Damping device for rear derailleur and rear derailleur

Abstract

The utility model provides a damping device for a rear derailleur and the rear derailleur. The damping device is arranged in a movable member of a rear derailleur and connected with a chain guide of the rear derailleur through a main shaft, the damping device can apply damping force to the main shaft when the chain guide rotates in one rotation direction relative to the movable member through the main shaft, and the damping device comprises a first friction piece and a second friction piece, the rotating shaft is connected with the main shaft and is driven by rotation of the main shaft; the second friction piece is in contactable friction joint with the first friction piece to generate friction damping force, the second friction piece is configured to allow rotation in a first rotation direction, and rotation in a second rotation direction opposite to the first rotation direction is stopped; the damping device further comprises a damping adjusting piece, and the damping adjusting piece is configured to be capable of adjusting the friction damping force between the first friction piece and the second friction piece. The damping force provided by the damping device is adjustable, and different use requirements can be met.

Description

Technical Field

[0001] The present application relates to the technical field of bicycles, and in particular to a damping device for a rear derailleur and a rear derailleur. Background Art

[0002] The rear derailleur is an important part of a speed-changing bicycle, which is used to push the chain to switch between flywheels of different diameters to change the transmission ratio and achieve speed change. The rear derailleur has a chain guide, on which a tensioning wheel is arranged to mesh with the chain. During the speed change process, the length of the chain that matches the flywheels of different diameters varies. Therefore, during the speed change process, the chain guide will tighten or release a certain length of the chain by changing its angle.

[0003] In the prior art, the chain guide is usually kept in a tensioned state by the force of an elastic biasing element. When the bicycle is traveling on a flat terrain, the solutions in the prior art are usually sufficient to keep the chain guide in a tensioned state, thereby ensuring that the chain has sufficient tension and does not fall off the sprocket. However, when the bicycle is traveling on a rough terrain, due to the large bumps and vibrations, the chain guide may move in a direction that causes the chain to relax at some moments, which may cause the chain to relax and fall off.

[0004] In this regard, there is a solution in the prior art to alleviate the above-mentioned problem by adding a damping system, such as the Chinese invention patent with announcement number CN108995759B, which discloses a damper device for a rear derailleur. Although adding a damper device can alleviate the problem of chain loosening and chain falling off, the derailleur needs to overcome the damping force of the damper device to work during the speed change process, which will increase energy consumption, so the damping force is not the greater the better. However, the damping force provided by the damper device in the prior art is fixed, which is inconvenient for the user, because on the one hand, the user cannot change the damping force according to the scenes he often uses, which may result in the damper device providing a large damping force in the scene where the damper device does not need to provide a large damping force, resulting in energy consumption in the speed change process; on the other hand, after a long period of use, the fixed damping force will change due to wear, etc., which may cause the damping force provided by the damper device to no longer meet the demand, and at this time, a new damper device can only be replaced, which shortens its service life and increases the cost of use.

[0005] In view of this, it is necessary to propose a new technical solution to overcome the problems existing in the prior art. Utility Model Content

[0006] The present application provides a damping device for a rear derailleur and a rear derailleur, wherein the damping force provided by the damping device is adjustable to meet different usage requirements.

[0007] To achieve the above object, the present application adopts the following technical solution: a damping device for a rear derailleur, which is arranged in a movable member of the rear derailleur and connected to a chain guide of the rear derailleur via a main shaft, wherein the damping device is capable of applying a damping force to the main shaft when the chain guide rotates in one rotation direction relative to the movable member via the main shaft, and the damping device comprises:

[0008] A first friction member connected to the main shaft and driven to move by the rotation of the main shaft; and

[0009] a second friction member contactably and frictionally engaged with the first friction member to generate a friction damping force, wherein the second friction member is configured to allow rotation in a first rotational direction and to prevent rotation in a second rotational direction opposite to the first rotational direction;

[0010] When the main shaft drives the first friction member to rotate in the second rotation direction, the first friction member and the second friction member move relative to each other to generate a friction damping force; when the main shaft drives the first friction member to rotate in the first rotation direction, the first friction member and the second friction member move synchronously without generating a friction damping force;

[0011] Wherein, the damping device further includes a damping adjustment member, and the damping adjustment member is configured to be able to adjust the friction damping force between the first friction member and the second friction member.

[0012] As a further improved solution, the damping adjustment member adjusts the friction damping force between the first friction member and the second friction member by changing the positive pressure between the first friction member and the second friction member.

[0013] As a further improved solution, one of the first friction member and the second friction member is provided with a groove, and the other is a friction block arranged in the groove; wherein, the groove is tapered from the opening to the bottom, and the damping adjustment member can apply force to the friction block from the opening of the groove to the bottom thereof to increase the positive pressure between the friction block and the groove.

[0014] As a further improved solution, the groove and the friction block are both in a truncated cone shape.

[0015] As a further improved solution, the damping adjustment member includes a rotating nut threadedly connected to the upper end of the main shaft.

[0016] As a further improved solution, the damping device includes a one-way rotating member, wherein:

[0017] The one-way rotating member is fixed to the second friction member and can rotate relative to the movable member in a first rotation direction and is prevented from rotating in a second rotation direction opposite to the first rotation direction by the movable member;

[0018] Alternatively, the one-way rotating element is fixed to the movable member, and the second friction element can rotate relative to the one-way rotating element in a first rotation direction but is prevented from rotating in a second rotation direction opposite to the first rotation direction by the one-way rotating element.

[0019] As a further improved solution, the second friction member is sleeved on the outside of the first friction member, and the damping adjustment member includes a sleeve sleeved on the outside of the second friction member, and the sleeve has a closing end with adjustable width. The damping adjustment member changes the tightening force of the sleeve on the second friction member and the first friction member by adjusting the width of the closing end, thereby changing the positive pressure between the first friction member and the second friction member.

[0020] As a further improved solution, the second friction member is a cylindrical tube with a notch on the side.

[0021] As a further improved solution, the sleeve is fixed to the movable component.

[0022] As a further improved solution, a cooperating tooth and groove structure is arranged between the second friction member and the damping adjustment member, and the tooth and groove structure allows the second friction member to rotate relative to the damping adjustment member in a first rotational direction and prevents the second friction member from rotating relative to the damping adjustment member in a second rotational direction opposite to the first rotational direction.

[0023] The present application also adopts the following technical solution: a rear derailleur, comprising a fixed base, a connecting rod mechanism, a movable member, a chain guide and a damping device as described in any of the above, wherein the chain guide is suitable for rotating relative to the movable member to tension the chain passing through the chain guide; wherein the damping device is configured not to provide a damping force when the chain guide rotates in a direction of tensioning the chain, and to provide a damping force when the chain guide rotates in a direction of loosening the chain.

[0024] The damping device provided in the present application includes a damping adjusting member, which is configured to be able to adjust the friction damping force between the first friction member and the second friction member, so that the user can adjust the friction damping force according to his or her own requirements for the use of the bicycle, and when the friction damping force changes after a period of use, the friction damping force can be returned to the required state by adjusting the damping adjusting member, thereby allowing the damping device to have a longer service life and reduce the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0026] Figure 1 It is a three-dimensional combination diagram of an embodiment of the rear derailleur of the present application.

[0027] Figure 2 yes Figure 1 Exploded perspective view of the rear derailleur shown.

[0028] Figure 3 The main display Figure 1 Exploded perspective view of the damping device in the rear derailleur shown.

[0029] Figure 4 The main display Figure 1 A cross-sectional view of a damping device in a rear derailleur is shown.

[0030] Figure 5 It is a three-dimensional combination diagram of another embodiment of the rear derailleur of the present application.

[0031] Figure 6 yes Figure 5 Exploded perspective view of the rear derailleur shown.

[0032] Figure 7 The main display Figure 5 Exploded perspective view of the damping device in the rear derailleur shown.

[0033] Figure 8 The main display Figure 5 A cross-sectional view of a damping device in a rear derailleur is shown, which is cut along the axis of the main shaft.

[0034] Fig. 9 The main display Figure 5 A cross-sectional view of a damping device in a rear derailleur is shown, which is cut along an axis perpendicular to the main shaft.

[0035] Explanation of the reference numerals in the accompanying drawings: 100, rear derailleur; 1, fixed base; 2, connecting rod mechanism; 3, movable member; 31, upper cover; 32, lower cover; 33, biasing member; 34, screw connector; 4, chain guide; 5, main shaft; 6, damping device; 61, first friction member; 62, second friction member; 621, notch; 622, tooth; 63, one-way rotating member; 64, damping adjustment member; 641, closing; 642, tightening block; 643, positioning block; 644, groove; 645, tightening screw; 65, gasket; 66, limit column. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various configurations. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] Unless otherwise defined, the technical terms or scientific terms used in this patent document shall have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the patent specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0041] See also Figures 1 to 9As shown, the present application discloses a damping device 6 for a rear derailleur 100 and the rear derailleur 100. The rear derailleur 100 comprises a fixed base 1, a connecting rod mechanism 2, a movable member 3, a chain guide 4 and the damping device 6. The fixed base 1 is used to attach the rear derailleur 100 to a bicycle; the connecting rod mechanism 2 is movably connected between the fixed base 1 and the movable member 3, so that the movable member 3 can move relative to the fixed base 1 to achieve speed change; the chain guide 4 is rotatably connected to the movable member 3 through a main shaft 5, and is suitable for rotating relative to the movable member 3 to tension the chain passing through the chain guide 4; the damping device 6 is configured to provide no damping force when the chain guide 4 rotates in a direction to tension the chain, and provide damping force when the chain guide 4 rotates in a direction to loosen the chain.

[0042] See also Figures 2 to 4 As shown, the damping device 6 is arranged in the movable member 3 of the rear derailleur 100 and is connected to the chain guide 4 of the rear derailleur 100 via the main shaft 5. The damping device 6 can apply a damping force to the main shaft 5 when the chain guide 4 rotates in one rotation direction relative to the movable member 3 via the main shaft 5. The damping device 6 includes a first friction member 61, a second friction member 62 and a damping adjustment member 64. The first friction member 61 is connected to the main shaft 5 and is driven to move by the rotation of the main shaft 5, and the second friction member 62 is contactably and frictionally engaged with the first friction member 61 to generate a friction damping force, wherein the second friction member 62 is configured to allow rotation in a first rotation direction, while rotation in a second rotation direction opposite to the first rotation direction is prevented. The damping adjustment member 64 is configured to be able to adjust the friction damping force between the first friction member 61 and the second friction member 62. When the main shaft 5 drives the first friction member 61 to rotate in the second rotation direction, the first friction member 61 and the second friction member 62 move relative to each other to generate a friction damping force. When the main shaft 5 drives the first friction member 61 to rotate in the first rotation direction, the first friction member 61 and the second friction member 62 move synchronously without generating a friction damping force.

[0043] The damping device 6 provided in the present application includes a damping adjustment member 64, which is configured to be able to adjust the friction damping force between the first friction member 61 and the second friction member 62, so that the user can adjust the friction damping force according to his or her own needs for using the bicycle, and when the friction damping force changes after a period of use, the friction damping force can be returned to the required state by adjusting the damping adjustment member 64, so that the damping device 6 can have a longer service life and reduce the cost of use.

[0044] In some embodiments, the damping adjustment member 64 adjusts the friction damping force between the first friction member 61 and the second friction member 62 by changing the positive pressure between the first friction member 61 and the second friction member 62. Figures 2 to 4 As shown, in this embodiment, one of the first friction member 61 and the second friction member 62 is provided with a groove, and the other is a friction block arranged in the groove; wherein, the groove is arranged to be gradually reduced from the opening to the bottom, and the damping adjustment member 64 can apply force to the friction block from the opening of the groove to the bottom thereof to increase the positive pressure between the friction block and the groove. In this embodiment, the groove and the friction block are both truncated cone-shaped; in other embodiments, they can also be other shapes, such as prism-shaped or wedge-shaped. Such an arrangement makes it possible for the friction damping force generated by the friction block and the groove to be greater as it moves downward, and different friction damping forces can be obtained by changing the position of the friction block in the groove, which is convenient to adjust. In this embodiment, the damping adjustment member 64 includes a rotating nut threadedly connected to the upper end of the main shaft 5. Specifically, an outer thread is provided at the upper end of the main shaft 5, and the rotating nut is provided with an inner thread. The rotating nut can rotate upward or downward at the upper end of the main shaft 5 through the cooperation of the inner thread and the outer thread. When the rotating nut rotates upward, the extrusion force between the first friction member 61 and the second friction member 62 is reduced, that is, the positive pressure between the two is reduced. When the first friction member 61 and the second friction member 62 rotate relative to each other, the friction damping force between the two is reduced; when the rotating nut rotates upward, the first friction member 61 is pressed downward, and the positive pressure between the first friction member 61 and the second friction member 62 increases. When the first friction member 61 and the second friction member 62 rotate relative to each other, the friction damping force between the two increases. In order to prevent the rotating nut from loosening, a gasket 65 is further provided between the rotating nut and the first friction member 61. The gasket 65 is in a curved arched shape so as to provide elastic force to maintain the pressing force of the rotating nut on the first friction member 61.

[0045] In this embodiment, the first friction member 61 is sleeved on the upper end of the main shaft 5 and the two are relatively fixed. That is, the first friction member 61 and the main shaft 5 do not generate relative rotational motion, so as to ensure that the rotation of the main shaft 5 can drive the first friction member 61 to rotate. In this embodiment, the upper end of the main shaft 5 is set as a flat structure to cooperate with the flat hole on the first friction member 61 to achieve the relative fixation of the two in the circumferential direction. The first friction member 61 can be made of a material that can provide a large friction force, such as silicone, rubber, asbestos, etc. In other embodiments, the first friction member 61 can also be integrally formed with the main shaft 5. In this embodiment, the second friction member 62 is sleeved on the outside of the main shaft 5 and the first friction member 61, and the second friction member 62 and the main shaft 5 are clearance-matched to ensure that the rotational motion of the main shaft 5 will not be directly transmitted to the second friction member 62. Similarly, the second friction member 62 can be made of a material that can provide a large friction force, such as silicone, rubber, asbestos, etc. In some embodiments, in order to ensure the dimensional stability of the second friction member 62, the second friction member 62 can be a hard component made of plastic, metal or other materials, and the inner surface of the groove of the second friction member 62 can be set to a surface that can provide better friction, such as making a rough surface or adding the above-mentioned material that can provide greater friction.

[0046] Please continue reading Figures 2 to 4 As shown, the damping device 6 also includes a one-way rotating member 63, which is used to realize that the second friction member 62 can rotate in the first rotation direction and cannot rotate in the second rotation direction opposite to the first rotation direction. In one embodiment, the one-way rotating member 63 is fixed to the second friction member 62, and can rotate relative to the movable member 3 in the first rotation direction and be blocked by the movable member 3 in the second rotation direction opposite to the first rotation direction. For example, in this embodiment, the one-way rotating member 63 cooperates with the movable member 3 through a limiting column 66, and a limiting groove that cooperates with the limiting column 66 is provided on the movable member 3, one side of the limiting groove is an opening so that the limiting column 66 can rotate out from the opening side, and the other side will block the limiting column 66, so as to realize only one-way rotation. In other embodiments, the one-way rotating member 63 is fixed to the movable member 3, and the second friction member 62 can rotate relative to the one-way rotating member 63 in the first rotation direction and be blocked by the one-way rotating member 63 in the second rotation direction opposite to the first rotation direction. It should be noted that there are many ways to achieve unidirectional rotational motion, such as one-way bearings, ratchet structures, etc. The one-way rotating member 63 in the present application can also be implemented by existing devices, mechanisms or structures that can achieve unidirectional rotation, such as one-way bearings, ratchet structures, etc.

[0047] exist Figures 1 to 4In the illustrated embodiment, the assembly relationship of the damping device 6 in the movable member 3 is as follows: a hollow installation cavity is provided inside the movable member 3, an upper cover 31 is installed at the upper end of the installation cavity, and a lower cover 32 is installed at the lower end, a biasing member 33 is installed in the installation cavity, and the biasing member 33 is a spring; the main shaft 5 is inserted into the biasing member 33, the first friction member 61 is fixed to the upper end of the main shaft 5, the second friction member 62 is sleeved on the outside of the main shaft 5 and the first friction member 61, and the one-way rotating member 63 is sleeved on the outside of the second friction member 62; the screw connection member 34 passes through the chain guide 4 and is locked to the lower end of the main shaft 5.

[0048] When in use, when the chain guide 4 drives the main shaft 5 to rotate through the screw connection 34, the main shaft 5 drives the first friction member 61 to rotate; when the first friction member 61 rotates in the first direction, the friction force between the first friction member 61 and the second friction member 62 drives the second friction member 62 to rotate together, and at this time, no friction damping force is generated between the first friction member 61 and the second friction member 62; when the first friction member 61 rotates in the second direction, the movement of the second friction member 62 is blocked and cannot rotate, and at this time, the rotation of the first friction member 61 and the second friction member 62 generate friction damping force.

[0049] See also Figures 5 to 9 As shown, it is a diagram of the second embodiment of the rear derailleur of the present application. Figures 1 to 4The main difference between the illustrated embodiments is the different structure of the damping device 6. In this embodiment, the second friction member 62 is sleeved on the outside of the first friction member 61, and the damping adjustment member 64 includes a sleeve sleeved on the outside of the second friction member 62, and the sleeve has a closing opening 641 with adjustable width. The damping adjustment member 64 changes the tightening force of the sleeve on the second friction member 62 and the first friction member 61 by adjusting the width of the closing opening 641, thereby changing the positive pressure between the first friction member 61 and the second friction member 62. Specifically, the second friction member 62 is a cylindrical tube with a notch on the side, and the damping adjustment member 64 is provided with a pair of tightening blocks 642 near the closing opening 641, and the tightening blocks 642 are connected with tightening screws 645, and the width of the closing opening 641 can be reduced by tightening the tightening screws 645. The outer wall of the sleeve of the damping adjustment member 64 is further provided with a positioning block 643, and the movable member 3 is provided with a positioning groove matched with the positioning block 643, so as to fix the damping adjustment member 64 to the movable member 3 and prevent the damping adjustment member 64 from rotating. A tooth and groove structure that cooperates with each other is provided between the second friction member 62 and the damping adjustment member 64, and the tooth and groove structure allows the second friction member 62 to rotate relative to the damping adjustment member 64 in a first rotation direction, and prevents the second friction member 62 from rotating relative to the damping adjustment member 64 in a second rotation direction opposite to the first rotation direction. In this embodiment, the tooth and slot structure includes a slot 644 provided on the inner side of the damping adjustment member 64 and a tooth 622 provided on the second friction member 62. The tooth 622 is generally ratchet-shaped, with one end tilted and the other end smoothly connected to the main body, and the tilted end is located in the slot 644. The rotation of the second friction member 62 with the tilted end of the tooth 622 as the upstream is prevented, while the rotation with the smoothly connected end of the tooth 622 as the upstream is allowed. The main difference between this embodiment and the first embodiment is the structure of the damping device 6. The other components in this embodiment can be arranged with reference to the first embodiment, and will not be repeated here.

[0050] From the above description of the specific embodiment, it can be known that the damping device 6 provided in the present application includes a damping adjustment member 64, and the damping adjustment member 64 is configured to be able to adjust the friction damping force between the first friction member 61 and the second friction member 62, so that the user can adjust the friction damping force according to his or her own needs for using the bicycle, and when the friction damping force changes after a period of use, the friction damping force can be returned to the required state by adjusting the damping adjustment member 64, so that the damping device 6 can have a longer service life and reduce the cost of use.

[0051] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A damping device for a rear derailleur, arranged in a movable member of the rear derailleur and connected to a chain guide of the rear derailleur via a main shaft, the damping device being capable of applying a damping force to the main shaft when the chain guide rotates in one rotation direction relative to the movable member via the main shaft, characterized in that: The damping device comprises: A first friction member connected to the main shaft and driven to move by the rotation of the main shaft; and a second friction member contactably and frictionally engaged with the first friction member to generate a friction damping force, wherein the second friction member is configured to allow rotation in a first rotational direction and to prevent rotation in a second rotational direction opposite to the first rotational direction; When the main shaft drives the first friction member to rotate in the second rotation direction, the first friction member and the second friction member move relative to each other to generate a friction damping force; when the main shaft drives the first friction member to rotate in the first rotation direction, the first friction member and the second friction member move synchronously without generating a friction damping force; Wherein, the damping device further includes a damping adjustment member, and the damping adjustment member is configured to be able to adjust the friction damping force between the first friction member and the second friction member.

2. The damping device according to claim 1, characterized in that The damping adjustment member adjusts the friction damping force between the first friction member and the second friction member by changing the normal pressure between the first friction member and the second friction member.

3. The damping device according to claim 2, characterized in that: One of the first friction member and the second friction member is provided with a groove, and the other is a friction block arranged in the groove; wherein the groove is tapered from the opening to the bottom, and the damping adjustment member can apply force to the friction block from the opening of the groove to the bottom thereof to increase the positive pressure between the friction block and the groove.

4. The damping device according to claim 3, characterized in that: The groove and the friction block are both in a truncated cone shape.

5. The damping device according to any one of claims 1 to 4, characterized in that: The damping adjustment member includes a rotating nut threadedly connected to the upper end of the main shaft.

6. The damping device according to claim 1, characterized in that: The damping device comprises a one-way rotating member, wherein: The one-way rotating member is fixed to the second friction member and can rotate relative to the movable member in a first rotation direction and is prevented from rotating in a second rotation direction opposite to the first rotation direction by the movable member; Alternatively, the one-way rotating element is fixed to the movable member, and the second friction element can rotate relative to the one-way rotating element in a first rotation direction but is prevented from rotating in a second rotation direction opposite to the first rotation direction by the one-way rotating element.

7. The damping device according to claim 1 or 2, characterized in that: The second friction member is sleeved on the outside of the first friction member, and the damping adjustment member includes a sleeve sleeved on the outside of the second friction member, the sleeve has a closing end with adjustable width, and the damping adjustment member changes the tightening force of the sleeve on the second friction member and the first friction member by adjusting the width of the closing end, thereby changing the positive pressure between the first friction member and the second friction member.

8. The damping device according to claim 7, characterized in that The second friction member is a cylindrical tube with a notch on the side.

9. The damping device according to claim 7, characterized in that: The sleeve is fixed to the movable member.

10. The damping device according to claim 7, characterized in that: A cooperating tooth and groove structure is arranged between the second friction member and the damping adjustment member, and the tooth and groove structure allows the second friction member to rotate relative to the damping adjustment member in a first rotation direction and prevents the second friction member from rotating relative to the damping adjustment member in a second rotation direction opposite to the first rotation direction.

11. A rear derailleur, characterized in that: It comprises a fixed base, a connecting rod mechanism, a movable member, a chain guide and a damping device as described in any one of claims 1 to 10, wherein the chain guide is suitable for rotating relative to the movable member to tension a chain passing through the chain guide; wherein the damping device is configured to provide no damping force when the chain guide rotates in a direction to tension the chain, and to provide damping force when the chain guide rotates in a direction to loosen the chain.

Images