Bicycle motor unit and bicycle derailleur

Abstract

The invention relates to a bicycle motor unit. The bicycle motor unit comprises an electric motor and a transmission structure. The electric motor is configured to generate a driving force. The transmission structure is coupled to the electric motor to transfer driving force from the electric motor to an actuated device of the bicycle. The transmission structure includes a first rotatable member, a second rotatable member, and a resisting structure. The first rotatable member is rotatable about an axis of rotation. The second rotatable member is rotatable relative to the first rotatable member about an axis of rotation. A resisting structure is disposed at least partially radially between the first rotatable member and the second rotatable member relative to the rotational axis to resist relative rotation between the first rotatable member and the second rotatable member.

Description

Technical Field

[0001] The invention relates to a bicycle motor unit and a bicycle transmission. Background Art

[0002] A human-powered vehicle includes a motor device coupled to a movable part to move the movable part. In the case where the movable part receives an external force caused by physical contact between an obstacle and the movable part, an external rotational force is input to the motor device. It is preferred to reduce the influence of the external rotational force on the motor device. Summary of the invention

[0003] According to a first aspect of the present invention, a bicycle motor unit includes an electric motor and a transmission structure. The electric motor is configured to generate a driving force. The transmission structure is coupled to the electric motor to transmit the driving force from the electric motor to an actuated device of the bicycle. The transmission structure includes a first rotatable member, a second rotatable member and a resistance structure. The first rotatable member is capable of rotating around a rotation axis. The second rotatable member is capable of rotating relative to the first rotatable member around the rotation axis. The resistance structure is at least partially radially disposed between the first rotatable member and the second rotatable member relative to the rotation axis to resist relative rotation between the first rotatable member and the second rotatable member.

[0004] With the bicycle motor unit according to the first aspect, the resistance structure provides resistance to the relative rotation between the first rotatable member and the second rotatable member. Therefore, when an external force is applied to at least one of the first rotatable member and the second rotatable member, the resistance structure reduces the rotational force transmitted between the first rotatable member and the second rotatable member. Therefore, it is possible to reduce the influence of the external force on the electric motor.

[0005] In accordance with a second aspect of the present invention, the bicycle motor unit according to the first aspect is configured so that the first rotatable member is radially spaced apart from the second rotatable member with respect to the rotation axis.

[0006] With the bicycle motor unit according to the second aspect, it is possible to utilize the space between the first rotatable member and the second rotatable member.

[0007] In accordance with a third aspect of the present invention, the bicycle motor unit according to the first aspect or the second aspect is configured so that the second rotatable member is at least partially disposed radially inside the first rotatable member with respect to the rotation axis.

[0008] With the bicycle motor unit according to the third aspect, it is possible to utilize the radially inner space of the first rotatable member as a space for at least partially disposing the second rotatable member. Therefore, it is possible to make the transmission structure compact.

[0009] According to a fourth aspect of the present invention, the bicycle motor unit according to any one of the first to third aspects is configured so that the resistance structure includes a resistance member that is a separate member from at least one of the first rotatable member and the second rotatable member.

[0010] With the bicycle motor unit according to the fourth aspect, it is possible to increase the degree of freedom in designing the bicycle motor unit.

[0011] In accordance with a fifth aspect of the present invention, the bicycle motor unit according to the fourth aspect is configured so that the resistance member includes a slidable member configured to slidably contact at least one of the first rotatable member and the second rotatable member.

[0012] With the bicycle motor unit according to the fifth aspect, it is possible to provide resistance using frictional force generated between the slidable member and at least one of the first rotatable member and the second rotatable member.

[0013] In accordance with a sixth aspect of the present invention, the bicycle motor unit according to any one of the first to fifth aspects is configured so that: the first rotatable member includes a first coupling portion coupled to the resistance structure; and the second rotatable member includes a second coupling portion coupled to the resistance structure.

[0014] With the bicycle motor unit according to the sixth aspect, the resistance structure reliably provides resistance against relative rotation between the first rotatable member and the second rotatable member. Therefore, when an external force is applied to at least one of the first rotatable member and the second rotatable member, the resistance structure reliably reduces the rotational force transmitted between the first rotatable member and the second rotatable member. Therefore, it is possible to reliably reduce the influence of the external force on the electric motor.

[0015] In accordance with a seventh aspect of the present invention, the bicycle motor unit according to the sixth aspect is configured so that the second coupling portion is at least partially disposed radially inward of the first coupling portion.

[0016] With the bicycle motor unit according to the seventh aspect, it is possible to utilize the radially inner space of the first coupling portion as a space for at least partially disposing the second coupling portion, thereby making it possible to make the transmission structure more compact.

[0017] In accordance with an eighth aspect of the present invention, the bicycle motor unit according to the sixth aspect is configured so that the second coupling portion is at least partially disposed radially outside of the first coupling portion.

[0018] With the bicycle motor unit according to the eighth aspect, it is possible to utilize the radially outer space of the first coupling portion as a space for at least partially disposing the second coupling portion. Therefore, it is possible to make the transmission structure compact.

[0019] According to a ninth aspect of the present invention, the bicycle motor unit according to any one of the sixth to eighth aspects is configured such that: the first coupling portion includes a first contact surface that can contact the resistance structure. The second coupling portion includes a second contact surface that can contact the resistance structure. The first contact surface is radially spaced apart from the second contact surface relative to the rotation axis.

[0020] With the bicycle motor unit according to the ninth aspect, the resistance structure provides resistance between the first contact surface and the resistance structure and / or between the second contact surface and the resistance structure. Therefore, when an external force is applied to at least one of the first rotatable member and the second rotatable member, the resistance structure reliably reduces the rotational force transmitted between the first rotatable member and the second rotatable member. Therefore, it is possible to reliably reduce the influence of the external force on the electric motor.

[0021] In accordance with a tenth aspect of the present invention, the bicycle motor unit according to any one of the sixth to ninth aspects is configured so that the first rotatable member includes a first protruding portion disposed closer to the second rotatable member than the first coupling portion in a radial direction relative to the rotation axis.

[0022] With the bicycle motor unit according to the tenth aspect, the first protruding portion makes the orientation of the second rotatable member more stable relative to the first rotatable member.

[0023] In accordance with an eleventh aspect of the present invention, the bicycle motor unit according to the tenth aspect is configured so that the first protruding portion at least partially overlaps the resistance structure when viewed along the rotation axis.

[0024] With the bicycle motor unit according to the eleventh aspect, the first protrusion restricts the resistance structure from moving along the rotation axis.

[0025] In accordance with a twelfth aspect of the present invention, the bicycle motor unit according to any one of the sixth to eleventh aspects is configured so that the second rotatable member includes a second protruding portion disposed closer to the first rotatable member than the second coupling portion in a radial direction relative to the rotation axis.

[0026] With the bicycle motor unit according to the twelfth aspect, the second protrusion makes the orientation of the first rotatable member more stable with respect to the second rotatable member.

[0027] In accordance with a thirteenth aspect of the present invention, the bicycle motor unit according to the twelfth aspect is configured so that the second protruding portion at least partially overlaps the resistance structure when viewed along the rotation axis.

[0028] With the bicycle motor unit according to the thirteenth aspect, the second protrusion restricts the resistance structure from moving along the rotation axis.

[0029] In accordance with a fourteenth aspect of the present invention, the bicycle motor unit according to any one of the sixth to thirteenth aspects is configured so that: the second rotatable member includes a radially inner portion, the radially inner portion being disposed radially inward of the second coupling portion relative to the rotation axis. The first coupling portion is at least partially radially disposed between the second coupling portion and the radially inner portion relative to the rotation axis.

[0030] With the bicycle motor unit according to the fourteenth aspect, it is possible to utilize the space between the second coupling portion and the radially inner portion as a space for at least partially disposing the first coupling portion. Therefore, it is possible to make the transmission structure compact.

[0031] In accordance with a fifteenth aspect of the present invention, the bicycle motor unit according to the fourteenth aspect is configured such that: the second rotatable member includes a second extending portion, which extends between the radially inner portion and the second connecting portion so that the second connecting portion can rotate integrally with the radially inner portion around the rotation axis.

[0032] With the bicycle motor unit according to the fifteenth aspect, the second extending portion enables the second coupling portion and the radially inner portion to integrally rotate about the rotation axis.

[0033] In accordance with a sixteenth aspect of the present invention, the bicycle motor unit according to any one of the first to fifteenth aspects is configured such that: the first rotatable member is operatively coupled to the electric motor to receive a driving force from the electric motor. The second rotatable member is configured to receive a driving force from the electric motor via the resistance structure and the first rotatable member.

[0034] With the bicycle motor unit according to the sixteenth aspect, the resistance structure and the first rotatable member transmit the driving force from the electric motor to the second rotatable member. Therefore, it is possible to output the driving force from the second rotatable member.

[0035] According to a seventeenth aspect of the present invention, the bicycle motor unit according to any one of the first to sixteenth aspects is configured so that: the first rotatable member includes a first gear. The first gear is configured to mesh with a first additional gear to receive driving force from the electric motor via the first additional gear.

[0036] With the bicycle motor unit in accordance with the seventeenth aspect, it is possible to transmit the driving force from the electric motor to the first rotatable member via a relatively simple structure such as the first gear and the first additional gear.

[0037] In accordance with an eighteenth aspect of the present invention, the bicycle motor unit according to any one of the first to seventeenth aspects is configured so that the second rotatable member includes a second gear that is configured to mesh with the second additional gear to transmit the driving force to the second additional gear.

[0038] With the bicycle motor unit in accordance with the eighteenth aspect, it is possible to output the driving force from the second rotatable member via a relatively simple structure such as the second gear and the second additional gear.

[0039] In accordance with a nineteenth aspect of the present invention, the bicycle motor unit according to the eighteenth aspect is configured so that: the first rotatable member includes a hole extending along the rotation axis, and the second gear is at least partially disposed in the hole.

[0040] With the bicycle motor unit according to the nineteenth aspect, it is possible to utilize the hole as a space in which the second coupling portion is at least partially disposed. Therefore, it is possible to make the transmission structure compact.

[0041] In accordance with a twentieth aspect of the present invention, the bicycle motor unit according to any one of the sixth to fifteenth aspects is configured such that: the first rotatable member includes a first gear. The first gear is configured to mesh with a first additional gear to receive a driving force from the electric motor via the first additional gear. The first gear is coupled to the first coupling portion.

[0042] With the bicycle motor unit according to the twentieth aspect, it is possible to transmit the driving force from the electric motor to the first rotatable member via a relatively simple structure such as the first gear and the first additional gear.

[0043] In accordance with a twenty-first aspect of the present invention, the bicycle motor unit according to the twentieth aspect is configured so that the first coupling portion extends from the first gear along the rotation axis.

[0044] With the bicycle motor unit according to the twenty-first aspect, it is possible to increase the degree of freedom in designing the first coupling portion and the first gear.

[0045] In accordance with a twenty-second aspect of the present invention, the bicycle motor unit according to the twentieth or twenty-first aspect is configured so that: the second rotatable member includes a second gear. The second gear is configured to mesh with the second additional gear to transmit the driving force to the second additional gear. The second gear is coupled to the second coupling portion.

[0046] With the bicycle motor unit according to the twenty-second aspect, it is possible to transmit the driving force from the electric motor to the second rotatable member via a relatively simple structure such as the second gear and the second additional gear.

[0047] In accordance with a twenty-third aspect of the present invention, the bicycle motor unit according to the twenty-second aspect is configured so that the second coupling portion extends from the second gear along the rotation axis.

[0048] With the bicycle motor unit according to the twenty-third aspect, it is possible to increase the degree of freedom in designing the second coupling portion and the second gear.

[0049] In accordance with a twenty-fourth aspect of the present invention, the bicycle motor unit according to any one of the first to twenty-third aspects is configured so that the transmission structure includes a radial support disposed radially between the first rotatable member and the second rotatable member relative to the rotation axis.

[0050] With the bicycle motor unit according to the twenty-fourth aspect, the radial support makes the first rotatable member and the second rotatable member more stable with respect to the rotation axis.

[0051] In accordance with a twenty-fifth aspect of the present invention, the bicycle motor unit according to the twenty-fourth aspect is configured so that the radial support is a separate member from the first rotatable member and the second rotatable member.

[0052] With the bicycle motor unit according to the twenty-fifth aspect, it is possible to improve design flexibility of at least one of the radial support, the first rotatable member, and the second rotatable member.

[0053] In accordance with a twenty-sixth aspect of the present invention, the bicycle motor unit according to the twenty-fourth or twenty-fifth aspect is configured so that: the radial support can contact at least one of the first rotatable member and the second rotatable member to reduce radial movement of the second rotatable member relative to the first rotatable member.

[0054] With the bicycle motor unit according to the twenty-sixth aspect, the radial support reliably stabilizes the first rotatable member and the second rotatable member with respect to the rotation axis.

[0055] In accordance with a twenty-seventh aspect of the present invention, the bicycle motor unit according to any one of the first to twenty-sixth aspects further comprises a restriction member coupled to at least one of the first rotatable member and the second rotatable member to restrict relative movement between the first rotatable member and the second rotatable member along the rotation axis.

[0056] With the bicycle motor unit according to the twenty-seventh aspect, the restriction member restricts relative movement between the first rotatable member and the second rotatable member along the rotation axis. Therefore, it is possible to further stabilize the relative position between the first rotatable member and the second rotatable member along the rotation axis.

[0057] In accordance with the twenty-eighth aspect of the present invention, the bicycle motor unit according to any one of the first to twenty-seventh aspects is configured such that: the resistance structure allows relative rotation between the first rotatable member and the second rotatable member in response to input of a predetermined rotational force transmitted from at least one of the first rotatable member and the second rotatable member.

[0058] With the bicycle motor unit according to the twenty-eighth aspect, the first rotatable member and the second rotatable member rotate relative to each other in response to the predetermined rotational force. Therefore, it is possible to reduce the predetermined rotational force output from the transmission structure or to restrict the predetermined rotational force from being transmitted between the first rotatable member and the second rotatable member. Therefore, it is possible to reliably reduce the influence of external force on the electric motor.

[0059] In accordance with a twenty-ninth aspect of the present invention, the bicycle motor unit according to any one of the first to twenty-eighth aspects further comprises a housing, wherein the housing comprises an internal space, and the transmission structure is at least partially disposed in the internal space.

[0060] With the bicycle motor unit according to the twenty-ninth aspect, it is possible to at least partially protect the transmission structure.

[0061] In accordance with a 30th aspect of the present invention, the bicycle motor unit according to the 29th aspect is configured so that: the second rotatable member includes a first axial end and a second axial end. The second rotatable member extends along the rotation axis between the first axial end and the second axial end. At least one of the first axial end and the second axial end is rotatably supported by the housing around the rotation axis.

[0062] With the bicycle motor unit according to the thirtieth aspect, it is possible to stabilize the orientation of the second rotatable member.

[0063] According to a thirty-first aspect of the present invention, a bicycle derailleur includes a base member, a chain guide, and the bicycle motor unit according to any one of the first to thirtieth aspects. The chain guide is movably coupled to the base member. The bicycle motor unit is provided to the base member to apply a driving force to the chain guide.

[0064] With the bicycle motor unit according to the thirty-first aspect, it is possible to apply the bicycle motor unit to a bicycle transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The present invention may be better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, whereby a more complete appreciation of the invention and its many attendant advantages may be readily obtained.

[0066] Figure 1 is a side view of a bicycle including a bicycle shifter in accordance with the first embodiment.

[0067] Figure 2 yes Figure 1 A side view of a bicycle transmission of the bicycle is shown.

[0068] Figure 3 yes Figure 2 A side view of a bicycle transmission is shown.

[0069] Figure 4 yes Figure 2 A rear view of a bicycle derailleur is shown.

[0070] Figure 5 yes Figure 2 A top view of a bicycle transmission is shown.

[0071] Figure 6 yes Figure 2 An exploded perspective view of a bicycle derailleur is shown.

[0072] Figure 7 yes Figure 2 A perspective view of the internal structure of a bicycle motor unit of a bicycle transmission is shown.

[0073] Figure 8 yes Figure 2 A perspective view of the internal structure of a bicycle motor unit of a bicycle transmission is shown.

[0074] Fig. 9 yes Figure 2 An exploded perspective view of a transmission structure of a bicycle motor unit of a bicycle transmission is shown.

[0075] Fig.10 It is along Fig.13 A sectional view of the transmission structure cut along line XX.

[0076] Fig.11 It is along Fig.10 A sectional view of the transmission structure taken along line XI-XI.

[0077] Fig.12 yes Fig.10 A side view of the transmission structure shown.

[0078] Fig.13 It is along Fig.10 A sectional view of the transmission structure taken along line XIII-XIII.

[0079] Fig.14 It is along Fig.10 A sectional view of the transmission structure taken along line XIV-XIV.

[0080] Fig.15 yes Figure 6 A cross-sectional view of a bicycle motor unit is shown.

[0081] Fig.16 yes Figure 6 A cross-sectional view of a bicycle motor unit is shown.

[0082] Fig.17 yes Figure 6 A cross-sectional view of the additional transmission arrangement of a bicycle motor unit is shown (neutral position).

[0083] Fig.18 yes Figure 6 shown Figure 2 A cross-sectional view of a bicycle transmission is shown.

[0084] Fig.19 yes Figure 6 A cross-sectional view of an additional transmission arrangement of a bicycle motor unit is shown (first rotational position).

[0085] Fig. 20 yes Figure 6 A cross-sectional view of an additional transmission arrangement of a bicycle motor unit is shown (second rotational position).

[0086] Fig.21 It shows Figure 2 A schematic block diagram of the transmission of rotational force in a bicycle transmission is shown.

[0087] Fig. 22 yes Figure 2 A schematic block diagram of a bicycle transmission is shown.

[0088] Fig.23 yes Figure 2 A schematic block diagram of a bicycle transmission is shown.

[0089] Fig.24 It is along Fig.25 XXIV-XXIV is a cross-sectional view of the transmission structure of the bicycle motor unit according to the second embodiment.

[0090] Fig.25 It is along Fig.24 A sectional view of the transmission structure taken along line XXV-XXV.

[0091] Fig.26 is a cross-sectional view of a transmission structure of a bicycle motor unit in accordance with a variation of the second embodiment.

[0092] Fig. 27 It is along Fig.28 FIG. 2 is a cross-sectional view of the transmission structure of the bicycle motor unit according to the third embodiment taken along line XXVI-XXVI.

[0093] Fig.28 It is along Fig. 27 A sectional view of the transmission structure taken along line XXVIII-XXVIII.

[0094] Fig.29 It is along Fig.30 FIG. 2 is a cross-sectional view of the transmission structure of the bicycle motor unit according to the third embodiment taken along line XXIX-XXIX.

[0095] Fig.30 It is along Fig.29 A cross-sectional view of the transmission structure cut along line XXX-XXX. DETAILED DESCRIPTION

[0096] One or more embodiments will now be described with reference to the drawings, wherein like reference numerals designate corresponding or identical elements throughout the various figures.

[0097] First embodiment

[0098] As in Figure 1 As seen in FIG. 2 , the bicycle 2 includes a bicycle transmission RD according to the first embodiment. The bicycle 2 also includes a body 2A, a seat 2B, a handlebar 2C, an operating device 3, an operating device 4, and a transmission system DT. The operating device 3 and the operating device 4 are configured to be mounted to the handlebar 2C. The transmission system DT includes a crank CR, a front sprocket assembly FS, a rear sprocket assembly RS, a chain C, a bicycle transmission FD, and a bicycle transmission RD. The front sprocket assembly FS is fixed to the crank CR. The rear sprocket assembly RS is rotatably mounted to the body 2A. The chain C engages with the front sprocket assembly FS and the rear sprocket assembly RS. The bicycle transmission RD is mounted to the body 2A and is configured to shift the chain C relative to the plurality of sprockets of the rear sprocket assembly RS to change the gear position. The bicycle transmission FD is configured to shift the chain C relative to the plurality of sprockets of the front sprocket assembly FS.

[0099] In the illustrated embodiment, the bicycle transmission RD is applied to a road bicycle. However, if necessary and / or desired, the bicycle transmission RD can be applied to any type of bicycle, such as a mountain bike, a road bike, a city bike, a cargo bike, a hand bike, and a recumbent bike. In addition, the bicycle transmission RD or a variant thereof can be applied to an electric bicycle (E-bike). An electric bicycle includes an electrically assisted bicycle configured to assist the propulsion of the vehicle with an electric motor 33. The structure of the bicycle transmission RD can be applied to the structure of the bicycle transmission FD.

[0100] The bicycle transmission RD is configured to be operated using the operating device 3. The bicycle transmission FD is configured to be operated using the operating device 4. The bicycle transmission RD is configured to be electrically connected to the operating devices 3 and 4. The bicycle transmission RD is configured to be electrically connected to the bicycle transmission FD.

[0101] In the first embodiment, the bicycle transmission RD is configured to be wirelessly connected to the operating device 3 and the operating device 4. The bicycle transmission RD is configured to be wirelessly connected to the bicycle transmission FD. The bicycle transmission RD can be configured to wirelessly communicate with the bicycle transmission FD via at least one of a bicycle computer, a smart phone, a tablet computer, and a personal computer. The bicycle transmission RD is configured to change the gear position in response to a control signal transmitted from the operating device 3. The bicycle transmission RD is configured to transmit the control signal transmitted from the operating device 4 to the bicycle transmission FD. The bicycle transmission FD is configured to change the gear position via the bicycle transmission RD in response to the control signal transmitted from the operating device 4. Each of the bicycle transmissions RD and FD includes an electric power source such as a battery. However, if necessary and / or desired, at least one of the bicycle transmissions RD and FD can be electrically connected to another electric power source, such as a battery, via a cable. If necessary and / or desired, both the bicycle transmission RD and the bicycle transmission FD can be electrically connected to another electric power source, such as a battery, via a cable.

[0102] In the first embodiment, the bicycle derailleur RD includes a rear derailleur, and the bicycle derailleur FD includes a front derailleur. That is, the bicycle derailleur RD may also be referred to as a bicycle rear derailleur RD. The bicycle derailleur FD may also be referred to as a bicycle front derailleur FD. If needed and / or desired, the structure of the bicycle derailleur RD may be applied to other bicycle components, such as a bicycle derailleur FD.

[0103] In this application, the following directional terms "front", "rear", "forward", "rearward", "left", "right", "lateral", "upward", and "downward", and any other similar directional terms refer to those directions determined based on a user (e.g., a rider) in a standard user position in the bicycle 2 (e.g., on the saddle 2B or seat) facing the handlebars 2C. Therefore, when used to describe the bicycle derailleur RD or other components, these terms should be interpreted as being used relative to the bicycle 2 equipped with the bicycle derailleur RD in an upright riding position on a horizontal plane.

[0104] As in Figure 2 As seen in FIG. 1 , the bicycle derailleur RD includes a base member 12 and a chain guide 14. The base member 12 is configured to be coupled to the vehicle body 2A. The base member 12 is configured to be coupled to the vehicle body 2A using a derailleur fastener 15. The chain guide 14 is movably coupled to the base member 12. The bicycle derailleur RD includes a linkage mechanism 16. The chain guide 14 is movably coupled to the base member 12 via the linkage mechanism 16.

[0105] The base member 12 is pivotally coupled to the vehicle body 2A around the shift fastener 15. The bicycle shifter RD includes an adjustment member 19. The adjustment member 19 is configured to change the orientation of the base member 12 relative to the vehicle body 2A around the shift fastener 15 in a state where the shift fastener 15 is loosened. Examples of the adjustment member 19 include screws. In a state where the base member 12 is in a position adjusted using the adjustment member 19, the shift fastener 15 is tightened to fix the base member 12 to the vehicle body 2A.

[0106] As in Figure 3 As seen in FIG. 1 , the chain guide 14 includes a coupling member 20, a guide plate 22, a guide pulley 24, and a tensioning pulley 26. The coupling member 20 is movably coupled to the base member 12 via the linkage mechanism 16. The guide plate 22 is pivotally coupled to the coupling member 20 about a pivot axis PA. The guide pulley 24 is rotatably coupled to the guide plate 22. The tensioning pulley 26 is rotatably coupled to the guide plate 22. The guide pulley 24 is configured to engage with the chain C. The tensioning pulley 26 is configured to engage with the chain C. The structure of the chain guide 14 is not limited to the above structure. For example, the coupling member 20 can be omitted from the chain guide 14 if needed and / or desired. The chain guide 14 can also be referred to as a movable member 14.

[0107] As in Figure 2As seen in FIG. 1 , the linkage mechanism 16 movably couples the base member 12 and the chain guide 14. The linkage mechanism 16 movably couples the base member 12 and the coupling member 20. In the present embodiment, the linkage mechanism 16 includes an outer link 28 and an inner link 30. The outer link 28 is pivotally coupled to the base member 12 about a first pivot axis A1. The outer link 28 is pivotally coupled to the chain guide 14 (e.g., the coupling member 20) about a second pivot axis A2. The inner link 30 is pivotally coupled to the base member 12 about a third pivot axis A3. The inner link 30 is pivotally coupled to the chain guide 14 (e.g., the coupling member 20) about a fourth pivot axis A4. The first pivot axis A1 to the fourth pivot axis A4 are parallel to each other. However, if necessary and / or desired, one of the outer link 28 and the inner link 30 may be omitted from the linkage mechanism 16. The structure of the linkage mechanism 16 is not limited to the above structure. At least one of the first to fourth pivot axes A1 to A4 may not be parallel to another one of the first to fourth pivot axes A1 to A4.

[0108] As in Figure 4 As seen in FIG. 1 , the inner link 30 is at least partially disposed between the outer link 28 and a transverse center plane CP of the bicycle 2. The transverse center plane CP is defined as a plane perpendicular to the rear sprocket assembly RS (see, e.g., FIG. 1 ). Figure 1 ) of the sprocket rotation axis RA (see e.g. Figure 2 ).

[0109] The bicycle derailleur RD includes a bicycle motor unit 32. The bicycle motor unit 32 includes an electric motor 33. The electric motor 33 is configured to generate a driving force. The driving force includes a driving rotational force RF0. In the present application, the term "rotational force" may also be referred to as "torque" or "moment". The electric motor 33 is configured to generate the driving rotational force RF0. The electric motor 33 is configured to generate the driving rotational force RF0 to actuate an actuated device of the bicycle 2. In the present embodiment, the electric motor 33 is configured to generate the driving rotational force RF0 to move the chain guide 14 relative to the base member 12. However, if needed and / or desired, the electric motor 33 can be configured to actuate another device besides the bicycle derailleur RD.

[0110] The bicycle motor unit 32 is provided to one of the base member 12, the chain guide 14 and the linkage mechanism 16. The electric motor 33 is provided to one of the base member 12, the chain guide 14 and the linkage mechanism 16. In the present embodiment, the bicycle motor unit 32 is provided to the base member 12. The electric motor 33 is provided to the base member 12. However, if needed and / or desired, the bicycle motor unit 32 can be provided to one of the chain guide 14 and the linkage mechanism 16. If needed and / or desired, the electric motor 33 can be provided to one of the chain guide 14 and the linkage mechanism 16.

[0111] The bicycle motor unit 32 is provided to the base member 12 to apply a driving force (e.g., a driving rotational force RF0) to the chain guide 14. The bicycle motor unit 32 is configured to move at least one of the chain guide 14 and the linkage mechanism 16 relative to the base member 12. In the present embodiment, the bicycle motor unit 32 is coupled to the linkage mechanism 16 to move the chain guide 14 via the linkage mechanism 16. However, if needed and / or desired, the bicycle motor unit 32 can be directly coupled to the chain guide 14 to move the chain guide 14 relative to the base member 12.

[0112] As in Figure 2 As seen in the figure, the bicycle transmission RD also includes a power source attachment structure 34 to which an electric power source 36 is attached. The power source attachment structure 34 is configured to detachably hold the electric power source 36. The power source attachment structure 34 is electrically connected to the bicycle motor unit 32 to supply power from the electric power source 36 to the bicycle motor unit 32. Examples of the electric power source 36 include batteries such as primary cells and storage batteries. However, if needed and / or desired, the power source attachment structure 34 can be omitted from the bicycle transmission RD. In such an embodiment, the bicycle transmission RD can be configured to be electrically connected to another electric power source if needed and / or desired.

[0113] As in Figure 5 As seen in FIG. 1 , the power source attachment structure 34 is provided to one of the base member 12, the chain guide 14 and the linkage mechanism 16. The bicycle motor unit 32 is provided to one of the base member 12, the chain guide 14 and the linkage mechanism 16. The power source attachment structure 34 is provided to the other of the base member 12, the chain guide 14 and the linkage mechanism 16. The bicycle motor unit 32 is provided to one of the base member 12 and the linkage mechanism 16. The power source attachment structure 34 is provided to the other of the base member 12 and the linkage mechanism 16.

[0114] In the present embodiment, the bicycle motor unit 32 is provided to the base member 12. The power source attachment structure 34 is provided to the linkage mechanism 16. The power source attachment structure 34 is provided to the outer link 28. However, if needed and / or desired, the bicycle motor unit 32 can be provided to one of the chain guide 14 and the linkage mechanism 16. If needed and / or desired, the bicycle motor unit 32 can be provided to one of the outer link 28 and the inner link 30. If needed and / or desired, the power source attachment structure 34 can be provided to one of the base member 12 and the chain guide 14. If needed and / or desired, the power source attachment structure 34 can be provided to the inner link 30. If needed and / or desired, the power source attachment structure 34 can be omitted from the bicycle motor unit 32.

[0115] The bicycle derailleur RD includes a cover 37. The cover 37 is attached to the base member 12. The cover 37 is fixed to the base member 12 using fasteners 37A such as screws. In a cover-attached state in which the cover 37 is attached to the base member 12, the adjustment member 19 is at least partially disposed outside the cover 37. The cover 37 includes a hole 37B. The adjustment member 19 extends through the hole 37B of the cover 37 in the cover-attached state.

[0116] The base member 12 includes a connection port 12P electrically connected to the cable EC. The cover 37 at least partially covers the connection port 12P in a cover-attached state. The cover 37 at least partially covers the cable EC in a cover-attached state. The bicycle motor unit 32 is configured to be powered by power supplied from the electric power source 36 or by power supplied from an external power source via the cable EC. The cover 37 can be omitted from the bicycle derailleur RD if needed and / or desired.

[0117] As in Figure 6 As seen in the figure, the bicycle motor unit 32 also includes a housing 38 including an interior space 38S. The transmission structure 60 is at least partially disposed in the interior space 38S. In the present embodiment, the housing 38 is a separate component separated from the base member 12. However, the housing 38 can be at least partially integrally provided with the base member 12 as a one-piece unitary component.

[0118] The base member 12 includes a first base body 40, a second base body 42, and a fastener 44. The first base body 40 is configured to be coupled to the vehicle body 2A using the transmission fastener 15 (see, for example, Figure 2 ). The second base body 42 is a separate member from the first base body 40. The second base body 42 is fastened to the first base body 40 using fasteners 44 such as screws. The bicycle motor unit 32 is disposed between the first base body 40 and the second base body 42. The housing 38 is held between the first base body 40 and the second base body 42.

[0119] As in Figure 6 As seen in FIG. 3 , the housing 38 includes a first housing 50 and a second housing 52. The first housing 50 and the second housing 52 define an interior space 38S between the first housing 50 and the second housing 52. In the present embodiment, the second housing 52 is a separate component separated from the first housing 50. However, if necessary and / or desired, the second housing 52 can be integrally provided with the first housing 50 as a one-piece unitary component.

[0120] The electric motor 33 is configured to generate a driving rotational force RF0 (see, for example, Figure 7 The electric motor 33 is electrically connected to the power source attachment structure 34. The electric motor 33 is disposed in the internal space 38S of the housing 38. The electric motor 33 is disposed between the first housing 50 and the second housing 52.

[0121] The bicycle motor unit 32 includes an output member 56. The electric motor 33 is coupled to the output member 56 so that the output member 56 rotates relative to the housing 38 about the output rotation axis A5. The output member 56 extends along the output rotation axis A5. In the present embodiment, the output rotation axis A5 coincides with the third pivot axis A3. The output member 56 can rotate relative to the housing 38 about the third pivot axis A3. The inner link 30 can rotate relative to the base member 12 about the output rotation axis A5. However, if needed and / or desired, the output rotation axis A5 can deviate from the third pivot axis A3.

[0122] The inner link 30 is coupled to the output member 56 to receive the driving rotational force RF0 transmitted from the electric motor 33 to the output member 56. The inner link 30 is coupled to the output member 56 to rotate together with the output member 56 relative to the housing 38 and the base member 12 about the third pivot axis A3. The inner link 30 includes an inner link body 30A, an inner link rod 30B, and a fastener 30C. The inner link body 30A is pivotally coupled to the base member 12 about the third pivot axis A3. The inner link body 30A is pivotally coupled to the chain guide 14 about the fourth pivot axis A4. The inner link rod 30B is fastened to the inner link body 30A with a fastener 30C. The inner link rod 30B is coupled to the output member 56 to receive the driving rotational force RF0 transmitted from the electric motor 33 from the output member 56. The inner link rod 30B is coupled to the output member 56 for rotation with the output member 56 relative to the housing 38 and the base member 12 about the third pivot axis A3 .

[0123] The external force EF is applied to at least one of the chain guide 14 and the linkage mechanism 16 in response to physical contact between the obstacle and at least one of the chain guide 14 and the linkage mechanism 16. Therefore, the external rotational force ERF is applied to the output member 56 via the linkage mechanism 16 in response to the external force EF. It is preferable to restrict the external rotational force ERF from being transmitted from at least one of the chain guide 14 and the linkage mechanism 16 to the electric motor 33.

[0124] As in Figure 7 As seen in FIG. 1 , the bicycle motor unit 32 includes a transmission structure 60. The transmission structure 60 is coupled to the electric motor 33 to transmit the driving force (e.g., the driving rotational force RF0) from the electric motor 33 to an actuated device of the bicycle 2. The transmission structure 60 is coupled to the electric motor 33 to transmit the driving force (e.g., the driving rotational force RF0) from the electric motor 33 to the chain guide 14.

[0125] The transmission structure 60 is coupled to the electric motor 33 to transmit the driving rotational force RF0 from the electric motor 33 to at least one of the chain guide 14 and the linkage mechanism 16. In the present embodiment, the transmission structure 60 is coupled to the electric motor 33 to transmit the driving rotational force RF0 from the electric motor 33 to the chain guide 14 via the linkage mechanism 16. However, the transmission structure 60 may also be configured to transmit the driving rotational force RF0 from the electric motor 33 to the chain guide 14 via the coupling member 20 or directly to the chain guide 114 as needed and / or desired.

[0126] The bicycle motor unit 32 includes an additional transmission structure 62. The transmission structure 60 has a structure different from that of the additional transmission structure 62. The additional transmission structure 62 is coupled to the electric motor 33 to transmit the driving rotational force RF0 from the electric motor 33 to an actuated device of the bicycle 2. The additional transmission structure 62 is coupled to the electric motor 33 to transmit the driving rotational force RF0 from the electric motor 33 to the chain guide 14.

[0127] The additional transmission structure 62 is coupled to the electric motor 33 to transmit the driving rotational force RF0 from the electric motor 33 to at least one of the chain guide 14 and the linkage mechanism 16. In the present embodiment, the additional transmission structure 62 is coupled to the electric motor 33 to transmit the driving rotational force RF0 from the electric motor 33 to the chain guide 14 via the linkage mechanism 16. However, the additional transmission structure 62 may be configured to transmit the driving rotational force RF0 from the electric motor 33 to the chain guide 14 via the coupling member 20 or directly to the chain guide 14 as needed and / or desired.

[0128] The transmission structure 60 is disposed on the downstream side of the additional transmission structure 62 on the power transmission path TP along the first power transmission direction LD1 defined from the electric motor 33 to the output member 56. The transmission structure 60 is disposed on the upstream side of the additional transmission structure 62 on the power transmission path TP along the second power transmission direction LD2 defined from the output member 56 to the electric motor 33.

[0129] The bicycle motor unit 32 also includes a speed reducer 63. The speed reducer 63 couples the electric motor 33 and the output member 56 to transmit the driving rotational force RF0 of the electric motor 33 to the output member 56. In the present embodiment, the speed reducer 63 includes a transmission structure 60 and an additional transmission structure 62. However, if necessary and / or desired, one of the transmission structure 60 and the additional transmission structure 62 can be omitted from the speed reducer 63. If necessary and / or desired, in addition to the transmission structure 60 and the additional transmission structure 62, the speed reducer 63 can also include a structure other than the transmission structure 60 and the additional transmission structure 62.

[0130] The electric motor 33 includes an output shaft 33A. The electric motor 33 includes a motor gear 33B and a motor housing 33C. The motor gear 33B is fastened to the output shaft 33A. The electric motor 33 is configured to rotate the output shaft 33A relative to the motor housing 33C around the motor rotation axis A9. The electric motor 33 is configured to generate a driving rotational force RF0.

[0131] As in Figure 8 As seen in FIG. 1 , the electric motor 33 is coupled to the additional transmission structure 62. The electric motor 33 is coupled to the additional transmission structure 62 via at least one gear. The reducer 63 includes gears G1, G2, G3, G4, and G5. That is, the bicycle motor unit 32 includes gears G1 to G5. The electric motor 33 is coupled to the additional transmission structure 62 via gears G1 to G5. The gear G1 meshes with the motor gear 33B of the electric motor 33. The gear G2 can rotate relative to the housing 38 together with the gear G1 (see, e.g., Fig.16 ). Gear G2 meshes with gear G3. Gear G4 can rotate relative to housing 38 together with gear G3 (see, for example Fig.16 The gear G4 meshes with the gear G5. The additional transmission structure 62 is coupled to the gear G5 to receive the driving rotational force RF0 generated by the electric motor 33 via the gears G1 to G5.

[0132] The additional transmission structure 62 is coupled to the transmission structure 60. The additional transmission structure 62 is coupled to the transmission structure 60 via at least one gear. The reducer 63 includes a gear G6. The gear G6 is coupled to the additional transmission structure 62 to receive the rotational force from the additional transmission structure 62. The transmission structure 60 includes a gear G7. The gear G7 meshes with the gear G6. The additional transmission structure 62 is coupled to the transmission structure 60 via the gears G6 and G7. The gear G7 may also be referred to as a first gear G7. The gear G6 may also be referred to as a first additional gear G6.

[0133] As in Figure 7 As seen in FIG. 6 , the transmission structure 60 includes a gear G8. The output member 56 includes a shaft 56S and an output gear G9. The shaft 56S extends along the output rotation axis A5. The output gear G9 is coupled to the shaft 56S to rotate with the shaft 56S around the output rotation axis A5. The gear G8 meshes with the output gear G9. The gear G8 may also be referred to as a second gear G8. The output gear G9 may also be referred to as a second additional gear G9.

[0134] The transmission structure 60 is configured to protect the electric motor 33 from damage caused by the external force EF while allowing the drive rotational force RF0 to be transmitted from the electric motor 33 to at least one of the chain guide 14 and the linkage mechanism 16. The transmission structure 60 is configured to limit the force transmission from one of the chain guide 14 and the linkage mechanism 16 to the electric motor 33. The transmission structure 60 is configured to reduce the force transmission from one of the chain guide 14 and the linkage mechanism 16 to the electric motor 33.

[0135] The additional transmission structure 62 is configured to protect the electric motor 33 from damage caused by the external force EF while allowing the driving rotational force RF0 to be transmitted from the electric motor 33 to at least one of the chain guide 14 and the linkage mechanism 16. The additional transmission structure 62 is configured to limit the force transmission from one of the chain guide 14 and the linkage mechanism 16 to the electric motor 33. The additional transmission structure 62 is configured to reduce the force transmission from one of the chain guide 14 and the linkage mechanism 16 to the electric motor 33.

[0136] In the power transmission path TP provided from the electric motor 33 to the output member 56, the transmission structure 60 and the additional transmission structure 62 are provided between the electric motor 33 and the output member 56. On the power transmission path TP provided from the electric motor 33 to the output member 56, the additional transmission structure 62 is provided between the electric motor 33 and the transmission structure 60. On the power transmission path TP, the transmission structure 60 is provided between the additional transmission structure 62 and the output member 56. The power transmission path TP is defined from the electric motor 33 through the additional transmission structure 62 and the transmission structure 60 to the output member 56.

[0137] The transmission structure 60 is configured to limit force transmission from one of the chain guide 14 and the linkage mechanism 16 to the additional transmission structure 62. The transmission structure 60 is configured to reduce force transmission from one of the chain guide 14 and the linkage mechanism 16 to the additional transmission structure 62. The additional transmission structure 62 is configured to limit force transmission from the transmission structure 60 to the electric motor 33. The additional transmission structure 62 is configured to reduce force transmission from the transmission structure 60 to the electric motor 33.

[0138] As in Fig. 9 As seen in FIG. 6 , the transmission structure 60 includes a first rotatable member 64, a second rotatable member 66, and a resistance structure 68. The first rotatable member 64 is rotatable about a rotation axis A6. The second rotatable member 66 is rotatable about the rotation axis A6 relative to the first rotatable member 64. Fig. 9 In FIG. 6 , the shape of the resistance structure 68 is simplified.

[0139] As in Fig.10 As can be seen in FIG. 1 , the resistance structure 68 is at least partially radially disposed between the first rotatable member 64 and the second rotatable member 66 relative to the rotation axis A6 to resist relative rotation between the first rotatable member 64 and the second rotatable member 66. In the present embodiment, the resistance structure 68 is completely radially disposed between the first rotatable member 64 and the second rotatable member 66 relative to the rotation axis A6 to resist relative rotation between the first rotatable member 64 and the second rotatable member 66. However, if needed and / or desired, the resistance structure 68 may also be partially radially disposed between the first rotatable member 64 and the second rotatable member 66 relative to the rotation axis A6 to resist relative rotation between the first rotatable member 64 and the second rotatable member 66.

[0140] The first rotatable member 64 is radially spaced apart from the second rotatable member 66 relative to the rotation axis A6. The second rotatable member 66 is at least partially disposed radially inwardly of the first rotatable member 64 relative to the rotation axis A6. In the present embodiment, the second rotatable member 66 is partially disposed radially inwardly of the first rotatable member 64 relative to the rotation axis A6. However, if needed and / or desired, the second rotatable member 66 can be completely disposed radially inwardly of the first rotatable member 64 relative to the rotation axis A6. If needed and / or desired, the first rotatable member 64 can be at least partially disposed radially inwardly of the second rotatable member 66 relative to the rotation axis A6.

[0141] The resistance structure 68 includes a resistance member 70. The resistance member 70 is a separate member separate from at least one of the first rotatable member 64 and the second rotatable member 66. In the present embodiment, the resistance member 70 is a separate member separate from at least one of the first rotatable member 64 and the second rotatable member 66. However, if needed and / or desired, the resistance member 70 can be integrally provided as a one-piece unitary member with at least one of the first rotatable member 64 and the second rotatable member 66. If needed and / or desired, the resistance structure 68 can be integrally provided as a one-piece unitary member with at least one of the first rotatable member 64 and the second rotatable member 66.

[0142] The resistance member 70 includes a slidable member 72. The slidable member 72 is configured to slidably contact at least one of the first rotatable member 64 and the second rotatable member 66. The slidable member 72 is radially deformable relative to the rotation axis A6. The slidable member 72 is radially deformable between the first rotatable member 64 and the second rotatable member 66. If needed and / or desired, the slidable member 72 can be integrally provided with one of the first rotatable member 64 and the second rotatable member 66 as a one-piece unitary member.

[0143] As in Fig.11 As seen in FIG. 6 , the slidable member 72 extends circumferentially about the rotation axis A6 . The slidable member 72 is configured to slidably contact both the first rotatable member 64 and the second rotatable member 66 .

[0144] The slidable member 72 includes a base portion 72A and at least two slidable portions 72B. The base portion 72A slidably contacts the first rotatable member 64. The at least two slidable portions 72B slidably contact the second rotatable member 66. The base portion 72A extends circumferentially around the rotation axis A6. For example, the base portion 72A has an arc shape. The at least two slidable portions 72B radially protrude from the base portion 72A toward one of the first rotatable member 64 and the second rotatable member 66. The at least two slidable portions 72B radially protrude inwardly from the base portion 72A toward the second rotatable member 66. The at least two slidable portions 72B can be elastically deformed in a radial direction relative to the rotation axis A6.

[0145] However, if needed and / or desired, at least two slidable portions 72B can be arranged to protrude radially outward from the base portion 72A toward the first rotatable member 64. The base portion 72A can be configured to slidably contact the second rotatable member 66 as needed and / or desired. The at least two slidable portions 72B can be configured to slidably contact the first rotatable member 64 as needed and / or desired. The total number of at least two slidable portions 72B is not limited to nine. If needed and / or desired, the resistance member 70 may include a member other than the slidable member 72 instead of or in addition to the slidable member 72. If needed and / or desired, the base portion 72A may have other shapes, such as an annular shape.

[0146] The resistance member 70 includes a first circumferential end 70A and a second circumferential end 70B and extends between the first circumferential end 70A and the second circumferential end 70B. The slidable member 72 includes a first circumferential end 70A and a second circumferential end 70B. The base portion 72A includes a first circumferential end 70A and a second circumferential end 70B. In the present embodiment, the first circumferential end 70A is circumferentially spaced from the second circumferential end 70B around the rotation axis A6. However, if necessary and / or desired, the first circumferential end 70A can be integrally connected to the second circumferential end 70B to form a closed loop.

[0147] The at least two slidable parts 72B are integrally provided with the base part 72A as a one-piece integral member. The slidable member 72 is formed by press working. However, if necessary and / or desired, at least one of the at least two slidable parts 72B can be a separate part separated from the base part 72A.

[0148] As in Fig.10 As seen in FIG. 6 , the first rotatable member 64 includes a first coupling portion 74 coupled to the resistance structure 68. The second rotatable member 66 includes a second coupling portion 76 coupled to the resistance structure 68. The second coupling portion 76 is at least partially disposed radially inwardly of the first coupling portion 74. The first coupling portion 74 has a tubular shape. The first rotatable member 64 includes a hole 64H. The hole 64H extends along the rotation axis A6. The first coupling portion 74 includes the hole 64H. The second coupling portion 76 is at least partially disposed in the hole 64H.

[0149] In the present embodiment, the second coupling portion 76 is completely disposed radially inwardly of the first coupling portion 74. The second coupling portion 76 is completely disposed in the hole 64H. However, if needed and / or desired, the second coupling portion 76 can be partially disposed radially inwardly of the first coupling portion 74. If needed and / or desired, the second coupling portion 76 can be partially disposed in the hole 64H. If needed and / or desired, the first coupling portion 74 can be at least partially disposed radially inwardly of the second coupling portion 76.

[0150] The first coupling portion 74 may also be referred to as a first adjacent portion 74 or a first contact portion 74. The second coupling portion 76 may also be referred to as a second adjacent portion 76 or a second contact portion 76.

[0151] As in Fig.12 As seen in FIG, when viewed in a radial direction relative to the rotation axis A6, the resistance structure 68 at least partially overlaps with at least one of the first coupling portion 74 and the second coupling portion 76. In the present embodiment, the resistance structure 68 completely overlaps with the first coupling portion 74 when viewed in a radial direction relative to the rotation axis A6. The resistance structure 68 partially overlaps with the second coupling portion 76 when viewed in a radial direction relative to the rotation axis A6. However, if needed and / or desired, the resistance structure 68 can be arranged to partially overlap with the first coupling portion 74 when viewed in a radial direction relative to the rotation axis A6. If needed and / or desired, the resistance structure 68 can be arranged to partially overlap with the second coupling portion 76 when viewed in a radial direction relative to the rotation axis A6.

[0152] As in Fig.10 As seen in the figure, the first rotatable member 64 is operably coupled to the electric motor 33 to receive a driving force (e.g., a driving rotational force RF0) from the electric motor 33. The second rotatable member 66 is configured to receive a driving force (e.g., a driving rotational force RF0) from the electric motor 33 via the resistance structure 68 and the first rotatable member 64. However, if necessary and / or desired, the second rotatable member 66 can be operably coupled to the electric motor 33 to receive a driving force (e.g., a driving rotational force RF0) from the electric motor 33. If necessary and / or desired, the first rotatable member 64 is configured to receive a driving force (e.g., a driving rotational force RF0) from the electric motor 33 via the resistance structure 68 and the second rotatable member 66.

[0153] As in Figure 7As seen in FIG. 1 , the first rotatable member 64 includes a first gear G7. The second rotatable member 66 includes a second gear G8. The first gear G7 is configured to mesh with the first additional gear G6 to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33 via the first additional gear G6. The second gear G8 is configured to mesh with the second additional gear G9 to transmit the driving force (e.g., driving rotational force RF0) to the second additional gear G9. The first gear G7 is configured to mesh with the first additional gear G6 to receive the driving rotational force RF0 from the electric motor 33 via the first additional gear G6. The second gear G8 is configured to mesh with the second additional gear G9 to transmit the driving rotational force RF0 to the second additional gear G9.

[0154] As in Fig.10 As seen in FIG. 1 , the first gear G7 is coupled to the first coupling portion 74. The first coupling portion 74 extends from the first gear G7 along the rotation axis A6. The first gear G7 radially protrudes from the first coupling portion 74 relative to the rotation axis A6. The first gear G7 protrudes radially outward from the first coupling portion 74 relative to the rotation axis A6. In the present embodiment, the first gear G7 is integrally provided with the first coupling portion 74 as a one-piece, unitary component. However, if needed and / or desired, the first gear G7 can be a separate component separated from the first coupling portion 74.

[0155] The second gear G8 is coupled to the second coupling portion 76. The second coupling portion 76 extends from the second gear G8 along the rotation axis A6. The second gear G8 extends from the second coupling portion 76 along the rotation axis A6. In the present embodiment, the second gear G8 is integrally provided with the second coupling portion 76 as a one-piece unitary member. However, if necessary and / or desired, the second gear G8 can be a separate member separated from the second coupling portion 76.

[0156] As in Fig.10 As seen in FIG. 1 , the first rotatable member 64 includes a first protruding portion 64P. The first protruding portion 64P is disposed relative to the rotation axis A6 to be radially closer to the second rotatable member 66 than the first coupling portion 74. The first protruding portion 64P radially protrudes from the first coupling portion 74 toward the second rotatable member 66 relative to the rotation axis A6. Grease may be provided between the first protruding portion 64P and the second rotatable member 66. Grease may be provided between the first protruding portion 64P and the second gear G8.

[0157] In the present embodiment, the first protrusion 64P is disposed relative to the rotation axis A6 so as to be closer to the second rotatable member 66 radially inward than the first coupling portion 74. The first protrusion 64P is disposed relative to the rotation axis A6 so as to be closer to the second gear G8 radially inward than the first coupling portion 74. The first protrusion 64P protrudes radially inward from the first coupling portion 74 toward the second rotatable member 66 relative to the rotation axis A6. The first protrusion 64P protrudes radially inward from the first coupling portion 74 toward the second gear G8 relative to the rotation axis A6. The first protrusion 64P has an annular shape.

[0158] However, if needed and / or desired, the first protrusion 64P can be disposed radially outwardly closer to the second rotatable member 66 relative to the rotation axis A6 than the first coupling portion 74. If needed and / or desired, the first protrusion 64P can be arranged to protrude radially outwardly from the first coupling portion 74 toward the second rotatable member 66 relative to the rotation axis A6. If needed and / or desired, the first protrusion 64P can be disposed radially outwardly of the first contact surface 74A. If needed and / or desired, the first protrusion 64P can have a shape other than an annular shape.

[0159] In the present embodiment, the first protrusion 64P is integrally provided with the first coupling portion 74 and the first gear G7. However, if needed and / or desired, the first protrusion 64P may be a separate member from at least one of the first coupling portion 74 and the first gear G7.

[0160] The hole 64H includes a first hole 64H1 and a second hole 64H2. The first coupling portion 74 defines the first hole 64H1. The first protrusion 64P defines the second hole 64H2. The first hole 64H1 has a first inner diameter DM31. The second hole 64H2 has a second inner diameter DS32. The second inner diameter DS32 is smaller than the first inner diameter DM31. However, if necessary and / or desired, the second inner diameter DS32 may be greater than or equal to the first inner diameter DM31.

[0161] The second gear G8 is at least partially disposed in the hole 64H. The second gear G8 is at least partially disposed in the second hole 64H2. In the present embodiment, the second gear G8 is partially disposed in the hole 64H. The second gear G8 is partially disposed in the second hole 64H2. However, if necessary and / or desired, the second gear G8 can be completely disposed in the hole 64H. If necessary and / or desired, the second gear G8 can be completely disposed in at least one of the first hole 64H1 and the second hole 64H2.

[0162] As in Fig.11As seen in FIG. 1 , the first coupling portion 74 includes a first contact surface 74A that can contact the resistance structure 68. The second coupling portion 76 includes a second contact surface 76A that can contact the resistance structure 68. The first contact surface 74A at least partially defines the hole 64H. The first contact surface 74A at least partially defines the first hole 64H1. The first contact surface 74A extends circumferentially around the rotation axis A6. The second contact surface 76A extends circumferentially around the rotation axis A6. The first contact surface 74A radially faces the second contact surface 76A. The second contact surface 76A radially faces the first contact surface 74A.

[0163] The first contact surface 74A is radially spaced apart from the second contact surface 76A relative to the rotation axis A6. In the present embodiment, the first contact surface 74A is disposed radially outwardly of the second contact surface 76A relative to the rotation axis A6. However, if necessary and / or desired, the first contact surface 74A may be disposed radially inwardly of the second contact surface 76A relative to the rotation axis A6.

[0164] As in Fig.10 As seen in FIG. 1 , the second rotatable member 66 includes a second protruding portion 66P. The second protruding portion 66P is disposed radially closer to the first rotatable member 64 than the second coupling portion 76 relative to the rotation axis A6. The second protruding portion 66P radially protrudes from the second coupling portion 76 toward the first rotatable member 64 relative to the rotation axis A6.

[0165] In the present embodiment, the second protrusion 66P is disposed radially inwardly closer to the first rotatable member 64 than the second coupling portion 76 relative to the rotation axis A6. The second protrusion 66P is disposed radially inwardly closer to the first coupling portion 74 than the second coupling portion 76 relative to the rotation axis A6. The second protrusion 66P protrudes radially inwardly from the second coupling portion 76 toward the first rotatable member 64 relative to the rotation axis A6. The second protrusion 66P protrudes radially inwardly from the second coupling portion 76 toward the first coupling portion 74 relative to the rotation axis A6. The second protrusion 66P is disposed radially inwardly of the second contact surface 76A. The second protrusion 66P has an annular shape.

[0166] However, if needed and / or desired, the second protrusion 66P is disposed radially outwardly closer to the first rotatable member 64 relative to the rotation axis A6 than the second coupling portion 76. If needed and / or desired, the second protrusion 66P can be arranged to protrude radially outwardly from the second coupling portion 76 toward the first rotatable member 64 relative to the rotation axis A6. If needed and / or desired, the second protrusion 66P can be disposed radially outwardly of the second contact surface 76A. If needed and / or desired, the second protrusion 66P can have any shape other than an annular shape.

[0167] A first distance DS3 is radially defined between the first protrusion 64P and the second gear G8. A second distance DS4 is radially defined between the second protrusion 66P and the first coupling portion 74. A third distance DS5 is radially defined between the first coupling portion 74 and the second coupling portion 76. In the present embodiment, each of the first distance DS3 and the second distance DS4 is shorter than the third distance DS5. However, if necessary and / or desired, at least one of the first distance DS3 and the second distance DS4 may be longer than or equal to the third distance DS5. If necessary and / or desired, the first protrusion 64P may be omitted from the first rotatable member 64. If necessary and / or desired, the second protrusion 66P may be omitted from the second rotatable member 66. At least one of the first distance DS3 and the second distance DS4 may be zero.

[0168] As in Fig.13 As seen in FIG. 6 , when viewed along the rotation axis A6, the first protrusion 64P at least partially overlaps the resistance structure 68. In the present embodiment, when viewed along the rotation axis A6, the first protrusion 64P completely overlaps the resistance structure 68. However, if needed and / or desired, the first protrusion 64P can be arranged to partially overlap the resistance structure 68.

[0169] As in Fig.14 As seen in the figure, when viewed along the rotation axis A6, the second protrusion 66P at least partially overlaps the resistance structure 68. In the present embodiment, when viewed along the rotation axis A6, the second protrusion 66P partially overlaps the resistance structure 68. However, if needed and / or desired, the second protrusion 66P can be arranged to completely overlap the resistance structure 68 when viewed along the rotation axis A6.

[0170] As in Fig.15As seen in FIG. 1 , the second rotatable member 66 includes a first axial end 66A and a second axial end 66B. The second rotatable member 66 extends between the first axial end 66A and the second axial end 66B along the rotation axis A6. The second gear G8 and the second coupling portion 76 are disposed between the first axial end 66A and the second axial end 66B.

[0171] At least one of the first axial end 66A and the second axial end 66B is rotatably supported by the housing 38 about the rotation axis A6. Each of the first axial end 66A and the second axial end 66B is rotatably supported by the housing 38 about the rotation axis A6.

[0172] The bicycle motor unit 32 includes a first support BR1 and a second support BR2. The housing 38 includes a third housing 78. The third housing 78 is disposed in the interior space 38S. The third housing 78 is fixed to the first housing 50 and the second housing 52. The first support BR1 is attached to the third housing 78. The second support BR2 is attached to the second housing 52. The first support BR1 rotatably supports the first axial end 66A around the rotation axis A6. The second support BR2 rotatably supports the second axial end 66B around the rotation axis A6.

[0173] In the present embodiment, the first support BR1 includes a sleeve. The second support BR2 includes a sleeve. However, the structure of each of the first support BR1 and the second support BR2 is not limited to the illustrated embodiment.

[0174] As in Fig.10 As seen in FIG. 1 , the resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66 in response to input of a predetermined rotational force RF1 and / or RF2 transmitted from at least one of the first rotatable member 64 and the second rotatable member 66. In the present embodiment, the resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66 in response to input of a predetermined rotational force RF1 transmitted from the first rotatable member 64. The resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66 in response to input of a predetermined rotational force RF2 transmitted from the first rotatable member 64. The resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66 in response to input of a predetermined rotational force RF1 transmitted from the first rotatable member 64 and / or input of a predetermined rotational force RF2 transmitted from the first rotatable member 64.

[0175] The predetermined rotational force RF1 is a rotational force greater than the rotational force threshold TR. The predetermined rotational force RF2 is a rotational force greater than the rotational force threshold TR. Therefore, when the input rotational force RF3 applied to at least one of the first rotatable member 64 and the second rotatable member 66 is greater than the rotational force threshold TR, the resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66.

[0176] As in Fig.11 As seen in FIG. 1 , the first friction force FF1 is applied between the first rotatable member 64 and the resisting structure 68. The first friction force FF1 is applied to the first contact surface 74A. The first contact surface 74A has a first radius R1 defined from the rotation axis A6. The rotation force threshold TR can be defined as the product obtained by multiplying the first friction force FF1 by the first radius R1.

[0177] The second friction force FF2 is applied between the second rotatable member 66 and the resistance structure 68. The second friction force FF2 is applied to the second contact surface 76A. The second contact surface 76A has a second radius R2 defined from the rotation axis A6. The rotation force threshold TR can be defined as the product obtained by multiplying the second friction force FF2 by the second radius R2.

[0178] As in Fig.10 As seen in FIG. 6 , the resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66 in response to input of a predetermined rotational force RF1 transmitted from the first rotatable member 64. In the case where the input rotational force RF31 applied to the first rotatable member 64 is greater than the rotational force threshold TR, the resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66. In the present embodiment, the slidable member 72 slides along at least one of the first contact surface 74A and the second contact surface 76A in response to input of the predetermined rotational force RF1 transmitted from the first rotatable member 64. Therefore, in the case where the input rotational force RF31 applied to the first rotatable member 64 is greater than the rotational force threshold TR, the first rotatable member 64 rotates relative to the second rotatable member 66.

[0179] While the slidable member 72 slides along at least one of the first contact surface 74A and the second contact surface 76A in response to the input of the predetermined rotational force RF1 transmitted from the first rotatable member 64, the second rotatable member 66 transmits the output rotational force RF41 to the gear G9. The output rotational force RF41 is less than or equal to the predetermined rotational force RF1. That is, the output rotational force RF41 is less than or equal to the rotational force threshold TR. Therefore, when the predetermined rotational force RF1 is applied to the first rotatable member 64, the resistance structure 68 reduces the predetermined rotational force RF1 to the output rotational force RF41.

[0180] In the case where the input rotational force RF31 applied to the first rotatable member 64 is less than or equal to the rotational force threshold value TR, the resistance structure 68 restricts the relative rotation between the first rotatable member 64 and the second rotatable member 66. In the present embodiment, in the case where the input rotational force RF31 applied to the first rotatable member 64 is less than or equal to the rotational force threshold value TR, the slidable member 72 does not slide along at least one of the first contact surface 74A and the second contact surface 76A. Therefore, in the case where the input rotational force RF31 is less than or equal to the rotational force threshold value TR, the second rotatable member 66 transmits the output rotational force RF51 equal to the input rotational force RF31 to the gear G9.

[0181] As in Fig.11 As seen in FIG. 6 , the resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66 in response to input of a predetermined rotational force RF2 transmitted from the first rotatable member 64. In the case where the input rotational force RF32 applied to the first rotatable member 64 is greater than the rotational force threshold TR, the resistance structure 68 allows relative rotation between the first rotatable member 64 and the second rotatable member 66. In the present embodiment, the slidable member 72 slides along at least one of the first contact surface 74A and the second contact surface 76A in response to input of a predetermined rotational force RF2 transmitted from the first rotatable member 64. Therefore, in the case where the input rotational force RF32 applied to the first rotatable member 64 is greater than the rotational force threshold TR, the first rotatable member 64 rotates relative to the second rotatable member 66.

[0182] While the slidable member 72 slides along at least one of the first contact surface 74A and the second contact surface 76A in response to the input of the predetermined rotational force RF2 transmitted from the second rotatable member 66, the first rotatable member 64 transmits the output rotational force RF42 to the gear G6. The output rotational force RF42 is less than or equal to the predetermined rotational force RF2. That is, the output rotational force RF42 is less than or equal to the rotational force threshold TR. Therefore, when the predetermined rotational force RF2 is applied to the first rotatable member 64, the resistance structure 68 reduces the predetermined rotational force RF2 to the output rotational force RF42.

[0183] When the input rotational force RF32 applied to the second rotatable member 66 is less than or equal to the rotational force threshold value TR, the resistance structure 68 limits the relative rotation between the first rotatable member 64 and the second rotatable member 66. In the present embodiment, when the input rotational force RF32 applied to the first rotatable member 64 is less than or equal to the rotational force threshold value TR, the slidable member 72 does not slide along at least one of the first contact surface 74A and the second contact surface 76A. Therefore, when the input rotational force RF32 is less than or equal to the rotational force threshold value TR, the second rotatable member 66 transmits the output rotational force RF52 equal to the input rotational force RF32 to the gear G6.

[0184] As in Figure 7 As seen in FIG. 1 , the additional transmission structure 62 has a transmission structure rotation axis A7. In this embodiment, the rotation axis A6 does not coincide with the transmission structure rotation axis A7. The rotation axis A6 is offset relative to the transmission structure rotation axis A7. The rotation axis A6 is parallel to the transmission structure rotation axis A7. However, if needed and / or desired, the rotation axis A6 may not be parallel to the transmission structure rotation axis A7. If needed and / or desired, the rotation axis A6 may coincide with the transmission structure rotation axis A7.

[0185] As in Fig.16 As seen in FIG. 1 , the additional transmission structure 62 includes a first race 80 and a second race 81. The first race 80 is fixed to the housing 38. The second race 81 extends along the transmission structure rotation axis A7. The second race 81 can rotate around the transmission structure rotation axis A7 relative to the first race 80. The first race 80 is at least partially disposed radially outside the second race 81. The second race 81 is at least partially disposed radially inside the first race 80.

[0186] The first race 80 includes an outer race 83 having an annular shape. The second race 81 includes an inner race 81A. The inner race 81A is at least partially disposed radially inward of the outer race 83. The first race 80 includes a hole 80H. The second race 81 extends through the hole 80H along the transmission structure rotation axis A7. The second race 81 includes a rod 81B. The rod 81B extends from the inner race 81A along the transmission structure rotation axis A7. The rod 81B extends through the hole 80H of the first race 80 along the transmission structure rotation axis A7.

[0187] The additional transmission structure 62 includes a first intermediate element 84. The first intermediate element 84 is at least partially disposed between the first race 80 and the second race 81. In the present embodiment, the first intermediate element 84 is completely disposed between the first race 80 and the second race 81. However, if needed and / or desired, the first intermediate element 84 can be partially disposed between the first race 80 and the second race 81.

[0188] As in Fig.17 As seen in FIG. 1 , the first intermediate element 84 includes a first rotatable portion 84A and a second rotatable portion 84B. In the present embodiment, the first intermediate element 84 includes at least two first rotatable portions 84A and at least two second rotatable portions 84B. The total number of the first rotatable portions 84A is six. The total number of the second rotatable portions 84B is six. The first rotatable portion 84A has a cylindrical shape. The second rotatable portion 84B has a cylindrical shape.

[0189] However, the total number of the first rotatable parts 84A is not limited to six. The total number of the second rotatable parts 84B is not limited to six. The structure of the first intermediate element 84 is not limited to the first rotatable part 84A and the second rotatable part 84B. If necessary and / or desired, one of the first rotatable part 84A and the second rotatable part 84B can be omitted from the first intermediate element 84. If necessary and / or desired, the first rotatable part 84A can have a shape other than a cylindrical shape. If necessary and / or desired, the second rotatable part 84B can have a shape other than a cylindrical shape.

[0190] The first rotatable portion 84A is at least partially disposed between the first race 80 and the second race 81. The second rotatable portion 84B is at least partially disposed between the first race 80 and the second race 81. In the present embodiment, the first rotatable portion 84A is completely disposed between the first race 80 and the second race 81. The second rotatable portion 84B is completely disposed between the first race 80 and the second race 81. However, if needed and / or desired, the first rotatable portion 84A can be partially disposed between the first race 80 and the second race 81. If needed and / or desired, the second rotatable portion 84B can be partially disposed between the first race 80 and the second race 81.

[0191] The first rotatable parts 84A and the second rotatable parts 84B are alternately arranged along the circumferential direction D3 around the transmission structure rotation axis A7. The first rotatable parts 84A and the second rotatable parts 84B are spaced apart from each other along the circumferential direction D3.

[0192] The first race 80 includes an inner circumferential surface 80A. The second race 81 includes at least two contact surfaces 81C. The total number of contact surfaces 81C is six. The contact surface 81C includes a flat surface. However, the total number of contact surfaces 81C is not limited to six. If necessary and / or desired, the contact surface 81C may have a shape other than a flat surface.

[0193] The first and second rotatable portions 84A and 84B are disposed between the inner circumferential surface 80A of the first race 80 and the contact surface 81C of the second race 81. The first and second rotatable portions 84A and 84B may contact the inner circumferential surface 80A of the first race 80 and the contact surface 81C of the second race 81.

[0194] The first intermediate element 84 includes at least one intermediate member group 84G consisting of a first rotatable portion 84A and a second rotatable portion 84B. In the present embodiment, the first intermediate element 84 includes six intermediate member groups 84G each consisting of the first rotatable portion 84A and the second rotatable portion 84B. The intermediate member group 84G is at least partially disposed between the inner circumferential surface 80A of the first race 80 and the contact surface 81C of the second race 81. The intermediate member groups 84G are spaced apart from each other along the circumferential direction D3. The intermediate member groups 84G correspond to the contact surfaces 81C of the second race 81, respectively. However, the total number of the intermediate member groups 84G consisting of the first rotatable portion 84A and the second rotatable portion 84B is not limited to six.

[0195] The additional transmission structure 62 includes at least one biasing element 85. The biasing element 85 is configured to bias the first rotatable part 84A and the second rotatable part 84B to move away from each other. In the present embodiment, the additional transmission structure 62 includes at least two biasing elements 85. The biasing element 85 is arranged between the first rotatable part 84A and the second rotatable part 84B of the intermediate member group 84G to bias the first rotatable part 84A and the second rotatable part 84B to move away from each other. The total number of biasing elements 85 is six. The biasing element 85 includes a spring, such as a coil spring and a leaf spring. However, if necessary and / or desired, the biasing element 85 may include a member other than a spring (e.g., an elastic member such as rubber). The total number of biasing elements 85 is not limited to six.

[0196] The contact surface 81C of the second race 81 includes a first circumferential end 81C1 and a second circumferential end 81C2. The contact surface 81C extends between the first circumferential end 81C1 and the second circumferential end 81C2. The first circumferential end 81C1 is closer to the first rotatable part 84A than the second circumferential end 81C2. The second circumferential end 81C2 is closer to the second rotatable part 84B than the first circumferential end 81C1.

[0197] The first radial distance DS1 is radially defined between the inner circumferential surface 80A of the first race 80 and the first circumferential end 81C1 of the contact surface 81C of the second race 81. The second radial distance DS2 is radially defined between the inner circumferential surface 80A of the first race 80 and the second circumferential end 81C2 of the contact surface 81C of the second race 81. The first rotatable portion 84A has a first diameter DM1. The second rotatable portion 84B has a second diameter DM2. The first radial distance DS1 is shorter than the first diameter DM1. The second radial distance DS2 is shorter than the second diameter DM2.

[0198] The biasing element 85 biases the first rotatable portion 84A so that the first rotatable portion 84A is kept in contact with the inner circumferential surface 80A of the first race 80 and the contact surface 81C of the second race 81 due to the biasing force of the biasing element 85. The biasing element 85 biases the second rotatable portion 84B so that the second rotatable portion 84B is kept in contact with the inner circumferential surface 80A of the first race 80 and the contact surface 81C of the second race 81 due to the biasing force of the biasing element 85.

[0199] As in Fig.18 As can be seen in FIG. 6 , the additional transmission structure 62 includes a second intermediate element 86. The second intermediate element 86 is at least partially disposed between the first race 80 and the second race 81. In the present embodiment, the second intermediate element 86 is partially disposed between the first race 80 and the second race 81. However, the second intermediate element 86 may be completely disposed between the first race 80 and the second race 81.

[0200] The second intermediate element 86 is rotatable relative to the first race 80 about the transmission structure rotation axis A7. The second intermediate element 86 includes a shaft 88. The shaft 88 extends along the transmission structure rotation axis A7. The second race 81 includes a bearing hole 81H. The shaft 88 is rotatably disposed in the bearing hole 81H.

[0201] The second intermediate element 86 includes a coupling member 90. The coupling member 90 is fixed to the shaft 88. The coupling member 90 is a separate member separate from the shaft 88. However, if needed and / or desired, the coupling member 90 can be integrally provided with the shaft 88 as a one-piece, unitary member.

[0202] The coupling member 90 includes a base portion 92, at least two intermediate portions 94, and at least two transmission portions 96. The base portion 92 is fixed to the shaft 88. The base portion 92 extends radially outward from the shaft 88. The intermediate portion 94 extends from the base portion 92 along the transmission structure rotation axis A7. The intermediate portion 94 is at least partially disposed between the first race 80 and the second race 81. The second race 81 includes at least two transmission holes 81D. The transmission portion 96 is disposed in the transmission hole 81D of the second race 81. The transmission portion 96 can contact the second race 81 to transmit the rotation between the second race 81 and the second intermediate element 86 around the transmission structure rotation axis A7.

[0203] As in Fig.17 As can be seen in FIG. 1 , the total number of the intermediate portions 94 is six. The total number of the transmission portions 96 is six. The total number of the transmission holes 81D is six. However, the total number of the intermediate portions 94 is not limited to six. The total number of the transmission portions 96 is not limited to six. The total number of the transmission holes 81D is not limited to six.

[0204] The intermediate portion 94 is at least partially disposed between two adjacent groups of intermediate member groups 84G along the circumferential direction D3. The intermediate portion 94 is at least partially disposed between the first rotatable portion 84A of the intermediate member group 84G and the second rotatable portion 84B of the other intermediate member group 84G along the circumferential direction D3.

[0205] In the present embodiment, the base portion 92, the at least two intermediate portions 94, and the at least two transmission portions 96 are integrally provided with each other as a one-piece unitary member. However, if needed and / or desired, at least one of the base portion 92, the at least two intermediate portions 94, and the at least two transmission portions 96 can be a separate member separated from the other of the base portion 92, the at least two intermediate portions 94, and the at least two transmission portions 96.

[0206] As in Fig.19 As can be seen in FIG. 1 , the second intermediate element 86 can rotate relative to the second race 81 about the transmission structure rotation axis A7 along the first circumferential direction D21 from the neutral position P20 to the first rotation position P21. Fig. 20 As can be seen in FIG. 1 , the second intermediate element 86 can rotate from the neutral position P20 to the second rotation position P22 relative to the second race 81 about the transmission structure rotation axis A7 along a second circumferential direction D22 different from the first circumferential direction D21. In the present embodiment, the second circumferential direction D22 is a direction opposite to the first circumferential direction D21. However, the second circumferential direction D22 may be a direction different from the opposite direction of the first circumferential direction D21.

[0207] As in Fig.17 , Fig.19 and Fig. 20As seen in FIG. 8 , the transmission portion 96 may contact the inner peripheral surface of the transmission hole 81D. Fig.17 As can be seen in FIG. 1 , in the initial state where the second intermediate element 86 is located at the neutral position P20, the transmission portion 96 is spaced apart from the inner peripheral surface of the transmission hole 81D. Fig.19 As can be seen in FIG. 1 , in the first rotation state where the second intermediate element 86 is located at the first rotation position P21, the transmission portion 96 is in contact with the inner peripheral surface of the transmission hole 81D. Fig. 20 As seen in FIG. 8 , in the second rotation state where the second intermediate element 86 is located at the second rotation position P22 , the transmission portion 96 is in contact with the inner peripheral surface of the transmission hole 81D.

[0208] As in Fig.17 , Fig.19 and Fig. 20 As seen in FIG. 1 , the intermediate portion 94 may be in contact with each of the first rotatable portion 84A and the second rotatable portion 84B. Fig.17 As seen in FIG. 1 , in the initial state in which the second intermediate element 86 is in the neutral position P20, the intermediate portion 94 is spaced apart from each of the first rotatable portion 84A and the second rotatable portion 84B. Fig.19 As can be seen in FIG. 1 , in the first rotation state where the second intermediate element 86 is located at the first rotation position P21, the intermediate portion 94 is in contact with the first rotatable portion 84A. Fig. 20 As seen in FIG. 8 , in the second rotation state where the second intermediate element 86 is located at the second rotation position P22 , the intermediate portion 94 is in contact with the second rotatable portion 84B.

[0209] As in Fig.17 As seen in FIG. 1 , the first intermediate element 84 is configured to restrict the second race 81 from rotating relative to the first race 80 along the first circumferential direction D21 relative to the transmission structure rotation axis A7 when the second race 81 receives the first rotation force F11 along the first circumferential direction D21. The first intermediate element 84 is configured to restrict the second race 81 from rotating relative to the first race 80 along the second circumferential direction D22 relative to the transmission structure rotation axis A7 when the second race 81 receives the second rotation force F12 along the second circumferential direction D22.

[0210] The first intermediate element 84 is configured to move toward the first race 80 in response to the second race 81 pushing the first intermediate element 84 along the first circumferential direction D21 relative to the transmission structure rotation axis A7. The first intermediate element 84 is configured to move toward the first race 80 in response to the second race 81 pushing the first intermediate element 84 along the second circumferential direction D22 different from the first circumferential direction D21. The first intermediate element 84 is configured to rotate together with the first race 80 in a state where the second race 81 pushes the first intermediate element 84 and the second intermediate element 86 does not push the first intermediate element 84. Since the first race 80 is fixed to the housing 38 of the bicycle motor unit 32, the first race 80 and the first intermediate element 84 are fixed relative to the housing 38 in a state where the second race 81 pushes the first intermediate element 84 and the second intermediate element 86 does not push the first intermediate element 84 (see, e.g. Fig.17 ).

[0211] The first rotatable portion 84A is configured to limit the second race 81 from rotating relative to the first race 80 along the first circumferential direction D21 relative to the transmission structure rotation axis A7 when the second race 81 receives the first rotational force F11 in the first circumferential direction D21. The second rotatable portion 84B is configured to limit the second race 81 from rotating relative to the first race 80 along the second circumferential direction D22 relative to the transmission structure rotation axis A7 when the second race 81 receives the second rotational force F12 in the second circumferential direction D22.

[0212] As in Fig.17 As seen in FIG. 1 , the contact surface 81C of the second race 81 is configured to press the first rotatable portion 84A against the inner circumferential surface 80A of the first race 80 when the second race 81 receives the first rotational force F11 in the first circumferential direction D21. When the second race 81 receives the first rotational force F11 in the first circumferential direction D21, the first race 80 and the second race 81 are locked by the first rotatable portion 84A. The first rotatable portion 84A is configured to restrict the second race 81 from rotating relative to the first race 80 along the first circumferential direction D21 around the transmission structure rotation axis A7 when the second race 81 receives the first rotational force F11 in the first circumferential direction D21. Therefore, the first race 80 (see, for example, FIG. 1 ) fixed to the housing 38 Fig.16 ) receives the first rotational force F11 transmitted to the second seat ring 81.

[0213] The contact surface 81C of the second race 81 is configured to press the second rotatable portion 84B against the inner circumferential surface 80A of the first race 80 when the second race 81 receives the second rotational force F12 in the second circumferential direction D22. When the second race 81 receives the second rotational force F12 in the second circumferential direction D22, the first race 80 and the second race 81 are locked by the second rotatable portion 84B. The second rotatable portion 84B is configured to restrict the second race 81 from rotating relative to the first race 80 along the second circumferential direction D22 around the transmission structure rotation axis A7 when the second race 81 receives the second rotational force F12 in the second circumferential direction. Therefore, the first race 80 (see, for example, Fig.16 ) receives the second rotational force F12 transmitted to the second seat ring 81.

[0214] The contact surface 81C of the second race 81 is configured so that when the second race 81 receives the second rotational force F12 in the second circumferential direction D22, the first rotatable portion 84A is not pressed against the inner circumferential surface 80A of the first race 80. The first rotatable portion 84A is configured so that when the second race 81 receives the second rotational force F12 in the second circumferential direction D22, the second race 81 is not restricted from rotating relative to the first race 80 along the second circumferential direction D22 around the transmission structure rotation axis A7.

[0215] The contact surface 81C of the second race 81 is configured so that when the second race 81 receives the first rotational force F11 in the first circumferential direction D21, the second rotatable portion 84B is not pressed against the inner circumferential surface 80A of the first race 80. The second rotatable portion 84B is configured so that when the second race 81 receives the first rotational force F11 in the first circumferential direction D21, the second race 81 is not restricted from rotating relative to the first race 80 along the first circumferential direction D21 around the transmission structure rotation axis A7.

[0216] As in Fig.19 As seen in FIG. 1 , the first intermediate element 84 is configured to move away from the first race 80 in response to the second intermediate element 86 pushing the first intermediate element 84 along the first circumferential direction D21. The first intermediate element 84 is configured to rotate relative to the first race 80 in a state where the second intermediate element 86 pushes the first intermediate element 84 and the second race 81 does not push the first intermediate element 84. The first intermediate element 84 is configured to move radially inward relative to the transmission structure rotation axis A7 in response to the second intermediate element 86 pushing the first intermediate element 84 along the first circumferential direction D21.

[0217] The second intermediate element 86 is configured to move the first intermediate element 84 relative to the second race 81 along the first circumferential direction D21 when the second intermediate element 86 receives the first rotational force F21 in the first circumferential direction D21, so as to allow the second race 81 to rotate relative to the first race 80 along the first circumferential direction D21 together with the second intermediate element 86. The first intermediate element 84 is configured to rotate relative to the first race 80 along the first circumferential direction D21 around the transmission structure rotation axis A7 together with the second race 81 and the second intermediate element 86 when the second intermediate element 86 receives the first rotational force F21 in the first circumferential direction D21.

[0218] The intermediate portion 94 of the second intermediate element 86 is configured to move the first rotatable portion 84A relative to the second race 81 along the first circumferential direction D21 in response to the first rotation of the second intermediate element 86 along the first circumferential direction D21 from the neutral position P20 to the first rotation position P21. The transmission portion 96 of the second intermediate element 86 is configured to rotate the second race 81 relative to the first race 80 along the first circumferential direction D21 in response to the first rotation of the second intermediate element 86 along the first circumferential direction D21 from the first rotation position P21. When the second intermediate element 86 receives the first rotational force F21 in the first circumferential direction D21, the second race 81, the first intermediate element 84, and the second intermediate element 86 rotate relative to the first race 80 along the first circumferential direction D21.

[0219] As in Fig. 20 As seen in FIG. 1 , the first intermediate element 84 is configured to move away from the first race 80 in response to the second intermediate element 86 pushing the first intermediate element 84 along the second circumferential direction D22 different from the first circumferential direction D21. The first intermediate element 84 is configured to rotate relative to the first race 80 in a state where the second intermediate element 86 pushes the first intermediate element 84 and the second race 81 does not push the first intermediate element 84. The first intermediate element 84 is configured to move radially inward relative to the transmission structure rotation axis A7 in response to the second intermediate element 86 pushing the first intermediate element 84 along the second circumferential direction D22.

[0220] The second intermediate element 86 is configured to move the first intermediate element 84 relative to the second race 81 along the second circumferential direction D22 when the second intermediate element 86 receives the second rotational force F22 along the second circumferential direction D22, so as to allow the second race 81 to rotate relative to the first race 80 along the second circumferential direction D22 together with the second intermediate element 86. The first intermediate element 84 is configured to rotate relative to the first race 80 along the second circumferential direction D22 around the transmission structure rotation axis A7 together with the second race 81 and the second intermediate element 86 when the second intermediate element 86 receives the second rotational force F22 along the second circumferential direction D22.

[0221] The intermediate portion 94 of the second intermediate element 86 is configured to move the second rotatable portion 84B relative to the second race 81 along the second circumferential direction D22 in response to the second rotation of the second intermediate element 86 from the neutral position P20 to the second rotation position P22 along the second circumferential direction D22. The transmission portion 96 of the second intermediate element 86 is configured to rotate the second race 81 relative to the first race 80 along the second circumferential direction D22 in response to the second rotation of the second intermediate element 86 from the second rotation position P22 along the second circumferential direction D22. When the second intermediate element 86 receives the second rotational force F22 along the second circumferential direction D22, the second race 81, the first intermediate element 84, and the second intermediate element 86 rotate relative to the first race 80 along the second circumferential direction D22.

[0222] As in Figure 7 , Fig.19 and Fig. 20 As can be seen in FIG. 6 , the additional transmission structure 62 is configured to transmit rotational force in multiple rotational directions based on the rotational direction of the output shaft 33A when the additional transmission structure 62 transmits rotational force. Multiple rotational directions are defined around the transmission structure rotation axis A7. The multiple rotational directions include a first circumferential direction D21 and a second circumferential direction D22. The additional transmission structure 62 is configured to transmit the first rotational force F21 along the first circumferential direction D21 based on the first rotational direction D31 of the output shaft 33A when the additional transmission structure 62 transmits the first rotational force F21. The additional transmission structure 62 is configured to transmit the first rotational force F21 along the second circumferential direction D22 based on the second rotational direction D32 of the output shaft 33A when the additional transmission structure 62 transmits the first rotational force F21. The second rotational direction D32 is a direction opposite to the first rotational direction D31.

[0223] As in Fig.21 As can be seen in FIG. 1 , the driving rotational force RF0 is transmitted from the electric motor 33 to the additional transmission structure 62. The driving rotational force RF0 is transmitted from the electric motor 33 to the transmission structure 60 via the additional transmission structure 62 because the driving rotational force RF0 causes the second intermediate element 86 and the second race 81 to rotate integrally (see, for example, FIG. 1 ). Fig.19 and Fig. 20 ).

[0224] The driving rotational force RF0 is set to be less than or equal to the rotational force threshold value TR. Therefore, the driving rotational force RF0 is transmitted from the electric motor 33 to the output member 56 via the additional transmission structure 62 and the transmission structure 60 as the output rotational force RF51 without being reduced by the transmission structure 60. Therefore, the chain guide 14 moves in response to the driving rotational force RF0 transmitted from the bicycle motor unit 32.

[0225] When the external force EF is applied to at least one of the chain guide 14 and the linkage mechanism 16, the external rotational force ERF is applied to the output member 56. The external rotational force ERF is transmitted from the output member 56 to the second rotatable member 56 of the transmission structure 60 as the input rotational force RF32.

[0226] In the case where the external rotational force ERF is less than or equal to the rotational force threshold TR, the external rotational force ERF is transmitted from the transmission structure 60 to the additional transmission structure 62 as the output rotational force RF52 without being reduced by the transmission structure 60 .

[0227] When the external rotational force ERF is greater than the rotational force threshold TR, the external rotational force ERF is transmitted from the transmission structure 60 to the additional transmission structure 62 as the output rotational force RF42. Fig.10 ) during the relative rotation between the two, the external rotational force ERF is reduced to the output rotational force RF42.

[0228] However, neither the output rotational forces RF52 nor RF42 are transmitted from the additional transmission structure 62 to the electric motor 33 because the first intermediate element 84 (see, e.g. Fig.17 ) limits the second race 81 from rotating relative to the first race 80. Since the first race 80 (see, for example Fig.17 ) is fixed to the housing 38, so the first race 80 and the second race 81 will not rotate relative to the housing 38 due to the output rotational force RF52 or RF42. Therefore, the external rotational force ERF is blocked by the additional transmission structure 62 and is not transmitted to the electric motor 33.

[0229] As in Fig.15 As seen in FIG. 1 , the bicycle motor unit 32 further includes a detection target 100. The bicycle motor unit 32 includes a detector 102 configured to detect the detection target 100. The detection target 100 is configured to be detected by the detector 102. The detector 102 is configured to detect a position of the detection target 100. The detection target 100 is coupled to the second rotatable member 66 to rotate about the rotation axis A6 together with the second rotatable member 66. The detector 102 is configured to detect a rotation position of the detection target 100. Therefore, the detector 102 is configured to detect a rotation position of the detection target 100. Therefore, the detector 102 is configured to detect a rotation position of the second rotatable member 66 of the transmission structure 60. The rotation position of the second rotatable member 66 corresponds to a position of the chain guide 14 and a gear position of the bicycle transmission RD. Therefore, the detector 102 is configured to detect a position of the chain guide 14 and a gear position of the bicycle transmission RD.

[0230] In the present embodiment, the detector 102 includes a non-contact detector, such as an angle sensor and an encoder. Examples of angle sensors include magnetoresistive sensors. Examples of encoders include magnetic sensors (e.g., Hall sensors) and optical sensors (e.g., photosensitive sensors). The detection target 100 includes a magnetic body (e.g., a magnet) and a light emitter (e.g., a light emitting diode (LED)). However, if necessary and / or desired, the detector 102 may include a contact detector. The detection target 100 may include components other than a magnetic body or a light emitter.

[0231] The bicycle motor unit 32 includes a calculation circuit 103. The calculation circuit 103 is electrically connected to the detector 102 to calculate the rotation angle of the detection target 100 based on the detection result of the detector 100. For example, the calculation circuit 103 is configured to calculate the absolute rotation angle of the detection target 100 based on the detection result of the detector 100.

[0232] As in Figure 7 As seen in FIG, the detection target 100 is disposed on the downstream side of the power transmission path TP relative to the additional transmission structure 62. The detection target 100 is disposed on the downstream side of the power transmission path TP relative to the transmission structure 60. The detection target 100 is disposed on the downstream side of the power transmission path TP relative to the transmission structure 60 along the first power transmission direction LD1. The detection target 100 is disposed on the downstream side of the power transmission path TP relative to the additional transmission structure 62 along the first power transmission direction LD1.

[0233] As in Fig. 22 As seen in FIG. 1 , the bicycle motor unit 32 includes an electronic controller 104, a motor driver 106, a communicator 108, a notification device 110, and an electric switch SW. The electronic controller 104 is electrically connected to the detector 102, the computing circuit 103, the motor driver 106, the communicator 108, and the notification device 110. The power source attachment structure 34 is electrically connected to the detector 102, the computing circuit 103, the electronic controller 104, the motor driver 106, the communicator 108, and the notification device 110. The electric power source 36 is electrically connected to the detector 102, the computing circuit 103, the electronic controller 104, the motor driver 106, the communicator 108, and the notification device 110 via the power source attachment structure 34 to supply power to the detector 102, the computing circuit 103, the electronic controller 104, the motor driver 106, the communicator 108, and the notification device 110 via the power source attachment structure 34.

[0234] As in Fig. 22As seen in FIG. 1 , the electronic controller 104 includes a processor 104P, a memory 104M, a circuit board 104C, and a bus 104D. The processor 104P and the memory 104M are electrically mounted on the circuit board 104C. The processor 104P and the memory 104M are electrically connected to the circuit board 104C via the bus 104D. The processor 104P is electrically connected to the memory 104M via the circuit board 104C and the bus 104D.

[0235] For example, the processor 104P includes at least one of a central processing unit (CPU), a microprocessing unit (MPU), and a memory controller. The memory 104M is electrically connected to the processor 104P. For example, the memory 104M includes at least one of a volatile memory and a non-volatile memory. Examples of volatile memories include random access memories (RAM) and dynamic random access memories (DRAM). Examples of non-volatile memories include read-only memories (ROM), electrically erasable programmable ROMs (EEPROMs), and hard disk drives (HDDs). The memory 104M includes storage areas each having an address. The processor 104P is configured to control the memory 104M to store data in a storage area of ​​the memory 104M and to read data from a storage area of ​​the memory 104M. The processor 104P may also be referred to as a hardware processor 104P. The memory 104M may also be referred to as a hardware memory 104M. The memory 104M may also be referred to as a computer-readable storage medium 104M.

[0236] The electronic controller 104 is programmed to execute at least one control algorithm of the bicycle transmission RD. The memory 104M (e.g., ROM) stores at least one program including at least one program instruction. The at least one program is read into the processor 104P, so that at least one control algorithm of the bicycle transmission RD is executed based on the at least one program. The electronic controller 104 can also be referred to as an electronic controller circuit or circuit system 104. The electronic controller 104 can also be referred to as a hardware electronic controller 104.

[0237] The structure of the electronic controller 104 is not limited to the above-described structure. Fig. 22 The structure shown is not limited to the processor 104P, the memory 104M and the bus 104D. The electronic controller 104 can be implemented by hardware alone or by a combination of hardware and software. The processor 104P and the memory 104M can be integrated into a chip, such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

[0238] The communicator 108 is configured to communicate with other devices such as the operating devices 3 and 4 and the bicycle transmission FD. The communicator 108 includes a wireless communicator WC. The electronic controller 104 is electrically connected to the wireless communicator WC to control the wireless communicator WC. The electronic controller 104 is configured to control the wireless communicator WC to perform pairing between the wireless communicator WC and other wireless communicators of the operating devices 3 and 4 and the bicycle transmission FD.

[0239] Wireless communicator WC is electrically connected to processor 104P and memory 104M using circuit board 104C and bus 104D. Wireless communicator WC includes a signal transmission circuit or circuit system and a signal reception circuit or circuit system. Therefore, wireless communicator WC may also be referred to as wireless communicator circuit or circuit system WC.

[0240] The wireless communicator WC is configured to superimpose a digital signal on a carrier wave using a predetermined wireless communication protocol to wirelessly transmit the signal. In the first embodiment, the wireless communicator WC is configured to encrypt the signal using an encryption key to generate an encrypted wireless signal. The wireless communicator WC includes at least one antenna. The wireless communicator WC is configured to transmit a wireless signal via at least one antenna. The wireless communicator WC may include at least two antennas. In the case where the wireless communicator WC includes at least two antennas, the wireless communicator WC may be configured to wirelessly communicate with another device of the bicycle 2 via one of the at least two antennas and to wirelessly communicate with a wireless device such as a smartphone, a tablet computer, and a personal computer via the other of the at least two antennas.

[0241] Wireless communicator WC is configured to receive wireless signals via an antenna. In a first embodiment, wireless communicator WC is configured to decode wireless signals to identify signals transmitted from other wireless communicators. Wireless communicator WC is configured to decrypt wireless signals using an encryption key.

[0242] The operating device 3 is configured to generate a control signal in response to a user input. For example, the operating device 3 includes a first electric switch, a first additional electric switch, and a first communicator. The first electric switch is configured to receive a first user input. The first additional electric switch is configured to receive a first additional user input. The first communicator is configured to wirelessly transmit a control signal CS11 in response to the first user input received by the first electric switch. The first communicator is configured to wirelessly transmit a control signal CS12 in response to the first additional user input received by the first additional electric switch. For example, the control signal CS11 indicates an upshift of a bicycle transmission RD. The control signal CS12 indicates a downshift of a bicycle transmission RD. The operating device 3 can be configured to transmit control signals via a cable as needed and / or desired.

[0243] The operating device 4 is configured to generate a control signal in response to a user input. For example, the operating device 4 includes a second electric switch, a second additional electric switch, and a second communicator. The second electric switch is configured to receive a second user input. The second additional electric switch is configured to receive a second additional user input. The second communicator is configured to wirelessly transmit a control signal CS21 in response to the second user input received by the second electric switch. The second communicator is configured to wirelessly transmit a control signal CS22 in response to the second additional user input received by the second additional electric switch. For example, the control signal CS21 indicates an upshift of the bicycle transmission FD. The control signal CS22 indicates a downshift of the bicycle transmission FD. The operating device 4 can be configured to transmit the control signal via a cable as needed and / or desired.

[0244] The wireless communicator WC is configured to wirelessly receive control signals CS11, CS12, CS21, and CS22 transmitted from the operating devices 3 and 4. The electronic controller 104 is configured to receive the control signals CS11, CS12, CS21, and CS22 wirelessly transmitted from the operating devices 3 and 4 via the wireless communicator WC. The wireless communicator WC is configured to wirelessly communicate with the wireless communicator of the bicycle transmission FD. The wireless communicator WC is configured to wirelessly transmit the control signals CS21 and CS22 transmitted from the operating device 4 to the bicycle transmission FD. If needed and / or desired, the communicator 108 may include a wired communicator configured to communicate with another wired communicator via a cable.

[0245] The motor driver 106 is electrically connected to the electric motor 33 and the electronic controller 104 to control the electric motor 33 based on the control signal transmitted from the electronic controller 104. The motor driver 106 is configured to control the power supplied from the electric power source 36 based on the control signals CS11 and CS12 transmitted from the electronic controller 104. That is, the electronic controller 104 is configured to control the electric motor 33 based on the control signals CS11 and CS12 transmitted from the operating devices 3 and 4.

[0246] The communicator 108 includes a wired communicator WD. The wired communicator WD is configured to communicate with another wired communicator of another device, such as a transmission FD, via a wired communication structure WS including a cable EC. The wired communicator WD is electrically connected to the electronic controller 104. The bicycle motor unit 32 is electrically connected to the external power source PS and the transmission FD via the wired communication structure WS. The transmission RD2 and FD are powered by the external power source PS.

[0247] As in Fig.23As seen in FIG. 1 , the wired communicator WD is configured to communicate with another wired communicator of another device via a wired communication structure WS using power line communication (PLC) technology. For example, the wired communication structure WS includes a ground line and a voltage line that are detachably connected to a serial bus formed by a communication interface. In the present embodiment, the wired communicator WD is configured to communicate with the transmission FD via a voltage line using PLC technology. Since PLC technology is known, it will not be described in detail here for the sake of brevity.

[0248] The electronic controller 104 is configured to control the wired communicator WD to transmit the control signal CS21 to the transmission FD via the wired communication structure WS when the wireless communicator WC wirelessly receives the control signal CS21 from the operating device 4. The electronic controller 104 is configured to control the wired communicator WD to transmit the control signal CS22 to the transmission FD via the wired communication structure WS when the wireless communicator WC wirelessly receives the control signal CS22 from the operating device 4.

[0249] The connection port 12P is electrically connected to the electronic controller 104 via the wired communicator WD. When the external power source PS is connected to the connection port 12P via the cable EC, power can be supplied from the external power source PS to the bicycle motor unit 32 via the connection port 12P and the wired communicator WD.

[0250] As in Fig. 22 As seen in FIG. 1 , the notification device 110 is configured to notify the user of information related to the bicycle transmission RD. The notification device 110 includes an indicator configured to indicate the information. For example, the indicator includes a light emitting diode.

[0251] The electric switch SW is configured to receive a user input from a user. The electric switch SW is configured to be activated in response to the user input. The electric switch SW is electrically connected to the electronic controller 104. The electronic controller 104 is configured to recognize the activation of the electric switch SW. The user input includes normal pressing, long pressing, and double pressing of the electric switch SW.

[0252] The electronic controller 104 is electrically connected to the calculation circuit 103 to receive the rotational position calculated by the calculation circuit 103. The electronic controller 104 is configured to monitor the current gear position of the bicycle transmission RD based on the rotational position calculated by the calculation circuit 103. The electronic controller 104 is configured to store the current gear position in the memory 104M.

[0253] The transmission structure 60 allows the output member 56 to rotate in a state where the external rotational force ERF is equal to or higher than the external torque threshold. Therefore, the chain guide 14 may be unintentionally moved by the external force EF generated by the physical contact between the obstacle and at least one of the chain guide 14 and the linkage mechanism 16. The bicycle motor unit 32 is configured to automatically return the chain guide 14 to a previous gear position, which is the position of the chain guide 14 before it is moved by the external force EF.

[0254] The electronic controller 104 is configured to periodically monitor the current gear position based on the rotational position calculated by the calculation circuit 103. The electronic controller 104 is configured to periodically determine whether the chain guide 14 is moved from the current gear position due to the external force EF based on the rotational position calculated by the calculation circuit 103. The electronic controller 104 is configured to determine that the chain guide 14 is moved from the current gear position due to the external force EF if the rotational position calculated by the calculation circuit 103 indicates that the chain guide 14 is moved and the electronic controller 104 does not receive the control signals CS11 and CS12 generated by the operating device 3.

[0255] If the electronic controller 104 determines that the chain guide 14 is moved from the current gear position by the external force EF, the electronic controller 104 controls the electric motor 33 to return the chain guide 14 to the previous gear position. The electronic controller 104 is configured to control the notification device 110 to notify the user that the chain guide 14 is moved by the external force EF.

[0256] Second embodiment

[0257] The following will refer to Fig.24 and Fig.25 A bicycle motor unit 232 according to a second embodiment will be described. The bicycle motor unit 232 has the same structure and / or configuration as the bicycle motor unit 32 except for the transmission structure 60. Therefore, elements having substantially the same functions as those of the elements in the first embodiment will be given the same numbers herein, and will not be described and / or illustrated in detail herein for the sake of brevity.

[0258] As in Fig.24 As seen in FIG. 2 , the bicycle motor unit 232 includes a transmission structure 260. The transmission structure 260 has a structure that is substantially the same as the structure of the transmission structure 60 described in the first embodiment. The transmission structure 260 includes a first rotatable member 264, a second rotatable member 266, and a resistance structure 68. The first rotatable member 264 is rotatable about a rotation axis A6. The second rotatable member 266 is rotatable relative to the first rotatable member 264 about a rotation axis A6.

[0259] The first rotatable member 264 includes a first gear G7. The first gear G7 is configured to mesh with the first additional gear G6 to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33 via the first additional gear G6. The second rotatable member 266 includes a second gear G8. The second gear G8 is configured to mesh with the second additional gear G9 to transmit the driving force (e.g., driving rotational force RF0) to the second additional gear G9.

[0260] The resistance structure 68 is at least partially radially disposed between the first rotatable member 264 and the second rotatable member 266 relative to the rotation axis A6 to resist relative rotation between the first rotatable member 264 and the second rotatable member 266 .

[0261] In the present embodiment, the resistance structure 68 is completely radially disposed between the first rotatable member 264 and the second rotatable member 266 relative to the rotation axis A6 to resist the relative rotation between the first rotatable member 264 and the second rotatable member 266. However, if needed and / or desired, the resistance structure 68 may be partially radially disposed between the first rotatable member 264 and the second rotatable member 266 relative to the rotation axis A6 to resist the relative rotation between the first rotatable member 264 and the second rotatable member 266.

[0262] The first rotatable member 264 is radially spaced apart from the second rotatable member 266 relative to the rotation axis A6. The second rotatable member 266 is at least partially disposed radially inwardly of the first rotatable member 264 relative to the rotation axis A6. In the present embodiment, the second rotatable member 266 is partially disposed radially inwardly of the first rotatable member 264 relative to the rotation axis A6. However, if needed and / or desired, the second rotatable member 266 can be completely disposed radially inwardly of the first rotatable member 264 relative to the rotation axis A6. If needed and / or desired, the first rotatable member 264 can be at least partially disposed radially inwardly of the second rotatable member 266 relative to the rotation axis A6.

[0263] The resistance member 70 is a separate member separate from at least one of the first rotatable member 264 and the second rotatable member 266. In the present embodiment, the resistance member 70 is a separate member separate from the first rotatable member 264 and the second rotatable member 266. However, if needed and / or desired, the resistance member 70 can be integrally provided with one of the first rotatable member 264 and the second rotatable member 266 as a one-piece unitary member.

[0264] The slidable member 72 is configured to slidably contact at least one of the first rotatable member 264 and the second rotatable member 266. The slidable member 72 extends circumferentially around the rotation axis A6. The slidable member 72 is radially deformed between the first rotatable member 264 and the second rotatable member 266.

[0265] As in Fig.25 As seen in FIG. 1 , the slidable member 72 is configured to slidably contact both the first rotatable member 264 and the second rotatable member 266. The base portion 72A slidably contacts the second rotatable member 266. At least two slidable portions 72B slidably contact the first rotatable member 264. The base portion 72A extends circumferentially around the rotation axis A6. At least two slidable portions 72B radially protrude from the base portion 72A toward one of the first rotatable member 264 and the second rotatable member 266. At least two slidable portions 72B radially protrude from the base portion 72A toward the first rotatable member 264 inwardly. However, if needed and / or desired, at least two slidable portions 72B radially protrude from the base portion 72A toward the second rotatable member 266. If needed and / or desired, the base portion 72A can be configured to slidably contact the first rotatable member 264. If needed and / or desired, at least two slidable portions 72B can be configured to slidably contact the second rotatable member 266 .

[0266] As in Fig.24 As seen in FIG. 1 , the first rotatable member 264 includes a first coupling portion 274 coupled to the resistance structure 68. The second rotatable member 266 includes a second coupling portion 276 coupled to the resistance structure 68. The second coupling portion 276 is at least partially disposed radially outward of the first coupling portion 274. The first coupling portion 274 has a tubular shape. The second coupling portion 276 has a tubular shape. The first rotatable member 264 includes a hole 264H. The hole 264H extends along the rotation axis A6. The first coupling portion 274 includes a hole 264H.

[0267] In this embodiment, the second rotatable member 266 includes a radially inner portion 275. The radially inner portion 275 is disposed radially inwardly of the second coupling portion 276 relative to the rotation axis A6. The first coupling portion 274 is at least partially radially disposed between the second coupling portion 276 and the radially inner portion 275 relative to the rotation axis A6.

[0268] The second rotatable member 266 is at least partially disposed in the hole 264H. The radially inner portion 275 extends from the second gear G8 along the rotation axis A6. The radially inner portion 275 is at least partially disposed in the hole 264H. The first rotatable member 264 can slide with the radially inner portion 275. The first coupling portion 274 can slide with the radially inner portion 275. For example, grease can be provided between the first coupling portion 274 and the radially inner portion 275.

[0269] The second rotatable member 266 includes a second hole 266H. The second hole 266H extends along the rotation axis A6. The second coupling portion 276 includes the second hole 266H. The first coupling portion 274 is at least partially disposed radially inward of the second coupling portion 276. The first coupling portion 274 is at least partially disposed in the second hole 266H.

[0270] In the present embodiment, the first coupling portion 274 is partially disposed radially inwardly of the second coupling portion 276. The first coupling portion 274 is partially disposed within the second hole 266H. However, if necessary and / or desired, the first coupling portion 274 can be completely disposed radially inwardly of the second coupling portion 276. If necessary and / or desired, the first coupling portion 274 can be completely disposed in the second hole 266H. If necessary and / or desired, the second coupling portion 276 can be at least partially disposed radially inwardly of the first coupling portion 274.

[0271] The second rotatable member 266 includes a second extending portion 277. The second extending portion 277 extends between the radially inner portion 275 and the second coupling portion 276 so that the second coupling portion 276 can rotate integrally with the radially inner portion 275 about the rotation axis A6.

[0272] The second extension portion 277 radially extends from the second coupling portion 276 toward the radially inner portion 275. The second extension portion 277 extends radially inward from the second coupling portion 276 toward the radially inner portion 275. The second extension portion 277 is coupled to the radially inner portion 275 to rotate integrally with the radially inner portion 275 around the rotation axis A6. The second extension portion 277 is integrally provided with the second coupling portion 276. Therefore, the second coupling portion 276 and the second extension portion 277 can rotate integrally with the radially inner portion 275 and the second gear G8 around the rotation axis A6.

[0273] In the present embodiment, the second extension portion 277 is coupled to the radially inner portion 275 using a structure such as a sawtooth or a spline. For example, the second extension portion 277 includes at least two first teeth 277A. The radially inner portion 275 includes at least two second teeth 275A. The at least two first teeth 277A mesh with the at least two second teeth 275A. However, if needed and / or desired, the second extension portion 277 can be coupled to the radially inner portion 275 using a structure other than a sawtooth or a spline.

[0274] As in Fig.24 As seen in the figure, the first rotatable member 264 is operably connected to the electric motor 33 to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33. The second rotatable member 266 is configured to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33 via the resistance structure 68 and the first rotatable member 264. However, if needed and / or desired, the second rotatable member 266 can be operably connected to the electric motor 33 to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33. If needed and / or desired, the first rotatable member 264 is configured to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33 via the resistance structure 68 and the second rotatable member 266.

[0275] The first gear G7 is coupled to the first coupling portion 274. The first coupling portion 274 extends from the first gear G7 along the rotation axis A6. The first gear G7 radially protrudes from the first coupling portion 274 relative to the rotation axis A6. The first gear G7 protrudes radially outward from the first coupling portion 274 relative to the rotation axis A6. In the present embodiment, the first gear G7 is integrally provided with the first coupling portion 274 as a one-piece, unitary component. However, if necessary and / or desired, the first gear G7 may be a separate component separated from the first coupling portion 274.

[0276] The second gear G8 is connected to the second coupling portion 276. The second coupling portion 276 extends from the second gear G8 along the rotation axis A6. The second gear G8 extends from the second coupling portion 276 along the rotation axis A6. The second gear G8 is at least partially disposed in the hole 264H. In the present embodiment, the second gear G8 is completely disposed outside the hole 264H. The second gear G8 is a separate component separated from the second coupling portion 276. However, if needed and / or desired, the second gear G8 may be partially disposed outside the hole 264H. If needed and / or desired, the second gear G8 may be integrally disposed with the second coupling portion 276 as a one-piece integral component.

[0277] As in Fig.25As seen in FIG. 2 , the first coupling portion 274 includes a first contact surface 274A that can contact the resistance structure 68 . The second coupling portion 276 includes a second contact surface 276A that can contact the resistance structure 68 .

[0278] The first contact surface 274A at least partially defines the hole 264H. The first contact surface 274A extends circumferentially around the rotation axis A6. The second contact surface 276A extends circumferentially around the rotation axis A6. The first contact surface 274A radially faces the second contact surface 276A. The second contact surface 276A radially faces the first contact surface 274A.

[0279] The first contact surface 274A is radially spaced apart from the second contact surface 276A relative to the rotation axis A6. In the present embodiment, the first contact surface 274A is disposed radially inwardly of the second contact surface 276A relative to the rotation axis A6. However, if needed and / or desired, the first contact surface 274A may be disposed radially outwardly of the second contact surface 276A relative to the rotation axis A6.

[0280] The description regarding the bicycle motor unit 32 described in the first embodiment may be used as a description regarding the bicycle motor unit 232. Therefore, for the sake of brevity, the bicycle motor unit 232 will not be described in detail herein.

[0281] If needed and / or desired, the first rotatable member 264 may be disposed Fig.26 The location shown. Fig.26 In the variant shown, the first coupling portion 274 is arranged closer to the second gear G8 than to the first gear G7 along an axial direction D6 parallel to the rotation axis A6. At least two first teeth 277A mesh with teeth of the second gear G8. At least two second teeth 275A are omitted from the second rotatable member 266.

[0282] Third embodiment

[0283] The following will refer to Fig. 27 and Fig.28 A bicycle motor unit 332 according to a third embodiment will be described. The bicycle motor unit 332 has the same structure and / or configuration as the bicycle motor unit 32 except for the transmission structure 60. Therefore, elements having substantially the same functions as those of the elements in the first or second embodiment are given the same numbers herein, and for the sake of brevity, will not be described and / or illustrated in detail herein.

[0284] As in Fig. 27, the bicycle motor unit 332 includes a transmission structure 360. The transmission structure 360 ​​has a structure that is substantially the same as the structure of the transmission structure 60 described in the first embodiment. The transmission structure 360 ​​includes a first rotatable member 364, a second rotatable member 66, and a resistance structure 68. The first rotatable member 364 is rotatable about a rotation axis A6. The second rotatable member 66 is rotatable about the rotation axis A6 relative to the first rotatable member 364. The first rotatable member 364 includes a first gear G7.

[0285] The resistance structure 68 is at least partially radially disposed between the first rotatable member 364 and the second rotatable member 66 relative to the rotation axis A6 to resist relative rotation between the first rotatable member 364 and the second rotatable member 66 .

[0286] In the present embodiment, the resistance structure 68 is completely radially disposed between the first rotatable member 364 and the second rotatable member 66 relative to the rotation axis A6 to resist the relative rotation between the first rotatable member 364 and the second rotatable member 66. However, if needed and / or desired, the resistance structure 68 may be partially radially disposed between the first rotatable member 364 and the second rotatable member 66 relative to the rotation axis A6 to resist the relative rotation between the first rotatable member 364 and the second rotatable member 66.

[0287] The first rotatable member 364 is radially spaced apart from the second rotatable member 66 relative to the rotation axis A6. The second rotatable member 66 is at least partially disposed radially inwardly of the first rotatable member 364 relative to the rotation axis A6. In the present embodiment, the second rotatable member 66 is partially disposed radially inwardly of the first rotatable member 364 relative to the rotation axis A6. However, if needed and / or desired, the second rotatable member 66 may be completely disposed radially inwardly of the first rotatable member 364 relative to the rotation axis A6. If needed and / or desired, the first rotatable member 364 may be at least partially disposed radially inwardly of the second rotatable member 66 relative to the rotation axis A6.

[0288] The resistance member 70 is a separate member from at least one of the first rotatable member 364 and the second rotatable member 66. In the present embodiment, the resistance member 70 is a separate member from the first rotatable member 364 and the second rotatable member 66. However, if needed and / or desired, the resistance member 70 can be integrally provided with one of the first rotatable member 364 and the second rotatable member 66 as a one-piece unitary member.

[0289] The slidable member 72 is configured to slidably contact at least one of the first rotatable member 364 and the second rotatable member 66. The slidable member 72 extends circumferentially around the rotation axis A6. The slidable member 72 is radially deformed between the first rotatable member 364 and the second rotatable member 66.

[0290] As in Fig. 27 As seen in FIG. 1 , the slidable member 72 is configured to slidably contact both the first rotatable member 364 and the second rotatable member 66. The base portion 72A slidably contacts the first rotatable member 364. At least two slidable portions 72B slidably contact the second rotatable member 66. The base portion 72A extends circumferentially around the rotation axis A6. At least two slidable portions 72B radially protrude from the base portion 72A toward one of the first rotatable member 364 and the second rotatable member 66. At least two slidable portions 72B radially protrude from the base portion 72A toward the second rotatable member 66 radially inward. However, if needed and / or desired, at least two slidable portions 72B radially protrude from the base portion 72A toward the first rotatable member 364 radially outward. The base portion 72A can be configured to slidably contact the second rotatable member 66 as needed and / or desired. At least two slidable portions 72B can be configured to slidably contact the first rotatable member 364 as needed and / or desired.

[0291] As in Fig. 27 As seen in FIG. 1 , the first rotatable member 364 includes a first coupling portion 374 coupled to the resistance structure 68. The second rotatable member 66 includes a second coupling portion 76 coupled to the resistance structure 68. The second coupling portion 76 is at least partially disposed radially inwardly of the first coupling portion 374. The first coupling portion 374 has a tubular shape. The first rotatable member 364 includes a hole 64H. The hole 64H extends along the rotation axis A6. The first coupling portion 374 includes a hole 264H. The second coupling portion 76 is at least partially disposed in the hole 64H.

[0292] In the present embodiment, the second coupling portion 76 is completely disposed radially inwardly of the first coupling portion 374. The second coupling portion 76 is completely disposed within the hole 64H. However, if necessary and / or desired, the second coupling portion 76 can be partially disposed radially inwardly of the first coupling portion 374. If necessary and / or desired, the second coupling portion 76 can be partially disposed in the hole 64H. If necessary and / or desired, the first coupling portion 374 can be at least partially disposed radially inwardly of the second coupling portion 76.

[0293] As in Fig. 27As seen in the figure, the first rotatable member 364 is operatively coupled to the electric motor 33 to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33. The second rotatable member 66 is configured to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33 via the resistance structure 68 and the first rotatable member 364. However, the second rotatable member 66 can be operatively coupled to the electric motor 33 to receive the driving force (e.g., driving rotational force) from the electric motor 33 as needed and / or desired. The first rotatable member 364 is configured to receive the driving force (e.g., driving rotational force RF0) from the electric motor 33 via the resistance structure 68 and the second rotatable member 66 as needed and / or desired.

[0294] The first gear G7 is connected to the first connecting portion 374. The first connecting portion 374 includes a first contact surface 74A that can contact the resistance structure 68. The first connecting portion 374 extends from the first gear G7 along the rotation axis A6. The first gear G7 radially protrudes from the first connecting portion 374 relative to the rotation axis A6. The first gear G7 protrudes radially outward from the first connecting portion 374 relative to the rotation axis A6. In the present embodiment, the first gear G7 is a separate component separated from the first connecting portion 374. However, if needed and / or desired, the first gear G7 can be integrally provided with the first connecting portion 374 as a one-piece integral component.

[0295] The first coupling portion 374 is a separate member from the first gear G7. The first coupling portion 374 includes a first engaging portion 374B. The first gear G7 includes a second engaging portion 379. The second engaging portion 379 includes an engaging recess 379B. The first engaging portion 374B is at least partially disposed in the engaging recess 379B.

[0296] In this embodiment, as in Fig.28 As seen in , the first engaging portion 374B is connected to the second engaging portion 379 using a structure such as a sawtooth or a spline. For example, the first engaging portion 374B includes at least two first engaging teeth 374C. The second engaging portion 379 includes at least two second engaging teeth 379C that at least partially define the engaging recess 379B. At least two first engaging teeth 374C mesh with at least two second engaging teeth 379C. Therefore, the first coupling portion 374 rotates integrally with the first gear G7 around the rotation axis A6 relative to the second rotatable member 66. If necessary and / or desired, the first engaging portion 374B can be connected to the second engaging portion 379 using another structure other than a sawtooth or a spline.

[0297] As in Fig. 27As seen in FIG. 1 , the first rotatable member 364 includes a first protruding portion 64P. The first protruding portion 64P is disposed radially closer to the second rotatable member 66 than the first coupling portion 374 relative to the rotation axis A6. The first protruding portion 64P radially protrudes from the first coupling portion 374 toward the second rotatable member 66 relative to the rotation axis A6.

[0298] In the present embodiment, the first protrusion 64P is disposed radially inwardly closer to the second rotatable member 66 than the first coupling portion 374 relative to the rotation axis A6. The first protrusion 64P is disposed radially inwardly closer to the second gear G8 than the first coupling portion 374 relative to the rotation axis A6. The first protrusion 64P protrudes radially inwardly from the first coupling portion 374 toward the second rotatable member 66 relative to the rotation axis A6. The first protrusion 64P protrudes radially inwardly from the first coupling portion 374 toward the second gear G8 relative to the rotation axis A6. The first protrusion 64P has an annular shape.

[0299] However, the first protruding portion 64P may have a shape other than an annular shape if needed and / or desired.The first protruding portion 64P may be omitted from the first rotatable member 364 in the third embodiment if needed and / or desired.

[0300] The second protruding portion 66P is disposed radially closer to the first rotatable member 364 relative to the rotation axis A6 than the second coupling portion 76. The second protruding portion 66P radially protrudes from the second coupling portion 76 toward the first rotatable member 364 relative to the rotation axis A6.

[0301] In the present embodiment, the second protrusion 66P is disposed radially inwardly closer to the first rotatable member 364 than the second coupling portion 76 relative to the rotation axis A6. The second protrusion 66P is disposed radially inwardly closer to the first coupling portion 374 than the second coupling portion 76 relative to the rotation axis A6. The second protrusion 66P protrudes radially outwardly from the second coupling portion 76 toward the first rotatable member 364 relative to the rotation axis A6. The second protrusion 66P protrudes radially outwardly from the second coupling portion 76 toward the first coupling portion 374 relative to the rotation axis A6. The second protrusion 66P is disposed radially outside the second contact surface 76A. The second protrusion 66P has an annular shape.

[0302] However, if needed and / or desired, the second protruding portion 66P may have any shape other than a ring shape.If needed and / or desired, the second protruding portion 66P may be omitted from the second rotatable member 66 in the third embodiment.

[0303] The second distance DS34 is radially defined between the second protruding portion 66P and the first coupling portion 374. The third distance DS35 is radially defined between the first coupling portion 374 and the second coupling portion 76. In the present embodiment, each of the first distance DS3 and the second distance DS34 is shorter than the third distance DS35. However, if necessary and / or desired, at least one of the first distance DS3 and the second distance DS34 may be longer than or equal to the third distance DS35. If necessary and / or desired, the first protruding portion 64P may be omitted from the first rotatable member 364. If necessary and / or desired, the second protruding portion 66P may be omitted from the second rotatable member 66.

[0304] As in Fig.28 As seen in the figure, when viewed along the rotation axis A6, the first protrusion 64P at least partially overlaps the resistance structure 68. In the present embodiment, when viewed along the rotation axis A6, the first protrusion 64P completely overlaps the resistance structure 68. However, if needed and / or desired, the first protrusion 64P can be arranged to partially overlap the resistance structure 68 when viewed along the rotation axis A6.

[0305] The bicycle motor unit 32 further includes a limiting member 367. The limiting member 367 is coupled to at least one of the first rotatable member 364 and the second rotatable member 66 to limit relative movement therebetween along the rotation axis A6.

[0306] In the present embodiment, the limiting member 367 is coupled to the second rotatable member 66 to limit the relative movement along the rotation axis A6 between the first rotatable member 364 and the second rotatable member 66. The limiting member 367 is coupled to the second gear G8 to limit the relative movement along the rotation axis A6 between the first rotatable member 364 and the second rotatable member 66.

[0307] For example, the limiting member 367 has an annular shape. The limiting member 367 includes at least two teeth 367A. The at least two teeth 367A mesh with the teeth in the second gear G8. The limiting member 367 is fixed to the second gear G8 using the at least two teeth 367A and the teeth of the second gear G8. Therefore, the limiting member 367 limits the movement of the first gear G7 relative to the first coupling portion 374 and the second rotatable member 66 within a specific range.

[0308] If needed and / or desired, the limiting member 367 can be coupled to the first rotatable member 364 to limit relative movement between the first rotatable member 364 and the second rotatable member 66 along the rotation axis A6. The limiting member 367 can be omitted from the bicycle motor unit 332 if needed and / or desired.

[0309] Fourth embodiment

[0310] The following will refer to Fig.29 and Fig.30 A bicycle motor unit 432 according to a fourth embodiment will be described. The bicycle motor unit 432 has the same structure and / or configuration as the bicycle motor unit 32 except for the transmission structure 60. Therefore, elements having substantially the same functions as those of the elements in the first, second and third embodiments are given the same numbers herein and will not be described and / or illustrated in detail herein for the sake of brevity.

[0311] As in Fig.29 As seen in the figure, the bicycle motor unit 432 includes a transmission structure 460. The transmission structure 460 has a structure that is substantially the same as the structure of the transmission structure 60 described in the first embodiment. The transmission structure 460 includes a first rotatable member 64, a second rotatable member 66, and a resistance structure 68. The first rotatable member 64 is rotatable about a rotation axis A6. The second rotatable member 66 is rotatable about the rotation axis A6 relative to the first rotatable member 64. The first rotatable member 64 includes a first gear G7.

[0312] The transmission structure 460 includes a radial support 471. The radial support 471 is radially disposed between the first rotatable member 64 and the second rotatable member 66 relative to the rotation axis A6. The radial support 471 is a separate component separated from the first rotatable member 64 and the second rotatable member 66. The radial support 471 is a separate component separated from the resistance structure 68. However, if needed and / or desired, the radial support 471 can be integrally provided with one of the first rotatable member 64, the second rotatable member 66 and the resistance structure 68 as a one-piece integral component.

[0313] The radial support 471 may contact at least one of the first rotatable member 64 and the second rotatable member 66 to reduce radial movement of the second rotatable member 66 relative to the first rotatable member 64. The radial support 471 may contact at least one of the first coupling portion 74 and the second coupling portion 76 to reduce radial movement of the second rotatable member 66 relative to the first rotatable member 64.

[0314] In the present embodiment, the radial support 471 may contact the first rotatable member 64 and the second rotatable member 66 to reduce the radial movement of the second rotatable member 66 relative to the first rotatable member 64. The radial support 471 may contact the first coupling portion 74 and the second coupling portion 76 to reduce the radial movement of the second rotatable member 66 relative to the first rotatable member 64.

[0315] As in Fig.30As seen in FIG. 4 , the radial support 471 is at least partially circumferentially disposed between the first circumferential end 70A and the second circumferential end 70B. In the present embodiment, the radial support 471 is completely circumferentially disposed between the first circumferential end 70A and the second circumferential end 70B. However, if needed and / or desired, the radial support 471 may be partially circumferentially disposed between the first circumferential end 70A and the second circumferential end 70B.

[0316] In this embodiment, as in Fig.29 As seen in FIG. 4 , the radial support 471 extends along the axis of rotation A6. Fig.30 As seen in FIG. 4 , for example, radial support 471 has a cylindrical shape. However, radial support 471 may have a shape other than a cylindrical shape if needed and / or desired. The total number of radial support 471 is not limited to one.

[0317] In each of the first to fourth embodiments and their variants, the resistance member 70 of the resistance structure 68 includes a slidable member 72. However, the resistance structure 68 may include any structure (e.g., teeth (e.g., splines, serrated teeth), a deformable member such as a spring (e.g., a coil spring), a surface treatment portion), which is configured to resist the relative rotation between the first rotatable member 64 and the second rotatable member 66 as needed and / or desired. For example, in the first embodiment, the resistance structure 68 may include a first tooth and a second tooth. The first tooth protrudes radially inward from the first rotatable member 64. The second tooth protrudes from the second rotatable member 66. The first tooth and the second tooth are slidably engaged to resist the relative rotation between the first rotatable member 64 and the second rotatable member 66. The first tooth and the second tooth can be applied to the resistance member described in each of the second to fourth embodiments and their variants. If needed and / or desired, the resistance structure 68 can be at least partially provided integrally with at least one of the first rotatable member 64 and the second rotatable member 66. In the first embodiment, for example, the teeth may be at least partially integrally provided with at least one of the first rotatable member 64 and the second rotatable member 66. If necessary and / or desired, the first teeth may be at least partially integrally provided with the first rotatable member 64. If necessary and / or desired, the first teeth may be at least partially integrally provided with the first coupling portion 74. The first teeth may be applied to the resistance member described in each of the second to fourth embodiments and variants thereof. If necessary and / or desired, the second teeth may be at least partially integrally provided with the second rotatable member 66. If necessary and / or desired, the second teeth may be at least partially integrally provided with the second coupling member 76. The second teeth may be applied to the resistance member described in each of the second to fourth embodiments and variants thereof.

[0318] In the bicycle motor unit 32 described in the first embodiment, the first rotatable member 64 is rotatably coupled to the second rotatable member 66 via the resistance structure 68. However, if needed and / or desired, the first rotatable member 64 may be rotatably coupled to the second rotatable member 66 via the resistance structure 68 and another member such as a gear. If needed and / or desired, a structure other than the resistance structure 68 may be provided between the first rotatable member 64 and the second rotatable member 66. If needed and / or desired, the same modifications may be applied to the bicycle motor units 232, 332 and 432 described in the second to fourth embodiments and modifications thereof.

[0319] Each of the bicycle motor units 32, 232, 332 and 432 and variations thereof are applied to a bicycle transmission RD. However, if needed and / or desired, at least one of the bicycle motor units 32, 232, 332 and 432 and variations thereof can be applied to other devices, such as a bicycle transmission FD, an adjustable seat post, a suspension, and an auxiliary drive unit.

[0320] The additional transmission structure 62 may be omitted from each of the bicycle motor units 32, 232, 332 and 432 and variations thereof. The structure of the additional transmission structure 62 is not limited to the structure described in each of the first to fourth embodiments and variations thereof.

[0321] In this application, the term "comprise" and its derivatives used herein are intended to represent open-ended terms that specify the presence of stated features, elements, components, groups, integers and / or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and / or steps. This concept also applies to words with similar meanings, such as the terms "have", "include" and their derivatives.

[0322] The terms “member,” “section,” “portion,” “component,” “element,” “body,” and “structure” when used in the singular can have the dual meaning of a single part or a plurality of parts.

[0323] Ordinal numbers such as “first” and “second” mentioned in the present application are only identifications and do not have any other meanings, such as a specific order, etc. In addition, for example, the term “first element” itself does not imply the existence of a “second element”, and the term “second element” itself does not imply the existence of a “first element”.

[0324] In addition to a configuration in which a pair of elements have the same shape or structure as each other, the term "a pair" used herein may also encompass a configuration in which a pair of elements have shapes or structures different from each other.

[0325] The terms "a" (or "an"), "one or more" and "at least one" are used interchangeably herein.

[0326] The phrase “at least one of…” used in the present disclosure refers to “one or more” of the desired options. For example, if the number of its options is two, the phrase “at least one of…” used in the present disclosure refers to “only a single option” or “both of the two options”. For example, if the number of its options is equal to or greater than three, the phrase “at least one of…” used in the present disclosure refers to “only a single option” or “any combination of equal to or greater than two options”. For example, the phrase “at least one of A and B” covers: (1) A alone, (2) B alone, and (3) both A and B. The phrase “at least one of A, B, and C” covers: (1) A alone, (2) B alone, (3) C alone, (4) both A and B, (5) both B and C, (6) both A and C, and (7) all of A, B, and C. In other words, in the present disclosure, the phrase “at least one of A and B” does not mean “at least one of A and at least one of B”.

[0327] Finally, terms of degree such as "substantially", "about" and "approximately" as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. All numerical values ​​described in this application may be interpreted as including terms such as "substantially", "about" and "approximately".

[0328] Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings.It is therefore to be understood that within the scope of the appended claims, the present invention may be practiced otherwise than as specifically described herein.

Claims

1. A bicycle motor unit, comprising: an electric motor configured to generate a driving force; and a transmission structure coupled to the electric motor to transmit driving force from the electric motor to an actuated device of the bicycle, the transmission structure comprising: a first rotatable member rotatable about an axis of rotation; a second rotatable member rotatable about the rotation axis relative to the first rotatable member; and A resisting structure is at least partially radially disposed between the first rotatable member and the second rotatable member relative to the rotation axis to resist relative rotation between the first rotatable member and the second rotatable member.

2. The bicycle motor unit according to claim 1, wherein: The first rotatable member is radially spaced apart from the second rotatable member relative to the rotation axis.

3. The bicycle motor unit according to claim 1, wherein: The second rotatable member is at least partially disposed radially inwardly of the first rotatable member relative to the rotation axis.

4. The bicycle motor unit according to claim 1, wherein: The resistance structure includes a resistance member, and The resistance member is a separate member from at least one of the first rotatable member and the second rotatable member.

5. The bicycle motor unit according to claim 4, wherein: The resistance member includes a slidable member configured to slidably contact at least one of the first rotatable member and the second rotatable member.

6. The bicycle motor unit according to claim 1, wherein: The first rotatable member includes a first coupling portion coupled to the resisting structure, and The second rotatable member includes a second coupling portion coupled to the resistance structure.

7. The bicycle motor unit according to claim 6, wherein: The second coupling portion is at least partially disposed radially inwardly of the first coupling portion.

8. The bicycle motor unit according to claim 6, wherein: The second coupling portion is at least partially disposed radially outside the first coupling portion.

9. The bicycle motor unit according to claim 6, wherein: The first coupling portion comprises a first contact surface capable of coming into contact with the resisting structure, The second coupling portion comprises a second contact surface capable of contacting the resisting structure, and The first contact surface is radially spaced from the second contact surface relative to the rotational axis.

10. The bicycle motor unit according to claim 6, wherein: The first rotatable member includes a first protruding portion, and The first protruding portion is disposed closer to the second rotatable member than the first coupling portion in a radial direction with respect to the rotation axis.

11. The bicycle motor unit according to claim 10, wherein: When viewed along the rotation axis, the first protruding portion at least partially overlaps the resisting structure.

12. The bicycle motor unit according to claim 6, wherein: The second rotatable member includes a second protruding portion, and The second protruding portion is disposed closer to the first rotatable member than the second coupling portion in a radial direction with respect to the rotation axis.

13. The bicycle motor unit according to claim 12, wherein: When viewed along the rotation axis, the second protruding portion at least partially overlaps the resisting structure.

14. The bicycle motor unit according to claim 6, wherein: The second rotatable member includes a radially inner portion disposed radially inwardly of the second coupling portion relative to the rotation axis, and The first coupling portion is at least partially radially disposed relative to the rotation axis between the second coupling portion and the radially inner portion.

15. The bicycle motor unit according to claim 14, wherein: The second rotatable member includes a second extension portion extending between the radially inner portion and the second coupling portion such that the second coupling portion is rotatable integrally with the radially inner portion about the rotation axis.

16. The bicycle motor unit according to claim 1, wherein: The first rotatable member is operatively coupled to the electric motor to receive driving force from the electric motor, and The second rotatable member is configured to receive a driving force from the electric motor via the resistance structure and the first rotatable member.

17. The bicycle motor unit according to claim 1, wherein: The first rotatable member includes a first gear, and The first gear is configured to mesh with a first additional gear to receive a driving force from the electric motor via the first additional gear.

18. The bicycle motor unit according to claim 1, wherein: The second rotatable member includes a second gear, and The second gear is configured to mesh with the second additional gear to transmit the driving force to the second additional gear.

19. The bicycle motor unit according to claim 18, wherein: The first rotatable member includes a bore extending along the rotational axis, and The second gear is at least partially disposed in the aperture.

20. The bicycle motor unit according to claim 6, wherein: The first rotatable member includes a first gear, The first gear is configured to mesh with a first additional gear to receive a driving force from the electric motor via the first additional gear, and The first gear is coupled to the first coupling portion.

21. The bicycle motor unit according to claim 20, wherein: The first coupling portion extends from the first gear along the rotation axis.

22. The bicycle motor unit according to claim 20, wherein: the second rotatable member comprises a second gear, The second gear is configured to mesh with the second additional gear to transmit the driving force to the second additional gear, and The second gear is coupled to the second coupling portion.

23. The bicycle motor unit according to claim 22, wherein: The second coupling portion extends from the second gear along the rotation axis.

24. The bicycle motor unit according to claim 1, wherein: The transmission structure includes a radial bearing disposed radially between the first rotatable member and the second rotatable member relative to the rotation axis.

25. The bicycle motor unit according to claim 24, wherein: The radial bearing is a separate component from the first rotatable component and the second rotatable component.

26. The bicycle motor unit according to claim 24, wherein: The radial bearing is contactable with at least one of the first rotatable member and the second rotatable member to reduce radial movement of the second rotatable member relative to the first rotatable member.

27. The bicycle motor unit according to claim 1, further comprising: A limiting member is coupled to at least one of the first rotatable member and the second rotatable member to limit relative movement between the first rotatable member and the second rotatable member along the rotation axis.

28. The bicycle motor unit according to claim 1, wherein: The resistance structure allows relative rotation between the first rotatable member and the second rotatable member in response to an input of a predetermined rotational force transmitted from at least one of the first rotatable member and the second rotatable member.

29. The bicycle motor unit according to claim 1, further comprising: a housing, the housing comprising an interior space, The transmission structure is at least partially disposed in the inner space.

30. The bicycle motor unit according to claim 29, wherein: the second rotatable member comprising a first axial end and a second axial end, The second rotatable member extends along the rotational axis between the first axial end and the second axial end, and At least one of the first axial end portion and the second axial end portion is rotatably supported by the housing about the rotation axis.

31. A bicycle transmission, comprising: base member; a chain guide movably coupled to the base member; and The bicycle motor unit according to claim 1, wherein the bicycle motor unit is provided to the base member to apply a driving force to the chain guide.

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