A bicycle rear derailleur

Abstract

The utility model discloses a bicycle rear derailleur, including P joint subassembly, its connection is in chain guide subassembly, damping subassembly, it includes one way clutch and bearing inner ring, one way clutch sets up in P joint subassembly, and bearing inner ring sets up in one way clutch, is equipped with the damping axle in bearing inner ring, is equipped with a plurality of first friction disc on the damping axle, is equipped with second friction disc between two first friction discs, and the friction surface between first friction disc and second friction disc and the axial angle of damping axle is obtuse angle or acute angle, connecting shaft, it sets up in P joint subassembly, switch subassembly, it is used for realizing the clamping of damping axle and connecting shaft, and the inner chamber of connecting shaft is equipped with locking piece and separating piece, and locking piece is used for connecting the chain guide subassembly of connecting axle, and separating piece is used for realizing the separation of damping axle and connecting axle. The rear derailleur of the utility model can provide better damping effect, and can adjust the size of damping, satisfies different damping demand.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and more specifically to a bicycle rear derailleur. Background Technology

[0002] The rear derailleur, or simply rear derailleur, is an important component of the derailleur system on multi-speed bicycles such as mountain bikes and road bikes. It is responsible for shifting the chain across different sprockets to cope with different road conditions, allowing riders to use their bodies more efficiently to propel the bicycle forward.

[0003] The primary function of a rear derailleur is to selectively switch the bicycle chain in the drivetrain among a series of gears of different diameters attached to the rear wheel. This involves switching the bicycle chain from one gear to another at the rear wheel to change the drivetrain's gear ratio. A secondary function of the rear derailleur is to apply tension to the chain on the non-drive side of the drivetrain to absorb slack and maintain the desired tension.

[0004] However, during cycling, such as on bumpy roads or rough terrain, the inertia of bumps and vibrations may cause the chain guide assembly to rotate undesirably in the slack direction (e.g., the chain rotates counterclockwise) in order to overcome the bias force applied to the chain guide assembly. This can lead to chain slack, chain slapping against the chain guide, chain guide vibration, and chain slippage, resulting in poor usability of the rear derailleur.

[0005] The undesirable solution is to integrate the unidirectional damping system into the chain tensioning section of the rear derailleur. Some of these solutions have a switch or switching mode to control the intervention of the damping system by opening and closing the switch or switching mode. However, such solutions have a large structural volume, poor damping effect, or cannot adjust the resistance, or cannot realize the switching function, and cannot meet the different resistance requirements under various working conditions. Summary of the Invention

[0006] The purpose of this invention is to provide a bicycle rear derailleur that can provide excellent damping effect in a smaller size, and can adjust the damping magnitude and realize the on / off function to meet different damping requirements.

[0007] Therefore, this utility model provides a bicycle rear derailleur, including a base assembly and a chain guide assembly, the base assembly being connected to the bicycle; it also includes: a P-joint assembly connected to the chain guide assembly; a damping assembly including a one-way clutch and a bearing inner ring, the one-way clutch being disposed within the P-joint assembly, and the bearing inner ring being disposed within the one-way clutch; a damping shaft is provided within the bearing inner ring, a plurality of first friction plates are sleeved on the damping shaft, and a second friction plate is provided between two adjacent first friction plates, the friction surfaces between the first friction plates and the second friction plates forming an obtuse or acute angle with the axial direction of the damping shaft; the first friction plates are engaged with the damping shaft, and the second friction plates are engaged with the bearing inner ring; a connecting shaft is disposed within the P-joint assembly; a switch assembly is used to drive the damping shaft to move to achieve engagement between the damping shaft and the connecting shaft; the connecting shaft is provided with a locking member and a separating member, the locking member being used to connect the connecting shaft to the chain guide assembly, and the separating member being used to separate the damping shaft and the connecting shaft.

[0008] Preferably, the damping shaft has a locking protrusion, and the connecting shaft has a locking groove that matches the locking protrusion; the locking protrusion engages in the locking groove to achieve the engagement of the damping shaft and the connecting shaft.

[0009] Preferably, the connecting shaft has a first through cavity, and the separating member is fitted into the first through cavity; the separating member can extend out of the first through cavity and drive the damping shaft to move, so as to separate the damping shaft and the connecting shaft.

[0010] Preferably, the connecting shaft has a second through cavity that communicates with the first through cavity, and the locking member is fitted into the second through cavity; the locking member has a connecting cavity, and the separating member has a connecting groove that communicates with the connecting cavity.

[0011] Preferably, the damping shaft has a cavity, and an adjusting screw is connected inside the cavity; a washer is fitted on the adjusting screw, and the washer abuts between the first friction plate and the adjusting screw.

[0012] Preferably, a preload disc spring is sleeved on the damping shaft, the preload disc spring abutting between the damping shaft and the first friction plate, or the preload disc spring abutting between the first friction plate and the adjusting screw, or the preload disc spring abutting between the first friction plate and the second friction plate.

[0013] Preferably, the switch assembly includes an elastomer and a locking cover, the elastomer abutting between the inner ring of the bearing and the locking cover, and the locking cover being connected to the P joint assembly; the locking cover is used to drive the elastomer to move against the inner ring of the bearing to achieve the engagement of the damping shaft and the connecting shaft.

[0014] Preferably, the cross-section of the damping shaft is polygonal, the inner ring of the first friction plate is a polygonal through hole, and the polygonal through hole of the inner ring of the first friction plate is engaged with the shaft of the damping shaft.

[0015] Preferably, the inner ring of the bearing inner ring is provided with a plurality of matching grooves, and the outer ring of the second friction plate is provided with a plurality of matching protrusions that match the matching grooves.

[0016] Preferably, the chain guide assembly is provided with a limiting guide plate, the end of the connecting shaft is fitted inside the limiting guide plate, and the locking member is connected from the limiting guide plate to the connecting shaft.

[0017] Compared with the prior art, the advantages and positive effects of this utility model are:

[0018] The rear derailleur of this invention can conveniently and quickly turn the damping function on and off, specifically:

[0019] The switching assembly includes an elastomer and a locking cover. The elastomer abuts against the locking cover and an adjusting screw. The locking cover is connected to the P-joint assembly. The locking cover drives the elastomer to press against the inner ring of the bearing, thereby engaging the damping shaft and the connecting shaft to activate the damping function. A hex wrench can be used to move the separating component, which in turn moves the damping shaft, allowing it to disengage from the connecting shaft and thus deactivate the damping function of the damping assembly.

[0020] The first and second friction plates can rotate relative to each other, generating frictional damping. The first and second friction surfaces are in contact and parallel to each other. The angle between the first friction surface and the damping axis is an obtuse or acute angle. This allows for a larger friction area within the same radial space. Under the same applied force, a larger friction area can reduce the pressure acting on the friction surface, thereby improving the durability of the friction plates and providing better damping effect.

[0021] A preloaded disc spring is fitted on the damping shaft. The preloaded disc spring generates spring force through elastic deformation. By adjusting the tightness of the adjusting screw, the compression deformation of the preloaded disc spring can be adjusted, thereby adjusting the magnitude of the spring force. The spring force acts on multiple friction plates to generate frictional damping. Therefore, by adjusting the tightness of the screw, the magnitude of the damping force can be adjusted to meet different damping requirements.

[0022] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0023] Figure 1 This is one of the structural schematic diagrams of an embodiment of the bicycle rear derailleur of this utility model;

[0024] Figure 2 This is the second exploded view of an embodiment of the bicycle rear derailleur of this utility model;

[0025] Figure 3 This is a partial structural schematic diagram of one embodiment of the bicycle rear derailleur of this utility model;

[0026] Figure 4 This is a partial exploded view of one embodiment of the bicycle rear derailleur of this utility model;

[0027] Figure 5 This is one of the structural schematic diagrams of an embodiment of the P-joint component of this utility model;

[0028] Figure 6 This is a second schematic diagram of an embodiment of the P-joint component of this utility model;

[0029] Figure 7 This is a schematic diagram of an embodiment of the adjusting screw and damping shaft of this utility model;

[0030] Figure 8 This is a schematic diagram of one embodiment of the damping shaft of this utility model;

[0031] Figure 9 This is a schematic diagram of an embodiment of the first friction plate of this utility model;

[0032] Figure 10 This is a schematic diagram of one embodiment of the bearing inner ring of this utility model;

[0033] Figure 11 This is a schematic diagram of an embodiment of the second friction plate of this utility model;

[0034] Figure 12 This is a partial structural schematic diagram of one embodiment of the damping component of this utility model;

[0035] Figure 13 This is an exploded structural diagram of one embodiment of the damping component of this utility model;

[0036] Figure 14 This is a cross-sectional schematic diagram of one embodiment of the damping component of this utility model;

[0037] Figure 15This is a second cross-sectional schematic diagram of one embodiment of the damping component of this utility model;

[0038] Figure 16 This is a cross-sectional schematic diagram of an embodiment of the first and second friction plates of this utility model;

[0039] Figure 17 This is a schematic diagram of one embodiment of the damping component of this utility model;

[0040] Figure 18 This is a second schematic diagram of the structure of one embodiment of the damping component of this utility model;

[0041] Figure 19 This is a cross-sectional schematic diagram of one embodiment of the damping component of this utility model;

[0042] Figure 20 This is a cross-sectional schematic diagram of one embodiment of the connecting shaft of this utility model;

[0043] Figure 21 This is a partial structural schematic diagram of one embodiment of the first guide chain plate of this utility model;

[0044] Figure 22 This is a partial cross-sectional schematic diagram of one embodiment of the bicycle rear derailleur of this utility model;

[0045] Figure 23 This is a partial cross-sectional schematic diagram of one embodiment of the bicycle rear derailleur of this utility model;

[0046] Base assembly 100;

[0047] First guide plate 201, second guide plate 202, guide wheel 203, tension wheel 204, limiting guide plate 205, connecting groove 206, limiting groove 207, first limiting surface 208;

[0048] P-joint component 300, first inner cavity 301, second inner cavity 302, receiving cavity 303, torsion spring 304, sealing gasket 305;

[0049] One-way clutch 401, bearing inner ring 402, damping shaft 403, first friction plate 404, second friction plate 405, adjusting screw 406, shim 407, preloaded disc spring 408, cavity 409, polygonal through hole 410, adapter groove 411, adapter protrusion 412, first connecting plate 413, engaging protrusion 414, arc-shaped surface 415, first friction surface 416, second friction surface 417;

[0050] Connecting shaft 501, separating part 502, locking part 503, second connecting plate 504, engaging groove 505, first through cavity 506, limiting shaft 507, second limiting surface 508, second through cavity 509, connecting cavity 510, connecting groove 511;

[0051] Elastomer 601, locking cap 602, connecting screw 603;

[0052] Linkage assembly 700. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0054] The bicycle includes a frame with a front wheel and a rear wheel that are conventionally rotatably connected to the frame. The rear of the frame includes a rear derailleur mounting plate, to which the rear derailleur is directly attached. Of course, many different rear derailleur mounting configurations are available, such as detachable derailleur hangers.

[0055] The bicycle also includes a conventional rear derailleur control mounted on the handlebars to control the rear derailleur via a Bowden-type shift control cable, which includes an inner steel wire slidably disposed within the cable housing.

[0056] The rider operates the rear derailleur control to selectively pull or release the inner wire, thereby operating the rear derailleur to move the chain laterally across multiple rear sprockets connected to the rear wheel.

[0057] like Figures 1-23 As shown, this utility model proposes a bicycle rear derailleur, including a base assembly 100 and a chain guide assembly. The base assembly 100 is connected to the bicycle and can be installed on the rear derailleur mounting plate.

[0058] The base assembly 100 can be any base assembly commonly used in this technical field, and no specific limitations are made here.

[0059] like Figure 1 , Figure 2As shown, the chain guide assembly includes a first guide plate 201, a second guide plate 202, a guide wheel 203, and a tension wheel 204. The guide wheel 203 is rotatably mounted between the first and second guide plates 201 and 202 by bolting, and is located at one end of each guide plate. The tension wheel 204 is rotatably mounted between the first and second guide plates 201 and 202 by bolting, and is located at the other end of each guide plate. The chain meshes with the guide wheel 203 and the tension wheel 204, and the chain is located between the first and second guide plates 201 and 202. The first and second guide plates 201 and 202 provide limiting and protection for the chain.

[0060] The bicycle rear derailleur of this utility model also includes a P-joint assembly 300, which is connected to the chain guide assembly; the connection method of the P-joint assembly 300 can be a common connection method in this technical field, and no specific limitation is made here. Figure 5 , Figure 6 As shown, the P joint component 300 has a first inner cavity 301 and a second inner cavity 302 that are connected to each other.

[0061] The bicycle rear derailleur of this utility model also includes a damping component, which is installed within the first inner cavity 301. Specifically, as shown... Figures 7-16 As shown, the damping assembly includes a one-way clutch 401 and a bearing inner ring 402. The one-way clutch 401 is fixed in the first inner cavity 301. The one-way clutch 401 can be fixed in the first inner cavity 301 by means of snap-fit, press-in or bonding, that is, the two do not move relative to each other.

[0062] In one embodiment of this application, the outer ring of the one-way clutch 401 is provided with a plurality of grooves (not shown in the figure) at equal intervals, and the inner wall of the first inner cavity 301 is provided with protruding engagement protrusions (not shown in the figure); through the engagement of the grooves and the protrusions, the outer ring of the one-way clutch 401 can be engaged and fixed in the first inner cavity 301, and no relative movement will occur between the one-way clutch 401 and the P joint assembly 300.

[0063] The bearing inner ring 402 is located within the one-way clutch 401, and the bearing inner ring 402 can move axially relative to the one-way clutch 401.

[0064] The one-way clutch 401 can be a common one-way clutch in this technical field. The one-way clutch 401 allows the inner ring 402 of the bearing to rotate only in one direction. In this application, the one-way clutch 401 allows the inner ring 402 of the bearing to rotate only clockwise and not counterclockwise.

[0065] A damping shaft 403 is provided inside the inner ring 402 of the bearing, and the damping shaft 403 can move axially synchronously with the inner ring 402 of the bearing.

[0066] Multiple first friction plates 404 are sleeved on the damping shaft 403, and a second friction plate 405 is provided between two adjacent first friction plates 404. The first friction plates 404 are engaged with the damping shaft 403, that is, the first friction plates 404 and the damping shaft 403 are engaged and fixed together, and the first friction plates 404 can rotate synchronously with the damping shaft 403; the second friction plates 405 are engaged with the inner ring of the bearing inner ring 402, that is, the second friction plates 405 and the bearing inner ring 402 are engaged and fixed together, and the second friction plates 405 can rotate synchronously with the bearing inner ring 402.

[0067] When the damping shaft 403 rotates counterclockwise, the first friction plate 404 rotates counterclockwise synchronously with the damping shaft 403; because

[0068] Since the inner ring 402 of the bearing cannot rotate counterclockwise, the second friction plate 405 also cannot rotate counterclockwise. This allows the first friction plate 404 to rotate counterclockwise relative to the second friction plate 405. Friction between the first friction plate 404 and the second friction plate 405 can generate frictional damping and provide a damping effect.

[0069] When the damping shaft 403 rotates clockwise, the first friction plate 404 rotates clockwise synchronously with the damping shaft 403; the bearing inner ring 402 can rotate clockwise, and the second friction plate 405 rotates clockwise synchronously with the bearing inner ring 402; thus, the first friction plate 404 and the second friction plate 405 rotate clockwise synchronously, and no frictional damping is generated between the first friction plate 404 and the second friction plate 405, so no damping effect can be provided.

[0070] The first friction plate 404 is engaged with the damping shaft 403, specifically, as follows: Figure 7 , Figure 8 , Figure 9 As shown, the cross-section of the damping shaft 403 is polygonal, and the inner ring of the first friction plate 404 is a polygonal through hole 410. The polygonal through hole 410 of the inner ring of the first friction plate 404 is engaged with the shaft of the damping shaft 403, thereby enabling the first friction plate 404 to engage with the damping shaft 403.

[0071] The cross-section of the damping shaft 403 can be pentagonal, hexagonal or other polygonal. The first friction plate 404 is adapted to the damping shaft 403. The polygonal through hole 410 of the inner ring of the first friction plate 404 can be pentagonal through hole, hexagonal through hole or other polygonal through hole.

[0072] The second friction plate 405 engages with the inner ring of the bearing inner ring 402, specifically, as follows: Figure 10 , Figure 11As shown, the inner ring of the bearing inner ring 402 is provided with a plurality of equally spaced fitting grooves 411, and the outer ring of the second friction plate 405 is provided with a plurality of fitting protrusions 412 that are adapted to the fitting grooves 411; the fitting protrusions 412 are fitted into the fitting grooves 411, thereby making the second friction plate 405 engage with the inner ring of the bearing inner ring 402.

[0073] The number of adapter grooves 411 and adapter protrusions 412 is the same. The adapter grooves 411 can be arc-shaped grooves, and the corresponding adapter protrusions 412 are arc-shaped protrusions, which can make the second friction plate 405 effectively engaged with the inner ring of the bearing inner ring 402.

[0074] The friction surfaces between the first friction plate 404 and the second friction plate 405 are not perpendicular to the axial direction of the damping shaft 403. The angle between the friction surfaces between the first friction plate 404 and the second friction plate 405 and the axial direction of the damping shaft 403 is an obtuse or acute angle. This allows for a larger friction area within the same radial space. Under the same applied force, a larger friction area can reduce the pressure acting on the friction surface, thereby improving the durability of the friction plates and providing better damping effect.

[0075] Specifically, such as Figure 9 , Figure 11 , Figures 14-16 As shown, in one embodiment of this application, the surface of the first friction plate 404 that contacts and / or rubs against the second friction plate 405 is provided with a raised and inclined first friction surface 416. The first friction surface 416 is arranged around the center of the first friction plate 404, and is a raised inclined plane. The first friction surface 416 and the axial angle between the first friction surface 416 and the damping shaft 403 is an obtuse angle. The surface of the second friction plate 405 that contacts and / or rubs against the first friction plate 404 is provided with a recessed and inclined second friction surface 417. The second friction surface 417 is arranged around the center of the second friction plate 405, and is a raised inclined plane. The second friction surface 417 and the axial angle between the second friction surface 417 and the damping shaft 403 is an obtuse angle.

[0076] The first friction surface 416 and the second friction surface 417 are parallel and rub against each other. The first friction surface 416 and the second friction surface 417 form an obtuse angle with the axial direction of the damping shaft 403. The second friction surface 417 and the damping shaft 403 form an obtuse angle with the axial direction of the damping shaft 403. That is, the friction surface between the first friction plate 404 and the second friction plate 405 forms an obtuse angle with the axial direction of the damping shaft 403.

[0077] Alternatively, in other embodiments, the friction surfaces between the first friction plate 404 and the second friction plate 405 form an acute angle with the axial direction of the damping shaft 403, the first friction surface 416 forms an acute angle with the axial direction of the damping shaft 403, and the second friction surface 417 forms an acute angle with the axial direction of the damping shaft 403. That is, the friction surfaces between the first friction plate 404 and the second friction plate 405 form an acute angle with the axial direction of the damping shaft 403.

[0078] The number of first friction plates 404 and the number of second friction plates 405 are not specifically limited here. In one embodiment of this application, the number of first friction plates 404 can be 4 and the number of second friction plates 405 can be 3. The second friction plates 405 are disposed between two adjacent first friction plates 404.

[0079] In one embodiment of this application, as Figure 7 As shown, the damping shaft 403 has a cavity 409 inside, the inner wall of the cavity 409 has an internal thread, and an adjusting screw 406 is connected inside the cavity 409. The first friction plate 404 and the second friction plate 5405 can be pressed onto the damping shaft 403 by adjusting the screw 406.

[0080] A washer 407 is fitted onto the adjusting screw 406, and the washer 407 abuts between the first friction plate 404 and the adjusting screw 403. The washer 407 strengthens the connection of the adjusting screw 406, so that the first friction plate 404 and the second friction plate 405 are firmly and reliably pressed onto the damping shaft 403.

[0081] A preloaded disc spring 408 is sleeved on the damping shaft 403. The preloaded disc spring 408 can abut between the damping shaft 403 and the first friction plate 404, or between the first friction plate 404 and the adjusting screw 406, or between the first friction plate 404 and the second friction plate 405. Figure 12 , Figure 13 , Figure 14 As shown, in one embodiment of this application, the preloaded disc spring 408 can abut against the damping shaft 403 and the first friction plate 404.

[0082] The preloaded disc spring 408 generates spring force through elastic deformation. By adjusting the tightness of the screw 406, the compression deformation of the preloaded disc spring 408 can be adjusted, thereby adjusting the magnitude of the spring force. The spring force acts on multiple friction plates to generate frictional damping. Therefore, by adjusting the tightness of the screw 406, the magnitude of the damping force can be adjusted to meet different damping requirements.

[0083] Specifically, if the adjusting screw 406 is tightened to a greater degree, the compression deformation of the preloaded disc spring 408 will be greater, resulting in a greater locking force and a greater contact friction between the first friction plate 404 and the second friction plate 405, thereby increasing the damping force. If the adjusting screw 406 is tightened to a lesser degree, the compression deformation of the preloaded disc spring 408 will be smaller, resulting in a smaller locking force and a smaller contact friction between the first friction plate 404 and the second friction plate 405, thereby decreasing the damping force.

[0084] The preloaded disc spring 408 can be any preloaded disc spring commonly used in this technical field, and no specific limitation is made here.

[0085] like Figure 4 , Figure 5 , Figure 23 As shown, a receiving cavity 303 is formed within the P-joint component 300, and the receiving cavity 303 is arranged around the periphery of the second inner cavity 302. A torsion spring 304 is housed within the receiving cavity 303; one end of the torsion spring 304 abuts against the P-joint component 300, and the other end extends out of the receiving cavity 303 and abuts against the first guide plate 201. The torsion spring 304 can provide tension to the chain guide assembly.

[0086] The P-joint component 300 and the first guide plate 201 abut against each other. A sealing gasket 305 is provided at the point of contact between the P-joint component 300 and the first guide plate 201. The sealing gasket 305 can play a role in sealing and waterproofing, and can enhance the tightness of the connection between the P-joint component 300 and the first guide plate 201.

[0087] The bicycle rear derailleur of this utility model also includes a connecting shaft 501, which is fitted with a clearance fit in the second inner cavity 302, and the connecting shaft 501 can rotate in the second inner cavity 302.

[0088] The connecting shaft 501 has a through cavity, which includes a first through cavity 506 and a second through cavity 509 that are connected to each other.

[0089] The separator 502 can be a set screw commonly used in this technical field. The outer ring of the set screw is provided with an external thread, and the inner wall of the first through cavity 506 is provided with an internal thread. The set screw is threadedly connected in the first through cavity 506.

[0090] The locking component 503 can be a locking screw commonly used in this technical field. The locking screw fits in the second through cavity 509, and the connecting shaft 501 can be locked to the chain guide assembly by the locking screw.

[0091] The locking member 503 has a through cavity 510, and the separating member 502 has a through groove 511 at the end corresponding to the locking member 503. The through cavity 510 and the through groove 511 correspond to each other. The through groove 511 is a hexagonal groove, and the through cavity 510 is a cylindrical cavity open at both ends. The inner diameter of the through cavity 510 is larger than the inner diameter of the through groove 511. In use, a hexagonal wrench can be inserted into the through cavity 510 and the through groove 511 in sequence. The hexagonal wrench can rotate in the through cavity 510, and the hexagonal wrench and the through groove 511 engage. By rotating the hexagonal wrench, the separating member 502 can be rotated, so that the separating member 502 can move axially while rotating. Through the movement of the separating member 502, the separating member 502 can abut against the damping shaft 403 and drive the damping shaft 403 to move axially, so that the damping shaft 403 and the connecting shaft 501 are separated, thereby turning off the damping function of the damping assembly.

[0092] The chain guide assembly is provided with a limiting guide plate 205. Specifically, the limiting guide plate 205 is set on the first guide plate 201. The limiting guide plate 205 and the first guide plate 201 are integrally formed. The limiting guide plate 205 is provided with a through connecting groove 206 and a limiting groove 207.

[0093] The end of the connecting shaft 501 is provided with a limiting shaft 507, which is fitted in the limiting groove 207; the locking member 503 is connected in the connecting groove 206 and extends from the connecting groove 206 into the second through cavity 509 of the connecting shaft 501.

[0094] The limiting shaft 507 and the connecting shaft 501 are formed as a single piece, and the first through cavity 506 and the second through cavity 509 pass through the limiting shaft 507 and the connecting shaft 501. Through the cooperation of the limiting shaft 507 and the limiting groove 207, the connecting shaft 501 can be stably and reliably connected to the first guide plate 201, improving the firmness of the connection of the connecting shaft 501, and making the connecting shaft 501 and the first guide plate 201 fixed as a single piece, which can prevent relative rotation and displacement between the connecting shaft 501 and the first guide plate 201.

[0095] The inner wall of the limiting groove 207 is provided with two symmetrical and parallel first limiting surfaces 208, and the corresponding limiting shaft 507 is also provided with two symmetrical and parallel second limiting surfaces 508. The two first limiting pieces 208 are respectively attached to the two second limiting surfaces 508, which can play an effective limiting role, so that the connecting shaft 501 is stably and reliably connected to the first guide plate 201.

[0096] The bicycle rear derailleur of this invention also includes a switch assembly for engaging the damping shaft 403 and the connecting shaft 501. The switch assembly includes an elastic body 601 and a locking cover 602. The elastic body 601 abuts against the locking cover 602 and the adjusting screw 406. The locking cover 602 is connected to the P-joint assembly 300. The locking cover 602 drives the elastic body 601 to press against the adjusting screw 406, thereby engaging the damping shaft 403 and the connecting shaft 501.

[0097] The locking cover 602 can be connected to the P joint component 300 via the connecting screw 603. The elastic body 601 fits inside the cover cavity of the locking cover 602, and the elastic body 601 abuts against the inner ring 402 of the bearing. By tightening the connecting screw 603, the elastic body 601 can be compressed. The compressive force of the elastic body 601 can push the inner ring 402 of the bearing to move axially, which can cause the damping shaft 403 to move axially synchronously. The damping shaft 403 moves towards the connecting shaft 501, so that the damping shaft 403 can engage with the connecting shaft 501.

[0098] The elastic body 601 can be a helical spring, the axis of which is the same as the axis of the damping shaft 403. One end of the helical spring abuts against the locking cover 602, and the other end of the helical spring abuts against the adjusting screw 406.

[0099] In one embodiment of this application, a first connecting plate 413 is fixed to the end of the damping shaft 403, and a plurality of engaging protrusions 414 are fixed on the first connecting plate 413; correspondingly, a second connecting plate 504 is fixed to the end of the connecting shaft 501, and an engaging groove 505 is provided on the second connecting plate 504.

[0100] Specifically, there can be four engaging protrusions 414, which are symmetrically distributed. The engaging groove 505 can be cross-shaped, and the four engaging protrusions 414 can engage in the cross-shaped engaging groove 505, thereby enabling the damping shaft 403 and the connecting shaft 501 to engage, and thus enabling the damping function of the damping assembly.

[0101] Insert the hex wrench into the connecting cavity 510 and the connecting groove 511 in sequence. The hex wrench can rotate in the connecting cavity 510 and engage with the connecting groove 511. By rotating the hex wrench, the separating member 502 can be rotated, allowing the separating member 502 to move axially while rotating. Through the movement of the separating member 502, the separating member 502 can come into contact with the damping shaft 403 and drive the damping shaft 403 to move axially, thereby separating the damping shaft 403 from the connecting shaft 501 and thus turning off the damping function of the damping assembly.

[0102] In this application, the four engaging protrusions 414 of the damping shaft 403 can form a contact space, which corresponds to the separating member 502. The separating member 502 can move into the contact space and push the damping shaft 403 to move. The contact space can guide and limit the separating member 502, so that the separating member 502 can effectively resist and push the damping shaft 403, thereby ensuring that the damping shaft 403 can be effectively separated from the connecting shaft 501.

[0103] In this application, the separator 502 is cylindrical, and the four engaging protrusions 414 of the damping shaft 403 have concave arc-shaped surfaces 415 on their corresponding sides. The arc-shaped surfaces 415 can be adapted to the separator 502, so that the separator 502 can be adapted to the contact space formed by the four engaging protrusions 414.

[0104] The bicycle rear derailleur of this invention also includes a link assembly 700, which is pivotally connected between the base assembly 100 and the P-joint assembly 300.

[0105] In this invention, when a bicycle travels on a bumpy road, chain vibration, chain slapping against the first guide plate 201 and the second guide plate 202, and vibration of the first guide plate 201 and the second guide plate 202 may occur, potentially leading to chain detachment or other risks. The vibration of the first guide plate 201 and the second guide plate 202 includes counterclockwise and / or clockwise rotation. At this time, the damping shaft 403 and the connecting shaft 501 can be snapped together to activate the damping function of the damping assembly. Since the connecting shaft 501 and the first guide plate 201 are locked and fixed together, the damping shaft 403, the connecting shaft 501, and the first guide plate 201 can be sequentially connected together. When the first guide plate 201 rotates counterclockwise, the connecting shaft 501 and the damping shaft 403 also rotate counterclockwise. The first friction plate 404, which is engaged with the damping shaft 403, also rotates counterclockwise. The bearing inner ring 402 and the second friction plate 405 do not rotate. As a result, the first friction plate 404 rotates counterclockwise relative to the second friction plate 405. Friction damping is generated between the first friction plate 404 and the second friction plate 405, providing a damping effect to slow down the counterclockwise rotation of the damping shaft 403 and the connecting shaft 501. This slows down the counterclockwise rotation of the first guide plate 201, increases the resistance to the rotation of the first guide plate 201, and thus "holds" the chain, keeping the chain in a relatively taut state, reducing the vibration amplitude of the chain and the chain guide plate, stabilizing the chain, and reducing the risk of the chain falling off.

[0106] When the bicycle is traveling on a smooth road, simply disconnect the damping shaft 403 from the connecting shaft 501 to turn off the damping function of the damping assembly.

[0107] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A bicycle rear derailleur, comprising a base assembly and a chain guide assembly, the base assembly being connected to a bicycle; characterized in that, Also includes: P-joint assembly, which is connected to the chain guide assembly; A damping assembly includes a one-way clutch and a bearing inner ring. The one-way clutch is disposed within the P-joint assembly, and the bearing inner ring is disposed within the one-way clutch. A damping shaft is provided within the bearing inner ring, and a plurality of first friction plates are sleeved on the damping shaft. A second friction plate is provided between two adjacent first friction plates. The friction surfaces between the first and second friction plates form an obtuse or acute angle with the axial direction of the damping shaft. The first friction plates are engaged with the damping shaft, and the second friction plates are engaged with the bearing inner ring. A connecting shaft is disposed within the P-joint assembly; A switching assembly for driving the damping shaft to move to achieve engagement between the damping shaft and the connecting shaft; The connecting shaft is provided with a locking component and a separating component. The locking component is used to connect the connecting shaft to the chain guide assembly, and the separating component is used to separate the damping shaft from the connecting shaft.

2. The bicycle rear derailleur as described in claim 1, characterized in that, The damping shaft is provided with a locking protrusion, and the connecting shaft is provided with a locking groove that matches the locking protrusion; The engaging protrusion engages within the engaging groove to achieve the engagement of the damping shaft and the connecting shaft.

3. The bicycle rear derailleur as described in claim 1, characterized in that, The connecting shaft is provided with a first through cavity, and the separating component is fitted into the first through cavity; The separating member can extend out of the first through cavity and drive the damping shaft to move, thereby separating the damping shaft and the connecting shaft.

4. The bicycle rear derailleur as described in claim 3, characterized in that, The connecting shaft has a second through cavity that communicates with the first through cavity, and the locking member is fitted into the second through cavity; The locking component has a communicating cavity, and the separating component has a communicating groove that communicates with the communicating cavity.

5. The bicycle rear derailleur as described in claim 1, characterized in that, The damping shaft has a cavity inside, and an adjusting screw is connected inside the cavity; A washer is fitted onto the adjusting screw, and the washer abuts against the first friction plate and the adjusting screw.

6. The bicycle rear derailleur as described in claim 5, characterized in that, A preload disc spring is sleeved on the damping shaft. The preload disc spring abuts between the damping shaft and the first friction plate, or between the first friction plate and the adjusting screw, or between the first friction plate and the second friction plate.

7. The bicycle rear derailleur as described in claim 1, characterized in that, The switch assembly includes an elastomer and a locking cap, the elastomer abutting between the inner ring of the bearing and the locking cap, and the locking cap being connected to the P-joint assembly; The locking cap is used to drive the elastic body to press against the inner ring of the bearing to move, so as to achieve the locking of the damping shaft and the connecting shaft.

8. The bicycle rear derailleur as described in claim 1, characterized in that, The damping shaft has a polygonal cross-section, and the inner ring of the first friction plate has a polygonal through hole. The polygonal through hole of the inner ring of the first friction plate is engaged with the shaft of the damping shaft.

9. The bicycle rear derailleur as described in claim 1, characterized in that, The inner ring of the bearing inner ring is provided with multiple matching grooves, and the outer ring of the second friction plate is provided with multiple matching protrusions that match the matching grooves.

10. The bicycle rear derailleur as described in claim 1, characterized in that, The chain guide assembly is provided with a limiting guide plate, the end of the connecting shaft is fitted inside the limiting guide plate, and the locking member is connected from the limiting guide plate to the connecting shaft.

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