CN211364839U - bicycle rear derailleur - Google Patents

Abstract

A rear derailleur of a bicycle comprises a fixed part, a connecting rod component, a moving part and a driving component, wherein the fixed part is connected with a frame; the connecting rod component is pivoted to the fixing part; the moving part is pivoted to the connecting rod assembly; the chain shifting arm is connected with the moving part; the driving assembly comprises a motor and a transmission gear set, the motor comprises an output shaft to drive the transmission gear set, the transmission gear set is coupled with the connecting rod assembly, and the output shaft of the motor drives the connecting rod assembly to swing in a pivot mode through the transmission gear set so as to drive the moving part and the chain shifting arm to move; the movable part is provided with a pivot shaft and a detachable battery module, the chain shifting arm is pivoted on the pivot shaft, and the battery module provides power for the motor. Thus, the wiring of the power supply line can be simplified.

Description

bicycle rear derailleur

technical field

The utility model is related to the derailleur of a bicycle; in particular, it refers to a rear derailleur of a bicycle.

Background technique

With the popularity of bicycle leisure activities, bicycles have become a tool for leisure sports from an early means of transportation. In order to improve and increase the performance of bicycles, the manufacturing technology of bicycles has been continuously improved. Among them, the transmission is one of the main reasons for affecting the riding speed. Take the rear derailleur as an example. The rear derailleur includes a moving frame and a derailleur arm. The moving frame is connected to the frame and adopts a parallel four-link mechanism. The derailleur arm is connected to the moving frame, and the derailleur arm is driven by the moving moving frame. , and then change the relative position of the chain and the sprocket to achieve the purpose of changing gears, so that the rider can change gears according to the road conditions and increase the riding speed.

The traditional rear derailleur uses a cable to pull the moving frame, which drives the derailleur arm. In recent years, electronic rear derailleurs have appeared on the market, which are driven by a motor, and use a gear set to transmit the power of the motor to an output shaft, so that the output shaft rotates to drive the moving frame to move. The electronic rear derailleur has the advantage of improving the efficiency of shifting, making shifting more quickly and conveniently. However, there are still the following disadvantages:

1. The moving frame of the electronic rear derailleur is located on the outside of the frame. When the moving frame is hit by an external force, the gear set or the output shaft of the motor may be damaged due to the excessive moving force of the moving frame, and the gear cannot be changed.

2. The installation position of the motor and gear set of the electronic rear derailleur is outside the moving frame, which will make the overall volume of the rear derailleur too large.

3. Since the electronic rear derailleur is powered by a motor, the motor needs to be powered by an external battery. At present, the battery is arranged on the frame, for example, near the seat tube, and is then connected to the motor of the rear derailleur by a power cable to provide motor power. There is still some distance from the position of the battery to the position of the rear derailleur, therefore, the wiring of the power cable will cause inconvenience in assembly.

4. In order to achieve the purpose of reusability of the battery, the above-mentioned batteries are also designed with rechargeable batteries, and a charging interface will be set on the rechargeable batteries. Plug the external power supply with the charging cable into the charging port to charge the rechargeable battery. Since the bicycle is used outdoors, sand and moisture may enter the charging interface, resulting in poor contact or damage to the charging interface.

Therefore, the design of the existing electronic rear derailleur is still not perfect and needs to be improved.

In addition, whether it is an electronic rear derailleur or a traditional rear derailleur pulled by a wire, the moving frame is provided with a pivot shaft (or called p-knuckle) to connect the derailleur arm, and a torsion spring is arranged on the pivot shaft. The spring provides torque to the pivot shaft, so that the derailleur arm can provide a certain tension to the chain, so that the chain and the sprocket can be engaged during normal riding or shifting. However, when the rider encounters poor road conditions, such as uneven road surface, the derailleur arm may shake or vibrate excessively, which affects the engagement between the chain and the sprocket or causes the chain to drop; or when the derailleur arm Pulled by external force, after the external force is released, the torsion force of the torsion spring drives the derailleur arm to rebound quickly, which will also cause the derailleur arm to shake or vibrate excessively, which will affect the engagement between the chain and the sprocket or cause the chain to drop.

Therefore, the design of the pivot shaft of the rear derailleur still needs to be improved.

Utility model content

In view of this, the purpose of the present invention is to provide a rear derailleur of a bicycle, which can effectively improve the above deficiencies.

In order to achieve the above purpose, the utility model provides a rear derailleur of a bicycle, comprising a fixed part, a connecting rod assembly, a moving part, a clutch assembly and a driving assembly, wherein the fixed part is connected to a bicycle The connecting rod assembly is pivotally connected to the fixed part; the moving part is pivotally connected to the connecting rod assembly; the derailleur arm is connected to the moving part; the driving assembly includes a motor, a transmission A gear set and a clutch assembly, the motor includes an output shaft to drive the transmission gear set, the transmission gear set is coupled to the clutch assembly, so that the output shaft of the motor passes through the transmission gear set and The clutch assembly drives the link assembly to pivot, thereby driving the moving part and the derailleur arm to move; the clutch assembly is pivoted between the fixed part and the link assembly, and the clutch assembly is pivoted between the fixed part and the link assembly. The assembly includes a first clutch piece and a second clutch piece that are abutted along a shaft, the first clutch piece is provided with a plurality of first clutch teeth extending toward the direction of the second clutch piece, the second clutch piece The clutch member is provided with a plurality of second clutch teeth extending toward the direction of the first clutch member, and the plurality of second clutch teeth are engaged with the plurality of first clutch teeth; when the first clutch member and the When the relative rotational torque between the second clutch members is greater than a predetermined resistance, slippage occurs between the plurality of first clutch teeth and the plurality of second clutch teeth.

Thereby, the clutch assembly can generate a clutch when the connecting rod assembly is impacted by an external force, so as to avoid damage to the transmission gear set or the output shaft of the motor. In addition, when the moving part is blocked, the clutch assembly can also generate a clutch to prevent the motor from overheating.

The utility model provides a rear derailleur of a bicycle, comprising a fixed part, a connecting rod assembly, a moving part, a derailleur arm and a driving assembly, wherein the fixed part is arranged on a frame, the fixed part is The part has a first pivot part and a second pivot part; the link assembly includes a first link and a second link, one end of the first link is pivoted through a first pivot In the first pivoting portion, one end of the second link is pivotally connected to the second pivoting portion via a second pivot; the moving portion has a third pivoting portion and a fourth pivoting a connecting portion, the third pivoting portion is pivotally connected to the first link via a third pivot, the fourth pivoting portion is pivotally connected to the second link via a fourth pivot; The derailleur arm is connected to the moving part; the drive assembly is arranged on one of the first link and the second link, and the drive assembly includes a motor and a transmission gear set, so The output shaft of the motor is connected to the transmission gear set, and the transmission gear set drives one of the first pivot, the second pivot, the third pivot and the fourth pivot to drive the link assembly to pivot swing, thereby driving the moving part and the derailleur arm to move.

By arranging the drive assembly on the connecting rod assembly, the overall volume of the rear derailleur can be reduced, and the disadvantage of the traditional electronic rear derailleur being oversized can be improved.

The utility model provides a bicycle rear derailleur, comprising a fixed part, a connecting rod assembly, a moving part, a derailleur arm and a driving assembly, wherein the fixed part is connected to a frame; The rod assembly is pivotally connected to the fixed part; the moving part is pivoted to the link assembly; the derailleur arm is connected to the moving part; the driving assembly includes a motor and a transmission gear set, the The motor includes an output shaft to drive the transmission gear set, the transmission gear set is coupled to the connecting rod assembly, the output shaft of the motor drives the connecting rod assembly to pivot through the transmission gear set, and then Drive the moving part and the derailleur arm to move; wherein, the moving part is provided with a pivot shaft and a detachable battery module, the derailleur arm is pivotally connected to the pivot shaft, and the battery module provides power to the motor.

By arranging the battery module on the moving part of the rear derailleur, the distance of power supply is short, the power cable does not need to be pulled from the frame to the rear derailleur, and the wiring of the power cable is simplified.

The utility model provides a bicycle rear derailleur, comprising a fixed part, a connecting rod assembly, a moving part, a derailleur arm, a driving assembly, a rechargeable battery, a coil and a wireless charging circuit, wherein the the fixed part is connected to a frame; the link assembly is pivoted to the fixed part; the moving part is pivoted to the link assembly; the derailleur arm is connected to the moving part; the drive The assembly includes a motor and a transmission gear set, the motor includes an output shaft to drive the transmission gear set, the transmission gear set is coupled to the connecting rod assembly, and the output shaft of the motor passes through the transmission The gear set drives the link assembly to pivot, and then drives the moving part and the derailleur arm to move; the rechargeable battery provides power to the motor; the coil receives external charging energy, and the coil is arranged one of the fixed part, the moving part and the connecting rod assembly; the wireless charging circuit is electrically connected to the coil and the rechargeable battery, and the wireless charging circuit receives the electric energy of the coil as the the rechargeable battery described above.

By arranging the wireless charging coil on the components of the rear derailleur, the charging of the rechargeable battery of the rear derailleur is more convenient, and there is no need to set a charging interface on the battery module.

The utility model provides a bicycle rear derailleur, comprising a fixed part, a connecting rod assembly, a moving part, a derailleur arm and a driving assembly, wherein the fixed part is connected to a frame; the rod assembly is pivoted to the fixed part; the moving part is pivoted to the link assembly; the derailleur arm is connected to the moving part; the drive assembly is coupled to the link assembly and drives the link assembly The link assembly pivots, thereby driving the moving part and the derailleur arm to move; wherein, the moving part includes a cover, a pivot shaft and a damping member, wherein the cover has an accommodating space ; the pivot shaft is arranged in the accommodating space and is connected to the derailleur arm; the damping member is sleeved on the pivot shaft, and the damping member is arranged in the pivot shaft and the accommodating space There is an outer abutting surface between the inner walls, and the outer abutting surface abuts against the inner wall of the accommodating space.

The damping element can produce a damping effect to slow down the swinging speed of the derailleur arm, avoid excessive shaking or vibration of the derailleur arm, cause the chain to jump, and affect the engagement between the chain and the sprocket or cause the chain to drop.

Description of drawings

FIG. 1 is a perspective view of a rear derailleur of a bicycle according to a preferred embodiment of the present invention.

FIG. 2 is a partial exploded perspective view of the rear derailleur according to the above preferred embodiment of the present invention.

FIG. 3 is a partial exploded perspective view of the rear derailleur according to the above preferred embodiment of the present invention.

FIG. 4 is the rear derailleur of the above-mentioned preferred embodiment of the present invention.

FIG. 5 is a top view of the rear derailleur according to the above preferred embodiment of the present invention.

FIG. 6 is a schematic view showing a part of the connecting rod assembly of the rear derailleur.

FIG. 7 is a cross-sectional view taken along the line 7-7 of FIG. 5 .

FIG. 8 is a partial enlarged view of FIG. 7

FIG. 9 is a perspective view of the motor, the transmission gear and the first pivot according to the above preferred embodiment.

FIG. 10 is an exploded perspective view of the first pivot of the above preferred embodiment.

FIG. 11 is a partially exploded perspective view of the first pivot of the above preferred embodiment.

FIG. 12 is a partial side view of the moving part of the above preferred embodiment.

FIG. 13 is a partially exploded perspective view of the rear derailleur of the above preferred embodiment.

FIG. 14 is a cross-sectional view taken along the line 14-14 of FIG. 12 .

FIG. 15 is a partially exploded perspective view of the rear derailleur of the above preferred embodiment.

FIG. 16 is a partially exploded perspective view of the rear derailleur of the above preferred embodiment.

FIG. 17 is a partially exploded perspective view of the rear derailleur of the above preferred embodiment.

FIG. 18 is a partial side view of the moving part of the above-described preferred embodiment.

FIG. 19 is a partial cross-sectional view taken in the direction 19-19 of FIG. 18. FIG.

FIG. 20 is a partial perspective view of the rear derailleur of the above preferred embodiment.

21 is a partially exploded perspective view of a rear derailleur according to another preferred embodiment of the present invention.

Fig. 22 is a partial side view of the rear derailleur of another preferred embodiment of the present invention.

FIG. 23 is a side view of the rear derailleur of another preferred embodiment of the present invention.

FIG. 24 is a side view of the rear derailleur of another preferred embodiment of the present invention.

FIG. 25 is a top view of a rear derailleur according to another preferred embodiment of the present invention.

FIG. 26 is a side view of the rear derailleur of another preferred embodiment of the present invention.

FIG. 27 is a side view of the rear derailleur of another preferred embodiment of the present invention.

FIG. 28 is a side view of the rear derailleur of another preferred embodiment of the present invention.

Description of reference numerals

[the utility model]

100 rear derailleur

10 Fixed part

11 Connector 12 Body 12a Cover

122 first pivot portion 122a first pivot end 122b second pivot end

122c counterbore 122d perforated 122e pin hole

124 The second pivot part 124a The pivot end 14 The first seat

16 Second seat body 17 Fixing parts

20 connecting rod assembly

22 Ends of the first link 22a, 22b

24 The end of the second link 24a, 24b 241 The pivot end

26 Motor bracket 26a Half shell 26b Perforated

Room 262, 264

28 Shell 281a Top 281b Bottom

281c Receptacle 282 Cover 284 Extension Plate

286 threading holes

30 Mobile Ministry

31 The third pivot part 32 The fourth pivot part

33 housing 330 housing

33a outer side 33b inner side

331 The first accommodating space 331a The first accommodating chamber 331b The second accommodating chamber

331c Partition plate 331d Perforated 332 First outer cover

332a extension 332b perforation 333 mounting hole

334 Second accommodating space 335 Second outer cover 335a Space

336 Opening 337 Threading hole

40 derailleur arm

42 Arm 44 Guide Wheel

50 drive components

511 first pivot 511a first end

511b Shaft 511c Extension 511d Threaded Segment

512 Second pivot 513 Third pivot 514 Fourth pivot

514a pivot shaft

52 motor 521 output shaft

54 transmission gear set

541 First gear 542 Second gear 543 Worm

55 clutch assembly

551 first clutch 551a gear teeth

551b First clutch tooth 551c Force-receiving part 551d Ring groove

552 second clutch

552a second clutch tooth 552b screw hole 552c end

552d pin hole 552e tap hole 553 elastic piece

56 drive circuit board 57 magnet 58 magnetic sensor

60 Turning Components

61 pivot shaft 611 first part 612 second part

612a Flange 613 Driven swivel hole

62 elastic parts 63 bearings 64 damping parts

641a Outer abutment surface 641b Inner abutment surface

80 battery modules

81 battery box 81a box body 81b box cover

81c through hole

82 battery 83 power cord

84 coil 842 receiving surface

85 wireless charging circuit

D1, D2 rotation direction

L spacing

T thickness

Detailed ways

In order to illustrate the present invention more clearly, preferred embodiments are given and described in detail with the accompanying drawings as follows. Referring to FIGS. 1 to 20 , a rear derailleur 100 of a bicycle according to a preferred embodiment of the present invention includes a fixed part 10 , a connecting rod assembly 20 , a moving part 30 , a derailleur arm 40 and a driving assembly 50, of which:

The fixing part 10 is used for connecting to the frame of the bicycle (not shown), and is located at the outer side of the rear chain plate set of the bicycle. One end of the link assembly 20 is pivotally connected to the fixed portion 10 , and the movable portion 30 is pivotally connected to an end of the link assembly 20 opposite to the fixed portion 10 . The derailleur arm 40 is connected to the moving part 30 . The derailleur arm 40 includes an arm frame 42 and two guide wheels 44 .

The fixing part 10 includes a connecting piece 11 and a base body 12 , one end of the connecting piece 11 is pivotally connected with the base body 12 , and the other end of the connecting piece 11 is fixed to the frame. The base body 12 is provided with a first pivot portion 122 and a second pivot portion 124 . The first pivot portion 122 and the second pivot portion 124 are respectively pivoted to the link assembly 20 . In this embodiment, the first pivot portion 122 is provided with two corresponding first pivot ends 122a, 122b, and the second pivot portion 124 is provided with two corresponding second pivot ends 124a. The second pivot portion 124 is located between the first pivot portion 122 and the derailleur arm 40 , and the first pivot portion 122 is closer to the outer side of the fixing portion 10 . In other embodiments, the first pivot portion 122 may be located between the second pivot portion 124 and the derailleur arm 40 , and the second pivot portion 124 is closer to the outer side of the fixing portion 10 .

More specifically, the base body 12 includes a first base body 14 and a second base body 16 . The second base body 16 is detachably connected to the bottom of the first base body 14 . In this embodiment, a first pivot end 122a of the first pivot portion 122 and two second pivot ends 124a of the second pivot portion 124 are disposed on the first seat body 14, and the first pivot portion 122 The other pivot end 122b is disposed on the second base body 16 .

The moving portion 30 is provided with a third pivot portion 31 and a fourth pivot portion 32 . The third pivot portion 31 and the fourth pivot portion 32 are respectively pivoted to the link assembly 20 . In this embodiment, the fourth pivot portion 32 is located between the third pivot portion 31 and the derailleur arm 40 . In other embodiments, the third pivot portion 31 may be located between the fourth pivot portion 32 and the derailleur arm 40, and the fourth pivot portion 32 is closer to the outer side of the fixing portion 10.

The link assembly 20 includes a first link 22 and a second link 24 , and the second link 24 is located between the first link 22 and the derailleur arm 40 . One end portion 22 a of the first link 22 is pivotally connected to the first pivot portion 122 of the fixing portion 10 via a first pivot shaft 511 , so that the end portion 22 a of the first link 22 is disposed on both sides of the first pivot portion 122 . Between the pivot ends 122 a and 122 b , in other words, the first pivot shaft 511 is disposed between the fixing portion 10 and the link assembly 20 . The other end portion 22 b of the first link 22 is pivotally connected to the third pivot portion 31 of the moving portion 30 via a third pivot shaft 513 .

Please refer to FIG. 4 , one end portion 24a of the second link 24 is pivotally connected to the second pivot portion 124 of the fixing portion 10 via a second pivot shaft 512, so that the end portion 24a of the second link 24 is disposed on the second pivot between the two pivot ends 124a of the connecting portion 124 . The other end 24b of the second link 24 extends toward the moving part 30 to form two opposite pivot ends 241 , so that the second link 24 is substantially Y-shaped, and the two pivot ends 241 are pivoted through a fourth pivot 514 Connected to the fourth pivot portion 32 of the moving portion 30 , the fourth pivot shaft 514 in this embodiment is two independent pivot shafts 514 a disposed on the same pivot axis.

Please refer to FIG. 6 to FIG. 9 together, the drive assembly 50 includes a motor 52 , a transmission gear set 54 and a drive circuit board 56 , the output shaft 521 of the motor 52 is connected to the transmission gear set 54 , and the transmission gear set 54 is coupled to the connecting rod In the assembly 20, the driving circuit board 56 is electrically connected to the motor 52, and the driving circuit board 56 is used for receiving wired or wireless shift control signals, and controls the motor 52 according to the shift control signals. When the output shaft of the motor 52 rotates, it is transmitted through the transmission gear set 54 to drive the link assembly 20 to pivot, thereby driving the moving part 30 and the derailleur arm 40 to move, so as to achieve the purpose of shifting gears.

The drive assembly 50 may be disposed on the first link 22 of the link assembly 20, and the transmission gear set 54 is coupled to one of the first pivot shaft 511 and the third pivot shaft 513, and imparts rotational force to the first pivot shaft 511 and the third pivot shaft 513. The pivot shaft 511 or the third pivot shaft 513 drives the first link 22 where the drive assembly 50 is located to deflect, so that the link assembly 20 pivots. In addition, the drive assembly 50 can be disposed on the second link 24 of the link assembly 20, and the transmission gear set 54 is coupled to one of the second pivot 512 and the fourth pivot 514, and imparts a rotational force to The second pivot shaft 512 or the fourth pivot shaft 514 drives the second link 24 where the drive assembly 50 is located to deflect, so that the link assembly 20 pivots.

The driving component 50 of this embodiment is set on the first link 22 as an example, and the driving component 50 is coupled to the first pivot shaft 511 . In this embodiment, the first link 22 includes a motor bracket 26 and a housing 28 . The housing 28 is coupled to the motor bracket 26 , one end of the motor bracket 26 is pivotally connected to the first pivot portion 122 of the fixed portion 10 via a first pivot shaft 511 , and the other end of the motor bracket 26 is pivotally connected to the moving portion via a third pivot shaft 513 . The third pivot part 31 of 30 . The motor 52 and the transmission gear set 54 are arranged in the motor bracket 26 . The motor bracket 26 is formed by combining two half-shells 26 a . There are two chambers 262 and 264 inside the motor bracket 26 , the motor 52 and the transmission gear set 54 . They are respectively arranged in the two chambers 262 and 264 . In practice, the motor bracket 26 may be provided with a chamber in which the motor 52 and the transmission gear set 54 are located. In practice, the motor bracket 26 can be integrally formed with the first link 22 where it is located; if the motor bracket 26 is located on the second link 22, the motor bracket 26 can be integrally formed with the second link 24.

The first pivoting end 122a of the first pivoting portion 122 of the fixing portion 10 is provided with a counterbore 122c, the second pivoting end 122b is provided with a through hole 122d, and the countersunk hole 122c is correspondingly provided with the through hole 122d. In addition, the second pivot end 122b of the fixing portion 10 is provided with a pin hole 122e intersecting with the through hole 122d, and one end of the first pivot 511 is provided with a pin hole 552d corresponding to the pin hole 122e. One end of the motor bracket 26 is provided with two through holes 26b corresponding to the counterbore 122c and the through hole 122d. After the first pivot shaft 511 passes through the through hole 122d of the fixing portion 10 and the two through holes 26b of the motor bracket 26, a fixing member 17 passes through the pin holes 122e, 552d to fix the relative positions of the two pin holes 122e, 552d . The fixing member 17 can be a latch. At least one end of the first pivot shaft 511 is fixed with the first pivot portion 122 of the fixing portion 10 so that the first pivot shaft 511 cannot rotate relative to the fixing portion 10 . For example, one end of the first pivot shaft 511 is fixed to the counterbore 122c , and the other end is set in the through hole 122d. In practice, the second pivot shaft 512 , the third pivot shaft 513 or the fourth pivot shaft 514 coupled with the transmission gear set may be provided with a pin hole, which is connected to the second pivot shaft 512 , the third pivot shaft 513 or the fourth pivot shaft The second pivot portion 124 , the third pivot portion 31 or the fourth pivot portion 32 connected by 514 may be provided with a corresponding pin hole, and the relative positions of the two pin holes are fixed by the fixing member 17 .

The transmission gear set 54 includes a first gear 541 , a second gear 542 and a worm 543 . The first gear 541 is sleeved on the output shaft 521 of the motor 52 , and the first gear 541 is meshed with the second gear 542 . The clutch assembly 55 is disposed on the first pivot shaft 511 to drive the motor bracket 26 to rotate relative to the first pivot shaft 511, so as to pivot the link assembly 20 and drive the derailleur arm 40 to move, so that the chain can be connected with chains of different radii. The wheel meshes, in other words, a portion of the first link 22 is provided with the clutch assembly 55 . In other embodiments, the clutch assembly can also be disposed on the third pivot shaft 513 or the fourth pivot shaft 514 , and the first link 22 or the second link 24 provided with the driving assembly 50 is connected to the fixing portion 10 via the clutch assembly 55 . Or the pivoting end of the moving part 30 is pivotally connected.

The driving assembly 50 includes a magnet 57 and a magnetic sensor 58 . The magnet 57 is disposed in the counterbore 122c of the first pivoting portion 122 of the fixing portion 10, and is located at the first end 511a of the first pivot 511, and the first end 511a is far away from the fixing member 17. In practice, the magnet 57 can also be combined with The first end 511a. The magnetic sensor 58 is disposed on the first link 22 corresponding to the magnet 57 and is adjacent to but not in contact with the magnet 57. One side of the magnet 57 faces the magnetic sensor 58, and the other side of the magnet 57 faces the first link 511. In this embodiment, The magnetic sensor 58 is disposed in the direction opposite to the first pivot shaft 511 of the magnet 57 . The magnetic sensor 58 is electrically connected to the driving circuit board 56 , and the magnetic sensor 58 detects the relative position of the first pivot shaft 511 provided with the driving component 50 and the magnet 57 . , and provide a position signal to the driving circuit board 56 for feedback control. Magnetic sensor 58 may be a Hall sensor. In practice, if the drive assembly 50 is arranged on the second link 24 , the magnetic sensor 58 can be arranged on the second link 24 provided with the motor bracket 26 . The magnet 56 can also be disposed at the end of one end of one of the second pivot, the third pivot and the fourth pivot of the clutch assembly 55 , preferably away from the fixing member 17 .

Please refer to FIG. 9 and FIG. 10 , the output shaft 521 of the motor 52 is connected to the transmission gear set 54 , the transmission gear set 54 is engaged with the clutch assembly 55 , and the clutch assembly 55 is disposed on the first pivot shaft 511 . When the output shaft 521 of the motor 52 rotates, the motor 52 applies rotational force to the clutch assembly 55 through the first gear 541 , the second gear 542 and the worm 543 of the transmission gear set 54 , and the fixed first pivot 511 The transmission is transmitted to the first link 22 , causing the first link 22 to deflect, so that the link assembly 20 pivots, and drives the moving part 30 and the derailleur arm 40 to move. When the first link 22 is deflected, the magnetic sensor 58 rotates relative to the magnet 57. Therefore, the magnetic sensor 58 senses the position change relative to the magnet 57, and the relative position of the derailleur arm 40 can be known.

The motor bracket 26 and the housing 28 are combined to form an accommodating space, so that the motor 52 and the transmission gear set 54 are arranged in the accommodating space to prevent moisture or dust from affecting the operation of the driving assembly 50 . The casing 28 is composed of a casing 281 and a cover 282 . The casing 281 has a top surface 281a, a bottom surface 281b, and a receiving groove 281c. The receiving groove 281c is recessed from the top surface 281a toward the bottom surface 281b and has an upper opening. The driving circuit board 56 is disposed in the receiving groove 281c. The top surface 281a of the housing 281 is provided with an extension plate 284 extending toward the derailleur arm 40 and covering the first pivot end 122. The extension plate 284 extends between the magnet 56 and the magnetic sensor 57, and the magnetic sensor 57 is located on the extension plate Above 284 , one side of the extension plate 284 faces the magnet 57 , and the other side of the extension plate 284 faces the magnetic sensor 58 , so that the magnetic sensor 58 is disposed on the housing 281 corresponding to the magnet 57 . The cover 282 is combined with the casing 281 and covers the top surface 281 a of the casing 281 , the extension plate 284 , the upper opening of the accommodating groove 281 c and the magnetic sensor 58 .

By arranging the drive assembly 50 in the link assembly 20, the overall volume of the rear derailleur 100 can be reduced.

In order to avoid damage to the transmission gear set 54 or the output shaft 521 of the motor 52 caused by the impact of external force or excessive rotational force on the connecting rod assembly 20 , the clutch assembly 55 of the driving assembly 50 may include a first clutch member abutting along a shaft. 551 and a second clutch member 552. The second clutch member 552 engages with the first clutch member 551 and is passed through a shaft rod 511d. In this embodiment, the shaft rod is formed on the first pivot shaft 511. The second clutch member The 552 can generate a clutch with the first clutch member 551 under external force. 8 to 11 , in this embodiment, the first clutch member 551 is provided with a plurality of gear teeth 551a extending radially and a plurality of first clutch teeth 551b extending axially, and the second clutch member 552 is provided with A plurality of second clutch teeth 552a extending axially, the first clutch teeth 551b extend toward the direction of the second clutch member 552 , and the second clutch teeth 552a extend toward the direction of the first clutch member 551 . The first clutch member 551 engages with the worm 543 through the gear teeth 551a, and engages with the second clutch teeth 552a of the second clutch member 552 through the first clutch teeth 551b. Under normal conditions, the second clutch teeth 552a are engaged with the first clutch teeth 551b and do not move relative to each other; when the driving component 50 is subjected to an external force, or the rotational force is greater than a predetermined resistance, that is, the first clutch member 551 and the second clutch are disengaged When the relative rotational torque between the pieces 552 is greater than the predetermined resistance, the first clutch tooth 551b and the second clutch tooth 552a will generate slippage to release the resistance and then mesh.

For example, when the connecting rod assembly 20 is impacted by an external force and the rotational force of the first clutch member 551 is greater than the predetermined resistance, slippage occurs between the first clutch tooth 551b and the second clutch tooth 552a to avoid the driving assembly 50 damaged. In addition, when the movement of the moving part 30 is blocked, the first clutch tooth 551b and the second clutch tooth 552a can also slip, so as to prevent the motor 52 from being damaged due to overheating.

The clutch assembly 55 further includes an elastic member 553. The elastic member 553 is disposed on a force-receiving portion 551c of the first clutch member 551 opposite to the first clutch teeth 551b. The member 553 is disposed in the annular groove 551d, and the elastic member 553, the first clutch member 551 and the second clutch member 552 are sequentially inserted through the first pivot shaft 511. One end of the elastic member 553 abuts against the bottom of the annular groove 551d, and the other end abuts against an extension portion 511c radially extending from the shaft of the first pivot shaft 511. The extension portion 511c can also be accommodated in the annular groove 551d. In this embodiment, the elastic member 553 can be a plurality of disc springs located between the extending portion 511c and the annular groove 551d of the first clutch member 551. The elastic member 553 provides an adjustable thrust. When the extending portion 511c is away from the groove bottom of the annular groove 551d, the force threshold required for the relative slippage between the first clutch member 551 and the second clutch member 552 is relatively small; When the extending portion 511c is close to the groove bottom of the annular groove 551d, the force threshold required for the relative slippage between the first clutch member 551 and the second clutch member 552 is relatively large, and the user can adjust the first clutch member 551 according to their needs The force threshold required to generate relative slip with the second clutch member 552 .

The end of the shaft 511b of the first pivot shaft 511 opposite to the first end 511a is provided with a threaded section 511d, the second clutch member 552 is provided with a screw hole 552b in the axial direction, and the threaded section 511d of the shaft 511b is connected with the second clutch The screw holes 552b of the member 552 are screwed together. When the predetermined resistance is to be adjusted, the relative slippage between the first clutch tooth 551b and the second clutch tooth 552a can be changed by adjusting the screwing depth of the threaded section 511d of the shaft rod 511b and the screw hole 552b of the second clutch member 552 predetermined resistance. In this embodiment, one end 552c of the second clutch member 552 opposite to the second clutch tooth 552a is fixed to the through hole 122d. More specifically, one end 552c of the second clutch member 552 is provided with a pin hole 552d, and the fixing member 17 passes through the pin hole 122e of the second pivot end 122b and the pin hole 552d of the second clutch member 552 to restrict the second clutch The member 552 rotates relative to the second pivot end 122b.

To summarize the above-mentioned driving component 50 and clutch component 55, the driving component 50 can be arranged on one of the first pivot shaft 511 or the third pivot shaft 513 to apply the rotational force from the first link 22, and the clutch component 55 can be arranged on the first pivot shaft 511 or the third pivot shaft 513. One of a pivot shaft 511 or a third pivot shaft 513; the driving assembly 50 can also be arranged on the second link 24 to impart rotational force to one of the second pivot shaft 512 or the fourth pivot shaft 514, and the second link The rod 24 is also provided with the structure of the motor bracket 26 , and the clutch assembly 55 can also be provided on one of the second pivot shaft 512 or the fourth pivot shaft 514 . All of the above aspects can achieve the purpose of driving the link assembly 20 to pivot, thereby driving the moving portion 30 and the derailleur arm 40 to move.

In one embodiment, the driving assembly 50 can also be disposed on the fixing portion 10 . In this case, the first pivot shaft 511 is fixedly connected with the first link 22 , and the driving assembly 50 applies force to the first pivot shaft. 511 to drive the link assembly 20 to pivot; or the second pivot shaft 512 is fixedly connected to the second link 24, and the driving assembly 50 applies force to the second pivot shaft 512 to drive the link assembly 20 to pivot.

The derailleur arm 40 of this embodiment can pivot relative to the moving part 30 . Please refer to FIGS. 12 to 14 , the moving part 30 includes a cover 33 and a rotating component 60 . The first pivoting portion 31 and the second pivoting portion 32 of the moving portion 30 are respectively disposed on the casing 33 , and the casing 33 is provided with a first accommodating space 331 and a first outer cover 332 . The rotating assembly 60 is disposed in the first accommodating space 331 , and the first accommodating space 331 is covered by the first outer cover 332 to prevent moisture or dust from entering the rotating assembly 60 .

The rotating assembly 60 includes a pivot shaft 61 , an elastic member 62 , a bearing 63 and a damping member 64 . One end of the pivot shaft 61 is connected to the derailleur arm 40 , the elastic member 62 is sleeved on the pivot shaft 61 and one end of the elastic member 62 is connected to the derailleur arm 40 to provide torsion force of the pivot shaft 61 along a rotation direction D1 . The elastic member 62 can be a torsion spring. The damping member 64 is disposed between the pivot shaft 61 and the inner wall of the first accommodating space 331 . Specifically, the bearing 63 is sleeved on the pivot shaft 61 and is not connected with the elastic member 62 , the damping member 64 is sleeved on the bearing 63 , and the damping member 64 has an outer abutting surface 641 a and an inner abutting surface 641 b . The peripheral edge is in contact with the pivot shaft 61 , and the outer peripheral edge of the bearing 63 abuts against the inner abutting surface 641 b of the damping member 64 , and the outer abutting surface 641 a of the damping member 64 abuts against the inner wall of the first accommodating space 331 . The bearing 63 can be a one-way bearing. When the rotating component 60 rotates along the rotating direction D1, the inner and outer circumferences of the bearing 63 can rotate relative to each other. When the rotating component 60 rotates along the rotating direction D2, the inner and outer circumferences of the bearing 63 do not rotate. During the relative rotation, the damping member 64 provides a predetermined frictional force to prevent the moving portion 30 from loosening due to vibration or external force acting on the moving portion 30 by the rotating assembly 60 . The rotational direction D2 is opposite to the rotational direction D1.

Specifically, when the derailleur arm 40 is engaged with sprockets with different radii along with the axial pivoting of the drive assembly 50, the derailleur arm 40 will be rotated by the tension of the chain due to the change of the chain position. The chain arm 40 will drive the rotating assembly 60 to rotate along the rotating direction D2. During rotation, the inner abutting surface 641b and the outer abutting surface 641a of the damping member 64 rub against the bearing 63 and the inner wall of the first accommodating space 331 respectively to produce a damping effect to prevent the moving assembly 40 from causing excessive vibration or external force. Shaking or vibration makes the chain jump, which affects the meshing between the chain and the sprocket or causes the chain to drop.

In this embodiment, the damping member 64 is cylindrical to provide abutting force on the bearing 63 . The damping member 64 can also be a plurality of pieces and are distributed on the radial periphery of the bearing 63 . The material of the damping member 64 can be, for example, rubber, super glue, or other elastic bodies that can be compressed to produce radial deformation.

The first outer cover 332 of the moving part 30 constitutes an adjustment piece. The first outer cover 332 is combined with the casing 33 and can exert an axial force on the damping member 64 so that the damping member 64 is pushed and deformed in the radial direction. , changing the frictional force exerted by the outer abutting surface 641a on the inner wall of the first accommodating space 331 and the pressure exerted by the inner abutting surface 641b on the bearing 63 , thereby changing the outer abutting surface 641a of the damping member 64 and the first accommodating surface 641a The frictional force between the inner walls of the space 331 and the frictional force between the inner contact surface 641b of the damping member 64 and the outer peripheral edge of the bearing 63 .

In this embodiment, the cover 33 has an outer side surface 33a away from the derailleur arm 40. The outer side surface 33a is provided with a mounting hole 333 opposite to the first outer cover 332. The mounting hole 333 communicates with the first accommodating space 331, An outer cover 332 extends from the mounting hole 333 into the first accommodating space 331 and is combined with the mounting hole 333 with threads. The first outer cover 332 is provided with an extension portion 332 a extending axially toward the derailleur arm 40 . The extension portion 332 a It abuts against one end of the damping member 64 . By adjusting the relative depth of the first outer cover 332 and the casing 33, the extension portion 332a can be driven to press the damping member 64 axially, so that the damping member 64 is deformed radially, thereby adjusting the locking of the first outer cover 332. The damping force can be adjusted by the position of the mounting hole 333 of the cover 33 .

In this embodiment, the first accommodating space 331 of the cover 33 includes a first accommodating chamber 331a and a second accommodating chamber 331b, and a partition plate 331c is provided between the first accommodating chamber 331a and the second accommodating chamber 331b. 331c is provided with a through hole 331d, the through hole 331d connects the first chamber 331a with the second chamber 331b, and the first chamber 331a is located between the second chamber 331b and the derailleur arm 40 . During installation, the elastic member 62 is disposed in the first chamber 331a, one end of the elastic member 62 is disposed on the derailleur arm 40, and the other end is disposed on one side of the partition plate 331c, and then the pivot shaft 61 passes through the elastic member 62 and the through hole 331d. The bearing 63 and the damping member 64 are disposed in the second chamber 331 b , the bearing 63 is sleeved on the pivot shaft 61 , the damping member 64 is sleeved on the bearing 63 , and the first outer cover 332 covers the mounting hole 333 . One end of the damping member 64 abuts against the other side of the partition plate 331c, and the other end abuts against the extension portion 332a of the first outer cover 332. When damping is to be adjusted, the damping member can be squeezed together by the partition plate 331c and the extension portion 332a. 64, so that both ends of the damping member 64 are deformed evenly.

In this embodiment, the pivot shaft 61 may include a first part 611 and a second part 612 , the first part 611 is connected to the derailleur arm 40 , and the second part 612 is detachably connected to the first part 611 , the first part 611 and the second part 612 is threaded. The first portion 611 of the pivot shaft 61 and the elastic member 62 are disposed in the first chamber 331a, and the second portion 612 of the pivot shaft 61 is disposed in the second chamber 331b. In addition, the second part 612 is provided with a radially extending flange 612a, the flange 612a is adjacent to the partition plate 331c, when the bearing 63 is sleeved on the second part 612 of the pivot shaft 61, one end of the bearing 63 faces the flange 612a, The other end faces the mounting hole 333 . One end of the second part 612 is provided with a driven rotation hole 613 (eg, a hexagonal hole) for a tool to rotate the second part 612 . When the second part 612 is screwed out toward the mounting hole 333 , the flange 612 a pushes against the bearing 63 and pushes the bearing 63 toward the mounting hole 333 , so as to facilitate the removal of the bearing 63 .

The first outer cover 332 is provided with a through hole 332 b corresponding to the driven rotation hole 613 of the second portion 612 . The hole diameter of the through hole 332 b is larger than the driven rotation hole 613 . A tool can be inserted into the driven rotation hole 613 through the through hole 332b to rotate the second part 612, so that the second part 612 of the pivot shaft 61 can be connected to the first part without disassembling the bearing 63 and the damping member 64 611 is separated to facilitate the replacement of the worn elastic member 62.

The damping structure of the moving portion 30 is not limited to the electronic rear derailleur of this embodiment, and can also be applied to other rear derailleurs without motor drive, which can also provide the damping effect of the derailleur arm 40 . In other words, the driving assembly can be coupled to the connecting rod assembly 20 by a steel cable, so as to drive the connecting rod assembly 20 to pivot.

15 to 20 , the rear derailleur 100 of this embodiment further includes a detachable battery module 80 that provides power to the motor 52 , the driving circuit board 56 , and the magnetic sensor 58 .

The battery module 80 is disposed at the moving part 30 , the casing 33 of the moving part 30 is further provided with a second accommodating space 334 , the battery module 80 is disposed in the second accommodating space 334 , and the battery module 80 is electrically connected to the driving circuit board 56 , to provide power to the motor 52 via the drive circuit board 56 . The first accommodating space 331 and the second accommodating space 334 extend in different directions respectively and are not connected. The second accommodating space 334 is disposed on the periphery of the wall surface of the first accommodating space 331 . In this embodiment, the position of the second accommodating space 334 is closer to a ground than the first accommodating space 331 , that is, the position of the second accommodating space 334 is lower than the position of the first accommodating space 331 . Preferably, the thickness T of the thinnest part between the wall surface of the second accommodating space 334 and the wall surface of the first accommodating space 331 is within 5 mm.

The casing 33 includes a casing 330 and a second outer cover 335 . The casing 330 has at least a part of a first accommodating space 331 and a second accommodating space 334 , and the second outer cover 335 covers the second accommodating space 334 . The outer surface of the casing 33 is provided with an opening 336 which communicates with the second accommodating space 334 . The opening 336 in this embodiment is provided on a side wall away from the link assembly 20 , and can also be provided in a side wall away from the derailleur arm 40 . The side wall (not shown) does not affect the function of the present disclosure, and the second outer cover 335 is combined with the side wall and closes the opening 336 . The second outer cover 335 defines a space 335 a , and the space 335 a constitutes a part of the second accommodating space 334 . In this embodiment, a part of the battery module 80 is disposed in the second accommodating space 334 of a part of the casing 330 , and another part of the battery module 80 protrudes from the opening 336 and is disposed in the space 335 a of the second outer cover 335 .

The cover 33 has an inner side 33b (refer to FIG. 18 ), the inner side 33b faces away from the outer side 33a and faces the derailleur arm 40 , and the cover 33 and the second accommodating space 334 are located between the outer side 33a and the inner side 33b . There is a distance L between the inner side surface 36b and the derailleur arm 40, so that the battery module 80 is not easily collided with the chain. Preferably, the distance L is more than 1 cm.

The casing 33 is provided with a wire hole 337 (refer to FIG. 19 ), and the wire hole 337 communicates with the second accommodating space 334 and the outside. The battery module 80 includes a battery box 81 , two batteries 82 and a power cord 83 . The battery 82 is located in a box body 81a of the battery box 81 and is covered by a box cover 81b. The battery box 81 is provided with a through hole 81c that communicates the inside and the outside of the battery box 81. The through hole 81c corresponds to the threading hole 337. For power transmission, the power line 83 passes through the through hole 81c and passes through the wire hole 384 to be connected to the drive assembly 50 . In practice, at least one battery 82 can be installed in the battery box 81 .

As shown in FIG. 20 , the casing 28 of the first link 22 is provided with a wire hole 286 connected to the interior of the casing 28 for the power cord 83 to pass through.

Additionally, the battery 82 may be a rechargeable battery. The battery module 80 further includes a coil 84 and a wireless charging circuit 85 , and the wireless charging circuit 85 is electrically connected to the coil 84 and the battery 82 . The coil 84 receives external charging energy and converts it into electrical energy for the wireless charging circuit 85 . The wireless charging circuit 85 converts the electrical energy into charging power and outputs it to charge the battery 82 . The coil 84 has a receiving surface 842 for receiving external charging energy, and the coil 84 can be disposed on one of the fixed part 10 , the link assembly 20 and the moving part 30 . Preferably, the coil 84 is disposed on a component away from the derailleur arm 40, and the receiving surface 842 of the coil 84 faces an outer direction of one of the fixed part 10, the link assembly 20, and the moving part 30, so as to facilitate wireless charging This can reduce the interference of debris between the device and the coil 84 and improve the stability of providing charging energy to the coil 84 .

In this embodiment, the wireless charging circuit 85 is located inside the battery box 81 , and the power cord 83 is electrically connected to the wireless charging circuit 85 . The coil 84 is located at the bottom of the battery box 81 and is far away from the rotating assembly 60 , and the receiving surface 842 of the coil 84 is located opposite to the outer direction of the battery 82 (ie, facing downward), so as to be located under the casing 33 of the moving part 30 The coil 84 is supplied with charging energy by a wireless charger (not shown).

In one embodiment, as shown in FIG. 21 , the coil 84 is located at the top of the battery box 81 , and the receiving surface 842 of the coil 84 also faces the upper part of the moving part 30 (ie, the outer direction is upward).

In one embodiment, as shown in FIG. 22 , the coil 84 is located in the space 335a of the second outer cover 335, and the receiving surface 842 is disposed away from the outer side of the connecting rod assembly 20 and faces the inner wall surface of the second outer cover 335; Or as shown in FIG. 23 , the receiving surface 842 of the coil 84 faces the outward direction of the moving portion 30 away from the derailleur arm 40 .

In one embodiment, as shown in FIG. 24 , the coil 84 is located in the groove 281 c in the housing 28 of the link assembly 20 , and the receiving surface 842 faces the outer side of the link assembly 20 away from the derailleur arm 40 .

In one embodiment, as shown in FIG. 25 , the battery 82 , the coil 84 , and the wireless charging circuit 85 are located in the cavity 281 c of the housing 28 of the link assembly 20 , and the housing 33 of the moving part 30 is not provided with a second cavity.

In one embodiment, as shown in FIG. 26 , similar to FIG. 25 , but the coil 84 is located inside the cover 282 of the link assembly 20 , and the receiving surface 842 faces the inner wall surface of the cover 282 , that is, the receiving surface 842 faces the connecting Above the rod assembly 20 .

In one embodiment, as shown in FIG. 27 , the coil 84 is located at the bottom of the housing 28 of the linkage assembly 20 , and the receiving surface 842 is away from the cover 282 , that is, the receiving surface 842 faces the lower part of the linkage assembly 20 .

In one embodiment, as shown in FIG. 28 , the fixing part 10 includes a casing 12 a , the battery 82 , the wireless charging circuit 85 , and the coil 84 are located in the casing 12 a , and the receiving surface 842 faces the fixing part 10 away from the derailleur arm 40 one direction. In other embodiments, the receiving surface 842 of the coil 84 may also face above, below, or away from the outer side of the connecting rod assembly 20 of the fixing portion 10 , which will not be repeated here.

To sum up the above, the rear derailleur of the present invention has the following advantages:

1. The clutch assembly 55 (which can be provided on the first connecting rod 22 or the second connecting rod 24 ) can generate a clutch when the connecting rod assembly 20 is hit by an external force, so as to avoid damage to the transmission gear set 54 or the output shaft 521 of the motor 52 . In addition, when the moving part 30 is blocked, the clutch assembly can also generate a clutch to prevent the motor 52 from overheating.

2. The drive assembly 50 is disposed on the connecting rod assembly 20, so that the overall volume of the rear derailleur 100 can be reduced, and the disadvantage of the conventional electronic rear derailleur 100 being oversized can be improved.

3. The battery module 80 is arranged on the rear derailleur 100 , and the distance for power supply is short, which can simplify the wiring of the power cord 83 .

4. The wireless charging technology is adopted and the coil 84 for wireless charging is arranged on the components of the rear derailleur 100, which makes the charging of the rechargeable battery of the rear derailleur 100 more convenient, and there is no need to set a charging interface on the battery module 80, It makes charging more convenient and avoids damage to the battery components caused by the loss of the charging interface.

5. The damping member 64 cooperates with the bearing 63 to produce a damping effect to slow down the swinging speed of the derailleur arm 40 and prevent the chain from jumping, thereby affecting the engagement between the chain and the sprocket or causing the chain to drop.

The above are only preferred and feasible embodiments of the present invention, and all equivalent changes made by applying the description of the present invention and the scope of the patent application should be included in the patent scope of the present invention.

Claims (13)

1. A rear derailleur for a bicycle, comprising:

a fixing part connected to a frame;

a connecting rod component pivoted to the fixing part;

the moving part is pivoted to the connecting rod assembly;

a chain shifting arm connected to the moving part;

the driving assembly comprises a motor and a transmission gear set, the motor comprises an output shaft to drive the transmission gear set, the transmission gear set is coupled with the connecting rod assembly, and the output shaft of the motor drives the connecting rod assembly to pivot through the transmission gear set so as to drive the moving part and the chain shifting arm to move;

the movable part is provided with a pivot shaft and a detachable battery module, the shifting link arm is pivoted on the pivot shaft, and the battery module provides power for the motor.

2. The rear derailleur of claim 1, wherein the moving portion includes a housing having a first receiving space and a second receiving space, the pivot shaft being disposed in the first receiving space, and the battery module being disposed in the second receiving space.

3. The rear derailleur of claim 2, wherein the cover has an outer side and an inner side, the outer side being distal from the derailleur arm, the second receiving space being located between the outer side and the inner side; a distance is arranged between the inner side surface and the chain shifting arm.

4. The rear derailleur of claim 2, wherein the second receiving space is located at a periphery of a wall surface of the first receiving space.

5. The rear derailleur of bicycle according to claim 4, wherein a thickness of a thinnest portion between the wall surface of the second receiving space and the wall surface of the first receiving space is not more than 5 mm at the maximum.

6. The rear derailleur of claim 2, wherein the cover includes a housing having at least a portion of the first receiving space and the second receiving space, and an outer cover coupled to the side wall of the housing and closing the opening, wherein a side wall of the housing has an opening communicating with the second receiving space.

7. The bicycle rear derailleur according to claim 6, wherein the opening faces in a direction away from one of the linkage assembly or the derailleur arm.

8. The rear derailleur of a bicycle as claimed in claim 6, wherein the outer cover has a space that constitutes a part of the second receiving space.

9. The rear derailleur of the bicycle of claim 2, wherein the second receiving space is located lower than the pivot shaft.

10. The rear derailleur of bicycle as claimed in claim 2, wherein the cover has a threading hole, the threading hole communicating the second receiving space with the outside; the battery module comprises a battery box, at least one battery and a power line, wherein the at least one battery is arranged in the battery box, the battery transmits power through the power line, and the power line penetrates through the threading hole.

11. The rear derailleur for bicycle of claim 10, wherein said battery case has a through hole communicating the inside and the outside of said battery case, said through hole corresponding to said threading hole; the power cord respectively wears to locate the through-hole with the through wires hole.

12. The rear derailleur of claim 1, wherein the rear derailleur comprises a coil and a wireless charging circuit, the wireless charging circuit being electrically connected to the coil; the battery module comprises a rechargeable battery electrically connected with the wireless charging circuit; the coil is disposed on one of the fixed portion, the moving portion, and the link assembly.

13. The rear derailleur for bicycles of claim 12, wherein the coil has a receiving surface for receiving externally charged energy, the receiving surface facing away from the derailleur arm.

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