CN117048766A

CN117048766A - Motor unit for bicycle derailleur

Info

Publication number: CN117048766A
Application number: CN202310915758.7A
Authority: CN
Inventors: 长谷川彰浩
Original assignee: Shimano Inc
Current assignee: Shimano Inc
Priority date: 2020-06-30
Filing date: 2021-09-01
Publication date: 2023-11-14
Also published as: CN114132425A; CN114132425B; TW202210355A; DE102020211139A1

Abstract

A motor unit 14 for a bicycle derailleur 10 includes an output shaft 24, a motor 26, a drive gear 28, an output gear 30, an intermediate gear structure 32 and an angle sensor 34. The motor 26 includes a motor shaft 36. The drive gear 28 is on the motor shaft 36 of the motor 26 and the output gear 30 is on the output shaft 24. The intermediate gear structure 32 is located in the load path between the drive gear 28 and the output gear 30, and the intermediate gear structure 32 includes at least one reduction gear 38 and an encoder 40. The angle sensor 34 is configured to detect rotation of the encoder 40. The rotation ratio between the encoder 40 and the output gear 30 is such that the encoder 40 rotates less than 360 degrees.

Description

Motor unit for bicycle derailleur

The present application is a divisional application of China patent application with the application date 2021, 9 and 1, the application number 2021110199100 and the application name "motor unit for bicycle derailleur".

Background

Many bicycles have a chain drive transmission system that includes a plurality of front sprockets and a plurality of rear sprockets. The rider can increase or decrease the gear ratio of the transmission system by a shift operation that moves the chain from one sprocket to another sprocket through the derailleur. In an electronic derailleur system, movement of the derailleur is controlled by a motor unit. To move the chain from one sprocket to another, the motor unit determines which sprocket is currently engaged with the chain and the amount of movement required to achieve the desired gear based on the position of the derailleur. In some cases, such as power interruption, backlash, or skip stops, the motor unit may lose the information needed to determine the position of the derailleur. Challenges exist in designing a motor unit for an electronic bicycle derailleur that can determine the position of the derailleur in the event of a power interruption, backlash, or jump stop.

Disclosure of Invention

The present application discloses a motor unit for a bicycle derailleur that has been developed to solve the above-mentioned problems. According to a first aspect of the present application, a motor unit for a bicycle derailleur includes an output shaft, a motor, a drive gear, an output gear, an intermediate gear structure and an angle sensor. The motor includes a motor shaft. The driving gear is arranged on the motor shaft of the motor. The output gear is on the output shaft. An intermediate gear structure is located in the load path between the drive gear and the output gear, and the intermediate gear structure includes at least one reduction gear and an encoder. The angle sensor is configured to detect rotation of the encoder. The rotation ratio between the encoder and the output gear is such that the encoder rotates less than 360 degrees.

With the motor unit for a bicycle derailleur according to the first aspect, a compact motor unit can be provided in which the output gear rotates through its full range, while the encoder rotates less than 360 degrees, allowing the rotation of the encoder to be determined after a power interruption.

According to a second aspect of the present application, the motor unit for a bicycle derailleur according to the first aspect is configured such that the rotatable range of the output gear is limited by the rotation limiting structure of the bicycle derailleur. With the motor unit for a bicycle derailleur according to the second aspect, the rotatable range of the output gear can be limited to prevent the encoder from rotating more than 360 degrees.

According to a third aspect of the present application, the motor unit for a bicycle derailleur according to the second aspect is configured such that the main body of the bicycle derailleur and the motor unit are connected to the links of the bicycle derailleur, and the limitation of the rotatable range is mechanical. With the motor unit for a bicycle derailleur according to the third aspect, it is possible to rotate the link of the bicycle derailleur and limit the rotatable range in the event of a power interruption.

According to a fourth aspect of the present application, the motor unit for a bicycle derailleur according to the second aspect is configured such that the output gear contacts the housing of the motor unit and the limitation of the rotatable range of the output gear is electric. With the motor unit for a bicycle derailleur according to the fourth aspect, the limitation of the rotatable range of the output gear can be electrically adjusted.

According to a fifth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to fourth aspects is configured such that the output gear is non-circular. With the motor unit for a bicycle derailleur according to the fifth aspect, the efficiency and battery life of the motor unit can be increased by transmitting a variable rotation ratio of the output gear.

According to a sixth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to fifth aspects is configured such that the output gear is a sector gear. With the motor unit for a bicycle derailleur according to the sixth aspect, the size and weight of the output gear can be reduced.

According to a seventh aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to sixth aspects is configured such that the rotational force of the output shaft is transmitted to the connecting rod of the bicycle derailleur. With the motor unit for a bicycle derailleur according to the seventh aspect, the link of the bicycle derailleur can be moved to move the chain to a desired sprocket.

According to an eighth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to seventh aspects is configured such that the bicycle derailleur is a front bicycle derailleur that includes a base member, a linkage mechanism and a chain guide. With the motor unit for a bicycle derailleur according to the eighth aspect, the position of the front bicycle derailleur can be determined with respect to the plurality of front sprockets after the power is interrupted.

According to a ninth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to seventh aspects is configured such that the bicycle derailleur is a rear bicycle derailleur that includes a base member, a movable member, a linkage mechanism and a chain guide. With the motor unit for a bicycle derailleur according to the ninth aspect, the position of the rear bicycle derailleur can be determined with respect to the plurality of rear sprockets after the power is interrupted.

According to a tenth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to ninth aspects is configured such that the motor unit is disposed within a base member of the bicycle derailleur. With the motor unit for a bicycle derailleur according to the tenth aspect, the motor unit can be protected from damage while providing an aerodynamic and aesthetic bicycle derailleur.

According to an eleventh aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to tenth aspects is configured such that the bicycle derailleur includes a power interface configured to be connected to a battery, and the power interface is electrically connected to the motor. With the motor unit for a bicycle derailleur according to the eleventh aspect, the motor unit can be powered by a battery provided on the bicycle.

According to a twelfth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to eleventh aspects further includes a housing and a wireless communication unit. The motor, at least a portion of the output shaft and the intermediate gear structure are disposed in a housing of the motor unit. The wireless communication unit is configured to communicate with an additional wireless communication unit disposed on an additional bicycle component. With the motor unit for a bicycle derailleur according to the twelfth aspect, the motor unit can be protected from damage and wireless communication between the motor unit and an additional bicycle component can be assisted.

According to a thirteenth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to twelfth aspects further includes a controller configured to calculate an angle of one of the output gear and the output shaft based on a detection value of the angle sensor. With the motor unit for a bicycle derailleur according to the thirteenth aspect, the angle of the output gear or the output shaft can be determined from the value of the angle sensor.

According to a fourteenth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to thirteenth aspects is configured such that the angle sensor is a magnetic sensor. With the motor unit for a bicycle derailleur according to the fourteenth aspect, the value of the angle sensor can be determined under extreme environmental conditions such as high temperature.

According to a fifteenth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to thirteenth aspects is configured such that the angle sensor is an optical sensor. With the motor unit for a bicycle derailleur according to the fifteenth aspect, the value of the angle sensor can be quickly and accurately determined under the condition of surrounding magnetic interference.

According to a sixteenth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to fifteenth aspects is configured such that the encoder rotates in response to rotation of a motor shaft of the motor. With the motor unit for a bicycle derailleur according to the sixteenth aspect, the position of the output gear can be controlled in accordance with the rotation of the motor shaft.

According to a seventeenth aspect of the present application, the motor unit for a bicycle derailleur according to any one of the first to sixteenth aspects is configured such that the encoder is rotatably disposed on a first shaft of the intermediate gear structure, the output gear is rotatably disposed on a second shaft, and the second shaft is adjacent to the first shaft without another shaft therebetween. With the motor unit for a bicycle derailleur according to the seventeenth aspect, the size of the motor unit can be minimized while maintaining the ability to accurately determine the position of the output shaft and/or the output gear.

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Furthermore, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure. The term "small and/or light vehicle" as used herein refers to electric and non-electric vehicles regardless of the number of wheels thereof, but does not include four-wheeled vehicles having an internal combustion engine as a power source for driving the wheels, or four-wheeled electric vehicles requiring a license to travel on a public road.

Drawings

A more complete appreciation of the application and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:

FIG. 1 is a right side elevational view of an example bicycle that incorporates a motor unit for a bicycle derailleur in accordance with the present application;

FIG. 2 is a schematic outline view of a bicycle;

FIG. 3A is a side elevational view of the rear bicycle derailleur with the guide chain engaged with the bicycle sprocket in accordance with the present application;

FIG. 3B is an illustration of a front bicycle derailleur in accordance with the present application;

FIG. 4 is an exploded view of the motor unit for the bicycle derailleur in accordance with the present application;

FIG. 5 is a side elevational view of the gear structure in the motor unit for the bicycle derailleur in accordance with the present application;

FIG. 6 is a top plan view of the gear structure in the motor unit for the bicycle derailleur in accordance with the present application;

FIGS. 7A-7C are illustrations of a gear structure in a motor unit for a bicycle derailleur in accordance with the present application; and

FIG. 8 is a schematic block diagram of a motor unit for a bicycle derailleur in accordance with the present application.

Reference numerals illustrate:

1. bicycle with wheel

2. Frame of bicycle

3. Rear wheel

4. Front fork

5. Front wheel

6. Pedal plate

7. Crank arm

8. Crank axle

9. Bicycle chain

10. Bicycle derailleur

10A rear bicycle derailleur

10B front bicycle derailleur

12. Bicycle chain wheel

12A rear sprocket

12B front sprocket

14. Motor unit

16A base member

16B base member

18A movable member

20A link mechanism

20B link mechanism

22A chain guide

22B chain guide

24. Output shaft

26. Motor with a motor housing

28. Driving gear

30. Output gear

32. Intermediate gear structure

34. Angle sensor

36. Motor shaft

38. Reduction gear

38A first reduction gear

38B second reduction gear

40. Encoder with a plurality of sensors

42. First shaft

44. Second shaft

46. Upper gear shaft supporting member

48. Lower gear shaft supporting member

50. Outer casing

52. Rotation limiting structure

56. Power interface

58. Battery cell

60. Controller for controlling a power supply

62. Wireless communication unit

64. Additional wireless communication unit

66. Additional bicycle component

68. Switch

130. Non-circular output gear

230. Sector gear

P1 axial center plane

Detailed Description

Certain embodiments will now be explained with reference to the drawings, wherein like reference numerals designate corresponding or identical elements throughout the various figures. It will be apparent to those skilled in the art from this disclosure that the following descriptions of the embodiments are provided for illustration only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.

Referring initially to FIG. 1, an exemplary bicycle 1 is illustrated with a bicycle derailleur 10 having a motor unit 14 in accordance with at least one disclosed embodiment of the present application. The bicycle 1 is an off-road bicycle such as an on-road bicycle or a mountain bicycle, for example. Alternatively, the bicycle 1 can be a road type bicycle. As shown in the schematic outline view of fig. 2, the bicycle 1 may have an axial center plane P1 defining the left and right halves of the bicycle 1. The following directional terms "front", "rear", "forward", "rearward", "left", "right", "transverse", "upward" and "downward", as well as any other similar directional terms refer to those directions defined, for example, as if a rider were sitting upright on the saddle of the bicycle 1 while facing the handlebar.

With continued reference to fig. 1, the bicycle 1 includes a frame 2 that is attached to a rear wheel 3. The front fork 4 attaches the front wheel 5 to the frame 2. Pedals 6 on both sides of the bicycle 1 are attached to corresponding crank arms 7. The crank arms 7 are mounted at 180 degrees to each other on both sides of the frame 2 and are connected by a crank axle 8 (shown by a broken line). The bicycle 1 of this embodiment is driven by a chain drive transmission system that includes a bicycle chain 9, a bicycle derailleur 10 and a bicycle sprocket 12. It will be appreciated that the bicycle derailleur 10 described herein can be configured as either or both of a rear bicycle derailleur 10A and a front bicycle derailleur 10B. Similarly, the bicycle sprocket 12 as described herein can refer to one of the plurality of rear sprockets 12A and/or one of the plurality of front sprockets 12B.

The bicycle chain 9 is engaged with one of the front sprockets 12B and one of the rear sprockets 12A in an engaged state, as described below with reference to FIGS. 4 and 5. The driving force applied to the pedal 6 rotates the crank shaft 8 and the front sprocket 12B. When the front sprocket 12B rotates, the bicycle chain 9 is driven around the rear sprocket 12A, which transmits power to the rear wheel 3 to propel the bicycle 1. Thus, the front bicycle derailleur 10B shifts the bicycle chain 9 between the front sprockets 12B and the rear bicycle derailleur 10A shifts the bicycle chain 9 between the rear sprockets 12A. As described in detail below, shifting of the bicycle chain by the rear bicycle derailleur 10A and/or the front bicycle derailleur 10B can be facilitated by the motor unit 14 included in one or both of the rear bicycle derailleur 10A and the front bicycle derailleur 10B. Shifting of the bicycle chain 9 changes the gear ratio of the chain drive transmission to increase or decrease the distance traveled by the pedals 6 per rotation. Other parts of the bicycle 1 are known and will not be described here.

FIG. 3A shows a side view of the rear bicycle derailleur 10A in accordance with the present application. The rear bicycle derailleur 10A includes a base member 16A, a movable member 18A, a linkage mechanism 20A and a chain guide 22A. In the configuration described in detail below, the motor unit 14 is disposed within the base member 16 of the bicycle derailleur 10, but the motor unit 14 could alternatively be configured to be disposed within other components of the derailleur. The motor unit 14 may be provided at one of the movable member 18A and the link mechanism 20A. FIG. 3B shows a schematic view of the front bicycle derailleur 10B. The bicycle derailleur 10 can be a front bicycle derailleur 10B that includes a base member 16B, a linkage mechanism 20B and a chain guide 22B.

Referring to FIGS. 4 and 8, the bicycle derailleur 10 includes a wireless communication unit 62, with the wireless communication unit 62 configured to communicate with an additional wireless communication unit 64 disposed on an additional bicycle component 66. The motor unit 14 can include a wireless communication unit 62, but the wireless communication unit 62 can alternatively be disposed within other components of the bicycle derailleur 10. In the embodiment described herein, it will be appreciated that the wireless communication unit 62 can be included in either of the bicycle rear derailleur 10A and the bicycle front derailleur 10B.

FIG. 4 is an exploded view of the motor unit 14 for the bicycle derailleur 10 in accordance with the present application. The motor unit 14 includes an output shaft 24, a motor 26, a drive gear 28, an output gear 30, an intermediate gear structure 32, and an angle sensor 34. The motor 26 includes a motor shaft 36, and the drive gear 28 is disposed on the motor shaft 36. An output gear 30 is provided on the output shaft 24. An intermediate gear structure 32 is located in the load path between the drive gear 28 and the output gear 30. The intermediate gear structure 32 includes at least one reduction gear 38 and an encoder 40. In the embodiment described herein, the intermediate gear structure 32 includes two reduction gears 38A, 38B and one encoder 40. However, it is understood that the intermediate gear structure 32 may be configured to include one reduction gear, three reduction gears, or any other suitable number of reduction gears. In the embodiment shown, the angle sensor 34 is configured as a magnetic sensor. It will be appreciated that the angle sensor may alternatively be configured as an optical sensor or any other suitable type of sensor.

Each gear in the intermediate gear structure 32 is rotatably disposed on a respective shaft. The encoder 40 is rotatably disposed on a first shaft 42 of the intermediate gear structure 32 and the output gear is rotatably disposed on a second shaft 44. As illustrated in fig. 4-6 for the motor unit 14, the second shaft 44 is configured adjacent to the first shaft 42 with no other shaft therebetween. However, it will be appreciated that the first and second shafts 42, 44 may alternatively be configured to be separated by one or more gears of an intermediate gear structure and the shafts. The shaft is supported by an upper gear shaft support member 46 and a lower gear shaft support member 48. As shown in the exploded view of fig. 4, and with reference to fig. 8, the motor unit 14 further includes a housing 50, with the motor 26, at least a portion of the output shaft 24, and the intermediate gear structure 32 disposed in the housing 50. The housing 50 includes a substrate. In the assembled state, the wireless communication unit 62 is disposed in the substrate. The intermediate gear structure 32 is disposed on a first side of the housing 50 relative to the base plate, and the wireless communication unit 62 is disposed on a second side of the housing 50 relative to the base plate, the second side being opposite the first side.

In the configuration of the motor unit 14 described herein, the rotatable range of the output gear 30 is limited by the rotation limiting structure 52 of the bicycle derailleur 10. The angle sensor 34 is configured to detect rotation of the encoder 40, the rotation ratio between the encoder 40 and the output gear 30 being such that the encoder 40 rotates less than 360 degrees. The following formula 1 shows a general formula for this configuration, where G is the gear, n is the gear number, R is the rotation ratio between the nth gear and the nth' gear, θ _n Is the rotation angle of the nth gear.

Equation 1: θ _n ×R(G _n :G _n' )＝θ _n' ＜360°

Shown below are example formulas for different positions of encoder 40 relative to output gear 30. In the example formulas shown herein, the output gear 30 is denoted as G ₀ ，θ ₀ Is the rotatable angle of the output gear 30. In a preferred embodiment, the rotation ratio between the output gear 30 and the encoder 40 is in the range between 4.5 and 7. When the encoder 40 is a gear adjacent to the output gear 30 (G ₁ ) Or a gear (G) disposed adjacent to the output gear 30 ₁ ) In the above, the formula is shown in the following formula 2.

Equation 2: θ ₀ ×R(G ₀ :G ₁ )＝θ ₁ ＜360°

When the encoder 40 is a gear (G) which is two gears apart from the output gear 30 ₂ ) Or a gear (G) provided at a distance from the output gear 30 ₂ ) In the above, the formula is shown in the following formula 3.

Equation 3: θ ₀ ×[R(G ₀ :G ₁ )×R(G ₁ :G ₂ )]＝θ ₂ ＜360°

When the encoder 40 is the gear (G3) three gears apart from the output gear 30 or is provided on the gear (G3) three gears apart from the output gear 30, the formula is as shown in the following formula 4.

Equation 4: θ ₀ ×[R(G ₀ :G ₁ )×R(G ₁ :G ₂ )×R(G ₂ :G ₃ )]＝θ ₃ ＜360°

The limitation of the rotatable range may be mechanical when a portion of the main body of the bicycle derailleur 10 (e.g., the base member 16 or the movable member 18) and the motor unit are coupled to the links of the bicycle derailleur 10. Alternatively, the limitation of the rotatable range of the output gear 30 may be electric when the output gear 30 contacts the housing 50 of the motor unit 14.

As described below with reference to fig. 8, the motor unit 14 further includes a controller 60, and the controller 60 is configured to calculate an angle of one of the output gear 30 and the output shaft 24 based on a detection value of the angle sensor 34. Because the encoder is limited to less than 360 ° rotation, the controller 60 can determine the state of the bicycle derailleur 10 (e.g., the relative positions of the base member and the movable member) based on the rotation ratio between the encoder 40 and the output gear 30, even in the event of a data loss (e.g., a power interruption, backlash, or a jump) related to the position of the bicycle derailleur 10, thereby determining the gear ratio of the transmission system.

Fig. 5 and 6 show a side view and a top view, respectively, of the gear structure of the motor unit 14. A motor 26, including a motor shaft 36, drives the drive gear 28. The drive gear 28 drives at least one reduction gear 38, which reduction gear 38 in turn drives an encoder 40. Accordingly, the encoder 40 is configured to rotate in response to rotation of the motor shaft 36 of the motor 26. The encoder 40 drives the output gear 30, the output gear 30 in turn drives an output shaft, and the rotational force of the output shaft is transmitted to the links of the bicycle derailleur 10 to move the derailleur 10. The encoder 40 may have a reduction gear function so that the encoder 40 reduces the rotational speed transmitted from the reduction gear 38.

Referring to FIG. 7A, a schematic diagram of a gear structure in the motor unit 14 for the bicycle derailleur 10 is illustrated in accordance with the present application. As described above, the motor 26 including the motor shaft 36 drives the drive gear 28. In the gear structure shown in fig. 7A, the drive gear 28 is a worm wheel. Additionally or alternatively, the drive gear may be a circular gear, a non-circular gear, a sector gear, or any other suitable gear type. The angle sensor 34 is configured to detect rotation of the encoder 40, the encoder 40 driving the output gear 30 and the output shaft. In the embodiment shown in fig. 7A, the output gear 30 is circular, however, it will be appreciated that the output gear may alternatively be configured as a non-circular output gear 130 (as shown in fig. 7B), a sector gear 230 (as shown in fig. 7C), or any other suitable gear type.

Referring to FIG. 8, a block diagram of the motor unit 14 for the bicycle derailleur 10 is illustrated in accordance with the present application. To power the motor 26, the bicycle derailleur 10 includes a power interface 56 configured to be coupled to a battery 58, and the power interface 56 is electrically coupled to the motor 26. As described above and schematically shown in fig. 8, the motor unit 14 further includes a controller 60, and the controller 60 calculates the angle of the output gear 30 or the output shaft 24 based on the detection value of the angle sensor 34 provided on the encoder 40. As described above with reference to fig. 3B, the wireless communication unit 62 is configured to communicate with an additional wireless communication unit 64 provided on an additional bicycle component 66. The additional bicycle component 66 can be, for example, an additional controller, and can be in communication with one or more switches 68. While fig. 8 depicts the additional bicycle component 66 as being powered by the same battery 58 as the motor unit 14, it will be appreciated that in another configuration, the additional bicycle component 66 could be powered by a separate battery. The one or more switches 68 are configured to receive a shift command from the rider to initiate a shift operation. Accordingly, the one or more switches 68 can be configured as a shifter mounted on the handlebar of the bicycle 1. While it is described above that the additional bicycle component 66 can be an additional controller, it will be appreciated that the additional wireless communication unit 64 can be provided on any suitable additional bicycle component.

While only selected embodiments have been chosen to illustrate the present application, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the application as defined in the appended claims. For example, the size, shape, location, or orientation of the various components may be changed as needed and/or desired. Components shown directly connected or contacting each other may have intermediate structures disposed between them. The functions of one element may be performed by two, and vice versa. The structure and function of one embodiment may be employed in another embodiment. Not all advantages may be present in a particular embodiment at the same time. Each feature, alone or in combination with other features, is also contemplated as a separate description of the further application by the applicant, including the structural and/or functional concepts embodied by such features. Accordingly, the foregoing description of the embodiments according to the present application is provided for illustration only, and not for the purpose of limiting the application as defined by the appended claims and their equivalents.

Claims

1. A motor unit (14) for a bicycle derailleur (10), comprising:

an output shaft (24);

-a motor (26), the motor (26) comprising a motor shaft (36);

-a drive gear (28), said drive gear (28) being on the motor shaft (36) of the motor (26);

an output gear (30), the output gear (30) being on the output shaft (24);

an intermediate gear structure (32), said intermediate gear structure (32) being located in a load path between said drive gear (28) and said output gear (30), and said intermediate gear structure (32) comprising at least one reduction gear (38) and one encoder (40); and

an angle sensor (34), the angle sensor (34) being configured to detect a rotation of the encoder (40),

the encoder is located between the output gear and the at least one reduction gear.

2. The motor unit for a bicycle derailleur according to claim 1, wherein

The at least one reduction gear includes a first reduction gear, and

the encoder is adjacent to the first reduction gear with no further gear therebetween.

3. A motor unit (14) for a bicycle derailleur (10), comprising:

an output shaft (24);

-a motor (26), the motor (26) comprising a motor shaft (36);

an output gear (30), the output gear (30) being on the output shaft (24);

the at least one reduction gear includes a first reduction gear, and

4. A motor unit for a bicycle derailleur according to claim 2 or 3, wherein

The at least one reduction gear includes a second reduction gear, and

the first reduction gear is located between the encoder and the second reduction gear.

5. A motor unit for a bicycle derailleur according to claim 1 or 3, wherein

The at least one reduction gear is located between the encoder and the drive gear.

6. A motor unit for a bicycle derailleur according to claim 1 or 3, wherein

The rotation ratio between the encoder (40) and the output gear (30) is such that the encoder (40) rotates less than 360 degrees.

7. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the rotatable range of the output gear (30) is limited by a rotation limiting structure (52) of the bicycle derailleur (10).

8. The motor unit (14) for a bicycle derailleur (10) according to claim 7, wherein the limitation of the rotatable range is mechanical in the configuration of the main body of the bicycle derailleur (10) and the linkage of the motor unit (14) to the bicycle derailleur (10).

9. The motor unit (14) for a bicycle derailleur (10) according to claim 7, wherein in a configuration in which the output gear (30) contacts a housing (50) of the motor unit (14), the limitation of the rotatable range of the output gear (30) is electrical.

10. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the output gear (30) is non-circular.

11. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the output gear (30) is a sector gear.

12. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the rotational force of the output shaft (24) is transmitted to a linkage of the bicycle derailleur (10).

13. The motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the bicycle derailleur (10) is a front bicycle derailleur (10B) that includes a base member (16B), a linkage mechanism (20B) and a chain guide (22B).

14. The motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the bicycle derailleur (10) is a rear bicycle derailleur (10A) that includes a base member (16A), a movable member (18A), a linkage mechanism (20A) and a chain guide (22A).

15. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the motor unit (14) is disposed within a base member (16 a,16 b) of the bicycle derailleur (10).

16. The motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the bicycle derailleur (10) includes a power interface (56) configured to be connected to a battery (58), and the power interface (56) is electrically connected to the motor (26).

17. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, further comprising:

-a housing (50), said motor (26), at least a portion of said output shaft (24) and said intermediate gear structure (32) being arranged in said housing (50); and

a wireless communication unit (62), the wireless communication unit (62) being configured to communicate with an additional wireless communication unit (64) provided on an additional bicycle component (66).

18. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, further comprising:

-a controller (60), the controller (60) being configured to calculate an angle of one of the output gear (30) and the output shaft (24) from a detection value of the angle sensor (34).

19. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the angle sensor (34) is a magnetic sensor.

20. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the angle sensor (34) is an optical sensor.

21. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein the encoder (40) is configured to rotate in response to rotation of the motor shaft (36) of the motor (26).

22. A motor unit (14) for a bicycle derailleur (10) according to claim 1 or 3, wherein

The encoder (40) is rotatably arranged on a first shaft (42) of the intermediate gear structure (32);

the output gear (30) is rotatably arranged on a second shaft (44); and is also provided with

The second shaft (44) is adjacent to the first shaft (42) with no other shaft therebetween.