Transmission unit for human-powered vehicle

Abstract

The present invention addresses the problem of providing a transmission unit for a human-powered vehicle capable of appropriately imparting propulsive force to the human-powered vehicle. The transmission unit is a transmission unit for a human-powered vehicle, and is provided with: a support part; the driving shaft receives manual driving force and is provided with a first shaft center; an output unit provided to the drive shaft; a motor having a rotor and a stator; a transmission mechanism configured to transmit a motor torque of the motor to the output portion; and a motor output shaft connected to the rotor and having a second axis different from the first axis, the transmission mechanism including a first transmission portion having a planetary gear mechanism, at least a portion of the planetary gear mechanism being configured to rotate around the second axis, and a second transmission portion configured to rotate around the second axis. When viewed from a first direction orthogonal to the second axis, the second axis overlaps with the motor.

Description

Technical Field

[0001] This disclosure relates to a transmission unit for a human-powered vehicle. Background Technology

[0002] Patent Document 1 discloses an example of a transmission unit for a manually driven vehicle equipped with a motor, wherein the motor imparts propulsion to the manually driven vehicle. The torque of the motor in Patent Document 1 is transmitted to the crankshaft of the manually driven vehicle.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: Japanese Patent Application Publication No. 2014-196036. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] One of the purposes of this disclosure is to provide a transmission unit for a human-powered vehicle that can appropriately impart propulsion to the human-powered vehicle.

[0008] means for solving problems

[0009] According to a first aspect of this disclosure, the transmission unit is a transmission unit for a human-powered vehicle, wherein the transmission unit comprises: a support portion; a drive shaft that receives human driving force and has a first axis; an output portion disposed on the drive shaft; a motor having a rotor and a stator; a transmission mechanism configured to transmit the motor torque of the motor to the output portion; and a motor output shaft connected to the rotor and having a second axis different from the first axis, the transmission mechanism including a first transmission portion having a planetary gear mechanism, at least a portion of the planetary gear mechanism being configured to rotate about the second axis, and, when viewed from a first direction orthogonal to the second axis, at least a portion of the planetary gear mechanism overlapping the motor.

[0010] According to the transmission unit of the first aspect, the transmission mechanism can appropriately transmit motor torque to the drive shaft via a first transmission section including a planetary gear mechanism. Therefore, the transmission unit can appropriately impart propulsion force to a manually driven vehicle. According to the transmission unit of the first aspect, since at least a portion of the planetary gear mechanism is configured to rotate about a second axis, and when viewed from a first direction orthogonal to the second axis, at least a portion of the planetary gear mechanism overlaps with the motor, it is possible to facilitate miniaturization of the transmission unit in the direction along the first axis.

[0011] In the transmission unit according to the second aspect of the disclosed first aspect, when viewed from the first direction, at least a portion of the planetary gear mechanism overlaps with the rotor.

[0012] According to the transmission unit of the second aspect, since at least a portion of the planetary gear mechanism overlaps with the rotor when viewed from the first direction, it is possible to help to miniaturize the transmission unit in the direction along the first axis.

[0013] In the transmission unit according to the second aspect of the present disclosure, the stator is disposed radially outward of the rotor, and at least a portion of the planetary gear mechanism is disposed radially inward of the rotor.

[0014] According to the transmission unit of the third aspect, since at least a portion of the planetary gear mechanism is arranged radially inside the rotor, it is possible to help to miniaturize the transmission unit in the direction along the first axis.

[0015] In the transmission unit according to the fourth aspect of the second aspect of this disclosure, the rotor is disposed radially outside the stator, and at least a portion of the planetary gear mechanism is disposed radially inside the stator.

[0016] According to the transmission unit of the fourth aspect, since at least a portion of the planetary gear mechanism is arranged radially inside the stator, it is possible to help to miniaturize the transmission unit in the direction along the first axis.

[0017] In the transmission unit of the fifth aspect according to any one of the first to fourth aspects of this disclosure, when viewed from the first direction, at least a portion of the planetary gear mechanism overlaps with the rotor on the radially outer side of the motor.

[0018] According to the transmission unit of the fifth aspect, since at least a portion of the planetary gear mechanism overlaps with the rotor on the radially outer side of the motor when viewed from the first direction, it is possible to help to miniaturize the transmission unit in the direction along the first axis.

[0019] In the transmission unit of the sixth aspect according to any one of the first to fifth aspects of this disclosure, the transmission mechanism further includes a transmission shaft having a third axis that is different from either the first axis or the second axis.

[0020] According to the transmission unit of the sixth aspect, at least a portion of the transmission mechanism can be located on a transmission shaft different from the drive shaft and the motor output shaft.

[0021] In the transmission unit according to the sixth and seventh aspects of this disclosure, the transmission mechanism further includes a second transmission section having: a first transmission gear that transmits torque from the planetary gear mechanism; and a second transmission gear that engages with the first transmission gear and is disposed on the transmission shaft.

[0022] According to the transmission unit in the seventh aspect, the second transmission unit is able to properly transmit the torque transmitted from the planetary gear mechanism.

[0023] In the transmission unit according to the seventh aspect of the present disclosure, the first transmission gear has a first pitch circle diameter, and the second transmission gear has a second pitch circle diameter, the second pitch circle diameter being larger than the first pitch circle diameter.

[0024] According to the transmission unit in the eighth aspect, since the second transmission unit is a speed reducer, the second transmission unit can properly transmit the motor torque.

[0025] In the transmission unit of the seventh or eighth aspect or the ninth aspect of this disclosure, the transmission mechanism further includes a third transmission part having: a third transmission gear disposed on the transmission shaft; and a fourth transmission gear engaging with the third transmission gear and disposed on the output part.

[0026] According to the transmission unit in the ninth aspect, the third transmission unit is able to properly transmit the torque transmitted from the planetary gear mechanism.

[0027] In the transmission unit of the ninth and tenth aspects of this disclosure, the third transmission gear has a third pitch circle diameter, and the fourth transmission gear has a fourth pitch circle diameter, the fourth pitch circle diameter being larger than the third pitch circle diameter.

[0028] According to the transmission unit in the tenth aspect, since the third transmission unit is a speed reducer, the third transmission unit can properly transmit the motor torque.

[0029] In the transmission unit of any of the sixth to tenth aspects of this disclosure, the second shaft and the third shaft are parallel to the first shaft.

[0030] According to the transmission unit of the eleventh aspect, the motor output shaft and the drive shaft can be arranged parallel to each other. According to the transmission unit of the eleventh aspect, the transmission shaft and the drive shaft can be arranged parallel to each other.

[0031] In the transmission unit of the twelfth aspect of the first aspect of this disclosure, the planetary gear mechanism includes: a sun gear that receives rotational torque from the motor output shaft; a ring gear disposed on the support in a manner that prevents rotation relative to the support; planetary gears disposed between the sun gear and the ring gear and transmitting the rotational torque of the sun gear; and a gear carrier that supports the planetary gears and outputs the rotational torque to the output portion.

[0032] According to the transmission unit in the twelfth aspect, since the planetary gear mechanism is a reducer, it can properly transmit the motor torque.

[0033] In the transmission unit of the thirteenth aspect of the first aspect of this disclosure, when viewed from the first direction, the entire planetary gear mechanism overlaps with the motor.

[0034] According to the transmission unit of the thirteenth aspect, since the entire planetary gear mechanism overlaps with the motor when viewed from the first direction, it is possible to help to miniaturize the transmission unit in the direction along the first axis.

[0035] In the transmission unit of the fourteenth aspect of the first aspect of the present disclosure, the planetary gear mechanism includes: a sun gear; a ring gear; a planetary gear disposed between the sun gear and the ring gear; and a gear carrier supporting the planetary gear, wherein, when viewed from the first direction, at least one of the sun gear, the planetary gear, and the ring gear at least partially overlaps with the motor.

[0036] According to the transmission unit of the fourteenth aspect, since at least one of the sun gear, planet gear, and ring gear overlaps at least partially with the motor when viewed from the first direction, it is possible to help to miniaturize the transmission unit in the direction along the first axis.

[0037] In the transmission unit according to the fourteenth and fifteenth aspects of this disclosure, when viewed from the first direction, at least a portion of the gear ring overlaps with the motor.

[0038] According to the transmission unit of the fifteenth aspect, since at least a portion of the gear ring overlaps with the motor when viewed from the first direction, it is possible to help to miniaturize the transmission unit in the direction along the first axis.

[0039] In the transmission unit of the sixteenth aspect of the first aspect of the present disclosure, the transmission unit further includes a first bearing that rotatably supports the motor output shaft, and at least a portion of the first bearing overlaps with the rotor when viewed from the first direction.

[0040] According to the transmission unit of the sixteenth aspect, since at least a portion of the first bearing overlaps with the rotor when viewed from the first direction, it is possible to help to miniaturize the transmission unit in the direction along the first axis.

[0041] In the transmission unit of the seventeenth aspect according to any one of the first to sixteenth aspects of this disclosure, the motor has a first maximum outer diameter and the output portion has a second maximum outer diameter, wherein the first maximum outer diameter is larger than the second maximum outer diameter.

[0042] According to the transmission unit of the seventeenth aspect, the planetary gear mechanism can be configured such that at least a portion of the planetary gear mechanism overlaps with a motor having a first maximum outer diameter that is larger than the second maximum outer diameter of the output section.

[0043] In the transmission unit of the eighteenth aspect according to any one of the first to seventeenth aspects of this disclosure, the transmission unit further includes a circuit board disposed at a position away from the motor output shaft in a second direction parallel to the second axis.

[0044] According to the transmission unit in the eighteenth aspect, the circuit board can be positioned in a position that is difficult to interfere with the motor output shaft.

[0045] In the transmission unit according to the eighteenth and nineteenth aspects of this disclosure, the transmission unit further includes a motor rotation state detection unit that detects the rotation state of the motor output shaft, and the circuit board includes a predetermined portion disposed opposite to the motor output shaft in the second direction, wherein the motor rotation state detection unit is disposed in the predetermined portion.

[0046] According to the transmission unit of the nineteenth aspect, since the motor rotation state detection unit is provided in a predetermined part opposite to the motor output shaft of the circuit board, the motor rotation state detection unit can properly detect the rotation state of the motor.

[0047] In the transmission unit of the twentieth aspect according to any one of the first to nineteenth aspects of this disclosure, the transmission unit further includes a human-powered driving force detection unit that detects the human-powered driving force applied to the human-powered vehicle.

[0048] According to the transmission unit in aspect 20, the human driving force can be detected by the human driving force detection unit.

[0049] The transmission unit according to aspect twenty-one of this disclosure is a transmission unit for a human-powered vehicle, wherein the transmission unit comprises: a support portion; a drive shaft that receives human driving force and has a first axis; an output portion disposed on the drive shaft; a motor having a rotor and a stator; a transmission mechanism configured to transmit the motor torque of the motor to the output portion; and a motor output shaft connected to the rotor and having a second axis different from the first axis, the transmission mechanism including a first transmission portion having a reduction mechanism, at least a portion of the reduction mechanism being configured to rotate about the second axis, and, when viewed from a first direction orthogonal to the second axis, at least a portion of the reduction mechanism overlapping the motor.

[0050] According to the transmission unit of aspect twenty-one, the transmission mechanism can appropriately transmit motor torque to the drive shaft via a first transmission section including a reduction mechanism. Therefore, the transmission unit can appropriately impart propulsion force to a manually driven vehicle. According to the transmission unit of aspect twenty-one, since at least a portion of the reduction mechanism is configured to rotate about a second axis, and when viewed from a first direction orthogonal to the second axis, at least a portion of the reduction mechanism overlaps with the motor, it is possible to contribute to the miniaturization of the transmission unit in the direction along the first axis.

[0051] Invention Effects

[0052] The transmission unit for a human-powered vehicle disclosed herein can appropriately impart propulsion to the human-powered vehicle. Attached Figure Description

[0053] Figure 1 This is a side view of a human-powered vehicle including the transmission unit for a human-powered vehicle according to the embodiment.

[0054] Figure 2 yes Figure 1 Side view of the transmission unit used in a human-powered vehicle;

[0055] Figure 3 This is the view from one side of the drive shaft's axial direction with the housing omitted. Figure 2 A side view of a vehicle with a human-powered transmission unit.

[0056] Figure 4 This is the view from the other side of the drive shaft's axial direction with the housing omitted. Figure 2 A side view of a vehicle with a human-powered transmission unit.

[0057] Figure 5 yes Figure 2 A plan view of the transmission unit for a human-powered vehicle with the housing omitted;

[0058] Figure 6 yes Figure 4 A cross-sectional view of the transmission unit for a manually driven vehicle at line D6-D6.

[0059] Figure 7 yes Figure 6 An enlarged cross-sectional view of the transmission unit used in a human-powered vehicle.

[0060] Figure 8 yes Figure 6 An enlarged cross-sectional view of the transmission unit used in a human-powered vehicle.

[0061] Figure 9 This is an enlarged sectional view of the transmission unit for a human-powered vehicle, a modified example.

[0062] Figure 10 This is an enlarged sectional view of the transmission unit for a human-powered vehicle, as shown in the modified example. Detailed Implementation

[0063] <Implementation Method>

[0064] Reference Figures 1 to 8 The transmission unit 40 for a human-powered vehicle will be described below. A human-powered vehicle is a means of transportation that has at least one wheel and can be driven by at least human power. For example, human-powered vehicles include various types of bicycles such as mountain bikes, road bikes, city bikes, freight bikes, push bikes, and recumbent bikes. The number of wheels a human-powered vehicle has is not limited. Human-powered vehicles include, for example, unicycles and vehicles with two or more wheels. Human-powered vehicles are not limited to vehicles that can be driven solely by human power. Human-powered vehicles include electric bicycles (E-bikes) that are propelled not only by human power but also by the driving force of an electric motor. Electric bicycles (E-bikes) include electric-assisted bicycles that are propelled with the assistance of an electric motor. Hereinafter, in each embodiment, the human-powered vehicle will be described as an electric-assisted bicycle.

[0065] like Figure 1 As shown, for example, the human-powered vehicle 10 includes a crank 12 for inputting human driving force. For example, the human-powered vehicle 10 includes wheels 14 and a body 16. For example, the wheels 14 include a drive wheel 14A and a driven wheel 14B. For example, the drive wheel 14A is the rear wheel of the human-powered vehicle 10. For example, the driven wheel 14B is the front wheel of the human-powered vehicle 10. The drive wheel 14A can be the front wheel of the human-powered vehicle 10. In the case where the drive wheel 14A is the front wheel, the driven wheel 14B is the rear wheel.

[0066] For example, the vehicle body 16 includes a frame 18. For example, the crank 12 includes: a crankshaft 12A rotatable relative to the frame 18; and crank arms 12B and 12C, respectively disposed at axial ends of the crankshaft 12A. Crank arm 12B is connected to a pedal 20A. Crank arm 12C is connected to a pedal 20B. For example, the drive wheel 14A is driven by rotation of the crank 12. For example, the drive wheel 14A is supported on the frame 18.

[0067] For example, crank 12 is connected to drive wheel 14A via drive mechanism 22. For example, drive mechanism 22 includes a first rotating body 24 connected to crankshaft 12A. For example, crankshaft 12A is connected via... Figure 6 The first one-way clutch 38 shown is connected to the first rotating body 24. The crankshaft 12A can be connected to the first rotating body 24 in a manner that allows it to rotate integrally with the first rotating body 24. For example, the first rotating body 24 may include a sprocket, a pulley, or a bevel gear.

[0068] For example, the drive mechanism 22 also includes a second rotating body 26 and a connecting member 28. The connecting member 28 transmits the rotational force of the first rotating body 24 to the second rotating body 26. For example, the connecting member 28 includes a chain, belt, or drive shaft.

[0069] For example, the second rotating body 26 is connected to the drive wheel 14A. For example, the second rotating body 26 includes a sprocket, pulley, or bevel gear. For example, in the power transmission path of human-powered drive, a second one-way clutch is provided between the second rotating body 26 and the drive wheel 14A. For example, the second one-way clutch is configured to cause the drive wheel 14A to rotate forward when the second rotating body 26 rotates forward. For example, the second one-way clutch is configured to allow relative rotation between the second rotating body 26 and the drive wheel 14A when the second rotating body 26 rotates backward.

[0070] For example, the front wheel is mounted to the frame 18 via the front fork 30. The handlebars 34 are connected to the front fork 30 via the stem 32. In this embodiment, the rear wheel is connected to the crank 12 via the drive mechanism 22. In this embodiment, the rear wheel is the drive wheel 14A, and the front wheel is the driven wheel 14B.

[0071] For example, the human-powered vehicle 10 also includes a battery 36. For example, the battery 36 includes one or more battery elements. For example, the battery elements include rechargeable batteries. For example, the battery 36 is configured to supply power to the transmission unit 40. For example, the battery 36 is communicatively connected to the transmission unit 40 via wired or wireless means. For example, when the battery 36 is communicatively connected to the transmission unit 40 via a wired connection, the battery 36 is configured to communicate with the transmission unit 40 via conductive materials such as circuit board wiring and wires. When the battery 36 is communicatively connected to the transmission unit 40 via a wired connection, the battery 36 may be configured to communicate with the transmission unit 40 via a fiber optic cable. For example, the battery 36 can communicate with the transmission unit 40 via power line communication (PLC), CAN (Controller Area Network), or UART (Universal Asynchronous Receiver / Transmitter).

[0072] like Figures 2 to 8 As shown, the transmission unit 40 for a human-powered vehicle includes, for example, a support 42, a drive shaft 44, an output 46, a motor 48, a transmission mechanism 50, and a motor output shaft 52.

[0073] like Figure 6 As shown, for example, the transmission unit 40 includes a housing 54. For example, the housing 54 forms a storage space SA. For example, the housing 54 at least partially houses at least one of the drive shaft 44, output section 46, motor 48, transmission mechanism 50, and motor output shaft 52 within the storage space SA. For example, the housing 54 is made of a metallic material. For example, the metallic material includes at least one of aluminum alloy and magnesium alloy. The housing 54 may include a synthetic resin instead of a metallic material, or may include a synthetic resin in addition to a metallic material.

[0074] For example, the support portion 42 is integrally formed with at least a portion of the housing 54. For example, the support portion 42 at least partially supports at least one of the drive shaft 44, the motor 48, the transmission mechanism 50, and the motor output shaft 52.

[0075] For example, the transmission unit 40 is detachably mounted to the frame 18. The housing 54 has at least one mounting portion 54A. The at least one mounting portion 54A is located on the outer peripheral portion of the housing 54. The at least one mounting portion 54A includes at least one of a hole and an internal thread. For example, the hole and the internal thread extend in a direction parallel to the drive shaft 44. For example, the housing 54 has three mounting portions 54A. For example, fasteners such as bolts engage with at least one mounting portion 54A and a portion on the frame 18 corresponding to the at least one mounting portion 54A, thereby mounting the transmission unit 40 to the frame 18.

[0076] For example, support portion 42 includes a first support portion 42X and a second support portion 42Y. For example, the first support portion 42X includes a wall portion in the housing 54 on one side along the axial direction X of the drive shaft 44. For example, the second support portion 42Y includes a wall portion in the housing 54 on the other side along the axial direction X of the drive shaft 44. For example, the second support portion 42Y is mounted to the first support portion 42X by fasteners such as bolts. For example, the first support portion 42X is mounted to the second support portion 42Y, thereby forming a storage space SA between the first support portion 42X and the second support portion 42Y. For example, support portion 42 includes a third support portion 42Z. For example, the third support portion 42Z is ​​disposed in the storage space SA. For example, the third support portion 42Z supports at least a portion of the motor output shaft 52 and at least a portion of the transmission mechanism 50.

[0077] For example, drive shaft 44 receives human-powered driving force and has a first axis C1. For example, drive shaft 44 is crankshaft 12A. As long as it is a shaft that receives human-powered driving force, drive shaft 44 can be a shaft different from crankshaft 12A. In the case where drive shaft 44 is a shaft different from crankshaft 12A, drive shaft 44 can be a shaft connected to crankshaft 12A but away from crankshaft 12A. For example, drive shaft 44 is formed of metal. For example, drive shaft 44 is a hollow shaft. Drive shaft 44 can be a solid shaft. For example, drive shaft 44 is supported on support portion 42 in a manner that allows it to rotate relative to support portion 42. For example, in the radial direction of drive shaft 44, a bearing is provided between drive shaft 44 and support portion 42 to rotatably support drive shaft 44.

[0078] like Figures 6 to 8 As shown, the support portion 42 is provided with a first hole 42A and a second hole 42B. For example, the first hole 42A is provided in the first support portion 42X. For example, the second hole 42B is provided in the second support portion 42Y. For example, the drive shaft 44 has a first drive shaft end 44A and a second drive shaft end 44B located on the opposite side of the first drive shaft end 44A in the axial direction X of the drive shaft 44. For example, the drive shaft 44 passes through the first hole 42A and the second hole 42B. For example, the first drive shaft end 44A and the second drive shaft end 44B are exposed outside the support portion 42. For example, the first drive shaft end 44A is exposed from the first hole 42A to the outside of the support portion 42. For example, the second drive shaft end 44B is exposed from the second hole 42B to the outside of the support portion 42.

[0079] For example, an output portion 46 is disposed on a drive shaft 44. For example, an output portion 46 is a hollow shaft. For example, at least a portion of the drive shaft 44 is inserted into the output portion 46. For example, the output portion 46 is made of a metallic material. The output portion 46 has a first output end 46A and a second output end 46B located on the opposite side of the first output end 46A along the axial direction X of the drive shaft 44. For example, the output portion 46 includes a connecting portion 46C. For example, the connecting portion 46C is disposed on the second output end 46B of the output portion 46. For example, the connecting portion 46C is disposed on the outer peripheral surface of the second output end 46B of the output portion 46. For example, the connecting portion 46C has a spline. For example, a first rotating body 24 is mounted on the connecting portion 46C.

[0080] For example, at least a portion of the output portion 46 is disposed in the second hole 42B. For example, the output portion 46 is supported on the second support portion 42Y in a manner that allows it to rotate relative to the second support portion 42Y. For example, a bearing capable of rotatably supporting the output portion 46 relative to the second support portion 42Y is provided between the output portion 46 and the second support portion 42Y in the radial direction of the output portion 46. The output portion 46 is disposed about the drive shaft 44. For example, the output portion 46 is connected to the drive shaft 44 via a first one-way clutch 38. For example, the first one-way clutch 38 is configured to rotate the output portion 46 when the drive shaft 44 rotates in a first rotational direction B1. For example, the first one-way clutch 38 is configured to allow relative rotation between the drive shaft 44 and the output portion 46 when the drive shaft 44 rotates in a second rotational direction B2 opposite to the first rotational direction B1.

[0081] For example, motor 48 is configured to provide propulsion to the manually driven vehicle 10. Motor 48 is configured to transmit rotational force via motor output shaft 52 to at least one of the power transmission path from pedals 20A and 20B to drive wheel 14A and the driven wheel 14B. The power transmission path from pedals 20A and 20B to drive wheel 14A includes drive wheel 14A. For example, motor 48 is mounted on the frame 18 of the manually driven vehicle 10. For example, motor 48 is configured to transmit rotational force to output section 46 via motor output shaft 52.

[0082] For example, motor 48 includes an electric motor. For example, motor 48 is a radial air gap type motor. For example, motor 48 is an internal rotor type motor. For example, motor 48 is a brushless motor. Motor 48 can be an axial air gap type motor.

[0083] For example, motor 48 has a rotor 56 and a stator 58. For example, stator 58 is disposed radially outside of rotor 56. For example, stator 58 is mounted in housing 54. For example, stator 58 is formed in an annular shape. For example, the portion of housing 54 that houses stator 58 is integrally formed with other portions of housing 54. The portion of housing 54 that houses stator 58 may also be separately formed from other portions of housing 54.

[0084] For example, rotor 56 is configured to rotate relative to stator 58. For example, rotor 56 includes magnets. For example, rotor 56 is hollow. For example, rotor 56 has a through hole 56A through which motor output shaft 52 passes. For example, rotor 56 includes an outer peripheral portion 56B, an inner peripheral portion 56C, and a middle portion 56D.

[0085] For example, when viewed from the direction of rotation along the axis of rotation of rotor 56, the outer peripheral portion 56B is formed in an annular shape. For example, the outer peripheral surface of the outer peripheral portion 56B is provided opposite to the stator 58. For example, a magnet is mounted on the outer peripheral portion 56B. The magnet can be magnetized on the outer peripheral portion 56B. For example, the inner peripheral portion 56C is formed in an annular shape when viewed from the direction of rotation along the axis of rotation of rotor 56. For example, a through hole 56A is provided in the inner peripheral portion 56C. The intermediate portion 56D connects the outer peripheral portion 56B and the inner peripheral portion 56C. For example, the intermediate portion 56D extends radially in the rotor 56. For example, when viewed from the direction of rotation along the axis of rotation of rotor 56, the intermediate portion 56D is formed in a rod-like or plate-like shape. For example, rotor 56 includes a plurality of intermediate portions 56D. In this embodiment, rotor 56 includes five intermediate portions 56D. For example, the plurality of intermediate portions 56D are arranged at equal intervals in the circumferential direction of rotor 56. Rotor 56 may include only one intermediate portion 56D.

[0086] For example, the dimension of the intermediate portion 56D in the direction along the rotation axis of the rotor 56 is less than or equal to the dimension of the inner peripheral portion 56C in the direction along the rotation axis of the rotor 56. For example, the dimension of the intermediate portion 56D in the direction along the rotation axis of the rotor 56 is less than or equal to the dimension of the outer peripheral portion 56B in the direction along the rotation axis of the rotor 56. For example, the dimension of the inner peripheral portion 56C in the direction along the rotation axis of the rotor 56 is smaller than the dimension of the outer peripheral portion 56B in the direction along the rotation axis of the rotor 56. For example, in the direction along the rotation axis of the rotor 56, the intermediate portion 56D is disposed between one end and the other end of the outer peripheral portion 56B in the direction along the rotation axis of the rotor 56. For example, in the direction along the rotation axis of the rotor 56, the intermediate portion 56D is disposed between one end and the other end of the inner peripheral portion 56C in the direction along the rotation axis of the rotor 56.

[0087] For example, such as Figure 2As shown, motor 48 has a first maximum outer diameter RA. For example, the first maximum outer diameter RA is substantially the same as the maximum outer diameter of rotor 56. For example, output section 46 has a second maximum outer diameter RB. The second maximum outer diameter RB is substantially the same as the maximum diameter of fourth transmission gear 84B. For example, the first maximum outer diameter RA is larger than the second maximum outer diameter RB.

[0088] like Figures 6 to 8 As shown, for example, the motor output shaft 52 is connected to the rotor 56 and has a second shaft C2 that is different from the first shaft C1. For example, the rotational axis of the rotor 56 is the same as the second shaft C2. For example, the rotational torque of the rotor 56 is transmitted to the outside of the motor 48 via the motor output shaft 52. In this specification, the motor 48 does not include the motor output shaft 52. In this specification, the motor output shaft 52 is a component different from the components constituting the motor 48. For example, the motor output shaft 52 is mounted on the rotor 56 in a manner that allows it to rotate integrally with the rotor 56.

[0089] In this embodiment, the direction orthogonal to the second axis C2 will be described as the first direction A1. In this embodiment, the direction parallel to the second axis C2 will be described as the second direction A2. For example, the motor output shaft 52 extends in the second direction A2. For example, the motor output shaft 52 has a first motor output shaft end 52A and a second motor output shaft end 52B located on the opposite side of the first motor output shaft end 52A in the second direction A2. For example, the first motor output shaft end 52A has a through hole 56A. For example, the second motor output shaft end 52B is a free end.

[0090] For example, the transmission unit 40 also includes a first bearing 60 that rotatably supports the motor output shaft 52. For example, the first bearing 60 rotatably supports the end 52A of the first motor output shaft. For example, the first bearing 60 includes a radial bearing. For example, the first bearing 60 includes an inner wheel, an outer wheel, and a plurality of rotating bodies disposed between the inner wheel and the outer wheel.

[0091] For example, a first bearing 60 is disposed on a first support portion 42X. For example, when viewed from a first direction A1, at least a portion of the first bearing 60 overlaps with the rotor 56. For example, at least a portion of the first bearing 60 is disposed in a hollow portion of the rotor 56. At least a portion of the first bearing 60 is disposed between the inner circumferential surface of the stator 58 and the motor output shaft 52. At least a portion of the first bearing 60 is disposed between the inner circumferential surface of the annular rotor 56 and the motor output shaft 52.

[0092] For example, the transmission unit 40 also includes a second bearing 62 that rotatably supports the motor output shaft 52. For example, the second bearing 62 rotatably supports the intermediate portion between the first motor output shaft end 52A and the second motor output shaft end 52B. For example, the second bearing 62 includes a radial bearing. For example, the second bearing 62 includes an inner wheel, an outer wheel, and a plurality of rotating bodies disposed between the inner and outer wheels. The inner diameter of the inner wheel of the second bearing 62 is smaller than the inner diameter of the inner wheel of the first bearing 60. The outer diameter of the outer wheel of the second bearing 62 is smaller than the outer diameter of the outer wheel of the first bearing 60.

[0093] For example, when viewed from the first direction A1, at least a portion of the second bearing 62 overlaps with the stator 58. For example, at least a portion of the second bearing 62 is disposed in a hollow portion of the rotor 56. At least a portion of the second bearing 62 is disposed between the inner circumferential surface of the annular stator 58 and the motor output shaft 52. For example, the second bearing 62 is disposed between the gear carrier 76 and the motor output shaft 52 in the first direction A1. For example, the second bearing 62 is disposed between the sun gear 70 and the gear carrier 76 in the second direction A2.

[0094] For example, the transmission mechanism 50 is configured to transmit the motor torque of the motor 48 to the output unit 46. For example, the transmission mechanism 50 is provided on the transmission path of the motor torque from the motor 48 to the output unit 46. For example, the transmission mechanism 50 is configured to reduce the speed of the motor 48 and transmit the motor torque to the output unit 46. For example, the transmission mechanism 50 is configured to reduce the speed of the motor 48 by two or more stages and transmit the motor torque to the output unit 46. In this embodiment, the transmission mechanism 50 is configured to reduce the speed of the motor 48 by three stages and transmit the motor torque to the output unit 46.

[0095] like Figures 6 to 8 As shown, for example, the transmission mechanism 50 includes a first transmission section 64. For example, the first transmission section 64 has a reduction mechanism 66. For example, the reduction mechanism 66 is configured to reduce the rotational speed of the motor 48 and output it. For example, at least a portion of the reduction mechanism 66 is configured to rotate about a second axis C2, and when viewed from a first direction A1 orthogonal to the second axis C2, at least a portion of the reduction mechanism 66 overlaps with the motor 48.

[0096] For example, the first transmission unit 64 has a planetary gear mechanism 68. For example, the planetary gear mechanism 68 is configured as a speed reducer. For example, the speed reduction mechanism 66 includes the planetary gear mechanism 68. For example, the planetary gear mechanism 68 is configured such that the rotational speed of the output rotating element connected to the output unit 46 in the planetary gear mechanism 68 is slower than the rotational speed of the input rotating element connected to the rotor 56 in the planetary gear mechanism 68. For example, at least a portion of the planetary gear mechanism 68 is supported by the support unit 42.

[0097] like Figure 2 , Figure 4 ,as well as Figure 7 As shown, for example, at least a portion of the planetary gear mechanism 68 is disposed radially inside the rotor 56. For example, at least a portion of the planetary gear mechanism 68 is disposed radially inside the outer periphery 56B of the rotor 56. For example, the planetary gear mechanism 68 includes a portion disposed adjacent to the inner periphery 56C of the rotor 56 in the second direction A2, and a portion disposed not adjacent to the inner periphery 56C of the rotor 56. For example, at least a portion of the planetary gear mechanism 68 is disposed adjacent to the middle portion 56D of the rotor 56 in the second direction A2. At least a portion of the planetary gear mechanism 68 is disposed radially outside the inner periphery 56C of the rotor 56. For example, the size of the planetary gear mechanism 68 disposed radially inside the outer periphery 56B of the rotor 56 in the second direction A2 is larger than the size of the planetary gear mechanism 68 disposed radially outside the inner periphery 56C of the rotor 56.

[0098] like Figures 6 to 8 As shown, for example, at least a portion of the planetary gear mechanism 68 is configured to rotate about a second axis C2, and when viewed from a first direction A1 orthogonal to the second axis C2, at least a portion of the planetary gear mechanism 68 overlaps with the motor 48. For example, when viewed from the first direction A1, at least a portion of the planetary gear mechanism 68 overlaps with the stator 58. For example, at least a portion of the planetary gear mechanism 68 is disposed radially inside the stator 58.

[0099] For example, when viewed from the first direction A1, at least a portion of the planetary gear mechanism 68 overlaps with the rotor 56. For example, when viewed from the first direction A1, at least a portion of the planetary gear mechanism 68 overlaps with the outer periphery 56B of the rotor 56. For example, when viewed from the first direction A1, at least a portion of the planetary gear mechanism 68 overlaps with the inner periphery 56C of the rotor 56. For example, the planetary gear mechanism 68 includes a portion that overlaps with the middle portion 56D of the rotor 56 when viewed from the first direction A1, and a portion that does not overlap with the middle portion 56D of the rotor 56.

[0100] In this embodiment, when viewed from the first direction A1, a portion of the planetary gear mechanism 68 overlaps with the motor 48. When viewed from the first direction A1, the entire planetary gear mechanism 68 may overlap with the motor 48. For example, when the entire planetary gear mechanism 68 overlaps with the motor 48 when viewed from the first direction A1, the planetary gear mechanism 68 and the rotor 56 are configured such that, when viewed from the first direction A1, the entire planetary gear mechanism 68 is located radially inside the outer periphery 56B of the rotor 56.

[0101] For example, planetary gear mechanism 68 includes a sun gear 70, a ring gear 72, a planetary gear 74 disposed between the sun gear 70 and the ring gear 72, and a gear carrier 76 supporting the planetary gear 74.

[0102] For example, the sun gear 70 is disposed on the motor output shaft 52. For example, the sun gear 70 receives rotational torque from the motor output shaft 52. The sun gear 70 may be integrally formed with the motor output shaft 52, or it may be separately formed from the motor output shaft 52 but rotated integrally with it. In this embodiment, the sun gear 70 is separately formed from the motor output shaft 52. For example, the sun gear 70 is mounted on the motor output shaft 52 in contact with a stepped portion disposed on the motor output shaft 52. For example, the sun gear 70 is disposed between the rotor 56 and the second bearing 62 in the second direction A2. For example, the sun gear 70 is configured to be adjacent to the inner circumference 56C of the rotor 56 in the second direction A2. For example, the sun gear 70 meshes with the planetary gear 74. The axis of the sun gear 70 is substantially the same as the second axis C2 of the motor output shaft 52.

[0103] For example, the gear ring 72 meshes with the planetary gear 74. For example, the gear ring 72 is disposed on the support portion 42 in a manner that prevents it from rotating relative to the support portion 42. For example, the gear ring 72 is supported by the third support portion 42Z. For example, the gear ring 72 is mounted on the third support portion 42Z. For example, the gear ring 72 includes a flange portion 72A projecting radially outward. For example, the gear ring 72 includes a gear ring mounting portion 72B for mounting on the third support portion 42Z. For example, the gear ring mounting portion 72B is disposed on the flange portion 72A. For example, the gear ring 72 is mounted on the third support portion 42Z by bolts or the like. The gear ring 72 may be integrally formed with the support portion 42.

[0104] For example, planetary gear 74 is disposed between sun gear 70 and ring gear 72, and transmits the rotational torque of sun gear 70. For example, planetary gear 74 is one of a plurality of planetary gears 74. For example, each of the plurality of planetary gears 74 is spaced apart about a second axis C2 of motor output shaft 52. For example, the number of the plurality of planetary gears 74 is more than 2 and less than 8. The number of the plurality of planetary gears 74 is, for example, 4.

[0105] For example, the gear carrier 76 supports the planetary gear 74 and outputs rotational torque to the output section 46. For example, the gear carrier 76 includes a gear carrier pin support 76A, a gear carrier shaft 76B, and a gear carrier pin 76C. The gear carrier pin support 76A and the gear carrier shaft 76B are integrally formed. The rotational axis of the gear carrier 76 is substantially the same as the second axis C2 of the motor output shaft 52. For example, the gear carrier shaft 76B is arranged around the motor output shaft 52.

[0106] For example, the gear carrier pin 76C rotatably supports the planetary gear 74 via a bearing. For example, the gear carrier pin 76C is one of a plurality of gear carrier pins 76C. For example, the plurality of gear carrier pins 76C are arranged at intervals around a second axis C2 of the motor output shaft 52 in the gear carrier pin support portion 76A. The number of the plurality of gear carrier pins 76C corresponds to the number of the plurality of planetary gears 74.

[0107] For example, when viewed from the first direction A1, at least one of the sun gear 70, planet gear 74, and ring gear 72 at least partially overlaps with the motor 48. For example, when viewed from the first direction A1, at least a portion of the sun gear 70 overlaps with the motor 48. For example, when viewed from the first direction A1, at least a portion of the planet gear 74 overlaps with the motor 48. For example, when viewed from the first direction A1, at least a portion of the gear carrier 76 overlaps with the motor 48. For example, when viewed from the first direction A1, at least a portion of the ring gear 72 overlaps with the motor 48. In cases where at least one of the gear carrier 76, sun gear 70, planet gear 74, and ring gear 72 at least partially overlaps with the motor 48 when viewed from the first direction A1, the remaining gears may not overlap with the motor 48 when viewed from the first direction A1.

[0108] For example, when viewed from the first direction A1, at least one of the gear carrier 76, the sun gear 70, the planetary gear 74, and the ring gear 72 at least partially overlaps with the stator 58. For example, when viewed from the first direction A1, at least one of the gear carrier 76, the sun gear 70, the planetary gear 74, and the ring gear 72 at least partially overlaps with the rotor 56.

[0109] like Figures 6 to 8 As shown, for example, when viewed from the first direction A1, at least a portion of the sun gear 70 overlaps with the stator 58. In this embodiment, when viewed from the first direction A1, the entire sun gear 70 overlaps with the stator 58. When viewed from the first direction A1, only a portion of the sun gear 70 may overlap with the stator 58. For example, at least a portion of the sun gear 70 is disposed radially inward of the stator 58.

[0110] For example, when viewed from the first direction A1, at least a portion of the sun gear 70 overlaps with the rotor 56. For example, when viewed from the first direction A1, at least a portion of the sun gear 70 overlaps with the outer periphery 56B of the rotor 56. In this embodiment, when viewed from the first direction A1, only a portion of the sun gear 70 overlaps with the outer periphery 56B of the rotor 56. When viewed from the first direction A1, the entire sun gear 70 may overlap with the outer periphery 56B of the rotor 56. For example, when viewed from the first direction A1, the sun gear 70 does not overlap with the inner periphery 56C of the rotor 56. For example, when viewed from the first direction A1, at least a portion of the sun gear 70 may overlap with the inner periphery 56C of the rotor 56.

[0111] For example, when viewed from the first direction A1, at least a portion of the gear ring 72 overlaps with the stator 58. In this embodiment, when viewed from the first direction A1, the entire gear ring 72 overlaps with the stator 58. When viewed from the first direction A1, only a portion of the gear ring 72 may overlap with the stator 58. For example, at least a portion of the gear ring 72 is disposed radially inside the stator 58.

[0112] For example, when viewed from the first direction A1, at least a portion of the toothed ring 72 overlaps with the rotor 56. For example, when viewed from the first direction A1, at least a portion of the toothed ring 72 overlaps with the outer periphery 56B of the rotor 56. In this embodiment, when viewed from the first direction A1, only a portion of the toothed ring 72 overlaps with the outer periphery 56B of the rotor 56. When viewed from the first direction A1, the entire toothed ring 72 may overlap with the outer periphery 56B of the rotor 56. For example, at least a portion of the flange portion 72A is disposed in the second direction A2 at a position adjacent to the outer periphery 56B of the rotor 56. For example, when viewed from the first direction A1, the toothed ring 72 does not overlap with the inner periphery 56C of the rotor 56. For example, when viewed from the first direction A1, at least a portion of the toothed ring 72 may overlap with the inner periphery 56C of the rotor 56.

[0113] For example, when viewed from the first direction A1, at least a portion of the planetary gear 74 overlaps with the stator 58. In this embodiment, when viewed from the first direction A1, the entire planetary gear 74 overlaps with the stator 58. When viewed from the first direction A1, only a portion of the planetary gear 74 may overlap with the stator 58. At least a portion of the planetary gear 74 is disposed radially inward of the stator 58.

[0114] For example, when viewed from the first direction A1, at least a portion of the planetary gear 74 overlaps with the rotor 56. For example, when viewed from the first direction A1, at least a portion of the planetary gear 74 overlaps with the outer periphery 56B of the rotor 56. In this embodiment, when viewed from the first direction A1, only a portion of the planetary gear 74 overlaps with the outer periphery 56B of the rotor 56. When viewed from the first direction A1, the entire planetary gear 74 may overlap with the outer periphery 56B of the rotor 56. For example, when viewed from the first direction A1, the planetary gear 74 does not overlap with the inner periphery 56C of the rotor 56. For example, when viewed from the first direction A1, at least a portion of the planetary gear 74 may overlap with the inner periphery 56C of the rotor 56.

[0115] For example, when viewed from the first direction A1, at least a portion of the gear carrier 76 overlaps with the stator 58. In this embodiment, when viewed from the first direction A1, only a portion of the gear carrier 76 overlaps with the stator 58. When viewed from the first direction A1, the entire gear carrier 76 may overlap with the stator 58. For example, at least a portion of the gear carrier 76 is disposed radially inside the stator 58.

[0116] For example, when viewed from the first direction A1, at least a portion of the gear carrier 76 overlaps with the rotor 56. For example, when viewed from the first direction A1, at least a portion of the gear carrier 76 overlaps with the outer periphery 56B of the rotor 56. In this embodiment, when viewed from the first direction A1, only a portion of the gear carrier 76 overlaps with the outer periphery 56B of the rotor 56. When viewed from the first direction A1, the entire gear carrier 76 may overlap with the outer periphery 56B of the rotor 56. For example, when viewed from the first direction A1, at least a portion of the gear carrier 76 overlaps with the inner periphery 56C of the rotor 56. In this embodiment, when viewed from the first direction A1, only a portion of the gear carrier pin 76C of the gear carrier 76 overlaps with the inner periphery 56C of the rotor 56. When viewed from the first direction A1, the gear carrier 76 may not overlap with the inner periphery 56C of the rotor 56.

[0117] like Figure 2 and Figure 7As shown, for example, planetary gear mechanism 68 has a maximum outer diameter RX. For example, the maximum outer diameter RX is substantially the same as the maximum outer diameter of gear ring 72. For example, motor 48 has a minimum inner diameter RY. For example, the minimum inner diameter RY is substantially the same as the diameter of the inner circumferential surface of rotor 56. For example, the maximum outer diameter RX of planetary gear mechanism 68 is smaller than the minimum inner diameter RY of motor 48. For example, the diameter of the root circle of gear ring 72 is smaller than the diameter of the inner circumferential surface of outer circumferential portion 56B of rotor 56. For example, the maximum outer diameter of gear ring 72 is larger than the diameter of the inner circumferential surface of outer circumferential portion 56B of rotor 56. For example, the maximum outer diameter of gear ring 72 can be less than or equal to the diameter of the inner circumferential surface of outer circumferential portion 56B of rotor 56. For example, the outer diameter of the toothed portion of gear ring 72 is smaller than the diameter of the inner circumferential surface of outer circumferential portion 56B of rotor 56.

[0118] like Figure 2 as well as Figures 6 to 8 As shown, for example, the transmission mechanism 50 also includes a transmission shaft 78 having a third shaft C3 that is different from either the first shaft C1 or the second shaft C2. The second shaft C2 and the third shaft C3 are parallel to the first shaft C1. For example, the drive shaft 44, the motor output shaft 52, and the transmission shaft 78 are arranged in the same plane. When viewed from the second direction A2, the first shaft C1, the second shaft C2, and the third shaft C3 are arranged in a straight line. For example, the transmission shaft 78 is arranged side by side with the motor 48 in the first direction A1. For example, the distance from the drive shaft 44 to the motor output shaft 52 is greater than the distance from the drive shaft 44 to the transmission shaft 78.

[0119] For example, the transmission shaft 78 is a hollow shaft. The transmission shaft 78 can also be a solid shaft. For example, the transmission shaft 78 is supported by a second support portion 42Y and a third support portion 42Z. For example, in the second direction A2, the transmission shaft 78 has a first transmission shaft end 78A and a second transmission shaft end 78B located on the opposite side to the first transmission shaft end 78A. For example, the first transmission shaft end 78A is supported by the third support portion 42Z. For example, in the first direction A1, a bearing is provided between the first transmission shaft end 78A and the third support portion 42Z. For example, the second transmission shaft end 78B is supported by the second support portion 42Y. For example, a bearing is provided between the second transmission shaft end 78B and the second support portion 42Y.

[0120] For example, the transmission shaft 78 includes a first portion 78X and a second portion 78Y. For example, the first portion 78X includes a first transmission shaft end 78A. For example, the second portion 78Y includes a second transmission shaft end 78B. For example, the first portion 78X and the second portion 78Y are integrally formed. For example, the maximum outer diameter of the first portion 78X is larger than the maximum outer diameter of the second portion 78Y.

[0121] For example, the transmission mechanism 50 further includes a second transmission section 80. The second transmission section 80, for example, includes: a first transmission gear 80A that transmits torque from the planetary gear mechanism 68; and a second transmission gear 80B that engages with the first transmission gear 80A and is disposed on the transmission shaft 78. For example, the first transmission gear 80A is arranged around the gear carrier shaft portion 76B. The axis of the first transmission gear 80A is substantially the same as the second axis C2 of the motor output shaft 52.

[0122] For example, the second transmission gear 80B is configured around the transmission shaft 78. The axis of the second transmission gear 80B is substantially the same as the third axis C3 of the transmission shaft 78.

[0123] For example, the first transmission gear 80A has a first pitch circle diameter R1. For example, the second transmission gear 80B has a second pitch circle diameter R2. For example, the second pitch circle diameter R2 is larger than the first pitch circle diameter R1. Because the second pitch circle diameter R2 is larger than the first pitch circle diameter R1, the rotational speed of the second transmission gear 80B is slower than the rotational speed of the first transmission gear 80A. For example, the first transmission gear 80A and the second transmission gear 80B each include helical gears. The first transmission gear 80A and the second transmission gear 80B may each include spur gears.

[0124] For example, the transmission unit 40 also includes a third one-way clutch 82. For example, the third one-way clutch 82 is disposed on the power transmission path between the motor 48 and the drive shaft 44. For example, the third one-way clutch 82 is disposed in the second direction A2 between the second transmission gear 80B and the transmission shaft 78. For example, the second transmission gear 80B is connected to the transmission shaft 78 via the third one-way clutch 82. The third one-way clutch 82 can be disposed between the rotor 56 and the motor output shaft 52. The third one-way clutch 82 can be disposed in any of the transmission mechanisms 50. The transmission unit 40 may not include the third one-way clutch 82. For example, if the transmission unit 40 does not include the third one-way clutch 82, the motor 48 is configured to be regenerative.

[0125] For example, the third one-way clutch 82 is configured to allow relative rotation between the drive shaft 44 and the second transmission gear 80B when the drive shaft 44 rotates in the first rotational direction B1 and the rotation of the motor output shaft 52 stops. For example, the third one-way clutch 82 includes at least one of a roller clutch, a wedge clutch, and a claw clutch.

[0126] For example, the transmission mechanism 50 further includes a third transmission section 84. For example, the third transmission section 84 has a third transmission gear 84A and a fourth transmission gear 84B. For example, the third transmission gear 84A is disposed on the transmission shaft 78. For example, in the second direction A2, the distance from the third transmission gear 84A to the second support portion 42Y is shorter than the distance from the second transmission gear 80B to the second support portion 42Y. The third transmission gear 84A can be connected to the transmission shaft 78 via a one-way clutch, or it can be connected to the transmission shaft 78 in a manner that allows it to rotate integrally with the transmission shaft 78. For example, the fourth transmission gear 84B engages with the third transmission gear 84A and is disposed on the output portion 46. For example, the fourth transmission gear 84B is formed on the outer peripheral surface of the output portion 46 at the first output end 46A of the output portion 46. The fourth transmission gear 84B can be mounted on the output portion 46 in a manner that allows it to be separately formed from the output portion 46 and rotate integrally with the output portion 46.

[0127] For example, the third transmission gear 84A has a third pitch circle diameter R3. For example, the fourth transmission gear 84B has a fourth pitch circle diameter R4. For example, the fourth pitch circle diameter R4 is larger than the third pitch circle diameter R3. Because the fourth pitch circle diameter R4 is larger than the third pitch circle diameter R3, the rotational speed of the fourth transmission gear 84B is slower than the rotational speed of the third transmission gear 84A. For example, the third transmission gear 84A and the fourth transmission gear 84B constitute a helical gear. The third transmission gear 84A and the fourth transmission gear 84B can also constitute a spur gear.

[0128] like Figures 3 to 8 As shown, for example, the transmission unit 40 also includes a circuit board 86. For example, power from the battery 36 is supplied to the circuit board 86. The transmission unit 40 may have a circuit board different from the circuit board 86. For example, the circuit board 86 is disposed in the storage space SA. For example, the circuit board 86 is configured such that its mounting surface is substantially parallel to the first direction A1. For example, in the second direction A2 parallel to the second axis C2, the circuit board 86 is disposed at a position away from the motor output shaft 52. For example, the circuit board 86 is configured to be disposed opposite to the second motor output shaft end 52B of the motor output shaft 52. For example, the stator 58 includes a plurality of coils. For example, the stator 58 includes a plurality of connection terminals electrically connected to the plurality of coils. For example, the plurality of connection terminals extend along the second direction A2 and are electrically connected to the circuit board 86.

[0129] For example, the circuit board 86 is configured to overlap with the motor 48 when viewed from the second direction A2. For example, the circuit board 86 is configured to overlap with the planetary gear mechanism 68 when viewed from the second direction A2. For example, the circuit board 86 is configured not to overlap with the drive shaft 44 when viewed from the second direction A2. For example, the circuit board 86 is configured not to overlap with at least a portion of the transmission mechanism 50 when viewed from the second direction A2. For example, the circuit board 86 is configured not to overlap with the third transmission gear 84A when viewed from the second direction A2. For example, the circuit board 86 is configured not to overlap with the fourth transmission gear 84B when viewed from the second direction A2.

[0130] For example, the transmission unit 40 also includes a control unit. For example, the control unit is disposed on the circuit board 86. For example, the control unit includes a calculation processing device that executes a predetermined control program. The calculation processing device includes, for example, a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). The calculation processing device can be disposed in multiple locations that are separate from each other. The control unit may include one or more microcomputers.

[0131] For example, the transmission unit 40 also includes a storage unit. For example, the storage unit is disposed on the circuit board 86. For example, the storage unit stores various control programs and information used for various control processes. For example, the storage unit includes non-volatile memory and volatile memory. For example, the non-volatile memory includes at least one of ROM (Read-Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), and flash memory. For example, the volatile memory includes RAM (Random Access Memory).

[0132] For example, the transmission unit 40 also includes a drive circuit for the motor 48. For example, the drive circuit is disposed on the circuit board 86. For example, the drive circuit includes an inverter circuit. For example, the drive circuit controls the power supplied from the battery 36 to the motor 48. For example, the drive circuit can be communicatively connected to the control unit via wired or wireless means. For example, when the drive circuit is communicatively connected to the control unit via a wired connection, the drive circuit is configured to communicate with the control unit via circuit board wiring and conductors such as wires. When the drive circuit is communicatively connected to the control unit via a wired connection, the drive circuit can be configured to communicate with the control unit via an optical fiber cable. For example, the drive circuit drives the motor 48 according to a control signal from the control unit.

[0133] For example, the transmission unit 40 also includes a motor rotation state detection unit 88, which detects the rotation state of the motor output shaft 52. For example, the motor rotation state detection unit 88 outputs a signal based on the rotation of the motor output shaft 52. For example, the motor rotation state detection unit 88 includes a magnetic sensor. For example, the motor rotation state detection unit 88 is configured to detect a magnet disposed on the motor output shaft 52. For example, the magnet is disposed at the second motor output shaft end 52B of the motor output shaft 52. For example, the circuit board 86 includes a predetermined portion 86A disposed opposite to the motor output shaft 52 in the second direction A2. For example, the motor rotation state detection unit 88 is disposed in the predetermined portion 86A. For example, the motor rotation state detection unit 88 is connected to the control unit via a conductive wire, cable, or wireless communication device. For example, the motor rotation state detection unit 88 and the control unit are disposed on a single circuit board 86.

[0134] For example, the transmission unit 40 also includes a human-powered driving force detection unit 90, which detects the human-powered driving force applied to the human-powered vehicle 10. For example, the human-powered driving force detection unit 90 includes a strain gauge sensor. The strain gauge sensor includes a strain meter. The human-powered driving force detection unit 90 may include a magnetostrictive sensor. For example, the human-powered driving force detection unit 90 is disposed on the outer peripheral surface of the drive shaft 44 or around the outer peripheral surface of the drive shaft 44. For example, the human-powered driving force detection unit 90 is disposed on a circuit board different from the circuit board 86 on which the control unit is disposed. For example, the human-powered driving force detection unit 90 is connected to the control unit via a conductive wire, cable, or wireless communication device. The human-powered driving force detection unit 90 may be disposed on one or both of crank arms 12B and 12C. When the human-powered driving force detection unit 90 is disposed on one or both of crank arms 12B and 12C, the human-powered driving force detection unit 90 includes, for example, a strain gauge sensor.

[0135] For example, the control unit is configured to calculate the rotational speed of the motor 48 based on the signal from the motor rotational state detection unit 88. For example, the control unit is configured to control the motor 48 based on the signal from the motor rotational state detection unit 88. For example, the control unit is configured to control the motor 48 based on the signal from the manual drive force detection unit 90. For example, the control unit is configured to change the auxiliary force of the motor 48 based on the signal from the manual drive force detection unit 90.

[0136] Figures 6 to 8 The transmission mechanism 50 shown reduces the rotational speed of the motor 48 via the first transmission section 64, the second transmission section 80, and the third transmission section 84, and transmits the motor torque to the output section 46. Since the transmission mechanism 50 reduces the rotational speed of the motor 48 via multiple transmission sections and transmits the motor torque to the output section 46, it can appropriately impart propulsion force to the manually driven vehicle 10. Because the planetary gear mechanism 68 is located on a different shaft than the drive shaft 44, the transmission unit 40 can bring the rear wheel axle closer to the crankshaft 12A compared to the case where the planetary gear mechanism 68 is located on the drive shaft 44. Since the planetary gear mechanism 68 overlaps with the motor 48 when viewed from the first direction A1, the size of the transmission unit 40 in the second direction A2 can be reduced.

[0137] <Variation Example>

[0138] The descriptions related to the embodiments are examples of possible arrangements of the transmission unit for a manually driven vehicle according to this disclosure, and are not intended to limit the arrangements. For example, the transmission unit for a manually driven vehicle according to this disclosure can take the form of variations of the embodiments shown below, as well as combinations of at least two non-contradictory variations. In the following variations, the same reference numerals as in the embodiments are used for parts common to the embodiments, and their descriptions are omitted.

[0139] ·like Figure 9 As shown, motor 48 can be an external rotor type motor. For example, Figure 9 The rotor 56 is disposed radially outward of the stator 58. For example, at least a portion of the planetary gear mechanism 68 is disposed radially inward of the stator 58. For example, when viewed from the first direction A1, at least a portion of the planetary gear mechanism 68 overlaps with the stator 58.

[0140] ·like Figure 10 As shown, when viewed from the first direction A1, at least a portion of the planetary gear mechanism 68 may overlap with the rotor 56 radially outward from the motor 48. In this variation, the motor 48 may be an inner rotor type motor or an outer rotor type motor.

[0141] • The transmission mechanism 50 may have a speed increaser. In this variation, for example, at least one of the second transmission section 80 and the third transmission section 84 may be configured as a speed increaser. For example, the transmission mechanism 50 may have a speed increaser in addition to at least one of the second transmission section 80 and the third transmission section 84. In this variation, for example, the transmission mechanism 50 may be configured to combine the deceleration mechanism 66 and the speed increaser to reduce the rotational speed of the motor 48 and transmit the motor torque to the output section 46.

[0142] The reduction mechanism 66 may replace the planetary gear mechanism 68 by comprising a first outer peripheral gear disposed on the outer periphery 56B of the rotor 56 and a second outer peripheral gear meshing with the first outer peripheral gear and having a pitch circle diameter larger than that of the first outer peripheral gear. For example, the second outer peripheral gear is disposed on the transmission shaft 78. In this modified example, for example, the first outer peripheral gear is configured to at least partially overlap with the motor 48 when viewed from the first direction A1.

[0143] The planetary gear mechanism 68 can be structured such that the rotational torque input to the sun gear 70 is output from the ring gear 72. In this variation, for example, the ring gear 72 is configured to output the rotational torque to the drive shaft 44. In this variation, for example, the gear carrier 76 is configured not to rotate relative to the sun gear 70.

[0144] • The planetary gear mechanism 68 can be a speed increaser. In this variation, for example, the transmission mechanism 50 can be configured to combine the planetary gear mechanism 68, which is configured as a speed increaser, with the second transmission section 80 and the third transmission section 84, which are configured as speed reducers, to reduce the speed of the motor 48 and transmit the motor torque to the output section 46.

[0145] • At least one of the second transmission section 80 and the third transmission section 84 may be omitted. The transmission mechanism 50 may also have a transmission section that is different from the first transmission section 64, the second transmission section 80, and the third transmission section 84, in addition to the first transmission section 64, the second transmission section 80, and the third transmission section 84.

[0146] At least one of the second transmission section 80 and the third transmission section 84 may include a chain and a sprocket instead of a gear. At least one of the second transmission section 80 and the third transmission section 84 may include a pulley and a belt.

[0147] • The transmission mechanism 50 may include an additional transmission shaft in addition to the transmission shaft 78. For example, when the transmission mechanism 50 includes an additional transmission shaft, the transmission mechanism 50 includes a fourth transmission section provided on the additional transmission shaft in addition to the planetary gear mechanism 68, the second transmission section 80, and the third transmission section 84.

[0148] • At least one of the second shaft C2 and the third shaft C3 may be configured not to be parallel to the first shaft C1. In this variation, for example, the second shaft C2 and the third shaft C3 may be configured to be orthogonal to the first shaft C1. In this variation, for example, the motor 48 may be configured such that the second shaft C2 and the third shaft C3 are orthogonal to the axial direction X of the drive shaft 44 and the first shaft C1.

[0149] At least a portion of the first bearing 60 may be configured not to overlap with the rotor 56 when viewed from the first direction A1.

[0150] The circuit board 86 can be configured not to overlap with the motor output shaft 52 in the second direction A2.

[0151] The circuit board 86 can be configured to overlap with the transmission axis 78 in the second direction A2.

[0152] • The first maximum outer diameter RA can be less than or equal to the second maximum outer diameter RB.

[0153] The motor rotation status detection unit 88 can be located in a different place than the specified part 86A. In this modified example, for example, the motor rotation status detection unit 88 is located radially outward of the motor 48. In general, as long as the motor rotation status detection unit 88 is located in a part that can detect the rotation status of the motor 48, the configuration of the motor rotation status detection unit 88 in the transmission unit 40 can be appropriately changed.

[0154] • The transmission unit 40 may not have a human-powered driving force detection unit 90. In the case where the transmission unit 40 does not have a human-powered driving force detection unit 90, a detection unit for detecting human-powered driving force may be provided on the crank arm 12B and crank arm 12C or on the pedal 20A and pedal 20B.

[0155] As used in this specification, the term "at least one" refers to "more than one" of the desired options. For example, if there are two options, the term "at least one" as used in this specification refers to "only one option" or "both of the two options." As another example, if there are three or more options, the term "at least one" as used in this specification refers to "only one option" or "any combination of two or more options."

[0156] The ordinal numbers for “first” and “second” used in this specification are only used to distinguish identical names and have no special meaning.

[0157] Symbol explanation:

[0158] 10…Human-driven vehicle, 40…Transmission unit, 42…Support unit, 44…Drive shaft, 46…Output unit, 48…Motor, 50…Transmission mechanism, 52…Motor output shaft, 56…Rotor, 58…Stator, 60…First bearing, 64…First transmission unit, 66…Reduction mechanism, 68…Planetary gear mechanism, 70…Sun gear, 72…Ring gear, 74…Planetary gear, 76…Gear carrier, 78…Transmission shaft, 80…Second transmission unit, 80A…First transmission gear, 80B…Second transmission gear, 84…Third transmission unit, 84A…Third transmission gear, 84B…Fourth transmission gear, 86…Circuit board, 86A…Specified part, 88…Motor rotation status detection unit, 90…Human-driven force detection unit.

Claims

1. A transmission unit for a manually driven vehicle, wherein, This transmission unit has the following features: Support section; A drive shaft that receives human driving force and has a first axis; An output section is provided on the drive shaft; An electric motor has a rotor and a stator; A transmission mechanism configured to transmit the motor torque of the motor to the output unit; and The motor output shaft is connected to the rotor and has a second axis that is different from the first axis. The transmission mechanism includes a first transmission section, which has a planetary gear mechanism. At least a portion of the planetary gear mechanism is configured to rotate about the second axis, and when viewed from a first direction orthogonal to the second axis, at least a portion of the planetary gear mechanism overlaps with the motor.

2. The transmission unit according to claim 1, wherein, When viewed from the first direction, at least a portion of the planetary gear mechanism overlaps with the rotor.

3. The transmission unit according to claim 2, wherein, The stator is positioned radially outside the rotor. At least a portion of the planetary gear mechanism is disposed radially inside the rotor.

4. The transmission unit according to claim 2, wherein, The rotor is positioned radially outside the stator. At least a portion of the planetary gear mechanism is disposed radially inside the stator.

5. The transmission unit according to claim 1, wherein, When viewed from the first direction, at least a portion of the planetary gear mechanism overlaps with the rotor on the radially outer side of the motor.

6. The transmission unit according to claim 1, wherein, The transmission mechanism further includes a transmission shaft having a third axis that is different from either the first axis or the second axis.

7. The transmission unit according to claim 6, wherein, The transmission mechanism further includes a second transmission section, which has: a first transmission gear that transmits torque from the planetary gear mechanism; and a second transmission gear that engages with the first transmission gear and is disposed on the transmission shaft.

8. The transmission unit according to claim 7, wherein, The first transmission gear has a first pitch circle diameter. The second transmission gear has a second pitch circle diameter. The diameter of the second section circle is larger than the diameter of the first section circle.

9. The transmission unit according to claim 7, wherein, The transmission mechanism further includes a third transmission section, which has: a third transmission gear disposed on the transmission shaft; and a fourth transmission gear engaged with the third transmission gear and disposed on the output section.

10. The transmission unit according to claim 9, wherein, The third transmission gear has a third pitch circle diameter. The fourth transmission gear has a fourth pitch circle diameter. The diameter of the fourth section circle is larger than the diameter of the third section circle.

11. The transmission unit according to claim 6, wherein, The second axis and the third axis are parallel to the first axis.

12. The transmission unit according to claim 1, wherein, The planetary gear mechanism includes: The sun gear receives rotational torque from the output shaft of the motor; A gear ring, which is disposed on the support in a manner that prevents it from rotating relative to the support; A planetary gear, disposed between the sun gear and the ring gear, and transmitting the rotational torque of the sun gear; and The gear carrier supports the planetary gears and outputs rotational torque to the output section.

13. The transmission unit according to claim 1, wherein, When viewed from the first direction, the entire planetary gear mechanism overlaps with the motor.

14. The transmission unit according to claim 1, wherein, The planetary gear mechanism includes: Sun gear; Gear ring; Planetary gears, disposed between the sun gear and the ring gear; and The gear carrier supports the planetary gears. When viewed from the first direction, at least one of the sun gear, the planetary gear, and the ring gear at least partially overlaps with the motor.

15. The transmission unit according to claim 14, wherein, When viewed from the first direction, at least a portion of the gear ring overlaps with the motor.

16. The transmission unit according to claim 1, wherein, The transmission unit also includes a first bearing that rotatably supports the motor output shaft. When viewed from the first direction, at least a portion of the first bearing overlaps with the rotor.

17. The transmission unit according to claim 1, wherein, The motor has a first maximum outer diameter. The output section has a second maximum outer diameter. The first maximum outer diameter is larger than the second maximum outer diameter.

18. The transmission unit according to claim 1, wherein, The transmission unit also includes a circuit board. The circuit board is positioned away from the motor output shaft in a second direction parallel to the second axis.

19. The transmission unit according to claim 18, wherein, The transmission unit also includes a motor rotation state detection unit, which detects the rotation state of the motor output shaft. The circuit board includes a defined portion disposed in the second direction opposite to the motor output shaft. The motor rotation status detection unit is located in the specified section.

20. The transmission unit according to claim 1, wherein, The transmission unit also includes a human driving force detection unit, which detects the human driving force applied to the human-powered vehicle.

21. A transmission unit for a manually driven vehicle, wherein, This transmission unit has the following features: Support section; A drive shaft that receives human driving force and has a first axis; An output section is provided on the drive shaft; An electric motor has a rotor and a stator; A transmission mechanism configured to transmit the motor torque of the motor to the output unit; and The motor output shaft, which is connected to the rotor, has a second axis that is different from the first axis. The transmission mechanism includes a first transmission section with a deceleration mechanism. At least a portion of the deceleration mechanism is configured to rotate about the second axis, and when viewed from a first direction orthogonal to the second axis, at least a portion of the deceleration mechanism overlaps with the motor.

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