Bicycle rear derailleur

Abstract

A bicycle rear derailleur includes a base member, a movable member, a first pivot, a second pivot, a third pivot, a fourth pivot, a linkage assembly, a battery assembly, and a chain guide member. The base member is mounted on a frame. One side of the linkage assembly is pivotally connected to the base member via the first and second pivots, and the other side of the linkage assembly is pivotally connected to the movable member via the third and fourth pivots. The battery assembly is disposed on one of the first, second, third, and fourth pivots, and is separate from the base member, the movable member, and the linkage assembly. The chain guide member is pivotally connected to the movable member.

Description

Technical Field

[0001] This invention relates to a bicycle rear derailleur. Prior Technology

[0002] With advancements in technology, bicycle components have evolved from mechanical to electronic. Take the electronic rear derailleur, for example. It is powered by a motor that drives the linkage mechanism and chain guide, allowing the chain to move between different sized sprockets in the rear freewheel. The motor's operation requires battery power, and the battery's placement must consider factors such as the overall appearance of the rear derailleur, the complexity of the mechanism design, and whether it will interfere with the normal operation of the linkage mechanism. Therefore, researchers in this field are currently working to find the optimal battery placement. Summary of the Invention

[0003] The present invention provides a rear derailleur for bicycles, the battery of which can be installed with a simple mechanism design, minimizing the impact on the aesthetic appearance of the bicycle, and without affecting the movement of the linkage mechanism.

[0004] An embodiment of the present invention discloses a bicycle rear derailleur, comprising a base member, a movable member, a first pivot, a second pivot, a third pivot, a fourth pivot, a linkage assembly, a battery assembly, and a chain guide member. The base member is mounted on a frame. One side of the linkage assembly is pivotally connected to the base member via the first and second pivots, and the other side of the linkage assembly is pivotally connected to the movable member via the third and fourth pivots. The battery assembly is disposed on one of the first, second, third, and fourth pivots, and is separate from the base member, the movable member, and the linkage assembly. The chain guide member is pivotally connected to the movable member.

[0005] Another embodiment of the present invention discloses a bicycle rear derailleur, comprising a base member, a movable member, a linkage assembly, a battery assembly, a motor, an output shaft, a linkage mechanism, and a chain guide member. One side of the linkage assembly is pivotally connected to the base member, and the other side of the linkage assembly is pivotally connected to the movable member, such that the base member, the movable member, and the linkage assembly together constitute a linkage mechanism. The battery assembly is disposed on the linkage mechanism. The motor is disposed on the linkage mechanism and electrically connected to the battery assembly. The output shaft is connected to the motor. The linkage mechanism includes a first linkage member and a second linkage member; the first linkage member is connected to the output shaft and the linkage assembly, and the second linkage member is connected to the output shaft and the battery assembly. The chain guide member is pivotally connected to the movable member.

[0006] Another embodiment of the present invention discloses a bicycle rear derailleur, comprising a base member, a movable member, a linkage assembly, a battery assembly, a motor, and a chain guide member. One side of the linkage assembly is pivotally connected to the base member, and the other side of the linkage assembly is pivotally connected to the movable member, such that the base member, movable member, and linkage assembly together constitute a linkage mechanism. The battery assembly is movably disposed in the linkage mechanism and is movable relative to the base member, movable member, and linkage assembly. The motor is disposed in the linkage mechanism and electrically connected to the battery assembly, and the motor drives the linkage assembly and the battery assembly. The chain guide member is pivotally connected to the movable member.

[0007] According to the bicycle rear derailleur disclosed in the above embodiments, by configuring the battery assembly on one of the first pivot, second pivot, third pivot, and fourth pivot, and separating the battery assembly from the base member, moving member, and linkage assembly, the battery assembly can be configured with a simple mechanism design, minimizing impact on the aesthetics of the bicycle's appearance, and without affecting the movement of the linkage assembly.

[0008] The above description of the content of this invention and the following description of the embodiments are used to demonstrate and explain the principles of this invention, and to provide a further explanation of the scope of the patent application of this invention. Simple Explanation of the Diagram

[0009] Figure 1 is a perspective view of the bicycle rear derailleur disclosed in the first embodiment of the present invention. Figure 2 is a perspective view of the rear derailleur of the bicycle in Figure 1 from another angle. Figure 3 is a partial side view of the rear derailleur of the bicycle in Figure 1. Figure 4 is a partial top view of the rear derailleur of the bicycle in Figure 1. Figure 5 is a partial front view of the rear derailleur of the bicycle in Figure 1. Figure 6 is a partial rear view of the bicycle's rear derailleur shown in Figure 1. Figure 7 is a top view of the first transmission gear, the second transmission gear, and the toothed belt in Figure 5. Figure 8 is a perspective view of the bicycle rear derailleur disclosed in the second embodiment of the present invention. Figure 9 is a perspective view of the bicycle's rear derailleur as shown in Figure 8. Figure 10 is a partial cross-sectional view of the rear derailleur of the bicycle shown in Figure 8. Figure 11 is a perspective view of the bicycle rear derailleur disclosed in the third embodiment of the present invention. Figure 12 is a perspective view of the rear derailleur of the bicycle in Figure 11 from another angle. Implementation

[0010] Please refer to Figures 1 and 2. Figure 1 is a perspective view of the bicycle rear derailleur 1 disclosed in the first embodiment of the present invention. Figure 2 is a perspective view of the bicycle rear derailleur 1 of Figure 1 from another angle.

[0011] The bicycle rear derailleur 1 includes a base member 2, a movable member 3, a first pivot 4, a second pivot 5, a third pivot 6, a fourth pivot 7, a linkage assembly 8, a battery assembly 9, and a chain guide member 10. The base member 2 is mounted on a frame F. One side of the linkage assembly 8 is pivotally connected to the base member 2 via the first pivot 4 and the second pivot 5, and the other side of the linkage assembly 8 is pivotally connected to the movable member 3 via the third pivot 6 and the fourth pivot 7. The battery assembly 9 is disposed on one of the first pivot 4, the second pivot 5, the third pivot 6, and the fourth pivot 7, and is separate from the base member 2, the movable member 3, and the linkage assembly 8. This separation means that the battery assembly 9 is not directly disposed on the aforementioned components, but is connected to them via at least one component. The chain guide member 10 is pivotally connected to the movable member 3.

[0012] Next, please refer to Figure 3, which is a partial side view of the rear derailleur 1 of the bicycle in Figure 1.

[0013] In some embodiments, the base member 2 can be mounted on the frame F along a mounting axis M (as shown in FIG. 1), defining a plane P perpendicular to the central axes C1, C2, C3, and C4 of the first pivot 4, the second pivot 5, the third pivot 6, and the fourth pivot 7, with the mounting axis M forming an acute angle θ with plane P, wherein the acute angle θ is, for example, 15 degrees, but is not limited thereto. The angle between the mounting axis M and plane P can be adjusted according to actual needs. For example, in other embodiments, the angle between the mounting axis M and plane P can be 90 degrees, that is, the mounting axis M is perpendicular to plane P.

[0014] Next, please refer to Figures 1, 2 and 4. Figure 4 is a partial top view of the rear derailleur 1 of the bicycle in Figure 1.

[0015] In some embodiments, the linkage assembly 8 may include an outer link 81 and an inner link 82. One end of the outer link 81 and one end of the inner link 82 are pivotally connected to the base member 2 via a first pivot 4 and a second pivot 5, respectively. The other ends of the outer link 81 and the inner link 82 are pivotally connected to the movable member 3 via a third pivot 6 and a fourth pivot 7, respectively. The base member 2, the movable member 3, and the linkage assembly 8 together constitute a linkage mechanism LM (i.e., a four-bar linkage). The base member 2, the movable member 3, and the linkage assembly 8 together define an internal space S. The internal space S is, for example, the space surrounded by the plane P1 containing the first pivot 4 and the second pivot 5, the plane P2 containing the first pivot 4 and the third pivot 6, the plane P3 containing the third pivot 6 and the fourth pivot 7, and the plane P4 containing the fourth pivot 7 and the first pivot 4. The battery assembly 9 is at least partially located within the internal space S.

[0016] In some embodiments, the outer link 81 may include two arms 811 and a connecting portion 812. The two arms 811 extend from the same side of the connecting portion 812 in the same direction and are separate from each other. The two arms 811 of the outer link 81 are pivotally connected to the base member 2 via a first pivot 4, and the connecting portion 812 of the outer link 81 is pivotally connected to the movable member 3 via a third pivot 6. The battery assembly 9 is partially located between the two arms 811 of the outer link 81.

[0017] In some embodiments, the inner link 82 may include two links 821. One end of the two links 821 of the inner link 82 is pivotally connected to the base member 2 via a second pivot 5, and the other end of the two links 821 of the inner link 82 is pivotally connected to the movable member 3 via a fourth pivot 7. The battery assembly 9 is partially located between the two links 821 of the inner link 82.

[0018] It should be noted that the structure of the outer connecting rod 81 and the inner connecting rod 82 can be modified according to requirements and is not limited to the above description.

[0019] In some embodiments, the battery assembly 9 may be fixed to a first pivot 4 and a second pivot 5. For example, the battery assembly 9 includes a battery housing 91 and a battery 92 housed in the battery housing 91, the battery housing 91 being fixed to the first pivot 4 and the second pivot 5.

[0020] It should be noted that the battery assembly 9 is not limited to being fixed to the first pivot 4 and the second pivot 5. In other embodiments, the battery assembly 9 may be fixed to other pivots, or only to one of the first pivot 4, the second pivot 5, the third pivot 6, and the fourth pivot 7.

[0021] Next, please refer to Figures 5 and 6. Figure 5 is a partial front view of the rear derailleur 1 of the bicycle in Figure 1. Figure 6 is a partial rear view of the rear derailleur 1 of the bicycle in Figure 1.

[0022] In some embodiments, the bicycle rear derailleur 1 may further include a motor 11, an output shaft 12, and a linkage mechanism 13. The motor 11 is disposed within the base member 2 and is electrically connected to the battery assembly 9, for example, via wires (not shown). The output shaft 12 is partially located within the base member 2 and connected to the motor 11. The linkage mechanism 13 is located outside the base member 2 and is connected to the portion of the output shaft 12 located outside the base member 2 and the inner link 82 of the linkage assembly 8.

[0023] In some embodiments, the linkage mechanism 13 may be a rotating arm, with one end of the linkage mechanism 13 fixed to the output shaft 12, and the other end of the linkage mechanism 13 pivotally connected to the inner link 82 of the link assembly 8.

[0024] In some embodiments, the bicycle rear derailleur 1 may further include a plurality of main drive gears 14. These main drive gears 14 are disposed within the base member 2, and the motor 11 is connected to the output shaft 12 through these main drive gears 14. Thus, the power output by the motor 11 can be transmitted to the inner link 82 via these main drive gears 14, the output shaft 12, and the linkage mechanism 13, thereby driving the integral linkage mechanism LM and the chain guide member 10 connected thereto (as shown in FIG. 1) to move, so that the chain can move between different sized sprockets in the rear freewheel.

[0025] In some embodiments, the bicycle rear derailleur 1 may further include a control circuit board 15. The control circuit board 15 is disposed within the base member 2 and is electrically connected to the battery assembly 9 and the motor 11, for example, via wires (not shown). The control circuit board 15 includes a substrate 151, a control unit 152, and a wireless communication unit 153, with the control unit 152 and the wireless communication unit 153 disposed on the substrate 151. The wireless communication unit 153 is, for example, a Bluetooth transceiver, for receiving shift signals (such as upshift or downshift signals). After the wireless communication unit 153 receives a shift signal, the control unit 152 drives the motor 11 to operate, and the power of the motor 11 drives the integral linkage mechanism LM and the chain guide member 10 connected thereto to move, so that the chain can move between different sized sprockets in the rear freewheel.

[0026] In some embodiments, the bicycle rear derailleur 1 may further include a test element 16, a primary transmission gear 17, and a secondary transmission gear 18. The primary transmission gear 17 is fixed to the output shaft 12, the secondary transmission gear 18 is connected to the primary transmission gear 17, and the test element 16 is disposed on the secondary transmission gear 18. In this configuration, the test element 16 is disposed on a path other than the path of the motor 11 driving through the output shaft 12. That is, the gear on which the test element 16 is disposed (i.e., the secondary transmission gear 18) is not a gear on the path of the motor 11 driving through the output shaft 12.

[0027] In some embodiments, the control circuit board 15 may further include a sensing unit 154, which is disposed on the substrate 151 and corresponds to the element under test 16. In some embodiments, the element under test 16 is, for example, a magnet, and the sensing unit 154 is, for example, a Hall sensor. Thus, the sensing unit 154 can sense the rotational position of the secondary transmission gear 18 disposed thereon through the element under test 16, thereby determining the current gear position of the bicycle's rear derailleur 1.

[0028] Next, please refer to Figures 5 to 7. Figure 7 is a top view of the first transmission gear 17, the second transmission gear 18, and the toothed belt 19 in Figure 5.

[0029] In some embodiments, the bicycle rear derailleur 1 may further include a toothed belt 19. A second drive gear 18 is separated from a first drive gear 17, and the toothed belt 19 is fitted over both the second drive gear 18 and the first drive gear 17, thereby connecting the second drive gear 18 to the first drive gear 17 via the toothed belt 19. This reduces backlash.

[0030] In the above embodiments, by setting the battery assembly 9 on one of the first pivot 4, the second pivot 5, the third pivot 6 and the fourth pivot 7 (such as the first pivot 4 and the second pivot 5), and by configuring the battery assembly 9 separately from the base member 2, the movable member 3 and the linkage assembly 8, the battery assembly 9 can be set with a simple mechanism design, and the aesthetics of the bicycle can be avoided as much as possible, and the movement of the linkage mechanism LM will not be affected.

[0031] It should be noted that the motor 11, main drive gear 14, output shaft 12, linkage mechanism 13, control circuit board 15, first drive gear 17, second drive gear 18, tested element 16 and toothed belt 19 mentioned above are optional components, and may be omitted in other embodiments.

[0032] Next, please refer to Figures 8 through 10. Figure 8 is a perspective view of the bicycle rear derailleur 1a disclosed in the second embodiment of the present invention. Figure 9 is a perspective view of the bicycle rear derailleur 1a of Figure 8 from another angle. Figure 10 is a partial cross-sectional view of the bicycle rear derailleur 1a of Figure 8.

[0033] The bicycle rear derailleur 1a is similar to the bicycle rear derailleur 1 in the above embodiment. The following mainly describes the differences between the two. For the similarities, please refer to the preceding paragraphs, and will not be repeated here.

[0034] In some embodiments, the battery assembly 9a of the bicycle rear derailleur 1a may be movably disposed on the linkage mechanism LMa and may be movable relative to the base member 2a, the movable member 3a and the linkage assembly 8a.

[0035] In some embodiments, the linkage mechanism 13a of the bicycle rear derailleur 1a includes a first linkage 131a and a second linkage 132a. The first linkage 131a is connected to the inner link 82a of the output shaft 12a and the linkage assembly 8a, and the second linkage 132a is connected to the output shaft 12a and the battery assembly 9a.

[0036] In some embodiments, the linkage mechanism 13a of the bicycle rear derailleur 1a may further include a pivot arm 133a. One end of the pivot arm 133a is fixed to the output shaft 12a, the two opposite ends of the first linkage member 131a are respectively pivotally connected to the pivot arm 133a and the inner connecting rod 82a of the linkage assembly 8a, and the two opposite ends of the second linkage member 132a are respectively pivotally connected to the pivot arm 133a and the battery assembly 9a.

[0037] In some embodiments, the second linkage 132a may include a first swing arm 1321a and a second swing arm 1322a. The two opposite ends of the first swing arm 1321a are pivotally connected to the rotating arm 133a and the second swing arm 1322a, respectively, and the end of the second swing arm 1322a away from the first swing arm 1321a is pivotally connected to the battery assembly 9a.

[0038] In some embodiments, the bicycle rear derailleur 1a may further include a first connector 20a and a second connector 21a. The two opposite ends of the first connector 20a are respectively fixed to a first pivot 4a and a second pivot 5a. The two opposite ends of the second connector 21a are respectively pivotally connected to the battery assembly 9a and the first connector 20a.

[0039] In some embodiments, one end of the second connector 21a is pivotally connected to one end of the first connector 20a adjacent to the second pivot 5a, and the pivot axis R of the second connector 21a relative to the first connector 20a is separated from the central axis C of the second pivot 5a.

[0040] During the operation of the motor (motor 11 as shown in Figure 5) of the bicycle rear derailleur 1a, the power output by the motor is transmitted to the swing arm 133a via the output shaft 12a, causing the swing arm 133a to rotate. In this way, in addition to driving the overall linkage mechanism LMa (composed of inner link 82a, outer link 81a, base member 2a and movable member 3a) and the chain guide member 10a connected thereto via the first linkage 131a and inner link 82a, the swing arm 133a also drives the battery assembly 9a by pushing the second swing arm 1322a via the first swing arm 1321a of the second linkage 132a. This causes the battery assembly 9a to move relative to the base member 2a, movable member 3a and linkage assembly 8a, thus avoiding interference between the battery assembly 9a and the linkage mechanism LMa during the movement of the linkage mechanism LMa.

[0041] In the above embodiments, the motor is disposed within the base member, but this is not a limitation. In other embodiments, the motor may be disposed on one of the components of the linkage mechanism.

[0042] Next, please refer to Figures 11 and 12. Figure 11 is a perspective view of the bicycle rear derailleur 1b disclosed in the third embodiment of the present invention. Figure 12 is a perspective view of the bicycle rear derailleur 1b of Figure 11 from another perspective.

[0043] The bicycle rear derailleur 1b is similar to the bicycle rear derailleur 1 in the above embodiment. The following mainly describes the differences between the two. For the similarities, please refer to the preceding paragraphs, and will not be repeated here.

[0044] In some embodiments, the base member 2b, the movable member 3b, and the linkage assembly 8b of the bicycle rear derailleur 1b collectively define an internal space Sb, while the battery assembly 9b is located entirely outside the internal space Sb and is fixed to the first pivot 4b and the second pivot 5b.

[0045] According to the bicycle rear derailleur disclosed in the above embodiments, by configuring the battery assembly on one of the first pivot, second pivot, third pivot, and fourth pivot, and separating the battery assembly from the base member, moving member, and linkage assembly, the battery assembly can be configured with a simple mechanism design, minimizing impact on the aesthetics of the bicycle's appearance, and without affecting the movement of the linkage assembly.

[0046] Furthermore, by connecting the first linker of the linkage mechanism to the output shaft and the linkage assembly, and the second linker to the output shaft and the battery assembly, the power output by the motor can drive the linkage mechanism and the battery assembly.

[0047] Furthermore, by movably mounting the battery assembly of the bicycle's rear derailleur onto the linkage mechanism, and by allowing it to move relative to the base member, movable member, and linkage assembly, interference between the battery assembly and the linkage mechanism can be avoided during the movement of the linkage mechanism.

[0048] Although the present invention has been disclosed above with reference to the preferred embodiments described above, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be determined by the claims defined in the appended patent application.

[0049] 1, 1a, 1b: Rear derailleur of a bicycle 2,2a,2b: Base components 3, 3a, 3b: Movable components 4, 4a, 4b: First pivot 5, 5a, 5b: Second pivot 6: Third Pivot 7: Fourth Pivot 8, 8a, 8b: Linkage assembly 81: External Link 811: Arm 812: Connecting part 82, 82a: Inner connecting rod 821: Pole section 9, 9a, 9b: Battery Components 91: Battery Case 92: Battery 10: Guide chain components 11: Motor 12, 12a: Output shaft 13,13a: Linkage mechanism 131a: First Linkage Component 132a: Second linkage 1321a: First swing arm 1322a: Second swing arm 133a: Rotary arm 14: Main drive gear 15: Control circuit board 151:Substrate 152: Control Unit 153: Wireless Communication Unit 154: Sensing Unit 16: Component under test 17: First transmission gear 18: Second transmission gear 19: Toothed belt 20a: First connector 21a: Second connector F: Chassis M: Installation axis C1, C2, C3, C4, C: Central axis P, P1, P2, P3, P4: Plane θ: acute angle LM, LMa: Linkage mechanism S, Sb: Internal space R: Pivot axis

Claims

1. A bicycle rear derailleur, comprising: a base member for mounting on a frame; a movable member; a first pivot, a second pivot, a third pivot, and a fourth pivot; a linkage assembly, one side of which is pivotally connected to the base member via the first pivot and the second pivot, and the other side of which is pivotally connected to the movable member via the third pivot and the fourth pivot; a battery assembly disposed on one of the first pivot, the second pivot, the third pivot, and the fourth pivot, and the battery assembly being separate from the base member, the movable member, and the linkage assembly; and a chain guide member pivotally connected to the movable member.

2. The bicycle rear derailleur as claimed in claim 1, wherein the base member is used to mount the bicycle frame along a mounting axis; a plane is defined perpendicular to the central axes of the first pivot, the second pivot, the third pivot, and the fourth pivot, the mounting axis forming an acute angle with the plane.

3. The bicycle rear derailleur as described in claim 2, wherein the acute angle is 15 degrees.

4. The bicycle rear derailleur as claimed in claim 1, wherein the linkage assembly includes an outer link and an inner link, one end of the outer link and one end of the inner link are pivotally connected to the base member via the first pivot and the second pivot, and the other end of the outer link and the other end of the inner link are pivotally connected to the movable member via the third pivot and the fourth pivot, the base member, the movable member and the linkage assembly together defining an interior space, and the battery assembly being at least partially located within the interior space.

5. The bicycle rear derailleur as claimed in claim 1, wherein the linkage assembly includes an outer link and an inner link, one end of the outer link and one end of the inner link are pivotally connected to the base member via the first pivot and the second pivot, and the other end of the outer link and the other end of the inner link are pivotally connected to the movable member via the third pivot and the fourth pivot, the base member, the movable member and the linkage assembly together defining an interior space, and the battery assembly being located entirely outside the interior space.

6. The bicycle rear derailleur as claimed in claim 1, wherein the battery assembly is fixed to the first pivot and the second pivot.

7. The bicycle rear derailleur as claimed in claim 1 further includes a motor, an output shaft and a linkage mechanism, the motor being disposed within the base member and electrically connected to the battery assembly, the output shaft being connected to the motor, and the linkage mechanism being located outside the base member and connected to the output shaft and the linkage assembly.

8. The bicycle rear derailleur as described in claim 7 further includes a control circuit board disposed within the base member and electrically connected to the battery assembly and the motor. The control circuit board includes a substrate, a control unit, and a wireless communication unit disposed on the substrate.

9. The bicycle rear derailleur as claimed in claim 8 further includes a plurality of main drive gears disposed within the base member, and the motor is connected to the output shaft via the main drive gears.

10. The bicycle rear derailleur as claimed in claim 9 further includes a test element, a primary transmission gear and a secondary transmission gear, the primary transmission gear being fixed to the output shaft, the secondary transmission gear being connected to the primary transmission gear, the test element being disposed on the secondary transmission gear, and the control circuit board further including a sensing unit disposed on the substrate and corresponding to the test element.

11. The bicycle rear derailleur as claimed in claim 10 further includes a toothed belt, wherein the second drive gear is separated from the first drive gear, and the toothed belt is fitted over the second drive gear and the first drive gear such that the second drive gear is connected to the first drive gear via the toothed belt.

12. The bicycle rear derailleur as claimed in claim 7, wherein the linkage mechanism includes a first linkage and a second linkage, the first linkage being connected to the output shaft and the linkage assembly, and the second linkage being connected to the output shaft and the battery assembly.

13. The bicycle rear derailleur as claimed in claim 12, wherein the linkage further includes a swing arm, one end of which is fixed to the output shaft, the opposite ends of the first linkage are pivotally connected to the swing arm and the linkage assembly, and the opposite ends of the second linkage are pivotally connected to the swing arm and the battery assembly, respectively.

14. The bicycle rear derailleur as claimed in claim 13, wherein the second linkage includes a first swing arm and a second swing arm, the opposite ends of the first swing arm being pivotally connected to the swing arm and the second swing arm, respectively, and the end of the second swing arm away from the first swing arm being pivotally connected to the battery assembly.

15. The bicycle rear derailleur as claimed in claim 13 further includes a first connector and a second connector, the opposite ends of the first connector being fixed to the first pivot and the second pivot, respectively, and the opposite ends of the second connector being pivotally connected to the battery assembly and the first connector, respectively.

16. The bicycle rear derailleur as claimed in claim 15, wherein the linkage assembly includes an outer link and an inner link, one end of the outer link and one end of the inner link being pivotally connected to the base member via the first pivot and the second pivot, the other end of the outer link and the other end of the inner link being pivotally connected to the movable member via the third pivot and the fourth pivot, one end of the first connecting member being pivotally connected to the inner link, one end of the second connecting member being pivotally connected to one end of the first connecting member adjacent to the second pivot, and the pivot axis of the second connecting member relative to the first connecting member being separated from the central axis of the second pivot.

17. A bicycle rear derailleur, comprising: a base member; a movable member; a linkage assembly, one side of which is pivotally connected to the base member and the other side of which is pivotally connected to the movable member, such that the base member, the movable member, and the linkage assembly together constitute a linkage mechanism; a battery assembly disposed on one pivot of the linkage mechanism and separate from the base member, the movable member, and the linkage assembly; a motor disposed on the linkage mechanism and electrically connected to the battery assembly; an output shaft connected to the motor; a linkage mechanism including a first linkage member and a second linkage member, the first linkage member being connected to the output shaft and the linkage assembly, and the second linkage member being connected to the output shaft and the battery assembly; and a chain guide member pivotally connected to the movable member.

18. A bicycle rear derailleur, comprising: a base member; a movable member; a linkage assembly, one side of which is pivotally connected to the base member and the other side of which is pivotally connected to the movable member, such that the base member, the movable member, and the linkage assembly together constitute a linkage mechanism; a battery assembly movably disposed on one of the pivots of the linkage mechanism and movable relative to the base member, the movable member, and the linkage assembly, and wherein the battery assembly is separable from the base member, the movable member, and the linkage assembly; a motor disposed on the linkage mechanism and electrically connected to the battery assembly, and the motor being used to drive the linkage assembly and the battery assembly; and a chain guide member pivotally connected to the movable member.

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