Rear transmission with damping function

Abstract

The utility model provides a rear derailleur with a damping function. The rear derailleur comprises a guide chain part, a movable part, an elastic part and a damping assembly. The chain guide part comprises a shaft piece, and the shaft piece is combined with the movable part, the elastic piece and the damping assembly. The damping assembly comprises a one-way bearing, an inner ring, an outer ring, a first damping fin and a second damping fin. The one-way bearing sleeves the shaft piece; the inner ring is located in the outer ring, the inner surface is combined with the one-way bearing, and the outer surface is combined with the first damping fin; the inner surface of the outer ring is combined with second damping fins; and a damping material is filled between the first damping fin and the second damping fin. When the chain swings, the deflecting force of the elastic piece cannot enable the chain shifting arm to reset in time, the chain shifting arm drives the first damping fin to rotate, and the damping material provides damping between the first damping fin and the second damping fin, so that the elastic piece rapidly restores the position of the chain shifting arm, the tension of the chain is kept, and faults caused by falling of the chain are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a derailleur of a bicycle; in particular, it relates to a rear derailleur with damping function. BACKGROUND

[0002] With the popularity of bicycles, bicycles are no longer just a means of transportation, but have become an important leisure sports equipment in people's life. In recent years, with the growth of market demand, mountain bikes and road bikes with variable speed function have also emerged.

[0003] In general, the chain of a bicycle is pulled tight by the biasing force provided by the torsion spring of the rear derailleur in a rotation direction to maintain the tension of the chain and ensure smooth riding. However, when riding on a forest road or off-road site, uneven road surfaces such as stones or obstacles are often encountered. In these cases, the torsion spring of the rear derailleur may not be able to recover in real time due to the shock, resulting in the instantaneous disappearance or weakening of the biasing force, which causes the chain to be unable to be pulled tight, and further causes problems such as chain whipping, chain drop, tooth skipping or pedal skipping.

[0004] Therefore, the design of the rear derailleur of the prior art bicycle still needs to be improved. CONTENT OF THE INVENTION

[0005] The technical problem to be solved by the present application is to provide a rear derailleur with damping function to avoid problems such as chain drop, tooth skipping or pedal skipping when a bicycle is ridden on uneven road conditions.

[0006] To achieve the above object, the present application provides a rear derailleur with damping function, which comprises a fixed part, a connecting rod assembly, a movable part, a chain guide part, an elastic member and a damping assembly. The fixed part comprises a frame connecting part and a first pivot part. The connecting rod assembly comprises a first connecting rod and a second connecting rod. One end of the first connecting rod and one end of the second connecting rod are pivotally connected to the first pivot part. The movable part comprises a second pivot part and a seat. The other end of the first connecting rod and the other end of the second connecting rod are pivotally connected to the second pivot part, so that the first pivot part, the connecting rod assembly and the second pivot part form a four-bar linkage mechanism. The seat has an axle hole. The chain guide part comprises a chain shifting arm and an axle member connected to the chain shifting arm. A guide wheel and a tension wheel are pivotally connected to the chain shifting arm. The axle member passes through the axle hole. The elastic member is connected between the seat and the chain guide part and provides a biasing force for the rotation of the chain guide part. The damping assembly comprises an inner ring, an outer ring, a plurality of first damping pieces, a plurality of second damping pieces and at least one one-way bearing. The inner ring is located in the outer ring, and the outer surface of the inner ring is connected with the first damping pieces. The outer ring is fixed to the seat, and the inner surface of the outer ring is connected with the second damping pieces. The first damping pieces and the second damping pieces are arranged in an alternating and spaced manner, and the first damping pieces and the second damping pieces are filled with a damping material. The at least one one-way bearing is embedded in the inner surface of the inner ring. The at least one one-way bearing is sleeved on the axle member, and the axle member can freely rotate relative to the inner ring in a first direction through the at least one one-way bearing. When the axle member of the chain guide part drives the first damping pieces on the inner ring to rotate in a second direction opposite to the first direction through the at least one one-way bearing, the damping material provides damping for the rotation of the first damping pieces relative to the second damping pieces.

[0007] The effect of the present application is that the rear derailleur with damping function can produce damping effect through the cooperation of the damping assembly and the at least one one-way bearing. When the bicycle is riding on uneven road, the axle member drives the first damping pieces to rotate relative to the second damping pieces through the at least one one-way bearing. At this time, the damping material provides damping for the rotation of the first damping pieces relative to the second damping pieces, slows down the speed and amplitude of the chain shifting arm of the chain guide part rotating around the axis of the axle member in the second direction, so that the chain can quickly return to its original position after being swung by external force. Therefore, the problem of chain falling due to insufficient chain tension will not occur.

[0008] The detailed content of other effects and embodiments of the present application is described below in conjunction with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 Front view of the rear derailleur with damping function according to a preferred embodiment of the present application;

[0011] Figure 2 Top view of the rear derailleur with damping function according to the preferred embodiment of the present application;

[0012] Figure 3 Exploded view of the rear derailleur with damping function according to the preferred embodiment of the present application;

[0013] Figure 4 Exploded view of the chain guide part of the rear derailleur with damping function according to the preferred embodiment of the present application;

[0014] Figure 5 Exploded view of the damping assembly of the rear derailleur with damping function according to the preferred embodiment of the present application;

[0015] Figure 6 Exploded view of the damping assembly of the rear derailleur with damping function according to the preferred embodiment of the present application from another perspective;

[0016] Figure 7 Sectional view of the rear derailleur with damping function according to the preferred embodiment of the present application in the direction of 7-7; Figure 1

[0017] Sectional view of the rear derailleur with damping function according to the preferred embodiment of the present application in the direction of 8-8; Figure 8 Figure 7 Sectional view of the rear derailleur with damping function according to the preferred embodiment of the present application in the direction of 9-9;

[0018] Figure 9 Sectional view of the rear derailleur with damping function according to the preferred embodiment of the present application in the direction of 10-10; Figure 2

[0019] Symbol explanation

[0020] 100: rear derailleur with damping function 10: fixed part

[0021] 12: first pivot part 12a: first pivot end

[0022] 14: frame connecting part 20: link assembly

[0023] 22: first link 24: second link

[0024] 30: movable part 32: second pivot part ​​

[0025] 32a: second pivot end 34: seat body

[0026] 342: shaft hole 344: first accommodating chamber

[0027] 40: chain guide portion 42: chain shifting arm

[0028] 422: guide wheel 424: tension wheel

[0029] 44: shaft member 442: base shaft

[0030] 442a: shaft rod 442b: screw hole

[0031] 442c: adjuster 443c: adjustment hole

[0032] 446: pivot shaft 446a: first portion

[0033] 446b: flange 446c: second portion

[0034] 446d: tool hole 50: elastic member

[0035] 60: damping assembly 61: inner ring

[0036] 612: first engaging block 614: second engaging groove

[0037] 616: second ring groove 62: outer ring

[0038] 622: third engaging groove 624: first ring groove

[0039] 63: first damping piece 632: second engaging block

[0040] 64: second damping piece 642: third engaging block

[0041] 65: one-way bearing 652: first engaging groove

[0042] 66: damping material 67: sealing member

[0043] 672: inner side edge 674: outer side edge

[0044] 68: housing 69: second accommodating chamber

[0045] D1: first direction D2: second direction

[0046] L: axial direction DETAILED DESCRIPTION

[0047] The positional relationships described in the embodiments below include up, down, left, and right, which are based on the directions in which the components are drawn in the figures, unless otherwise specified.

[0048] Referring to Figures 1 to 3 Fig. 1 shows a rear derailleur 100 with damping function according to a preferred embodiment of the present application, the rear derailleur 100 with damping function comprises a fixed part 10, a connecting rod assembly 20, a movable part 30, a chain guide part 40, a resilient member 50 and a damping assembly 60.

[0049] The fixed part 10 is used to connect to the frame of a bicycle and is located outside the rear chainset of the bicycle. As shown in Figure 1 Fig. 2, the fixed part 10 comprises a frame connecting part 14 and a first pivot part 12 connected to each other, the frame connecting part 14 is used to connect to the frame of a bicycle, the first pivot part 12 has oppositely arranged first pivot ends 12a, each of the first pivot ends 12a is pivotally connected to the connecting rod assembly 20.

[0050] One end of the connecting rod assembly 20 is pivotally connected to the fixed part 10; the other end of the connecting rod assembly 20 is pivotally connected to the movable part 30. The connecting rod assembly 20 comprises a first connecting rod 22 and a second connecting rod 24, one end of the first connecting rod 22 and one end of the second connecting rod 24 are pivotally connected to the first pivot part 12 of the fixed part 10 respectively; the other end of the first connecting rod 22 and the other end of the second connecting rod 24 are pivotally connected to a second pivot part 32 of the movable part 30 respectively, so that the first pivot part 12, the connecting rod assembly 20 and the second pivot part 32 form a four-bar linkage mechanism.

[0051] As shown in Figure 1 , Figure 2 and Figure 7 , the movable part 30 comprises the second pivot part 32 and a seat body 34 connected to each other. The second pivot part 32 has oppositely arranged second pivot ends 32a, each of the second pivot ends 32a is pivotally connected to the connecting rod assembly 20; the seat body 34 has an axial hole 342, one side of the seat body 34 facing the chain shifting arm 42 forms a first accommodating chamber 344. The chain guide part 40 comprises a chain shifting arm 42 and a shaft member 44 connected to the chain shifting arm 42, the shaft member 44 passes through the axial hole 342, wherein the damping assembly 60 comprises a housing 68, the housing 68 is combined to the other side of the seat body 34 away from the chain shifting arm 42, the housing 68 forms a second accommodating chamber 69 inside, the axial hole 342 communicates the first accommodating chamber 344 and the second accommodating chamber 69. During installation, the resilient member 50 is sleeved on the shaft member 44 and arranged in the first accommodating chamber 344, one end of the resilient member 50 is combined to the chain shifting arm 42 and the other end is combined to one side of the seat body 34, wherein the resilient member 50 is a torsion spring to provide biasing force of the shaft member 44 along a first direction D1 (see Figure 4 ), the first direction D1 is the rotation direction with the shaft center of the shaft member 44 as the rotation center, other resilient members capable of providing biasing force can also be used as the alternative of the torsion spring in the preferred embodiment.

[0052] As shown in Figure 4 and Figure 7As shown, the derailleur arm 42 of the chain guide 40 is rotatably pivotally connected to a guide wheel 422 and a tension wheel 424. The shaft 44 connected to the derailleur arm 42 includes a base shaft 442 and a pivot shaft 446. The base shaft 442 is coupled to the derailleur arm 42 and has a shaft 442a, a screw hole 442b, and an adjuster 442c. The shaft 442a is rotatably inserted through the shaft hole 342. The screw hole 442b is located at the outer end of the base shaft 442. The adjuster 442c is located at the inner end of the base shaft 442 and has multiple adjusting holes 443c around the base shaft 442. By selectively engaging one end of the elastic member 50 with one of the adjusting holes 443c, the fixed position of one end of the elastic member 50 is adjusted, thereby changing the spring position. The initial bias force of the component 50; the pivot shaft 446 has a first part 446a, a flange 446b and a second part 446c that are coaxial and connected in sequence. The first part 446a is a screw that passes through the shaft hole 342 and is screwed into the screw hole 442b of the base shaft 442. The flange 446b extends radially relative to the pivot shaft 446 and abuts against the periphery of one end of the shaft hole 342. The outer end of the second part 446c has a tool hole 446d, which allows a tool to rotate the pivot shaft 446.

[0053] like Figures 4 to 9 As shown, the damping assembly 60 includes three one-way bearings 65, an inner ring 61, an outer ring 62, a plurality of first damping plates 63, and a plurality of second damping plates 64. The one-way bearings 65 are fitted onto the shaft 44 and embedded in the inner surface of the inner ring 61; the outer surface of the inner ring 61 is coupled to the first damping plates 63, and the inner ring 61 is located within the outer ring 62; the inner surface of the outer ring 62 is coupled to the second damping plates 64 and fixed to the base 34.

[0054] In detail, the one-way bearings 65 are fitted onto the second portion 446c of the pivot shaft 446, and each one-way bearing 65 has a first fitting groove 652. The inner surface of the inner ring 61 has a first fitting block 612, which is embedded in each of the first fitting grooves 652. This allows the one-way bearings 65, the inner ring 61, and the first damping plates 63 to be housed in the second chamber 69. The inner periphery of each one-way bearing 65 can rotate freely in a first direction D1 relative to its outer periphery. Therefore, the shaft 44 can rotate freely in the first direction D1 relative to the inner ring 61 via the one-way bearings 65. In other preferred embodiments, the number of one-way bearings 65 can be adjusted to one or more as needed.

[0055] The first damping pieces 63 and the second damping pieces 64 are alternately arranged. The first damping pieces 63 have second engaging blocks 632, and the outer surface of the inner ring 61 has second engaging grooves 614, which nest the second engaging blocks 632, thereby fixing the first damping pieces 63 to the inner ring 61. The second damping pieces 64 have third engaging blocks 642, and the inner surface of the outer ring 62 has third engaging grooves 622, which nest the third engaging blocks 642, thereby fixing the second damping pieces 64 to the outer ring 62. When the shaft 44 rotates in the first direction D1, the shaft 44 does not drive the first damping pieces 63 to rotate in the first direction D1 relative to the second damping pieces 64. Thus, when the chain of the bicycle engages the guide wheel 422 and the tension wheel 424 of the derailleur arm 42, the biasing force of the elastic member 50 in the first direction D1 drives the derailleur arm 42 to rotate in the first direction D1 to provide chain tension.

[0056] The direction of the shaft 44 is defined as an axial direction L. The inner surface of the outer ring 62 has first ring grooves 624 on both sides of the axial direction L, and the outer surface of the inner ring 61 has second ring grooves 616 on both sides of the axial direction L. The first ring grooves 624 and the second ring grooves 616 are oppositely arranged. The damping assembly 60 includes two sealing members 67 and a damping material 66. Each sealing member 67 is a circular ring having an inner edge 672 and an outer edge 674. The outer edge 674 and the inner edge 672 of one sealing member 67 are embedded in one first ring groove 624 and one second ring groove 616, respectively. The outer edge 674 and the inner edge 672 of the other sealing member 67 are embedded in the other first ring groove 624 and the other second ring groove 616, respectively. Each sealing member can slide between the inner ring and the outer ring. The damping material 66 is filled between the first damping pieces 63 and the second damping pieces 64 and is sealed between the outer ring 62 and the inner ring 61 by the sealing members 67. The damping material can be oil or a fluid with a high viscosity coefficient.

[0057] When the chain of the bicycle is swung by external force, or the derailleur 40 is shaken or subjected to external force, causing the derailleur arm 42 to swing downward due to inertia, the shaft 44 of the derailleur 40 drives the first damping pieces 63 on the inner ring 61 to rotate in a second direction D2 opposite to the first direction D1, which is also the rotation direction of the shaft 44. At this time, the shaft 44 drives the first damping pieces 63 to rotate relative to the second damping pieces 64 through the one-way bearings 65. At this time, the damping material 66 provides damping for the rotation of the first damping pieces 63 relative to the second damping pieces 64, slowing down the speed and amplitude of the rotation of the derailleur arm 42 of the derailleur 40 relative to the shaft 44. Thus, the chain can quickly return to its original position after being swung by external force, and the problem of chain drop due to insufficient tension of the chain can be avoided.

[0058] In the preferred embodiment, the damping force of the damping material 66 can be adjusted in various ways to meet different application requirements. Specifically, the number of the first damping pieces 63 and the second damping pieces 64 can be adjusted to affect the damping effect. In addition, the damping material 66 can be replaced with a fluid with different viscosity coefficients to further optimize the damping assembly 60.

[0059] In summary, when the bicycle is ridden on uneven road surfaces, the rear derailleur 100 with damping function can produce damping effect through the cooperation of the damping assembly 60 and the one-way bearings 65, thereby avoiding excessive rotation of the derailleur arm 42 caused by external force when the chain is swung or flung, causing the biasing force of the elastic member 50 to fail to reset the derailleur arm 42, and thus causing the chain to drop due to insufficient tension. Since the present application can restore the position of the derailleur arm 42 in real time to maintain the tension of the chain, this design can ensure stable engagement between the chain and the sprocket, reducing the situation of bicycle failure caused by chain drop.

[0060] The above-described embodiments and / or implementations are only used to illustrate the preferred embodiments and / or implementations of the present application, and do not limit the implementation of the present application in any form. Any person skilled in the art can make some changes or modifications to other equivalent embodiments without departing from the technical means disclosed in the present application, but should be considered as the same technology or embodiment as the present application.

Claims

1. A rear transmission with a damping function, characterized in that The rear derailleur with damping function comprises a fixed part comprising a frame connecting part and a first pivot part; a link assembly comprising a first link and a second link, one end of the first link and one end of the second link are respectively pivoted to the first pivot part; a movable part comprising a second pivot part and a seat, the other end of the first link and the other end of the second link are respectively pivoted to the second pivot part, so that the first pivot part, the link assembly and the second pivot part form a four-bar linkage mechanism, the seat has a shaft hole; a chain guide part comprising a chain shift arm and a shaft member connected to the chain shift arm, a guide wheel and a tension wheel are rotatably pivoted to the chain shift arm, the shaft member passes through the shaft hole; a resilient member connected between the seat and the chain guide part and providing a biasing force for the rotation of the chain guide part; a damping assembly comprising an inner ring, an outer ring, a plurality of first damping pieces, a plurality of second damping pieces and at least one one-way bearing, the inner ring is located in the outer ring, and the outer surface of the inner ring is connected with the first damping pieces; the outer ring is fixed to the seat and the inner surface of the outer ring is connected with the second damping pieces; the first damping pieces and the second damping pieces are arranged alternately and spaced, and the first damping pieces and the second damping pieces are filled with a damping material; the at least one one-way bearing is embedded in the inner surface of the inner ring, the at least one one-way bearing is sleeved on the shaft member, and the shaft member can rotate freely relative to the inner ring in a first direction through the at least one one-way bearing; when the shaft member of the chain guide part drives the first damping pieces on the inner ring to rotate in a second direction opposite to the first direction through the at least one one-way bearing, the damping material provides damping for the rotation of the first damping pieces relative to the second damping pieces.

2. The rear transmission with damping function according to claim 1, characterized in that, The inner surface of the inner ring has a first embedding block, the at least one one-way bearing has a first embedding groove, and the first embedding block is embedded in the first embedding groove.

3. The rear transmission with damping function according to claim 2, characterized in that The outer surface of the inner ring has a second embedding groove, each of the first damping pieces has a second embedding block, and the second embedding groove nests the second embedding blocks.

4. The rear transmission with damping function according to claim 3, characterized in that The inner surface of the outer ring has a third embedding groove, each of the second damping pieces has a third embedding block, and the third embedding groove nests the third embedding blocks.

5. The rear transmission with damping function according to claim 1, characterized in that, The damping assembly comprises two sealing members, each of which is annular and has an inner edge and an outer edge.

6. The rear transmission with damping function according to claim 5, characterized in that The direction of the shaft center of the shaft member is defined as an axial direction, the inner surface of the outer ring has a first ring groove on both sides along the axial direction, the outer surface of the inner ring has a second ring groove on both sides along the axial direction, and each of the first ring groove and the second ring groove is oppositely arranged; the outer edge and the inner edge of one of the sealing members are embedded in one of the first ring groove and one of the second ring groove, respectively, and the outer edge and the inner edge of the other sealing member are embedded in the other first ring groove and the other second ring groove, respectively, and each of the sealing members can slide between the inner ring and the outer ring.

7. The rear transmission with damping function according to claim 1, characterized in that, The seat body forms a first chamber around the shaft hole on the side facing the derailleur arm; the damping assembly includes a housing combined with the seat body on the other side away from the derailleur arm, forming a second chamber with the seat body, and the shaft hole communicates the first and second chambers.

8. The rear transmission with damping function according to claim 7, characterized in that, The elastic member is a torsion spring and located in the first chamber, one end of the elastic member is combined with the derailleur arm and the other end is combined with the seat body.

9. The rear transmission with damping function according to claim 7, characterized in that, The shaft member includes a base shaft and a pivot shaft, the base shaft is combined with the derailleur arm and has a shaft rod, the shaft rod is rotatably arranged in the shaft hole, and the outer end of the base shaft has a screw hole; the pivot shaft has coaxial first, second and third parts in sequence, the first part is a screw rod and penetrates into the shaft hole, the flange abuts against the periphery of one end of the shaft hole, and the outer end of the second part has a tool hole.

10. The rear transmission with damping function according to claim 9, characterized in that, The at least one one-way bearing is sleeved on the second part of the pivot shaft.

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