure formed by bending, and the notch of the matching portion (5b) faces outward, the friction member (5) is in the shape of a plum blossom, the elastic action portion (5a) is a portion of the friction member (5) that convexes inward, and the matching portion (5b) is one of the concave parts on the outside of the friction member (5).

2. The speed transmission mechanism of the bidirectional automatic transmission device according to claim 1, characterized in that: The friction member (5) is made of spring steel, and the friction member (5) is formed by stamping.

3. The speed transmission mechanism of the bidirectional automatic transmission device according to claim 1, characterized in that: The coupling member (4) is cylindrical, one end of the coupling member (4) is located outside the input member (3) and is provided with an annular abutment surface (4b2), a gasket (7) and a limit spring (8) capable of preventing the gasket (7) from detaching are provided on the coupling member (4), and the friction member (5) is fixed between the annular abutment surface (4b2) and the gasket (7) along the axial direction of the coupling member (4).

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