TWI862295B - Bicycle rear derailleur - Google Patents

Abstract

A bicycle rear derailleur includes a base component, a movable component, a shaft, a chain guide, a one-way bearing, a transmission sleeve and a resistance applying mechanism. The movable component is coupled to the base component. The chain guide is pivotably disposed on the movable component via the shaft. The one-way bearing is sleeved on the shaft. The transmission sleeve is fixed on the one-way bearing. The resistance applying mechanism includes a first friction component and a second friction component. The first friction component is fixed to the movable component. The second friction component is assembled with the transmission sleeve via a screwing manner. The second friction component and a part of the transmission sleeve clamp the first friction component. When the chain guide is pivoted along a direction, the chain guide rotates the one-way bearing and the transmission sleeve together relative to the first friction component via the shaft so as to apply a torque to the second friction component via the first friction component for screwing the second friction component relative to the transmission sleeve.

Description

Bicycle rear gear

The present invention relates to a rear derailleur, in particular to a bicycle rear derailleur.

Generally speaking, the guide chain of a bicycle rear derailleur is pivoted to a movable member via a pivot fixed to it. When the rear derailleur is shifted up, the movable member moves toward the frame, driving the guide chain to move the chain from the smaller sprocket in the rear cassette to the larger sprocket. During the process of the chain moving from the smaller sprocket in the rear cassette to the larger sprocket, the tension of the chain causes the guide chain to pivot in one direction.

In order to prevent the chain from falling off due to the unexpected external force on the guide chain when the transmission is not shifting up, the bicycle manufacturer sets a one-way bearing on the pivot shaft and installs a friction plate and bolts. The bolts press against the friction plate so that when the guide chain pivots in the direction and drives the one-way bearing to rotate through the pivot shaft, the friction plate applies rotation resistance to the one-way bearing. However, after the one-way bearing rotates many times, the friction plate will wear and gradually become thinner, so that the bolts cannot press against the friction plate, resulting in a decrease in the rotation resistance of the friction plate to the one-way bearing. Therefore, after the rear transmission of the bicycle has been shifted up multiple times, the bolts need to be tightened manually to maintain the rotational resistance of the friction plate to the one-way bearing. This is a very inconvenient operation method for the user, so researchers in this field are working hard to improve this problem.

The present invention provides a bicycle rear shifter, which can improve the convenience of using the bicycle rear shifter.

A bicycle rear derailleur disclosed in an embodiment of the present invention comprises a base member, a movable member, a pivot shaft, a guide chain member, a one-way bearing, a torque transmission sleeve and a resistance applying member. The movable member can be movably coupled to the base member. The guide chain member is fixed to the pivot shaft and pivoted to the movable member through the pivot shaft. The one-way bearing is sleeved on the pivot shaft. The torque transmission sleeve is sleeved and fixed to the one-way bearing. When the guide chain member pivots in a first direction, it drives the one-way bearing and the torque transmission sleeve to rotate together through the pivot shaft. When the guide chain member pivots in a second direction opposite to the first direction, it drives the pivot shaft relative to the torque transmission sleeve to rotate. The resistance applying member includes a first friction member and a second friction member, the first friction member is fixed to the movable member, the second friction member is screwed to the torque transmission sleeve, the second friction member and a part of the torque transmission sleeve jointly clamp the first friction member, and a loosening direction and a tightening direction of the second friction member relative to the torque transmission sleeve are respectively the same as the first direction and the second direction. When the guide chain member pivots in the first direction, the one-way bearing and the torque transmission sleeve are driven by the pivot shaft to rotate relative to the first friction member, so as to provide the second friction member with a torque relative to the torque transmission sleeve along the tightening direction through the first friction member.

Another embodiment of the present invention discloses a bicycle rear derailleur, comprising a base member, a movable member, a pivot shaft, a guide chain member, a one-way bearing, a torque transmission sleeve, and a resistance applying member. The movable member can be movably coupled to the base member. The guide chain member is fixed to the pivot shaft and pivoted to the movable member through the pivot shaft. The one-way bearing is sleeved on the pivot shaft. The torque transmission sleeve is sleeved and fixed to the one-way bearing. When the guide chain member pivots in a first direction, it drives the one-way bearing and the torque transmission sleeve to rotate together through the pivot shaft. When the guide chain member pivots in a second direction opposite to the first direction, the pivot shaft drives the torque transmission sleeve to rotate. The resistance applying member includes a first friction member and a second friction member, the first friction member is fixed to the movable member, the second friction member includes a threaded portion and a contact portion, the contact portion radially protrudes from the threaded portion, the threaded portion has a contact surface, the threaded portion is threaded on the torque transmission sleeve, and the contact surface of the contact portion and a part of the torque transmission sleeve jointly clamp the first friction member.

Yet another embodiment of the present invention discloses a bicycle rear derailleur, comprising a base member, a movable member, a pivot shaft, a guide chain member, a one-way bearing, a torque transmission sleeve and a resistance applying member. The movable member can be movably coupled to the base member. The guide chain member is fixed to the pivot shaft and pivoted to the movable member through the pivot shaft. The one-way bearing is sleeved on the pivot shaft. The torque transmission sleeve comprises a sleeve portion and a threaded portion, the sleeve portion is sleeved and fixed on the one-way bearing, the sleeve portion has a contact surface, and the threaded portion protrudes from the contact surface along the axial direction of the sleeve portion. When the guide chain member pivots in a first direction, the one-way bearing and the torque transmission sleeve are driven to rotate together through the pivot shaft. When the guide chain member pivots in a second direction opposite to the first direction, the pivot shaft is driven to rotate relative to the torque transmission sleeve. The resistance applying member includes a first friction member and a second friction member, the first friction member is fixed to the movable member, the second friction member is screwed to the screwing part of the torque transmission sleeve, and the contact surface of the second friction member and the sleeve part of the torque transmission sleeve jointly clamps the first friction member.

According to the bicycle rear derailleur disclosed in the above embodiment, when the guide chain member pivots in the first direction, the one-way bearing and the torque transmission sleeve are driven to rotate relative to the first friction member through the pivot shaft, so that the first friction member provides a torque in the tightening direction of the second friction member relative to the torque transmission sleeve. When the first friction member gradually becomes thinner due to wear, the torque applied to the second friction member can cause the second friction member to automatically tighten relative to the torque transmission sleeve and press tightly against the first friction member. Therefore, after the bicycle rear derailleur has shifted up multiple times, it is not necessary to manually tighten the second friction member to adjust the rotation resistance of the first friction member to the torque transmission sleeve, thereby improving the convenience of use of the bicycle rear derailleur.

The above description of the content of the present invention and the following description of the implementation method are used to demonstrate and explain the principle of the present invention and provide a further explanation of the scope of the patent application of the present invention.

Please refer to Figures 1 and 2. Figure 1 is a three-dimensional schematic diagram of a bicycle rear derailleur disclosed according to an embodiment of the present invention. Figure 2 is an exploded schematic diagram of the bicycle rear derailleur of Figure 1.

In this embodiment, the bicycle rear derailleur 1 includes a base member 10, a movable member 20, a pivot shaft 30, a guide chain member 40, a one-way bearing 50, a torque transmission sleeve 60, and a resistance applying member 70. In addition, the bicycle rear derailleur 1 may further include a connecting rod member 80, a locking accessory 90, and an elastic member 100.

Next, please refer to Figures 2 to 5. Figure 3 is a partial planar cross-sectional schematic diagram of the bicycle rear derailleur of Figure 1. Figure 4 is a partial enlarged planar cross-sectional schematic diagram of the bicycle rear derailleur of Figure 3. Figure 5 is a partial three-dimensional cross-sectional schematic diagram of the bicycle rear derailleur of Figure 1.

The movable member 20 is movably coupled to the base member 10 through the connecting rod member 80. Specifically, the connecting rod member 80 includes a first connecting rod 81 and a second connecting rod 82. The opposite sides of the first connecting rod 81 are respectively pivoted on the base member 10 and the movable member 20, while the opposite sides of the second connecting rod 82 are respectively pivoted on the base member 10 and the movable member 20. In this way, the base member 10, the first connecting rod 81, the second connecting rod 82 and the movable member 20 together form a four-link structure.

In this embodiment, the movable member 20 has a through hole 21 and a receiving groove 22 surrounding the through hole 21. The guide chain member 40 includes a frame 41, a guide chain wheel 42 and a tension wheel 43. The frame 41 of the guide chain member 40 is fixed to the pivot 30 through a locking member 90, and the pivot 30 is rotatably disposed in the through hole 21 of the movable member 20, so that the frame 41 is pivoted to the movable member 20 through the pivot 30. The guide chain wheel 42 and the tension wheel 43 are rotatably disposed on the frame 41, the guide chain wheel 42 is used to guide the chain (not shown), and the tension wheel 43 is used to tighten the chain.

The elastic member 100 is, for example, a torsion spring, and is disposed in the receiving groove 22 of the movable member 20. One end of the elastic member 100 is fixed to the movable member 20, and the other end of the elastic member 100 is fixed to the frame 41 of the guide chain member 40. The elastic member 100 is used to apply a force to the guide chain member 40 to pivot in a second direction D2, so that the tension wheel 43 of the guide chain member 40 tightens the chain.

The one-way bearing 50 is located in the through hole 21 of the movable member 20 and is sleeved on the pivot 30. Specifically, the one-way bearing 50 includes an inner liner 51 and an outer liner 52. The pivot 30 is engaged with the inner liner 51 of the one-way bearing 50, and the inner liner 51 can only rotate in one direction (i.e., the second direction D2) relative to the outer liner 52. In this way, when the guide chain member 40 pivots relative to the movable member 20 along the second direction D2, the pivot 30 can easily drive the inner liner 51 of the one-way bearing 50 to rotate relative to the outer liner 52 along the second direction D2. On the contrary, when the guide chain member 40 pivots relative to the movable member 20 in a first direction D1 opposite to the second direction D2, the pivot shaft 30 engages the inner liner 51 and the outer liner 52 of the one-way bearing 50, so that the entire one-way bearing 50 rotates together in the first direction D1.

The torque transmission sleeve 60 includes a sleeve portion 61 and a threaded portion 62 connected to each other, and the sleeve portion 61 and the threaded portion 62 are, for example, formed as one piece. Specifically, the sleeve portion 61 is cylindrical. The sleeve portion 61 has a contact surface 611 in the axial direction. The threaded portion 62 is, for example, a stud structure, and protrudes from the sleeve portion 61 along the axial direction of the sleeve portion 61 from the contact surface 611. The threaded portion 62 has a threaded structure 621, and the threaded structure 621 is at a minimum distance L from the contact surface 611 of the sleeve portion 61. The sleeve portion 61 of the torque transmission sleeve 60 is located in the through hole 21 of the movable component 20, and is tightly mounted on the outer sleeve portion 52 of the one-way bearing 50. That is, the sleeve portion 61 of the torque transmission sleeve 60 is fixed to the outer sleeve portion 52 of the one-way bearing 50. Thus, when the guide chain member 40 pivots relative to the movable member 20 along the first direction D1, the guide chain member 40 drives the pivot shaft 30, the one-way bearing 50 and the torque transmission sleeve 60 to rotate together; when the guide chain member 40 pivots relative to the movable member 20 along the second direction D2, the guide chain member 40 drives the pivot shaft 30 to rotate relative to the torque transmission sleeve 60.

The resistance applying member 70 includes a first friction member 71 and a second friction member 72. The first friction member 71 is, for example, a sheet-shaped body. The first friction member 71 is fixed to the movable member 20 and abuts against the contact surface 611 of the sleeve portion 61 of the torque transmitting sleeve 60, and the threaded portion 62 of the torque transmitting sleeve 60 passes through the first friction member 71. The minimum distance L from the thread structure 621 of the threaded portion 62 of the torque transmitting sleeve 60 to the contact surface 611 of the sleeve portion 61 is less than the thickness T of the first friction member 71. The second friction member 72 includes a threaded portion 721 and a contact portion 722 connected to each other, and the threaded portion 721 and the contact portion 722 are, for example, integrally formed. The threaded portion 721 is, for example, a hollow cylinder and has a screw hole structure 7211. The contact portion 722 radially protrudes from the threaded portion 721, and has a contact surface 7221. The threaded portion 62 of the torque transmission sleeve 60 is threadedly engaged with the screw hole structure 7211 of the threaded portion 721 of the second friction member 72, and a loosening direction and a tightening direction of the threaded portion 721 of the second friction member 72 relative to the torque transmission sleeve 60 are respectively the same as the first direction D1 and the second direction D2. That is, when the second friction member 72 rotates relative to the torque transmission sleeve 60 along the first direction D1, the second friction member 72 can be gradually loosened from the torque transmission sleeve 60; when the second friction member 72 rotates relative to the torque transmission sleeve 60 along the second direction D2, the second friction member 72 can be gradually tightened to the torque transmission sleeve 60. The first friction member 71 is sandwiched between the contact surface 7221 of the contact portion 722 of the second friction member 72 and the contact surface 611 of the sleeve portion 61 of the torque transmission sleeve 60.

In this embodiment, the bicycle rear derailleur 1 may further include a cover 110, which is mounted on the movable member 20 to shield the first friction member 71, the second friction member 72 and the threaded portion 62 of the torque transmission sleeve 60. It should be noted that the cover 110 is an optional component. In other embodiments, the bicycle rear derailleur may not have a cover.

Next, please refer to FIG. 6 , which is a partial three-dimensional cross-sectional schematic diagram of the guide chain component of FIG. 3 after pivoting along the first direction.

During the process of upshifting of the bicycle rear derailleur 1 (moving the chain from the sprocket with a smaller outer diameter in the rear flywheel to the sprocket with a larger outer diameter), the guide chain member 40 will pivot relative to the movable member 20 along the first direction D1 due to the tension of the chain, so that the guide chain member 40 drives the one-way bearing 50 and the torque transmission sleeve 60 to rotate along the first direction D1 through the pivot 30. When the one-way bearing 50 and the torque transmission sleeve 60 rotate together in the first direction D1, the contact surface 7221 of the contact portion 722 of the second friction member 72 contacts the first friction member 71, so that the first friction member 71 provides the second friction member 72 with a torque in the tightening direction (i.e., the second direction D2) relative to the torque transmission sleeve 60. In this way, after the rear transmission 1 of the bicycle has shifted up multiple times, the first friction member 71 gradually becomes thinner due to multiple frictions between the contact surface 611 of the sleeve portion 61 of the torque transmission sleeve 60 and the contact surface 7221 of the contact portion 722 of the second friction member 72. The aforementioned torque can automatically tighten the second friction member 72, so that the second friction member 72 presses the first friction member 71 against the contact surface 611 of the sleeve portion 61 of the torque transmission sleeve 60, so as to maintain the rotational resistance of the first friction member 71 to the torque transmission sleeve 60. Therefore, after the bicycle rear gear shifter 1 has been shifted up multiple times, it is not necessary to manually tighten the second friction member 72 to adjust the rotational resistance of the first friction member 71 on the torque transmission sleeve 60, thereby improving the convenience of use of the bicycle rear gear shifter 1.

In addition, during the process of the aforementioned torque automatically tightening the second friction member 72, no obvious sound is emitted, thereby improving the user experience of the bicycle rear transmission 1.

Furthermore, the minimum distance L between the thread structure 621 of the threaded portion 62 of the torque transmission sleeve 60 and the contact surface 611 of the sleeve portion 61 is less than the thickness T of the first friction member 71, which ensures that the first friction member 71 can continue to provide torque to the second friction member 72 to automatically lock the second friction member 72 before it is worn to a certain extent, so as to force the first friction member 71 to maintain sufficient rotation resistance to the torque transmission sleeve 60. In other words, the above configuration allows the first friction member 71 to have the functions of automatically locking the second friction member 72 and providing rotation resistance to the torque transmission sleeve 60 before it is worn to a certain extent.

It should be noted that the structures of the torque transmission sleeve 60 and the second friction member 72 are merely examples. As long as the torque transmission sleeve and the second friction member are in a threaded relationship and the two clamp the first friction member, the structures of the torque transmission sleeve and the second friction member can be changed arbitrarily.

Next, please refer to FIG. 7 , which is a partial cross-sectional schematic diagram of a bicycle rear transmission according to another embodiment of the present invention.

The bicycle rear derailleur 1a of this embodiment is similar to the bicycle rear derailleur 1 described with reference to FIGS. 1 to 6 , and the difference between the two mainly lies in the different coupling structures between the torque transmission sleeve and the resistance applying member, so the following mainly describes this difference, and the same parts of the two are not repeated.

In the present embodiment, the torque transmission sleeve 60a includes a sleeve portion 61a and a threaded portion 62a connected to each other, and the sleeve portion 61a and the threaded portion 62a are, for example, formed as one piece. Specifically, the sleeve portion 61a is cylindrical. The sleeve portion 61a has a contact surface 611a in the axial direction. The threaded portion 62a is, for example, a columnar structure, and protrudes from the sleeve portion 61a along the axial direction of the sleeve portion 61a from the contact surface 611a. The threaded portion 62a has a screw hole 621a. The sleeve portion 61a of the torque transmission sleeve 60a is located in the through hole 21 of the movable component 20, and is tightly sleeved on the outer liner 52 of the one-way bearing 50. That is, the sleeve portion 61a of the torque transmission sleeve 60a is fixedly connected to the outer sleeve portion 52 of the one-way bearing 50. Thus, when the guide chain member 40 pivots relative to the movable member 20 along the first direction D1 (as shown in FIG. 5 ), the guide chain member 40 drives the pivot shaft 30, the one-way bearing 50 and the torque transmission sleeve 60a to rotate together; when the guide chain member 40 pivots relative to the movable member 20 along the second direction D2 (as shown in FIG. 5 ), the guide chain member 40 drives the pivot shaft 30 to rotate relative to the torque transmission sleeve 60a.

The resistance applying member 70a includes a first friction member 71a, a second friction member 72a and a locking attachment 73a. The first friction member 71a is, for example, a sheet-shaped body. The first friction member 71a is fixed to the movable member 20 and abuts against the contact surface 611a of the sleeve portion 61a of the torque transmission sleeve 60a, and the threaded portion 62a of the torque transmission sleeve 60a passes through the first friction member 71a. The second friction member 72a is, for example, a sheet-shaped body. The second friction member 72a is, for example, sleeved on the threaded portion 62a of the torque transmission sleeve 60a with an irregular hole structure, and is fixed to the threaded portion 62a of the torque transmission sleeve 60a, and the first friction member 71a is between the second friction member 72a and the contact surface 611a of the sleeve portion 61a of the torque transmission sleeve 60a. The locking attachment 73a is, for example, a bolt, including a head portion 731a and a stud portion 732a connected axially. The stud portion 732a of the locking attachment 73a is screwed into the screw hole 621a of the screw-engaging portion 62a, and the head portion 731a of the locking attachment 73a presses against a side of the second friction member 72a away from the first friction member 71a. In other words, the head portion 731a of the locking attachment 73a presses the first friction member 71a and the second friction member 72a against the contact surface 611a of the sleeve portion 61a of the torque transmission sleeve 60a.

In this embodiment, when the guide chain member 40 pivots relative to the movable member 20 along the first direction D1, the guide chain member 40 drives the pivot shaft 30, the one-way bearing 50, the torque transmission sleeve 60a and the second friction member 72a fixed to the torque transmission sleeve 60a to rotate together. In the process of the torque transmission sleeve 60a and the second friction member 72a rotating together, the two rotate relative to the first friction member 71a, so when the head 731a of the lock attachment 73a presses the first friction member 71a and the second friction member 72a against the contact surface 611a of the sleeve portion 61a of the torque transmission sleeve 60a, the first friction member 71a will apply resistance to the second friction member 72a and the torque transmission sleeve 60a in rotation. This resistance is transmitted to the guide chain member 40 via the one-way bearing 50 and the pivot shaft 30. Thus, the guide chain member 40 is not easy to pivot along the first direction D1, thereby preventing the guide chain member 40 from swinging along the first direction D1 due to unexpected external force and causing the chain to fall.

In this embodiment, when the guide chain member 40 pivots relative to the movable member 20 along the first direction D1, the torque transmission sleeve 60a drives the locking accessory 73a to rotate together, but the present invention is not limited thereto. In other embodiments, when the guide chain member pivots relative to the movable member along the first direction, the torque transmission sleeve may not drive the locking accessory to rotate together, but rotate relative to the locking accessory. For example, a stopper may be added to the movable member so that when the guide chain member pivots relative to the movable member along the first direction, the stopper abuts against the locking accessory, thereby providing the locking accessory with a torque in the tightening direction relative to the torque transmission sleeve. In this way, when the first friction member and the second friction member gradually become thinner due to wear, the torque applied to the lock accessory can automatically tighten the lock accessory relative to the torque transmission sleeve and tightly press against the first friction member and the second friction member. Therefore, after the bicycle rear shifter has shifted up multiple times, it is not necessary to manually tighten the lock accessory to adjust the rotational resistance of the first friction member to the torque transmission sleeve, thereby improving the convenience of use of the bicycle rear shifter.

According to the bicycle rear derailleur disclosed in the above embodiment, when the guide chain member pivots in the first direction, the one-way bearing and the torque transmission sleeve are driven to rotate relative to the first friction member through the pivot shaft, so that the first friction member provides a torque in the tightening direction of the second friction member relative to the torque transmission sleeve. When the first friction member gradually becomes thinner due to wear, the torque applied to the second friction member can cause the second friction member to automatically tighten relative to the torque transmission sleeve and press tightly against the first friction member. Therefore, after the bicycle rear derailleur has shifted up multiple times, it is not necessary to manually tighten the second friction member to adjust the rotation resistance of the first friction member to the torque transmission sleeve, thereby improving the convenience of use of the bicycle rear derailleur.

In addition, the minimum distance between the thread structure of the threaded part of the torque transmission sleeve and the contact surface of the sleeve part is set to be less than the thickness of the first friction member, which can ensure that the first friction member can continue to provide torque to the second friction member to automatically lock the second friction member before it is worn to a certain extent, so as to force the first friction member to maintain sufficient rotation resistance to the torque transmission sleeve. In other words, the above-mentioned configuration of the first friction member can have the functions of automatically locking the second friction member and providing rotation resistance to the torque transmission sleeve before it is worn to a certain extent.

Although the present invention is disclosed as above with the aforementioned preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be subject to the scope of the patent application attached to this specification.

1,1a: Bicycle rear derailleur

10: Base components

20:Active components

21: Piercing

22: Receiving groove

30: Pivot

40: Guide chain component

41:Frame

42: Guide sprocket

43: Tension wheel

50: One-way bearing

51:Inner lining

52: Outer lining

60,60a: Torque transmission sleeve

61,61a: Set

611,611a: Contact surface

62, 62a: screw-on part

621: Thread structure

621a: screw hole

70,70a: Resistance applying member

71, 71a: first friction member

72, 72a: second friction member

721: screw-on part

7211:Screw hole structure

722: Contact

7221:Contact surface

73a: Lock attachment

731a: Head

732a: Stud

80: Connecting rod component

81: First Link

82: Second connecting rod

90: Lock attachment

100: Elastic parts

110: Cover

D1: First direction

D2: Second direction

L: Distance

T:Thickness

FIG. 1 is a three-dimensional schematic diagram of a bicycle rear derailleur disclosed according to one embodiment of the present invention. FIG. 2 is an exploded schematic diagram of the bicycle rear derailleur of FIG. 1 . FIG. 3 is a partial planar cross-sectional schematic diagram of the bicycle rear derailleur of FIG. 1 . FIG. 4 is a partially enlarged planar cross-sectional schematic diagram of the bicycle rear derailleur of FIG. 3 . FIG. 5 is a partial three-dimensional cross-sectional schematic diagram of the bicycle rear derailleur of FIG. 1 . FIG. 6 is a partial three-dimensional cross-sectional schematic diagram of the guide chain component of FIG. 3 after pivoting along the first direction. FIG. 7 is a partial cross-sectional schematic diagram of a bicycle rear derailleur disclosed according to another embodiment of the present invention.

10: Base components

20: Movable components

21:Piercing

30: pivot

40: Guide chain components

41:Frame

42: Guide chain wheel

43: Tension wheel

50: One-way bearing

60: Torque transmission sleeve

61: Set-up Department

611: Contact surface

62: Screw-on part

70: Resistance applying member

71: First friction member

72: Second friction member

721: Screw-on part

7211: Screw hole structure

722: Contact part

7221:Contact surface

80: Connecting rod component

81: First connecting rod

82: Second connecting rod

90: Lock attachments

100: Elastic parts

110: Cover

Claims (11)

A bicycle rear derailleur comprises: a base member; a movable member movably coupled to the base member; a pivot shaft; a guide chain member fixed to the pivot shaft and pivoted to the movable member through the pivot shaft; a one-way bearing sleeved on the pivot shaft; a torque transmission sleeve sleeved and fixed to the one-way bearing, wherein the guide chain member drives the one-way bearing and the torque transmission sleeve to rotate together through the pivot shaft when pivoting in a first direction; the guide chain member drives the pivot shaft to rotate relative to the torque transmission sleeve when pivoting in a second direction opposite to the first direction; and a resistance applying member comprising a first friction member and a second friction member, The first friction member is fixed to the movable member, the second friction member is screwed to the torque transmission sleeve, the second friction member and a part of the torque transmission sleeve directly contact the first friction member and jointly clamp the first friction member, and a loosening direction and a tightening direction of the second friction member relative to the torque transmission sleeve are respectively the same as the first direction and the second direction; wherein, when the guide chain member pivots in the first direction, the one-way bearing and the torque transmission sleeve are driven by the pivot shaft to rotate relative to the first friction member, so as to provide the second friction member with a torque relative to the torque transmission sleeve along the tightening direction through the first friction member. As described in claim 1, the torque transmission sleeve comprises a sleeve portion and a threaded portion, the sleeve portion is sleeved and fixed on the one-way bearing, the sleeve portion has a contact surface, the threaded portion protrudes from the contact surface along the axial direction of the sleeve portion, the threaded portion is inserted through the first friction member and threadedly engaged with the second friction member, and the second friction member and the contact surface of the sleeve portion jointly clamp the first friction member. A bicycle rear derailleur as described in claim 2, wherein the threaded portion is a stud structure. A bicycle rear derailleur as described in claim 2, wherein the sleeve portion and the threaded portion of the torque transmission sleeve are integrally formed. A bicycle rear derailleur as described in claim 2, wherein the threaded portion of the torque transmission sleeve has a threaded structure, and the minimum distance from the threaded structure to the contact surface of the sleeve portion is less than the thickness of the first friction member. As described in claim 1, the second friction member comprises a threaded portion and a contact portion, the contact portion radially protrudes from the threaded portion, the contact portion has a contact surface, the threaded portion is threaded on the torque transmission sleeve, and the contact surface of the contact portion and a portion of the torque transmission sleeve jointly clamp the first friction member. A bicycle rear transmission as described in claim 6, wherein the threaded portion of the second friction member has a screw hole structure. A bicycle rear derailleur as described in claim 6, wherein the threaded portion and the contact portion of the second friction member are integrally formed. The bicycle rear derailleur as described in claim 1 further comprises an elastic member, the two opposite ends of which are respectively connected to the movable member and the guide chain member, and the elastic member is used to exert a force on the guide chain member to pivot in the second direction. A bicycle rear derailleur comprises: a base member; a movable member movably coupled to the base member; a pivot shaft; a guide chain member fixed to the pivot shaft and pivoted to the movable member through the pivot shaft; a one-way bearing sleeved on the pivot shaft; a torque transmission sleeve sleeved and fixed to the one-way bearing, wherein when the guide chain member pivots in a first direction, the one-way bearing and the torque transmission sleeve are driven to rotate together through the pivot shaft; when the guide chain member pivots in a second direction opposite to the first direction, the guide chain member pivots in a second direction opposite to the first direction. When the pivot is driven to rotate relative to the torque transmission sleeve; and a resistance applying member, including a first friction member and a second friction member, the first friction member is fixed to the movable member, the second friction member includes a threaded portion and a contact portion, the contact portion radially protrudes from the threaded portion, the contact portion has a contact surface, the threaded portion is threaded on the torque transmission sleeve, and the contact surface of the contact portion and a part of the torque transmission sleeve directly contact the first friction member to jointly clamp the first friction member. A bicycle rear derailleur comprises: a base member; a movable member movably coupled to the base member; a pivot shaft; a guide chain member fixed to the pivot shaft and pivoted to the movable member through the pivot shaft; a one-way bearing sleeved on the pivot shaft; a torque transmission sleeve comprising a sleeve portion and a threaded portion, the sleeve portion sleeved and fixed to the one-way bearing, the sleeve portion having a contact surface, the threaded portion protruding from the contact surface along the axial direction of the sleeve portion, wherein the guide chain member pivots in a first direction through the pivot shaft. The shaft drives the one-way bearing and the torque transmission sleeve to rotate together; the guide chain component drives the pivot shaft to rotate relative to the torque transmission sleeve when pivoting in a second direction opposite to the first direction; and a resistance applying component includes a first friction member and a second friction member, the first friction member is fixed to the movable component, the second friction member is screwed into the screwed portion of the torque transmission sleeve, and the contact surface of the second friction member and the sleeve portion of the torque transmission sleeve directly contacts the first friction member to jointly clamp the first friction member.

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