DRIVE UNIT FOR A MUSCLE-POWERED VEHICLE

Abstract

A drive unit for a muscle-powered vehicle comprises a support, a drive shaft, an output section, a motor, a transmission mechanism, and a motor output shaft. The drive shaft receives the human propulsive force and includes a first axis. The output section is located on the drive shaft. The motor contains a rotor and a stator. The transmission mechanism is configured to transfer the motor's torque to the output section. The motor output shaft is connected to the rotor and includes a second axis, distinct from the first. The transmission mechanism includes a first transmission unit containing a planetary gear mechanism. At least a portion of the planetary gear mechanism is configured to rotate about the second axis and overlaps, viewed in a first direction orthogonal to the second axis, the motor.

Description

[0001] This application claims priority over Japanese patent application JP 2024-144215, filed on August 26, 2024. The entire disclosure of Japanese patent application JP 2024-144215 is hereby incorporated into this application by reference.

[0002] The present disclosure relates to a drive unit for a muscle-powered vehicle.

[0003] Japanese patent publication No. 2014-196036 discloses an example of a drive unit for a human-powered vehicle, which includes a motor that provides propulsive force to the human-powered vehicle. Patent document 1 describes how the torque of the motor is transmitted to a crank axle of the human-powered vehicle. SUMMARY OF THE REVELATION

[0004] One object of the present disclosure is to provide a drive unit for a muscle-powered vehicle which preferably supplies a propulsive force to the muscle-powered vehicle.

[0005] A drive unit according to a first aspect of the present disclosure is provided for a muscle-powered vehicle. The drive unit comprises a support, a drive shaft, an output section, a motor, a transmission mechanism, and a motor output shaft. The drive shaft receives the human driving force and includes a first axle. The output section is provided on the drive shaft. The motor comprises a rotor and a stator. The transmission mechanism is configured to transmit the torque of the motor to the output section. The motor output shaft is connected to the rotor and includes a second axle, which is distinct from the first axle. The transmission mechanism includes a first transmission unit, which contains a planetary gear mechanism.At least part of the planetary gear mechanism is set up to rotate around the second axis and overlaps, viewed in a first direction that is orthogonal to the second axis, the motor.

[0006] In the drive unit according to the first aspect, the transmission mechanism preferably transmits the motor torque to the drive shaft via the first transmission unit, which contains the planetary gear mechanism. Accordingly, the drive unit preferably supplies a propulsive force to the muscle-powered vehicle. In the drive unit according to the first aspect, at least a part of the planetary gear mechanism is arranged to rotate about the second axis, viewed in the first direction orthogonal to the second axis, and overlaps the motor. This reduces the size of the drive unit in a direction parallel to the first axis.

[0007] According to a second aspect of the present disclosure, the drive unit is arranged according to the first aspect, so that, viewed in the first direction, at least part of the planetary gear mechanism overlaps the rotor.

[0008] In the drive unit described by the second aspect, at least part of the planetary gear overlaps the rotor when viewed in the first direction. This reduces the size of the drive unit in a direction parallel to the first axis.

[0009] According to a third aspect of the present disclosure, the drive unit is configured according to the second aspect such that the stator is arranged on a radially outer side of the rotor. At least part of the planetary gear mechanism is arranged on a radially inner side of the rotor.

[0010] In the drive unit according to the third aspect, at least part of the planetary gear mechanism is arranged on the radially inner side of the rotor. This reduces the size of the drive unit in a direction parallel to the first axis.

[0011] According to a fourth aspect of the present disclosure, the drive unit is configured according to the second aspect such that the rotor is arranged on a radially outer side of the stator. At least part of the planetary gear mechanism is arranged on a radially inner side of the stator.

[0012] In the drive unit according to the fourth aspect, at least part of the planetary gear mechanism is arranged on the radially inner side of the stator. This reduces the size of the drive unit in a direction parallel to the first axis.

[0013] According to a fifth aspect of the present disclosure, the drive unit is arranged according to one of the first to fourth aspects such that at least part of the planetary gear mechanism, viewed in the first direction, overlaps the rotor on a radially outer side of the motor.

[0014] In the drive unit according to the fifth aspect, at least part of the planetary gear mechanism overlaps the rotor on the radially outer side of the motor when viewed in the first direction. This reduces the size of the drive unit in a direction parallel to the first axis.

[0015] According to a sixth aspect of the present disclosure, the drive unit is arranged according to one of the first to fifth aspects, such that the transmission mechanism further includes a transmission shaft which contains a third axis that is different from the first axis and the second axis.

[0016] In the drive unit according to the sixth aspect, at least part of the transmission mechanism is provided on the transmission shaft, which is different from the drive shaft and the motor output shaft.

[0017] According to a seventh aspect of the present disclosure, the drive unit is arranged according to the sixth aspect such that the transmission mechanism further comprises a second transmission unit containing a first gear and a second gear. The first gear receives torque from the planetary gear mechanism. The second gear meshes with the first gear and is provided on the transmission shaft.

[0018] In the drive unit according to the seventh aspect, the second transmission unit transmits the torque received from the planetary gear mechanism in a preferred manner.

[0019] According to an eighth aspect of the present disclosure, the drive unit is arranged according to the seventh aspect such that the first gear has a first pitch circle diameter, the second gear has a second pitch circle diameter, and the second pitch circle diameter is larger than the first pitch circle diameter.

[0020] In the drive unit according to the eighth aspect, the second transmission unit is a speed reducer. Therefore, the second transmission unit transmits the motor torque in a preferential manner.

[0021] According to a ninth aspect of the present disclosure, the drive unit is arranged according to the seventh or eighth aspect such that the transmission mechanism further comprises a third transmission unit containing a third gear and a fourth gear. The third gear is provided on the transmission shaft. The fourth gear engages with the third gear and is provided on the output section.

[0022] In the drive unit according to the ninth aspect, the third transmission unit transmits the torque transmitted by the planetary gear transmission mechanism in a preferred manner.

[0023] According to a tenth aspect of the present disclosure, the drive unit is arranged according to the ninth aspect such that the third gear has a third pitch circle diameter, the fourth gear has a fourth pitch circle diameter, and the fourth pitch circle diameter is larger than the third pitch circle diameter.

[0024] In the drive unit according to the tenth aspect, the third transmission unit is a speed reducer. Therefore, the third transmission unit transmits the motor torque in a preferential manner.

[0025] According to an eleventh aspect of the present disclosure, the drive unit is arranged according to one of the sixth to tenth aspects so that the second axis and the third axis are parallel to the first axis.

[0026] In the drive unit according to the eleventh aspect, the motor output shaft is arranged parallel to the input shaft. In the drive unit according to the eleventh aspect, the transmission shaft is arranged parallel to the input shaft.

[0027] According to a twelfth aspect of the present disclosure, the drive unit is configured according to aspects one through eleven such that the planetary gear mechanism includes a sun gear, a ring gear, a planet gear, and a support. The sun gear receives the torque from the motor output shaft. The ring gear is mounted on the support in a non-rotatable manner relative to the support. The planet gear receives the torque from the sun gear and is positioned between the sun gear and the ring gear. The support supports the planet gear and transmits the torque to the output section.

[0028] In the drive unit according to the twelfth aspect, the planetary gear mechanism acts as a speed reducer. Therefore, the planetary gear mechanism transmits the motor torque in a preferential manner.

[0029] According to a thirteenth aspect of the present revelation, the drive unit is arranged according to one of the first to twelfth aspects so that the planetary gear mechanism, viewed in the first direction, completely overlaps the motor.

[0030] In the drive unit according to the thirteenth aspect, the planetary gear mechanism, viewed in the first direction, completely overlaps the motor. This reduces the size of the drive unit in a direction parallel to the first axis.

[0031] According to a fourteenth aspect of the present disclosure, the drive unit is arranged according to one of the first to eleventh aspects such that the planetary gear mechanism includes a sun gear, a ring gear, a planet gear, and a support. The planet gear is provided between the sun gear and the ring gear. The support supports the planet gear. At least one of the sun gear, the planet gear, and the ring gear overlaps, viewed in the first direction, at least partially, the motor.

[0032] In the drive unit according to the fourteenth aspect, at least one of the sun gear, the planet gear, and the ring gear overlaps, at least partially, the motor when viewed in the first direction. This reduces the size of the drive unit in a direction parallel to the first axis.

[0033] According to a fifteenth aspect of the present disclosure, the drive unit is arranged according to the fourteenth aspect so that, viewed in the first direction, at least part of the ring gear overlaps the motor.

[0034] In the drive unit according to the fifteenth aspect, at least part of the ring gear overlaps the motor when viewed in the first direction. This reduces the size of the drive unit in a direction parallel to the first axis.

[0035] According to a sixteenth aspect of the present disclosure, the drive unit further comprises, according to aspects one through fifteen, a first bearing that rotatably supports the motor output shaft. At least a part of the first bearing overlaps, viewed in the first direction, the rotor.

[0036] In the drive unit according to the sixteenth aspect, at least part of the first bearing, viewed in the first direction, overlaps the rotor. This reduces the size of the drive unit in a direction parallel to the first axis.

[0037] According to a seventeenth aspect of the present disclosure, the drive unit is arranged according to aspects one through sixteenth such that the motor has a first maximum outer diameter, the output section has a second maximum outer diameter, and the first maximum diameter is larger than the second maximum diameter.

[0038] In the drive unit according to the seventeenth aspect, the planetary gear mechanism is arranged so that at least part of the planetary gear mechanism overlaps the motor, which has the first maximum outer diameter that is larger than the second maximum outer diameter of the output section.

[0039] According to an eighteenth aspect of the present disclosure, the drive unit further comprises a printed circuit board according to aspects one through seventeen. The printed circuit board is arranged at a position separated from the motor output shaft in a second direction, which runs parallel to the second axis.

[0040] In the drive unit according to the eighteenth aspect, the circuit board is arranged in a position where it is unlikely to interfere with the motor output shaft.

[0041] According to a nineteenth aspect of the present disclosure, the drive unit according to the eighteenth aspect further comprises a motor rotation state detector that detects a rotation state of the motor output shaft. The circuit board includes a predetermined part that faces the motor output shaft in the second direction. The motor rotation state detector is provided on the predetermined part.

[0042] In the drive unit according to the nineteenth aspect, the motor rotation state detector is provided on the predetermined part of the circuit board facing the motor output shaft. Therefore, the motor rotation state detector detects the rotation state of the motor in a preferred manner.

[0043] According to a twentieth aspect of the present disclosure, the drive unit further comprises, according to one of the first to nineteenth aspects, a human propulsion force detector which detects the human propulsion force supplied to the muscle-powered vehicle.

[0044] In the drive unit according to the twentieth aspect, the human driving force detector detects the human driving force.

[0045] A drive unit according to a twenty-first aspect of the present disclosure is provided for a muscle-powered vehicle. The drive unit comprises a support, a drive shaft, an output section, a motor, a transmission mechanism, and a motor output shaft. The drive shaft receives the human driving force and includes a first axle. The output section is provided on the drive shaft. The motor comprises a rotor and a stator. The transmission mechanism is configured to transmit the torque of the motor to the output section. The motor output shaft is connected to the rotor and includes a second axle, distinct from the first axle. The transmission mechanism includes a first transmission unit, which incorporates a speed reduction mechanism.At least part of the speed reduction mechanism is set up to rotate around the second axis and overlaps, viewed in a first direction that is orthogonal to the second axis, the motor.

[0046] In the drive unit according to aspect twenty-first, the transmission mechanism preferably transmits the motor torque to the drive shaft via the first transmission unit, which contains the speed reduction mechanism. Accordingly, the drive unit preferably supplies a driving force to the muscle-powered vehicle. In the drive unit according to aspect twenty-first, at least part of the speed reduction mechanism is arranged to rotate about the second axis and, viewed in the first direction orthogonal to the second axis, overlaps the motor. This reduces the size of the drive unit in a direction parallel to the first axis.

[0047] The drive unit for a muscle-powered vehicle according to the present disclosure preferably supplies a driving force to the muscle-powered vehicle. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a side view of a muscle-powered vehicle with a drive unit for a muscle-powered vehicle according to one embodiment. Fig. 2 is a side view of the Fig. 1. Drive unit shown for a muscle-powered vehicle. Fig. 3 is a side view of the Fig. 2 Drive unit shown for a muscle-powered vehicle without a housing, seen from one side in relation to an axial direction of a drive shaft. Fig. 4 is a side view of the in Fig. 2 Drive unit shown for a muscle-powered vehicle without a housing, seen from the other side in relation to the axial direction of the drive shaft. Fig. 5 is a top view of the in Fig. 2 Drive unit shown for a muscle-powered vehicle without a housing. Fig. Figure 6 is a cross-sectional view of the drive unit for a muscle-powered vehicle along the [line / path / etc.]. Fig. 4 shown line D6-D6. Fig. Figure 7 is an enlarged cross-sectional view of the [unclear text]. Fig. 6 shown drive unit for a muscle-powered vehicle. Fig. 8 is an enlarged cross-sectional view of the in Fig. 6 shown drive unit for a muscle-powered vehicle. Fig. Figure 9 is an enlarged cross-sectional view of a drive unit for a muscle-powered vehicle of a modified example. Fig. Figure 10 is an enlarged cross-sectional view of a drive unit for a muscle-powered vehicle of another modified example. FORM OF DISCLOSURE

[0048] A drive unit 40 for a muscle-powered vehicle is now described with reference to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. Section 8 describes a muscle-powered vehicle as follows: A muscle-powered vehicle is a vehicle that includes at least one wheel and can be propelled by human power. Examples of muscle-powered vehicles include various types of bicycles, such as a mountain bike, a racing bike, a city bike, a cargo bike, a handbike, or a recumbent bike. The number of wheels on a muscle-powered vehicle is not limited. For example, a muscle-powered vehicle also includes a unicycle or a vehicle with two or more wheels. A muscle-powered vehicle is not limited to a vehicle that can only be propelled by human power. A muscle-powered vehicle also includes an electric bicycle (e-bike), which, in addition to human power, uses the power of an electric motor for propulsion. An e-bike is a bicycle that provides propulsion assistance with an electric motor.In the following description, the muscle-powered vehicle refers to an electric bicycle.

[0049] As in Fig. As shown in Figure 1, a muscle-powered vehicle 10 includes, for example, a crank 12 to which human power is applied. The muscle-powered vehicle 10 includes, for example, a wheel 14 and a vehicle body 16. The wheel 14 includes, for example, a drive wheel 14A and a driven wheel 14B. The drive wheel 14A is, for example, a rear wheel of the muscle-powered vehicle 10. The driven wheel 14B is, for example, a front wheel of the muscle-powered vehicle 10. The drive wheel 14A can be the front wheel of the muscle-powered vehicle 10. In a case where the drive wheel 14A is the front wheel, the driven wheel 14B is the rear wheel.

[0050] The vehicle body 16 includes, for example, a frame 18. The crank 12 includes, for example, a crank axle 12A and two crank arms 12B and 12C. The crank axle 12A is rotatable relative to the frame 18. The two crank arms 12B and 12C are each provided at two axial ends of the crank axle 12A. A pedal 20A is connected to crank arm 12B. A pedal 20C is connected to crank arm 12C. The drive wheel 14A is driven, for example, by the rotation of the crank 12. The drive wheel 14A is supported, for example, by the frame 18.

[0051] The crank 12 is connected, for example, to the drive wheel 14A via a drive mechanism 22. The drive mechanism 22 includes, for example, a first rotating body 24 which is coupled to the crank axle 12A. The crank axle 12A is connected, for example, via a first one-way coupling 38, which is in Fig. The first rotating body 24 is shown in Figure 6. The crank axle 12A can be rotatably coupled to the first rotating body 24 in one piece. The first rotating body 24 includes, for example, a sprocket, a disc, or a bevel gear.

[0052] The drive mechanism 22 further includes, for example, a second rotating body 26 and a connecting element 28. The connecting element 28 transmits the rotational force of the first rotating body 24 to the second rotating body 26. The connecting element 28 includes, for example, a chain, a belt, or a shaft.

[0053] The second rotating body 26 is coupled, for example, to the drive wheel 14A. The second rotating body 26 includes, for example, a sprocket, a disc, or a bevel gear. For example, a second one-way coupling is provided in a power transmission path for the human driving force between the second rotating body 26 and the drive wheel 14A. The second one-way coupling is configured, for example, to rotate the drive wheel 14A forward when the second rotating body 26 is rotated forward. The second one-way coupling is configured, for example, to allow relative rotation of the second rotating body 26 and the drive wheel 14A when the second rotating body 26 is rotated backward.

[0054] The front wheel is attached to the frame 18, for example, via a front fork 30. A handlebar 34 is connected to the front fork 30 via a stem 32. In the present embodiment, the rear wheel is connected to the crank 12 via the drive mechanism 22. In the present embodiment, the rear wheel is the drive wheel 14A and the front wheel is the driven wheel 14B.

[0055] The muscle-powered vehicle 10 further includes, for example, a battery 36. The battery 36 includes, for example, one or more battery cells. Each battery cell includes, for example, a rechargeable battery. The battery 36 is configured, for example, to supply electrical energy to the drive unit 40. The battery 36 is connected, for example, to the drive unit 40 in a manner that enables wired or wireless communication. In a case where the battery 36 is connected to the drive unit 40 in a manner that enables wired communication, the battery 36 is configured, for example, to communicate with the drive unit 40 via a conductive body, such as circuit board wiring, an electrical cable, or the like.In a case where the battery 36 is connected to the drive unit 40 in a manner that enables wired communication, the battery 36 can be configured to communicate with the drive unit 40 via a fiber optic cable. The battery 36 is configured to establish communication with the drive unit 40, for example, via Power Line Communication (PLC), Controller Area Network (CAN), or Universal Asynchronous Receiver-Transmitter (UART).

[0056] As in the Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the drive unit 40 for a muscle-powered vehicle includes, for example, a support 42, a drive shaft 44, an output section 46, a motor 48, a transmission mechanism 50 and a motor output shaft 52.

[0057] As in Fig. As shown in Figure 6, the drive unit 40 includes, for example, a housing 54. The housing 54 forms, for example, a receiving space SA. Within the receiving space SA, the housing 54 at least partially receives, for example, at least one of the drive shaft 44, the output section 46, the motor 48, the transmission mechanism 50, and the motor output shaft 52. The housing 54 contains, for example, a metal material. The metal material includes, for example, at least one of an aluminum alloy and one of a magnesium alloy. Instead of, or in addition to, the metal material, the housing 54 may contain a plastic.

[0058] The support 42 is, for example, formed integrally with at least part of the housing 54. The support 42, for example, 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.

[0059] The drive unit 40 is, for example, detachably attached to the frame 18. The housing 54 includes at least one coupling section 54A. The at least one coupling section 54A is provided on an outer circumferential section of the housing 54. The at least one coupling section 54A includes at least one hole and an internally threaded section. The hole and the internally threaded section extend, for example, in a direction parallel to the drive shaft 44. The housing 54 includes, for example, three coupling sections 54A. For example, the drive unit 40 is attached to a frame 18 by attaching a fastening element, for example, a screw, to at least one of the at least one coupling section 54A and to a section of the frame 18 corresponding to the at least one coupling section 54A.

[0060] The support 42 includes, for example, a first support 42X and a second support 42Y. The first support 42X includes, for example, a wall of the housing 54 located on one side with respect to an axial direction X of the drive shaft 44. The second support 42Y includes, for example, a wall of the housing 54 located on the other side with respect to the axial direction X of the drive shaft 44. The second support 42Y is connected to the first support 42X, for example, by a fastener, such as a screw. For example, the first support 42X and the second support 42Y are connected to each other to form the receiving space SA between the first support 42X and the second support 42Y. The support 42 includes, for example, a third support 42Z. The third support 42Z is ​​arranged, for example, in the receiving space SA.The third support 42Z, for example, supports at least part of the motor output shaft 52 and at least part of the transmission mechanism 50.

[0061] In one example, the drive shaft 44 receives the human driving force and includes a first axis C1. The drive shaft 44 is, for example, the crankshaft 12A. As long as the drive shaft 44 is a shaft that receives the human driving force, the drive shaft 44 can be different from the crankshaft 12A. In a case where the drive shaft 44 is different from the crankshaft 12A, the drive shaft 44 can be a shaft separate from and connected to the crankshaft 12A. The drive shaft 44 is, for example, made of metal. The drive shaft 44 is, for example, a hollow shaft. The drive shaft 44 can be a solid shaft. The drive shaft 44 is, for example, supported by the support 42 in a rotatable manner relative to the support 42. For example, a bearing is provided between the drive shaft 44 and the support 42 in the radial direction of the drive shaft 44, which rotatably supports the drive shaft 44.

[0062] As in the Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the support 42 contains a first hole 42A and a second hole 42B. The first hole 42A is provided, for example, in the first support 42X. The second hole 42B is provided, for example, in the second support 42Y. The drive shaft 44 contains, for example, a first drive shaft end 44A and a second drive shaft end 44B, which is opposite the first drive shaft end 44A in the axial direction X of the drive shaft 44. The drive shaft 44 extends, for example, 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 outwards from the support 42. The first drive shaft end 44A is exposed outwards from the support 42 through the first hole 42A. The second drive shaft end 44B is exposed outwards from the support 42 through the second hole 42B.

[0063] The output section 46 is provided, for example, on the drive shaft 44. The output section 46 is, for example, a hollow shaft. At least a portion of the drive shaft 44 is, for example, inserted into the output section 46. The output section 46 contains, for example, a metal material. The output section 46 includes a first output section end 46A and a second output section end 46B, which is opposite the first output section end 46A in the axial direction X of the drive shaft 44. The output section 46 includes, for example, a connecting section 46C. The connecting section 46C is provided, for example, at the second output section end 46B of the output section 46. The connecting section 46C is provided, for example, on an outer circumferential surface of the second output section end 46B of the output section 46. The connecting section 46C includes, for example, keyways.For example, the first rotating body 24 is attached to the connecting section 46C.

[0064] At least part of the output section 46 is located, for example, in the second hole 42B. The output section 46 is held, for example, by the second support 42Y in a rotatable manner relative to the second support 42Y. For example, a bearing that rotatably supports the output section 46 relative to the second support 42Y is provided between the output section 46 and the second support 42Y in the radial direction of the output section 46. The output section 46 extends around the drive shaft 44. The output section 46 is coupled to the drive shaft 44, for example, via the first one-way coupling 38. The first one-way coupling 38 is configured, for example, to rotate the output section 46 in a case where the drive shaft 44 is rotated in a first direction of rotation B1.The first one-way coupling 38 is, for example, designed to allow a relative rotation of the drive shaft 44 and the output section 46 in a case where the drive shaft 44 is rotated in a second direction of rotation B2 which is opposite to the first direction of rotation B1.

[0065] The motor 48 is configured, for example, to supply a propulsive force to the muscle-powered vehicle 10. The motor 48 is configured to transmit a rotational force via the motor output shaft 52 to at least one of the driven wheels 14B and a power transmission path for the human propulsion force extending from the pedals 20A and 20B to the drive wheel 14A. The power transmission path for the human propulsion force extending from the pedals 20A and 20B to the drive wheel 14A includes the drive wheel 14A. The motor 48 is, for example, provided on the frame 18 of the muscle-powered vehicle 10. The motor 48 is configured, for example, to transmit a rotational force via the motor output shaft 52 to the output section 46.

[0066] Motor 48 includes, for example, an electric motor. Motor 48 is, for example, a radial-gap motor. Motor 48 is, for example, an internal-rotor motor. Motor 48 is, for example, a brushless motor. Motor 48 can be an axial-gap motor.

[0067] The motor 48, for example, comprises a rotor 56 and a stator 58. The stator 58 is, for example, arranged on a radially outer side of the rotor 56. The stator 58 is, for example, attached to the housing 54. The stator 58 is, for example, ring-shaped. A portion of the housing 54 that accommodates the stator 58 is, for example, formed integrally with the rest of the housing 54. The portion of the housing 54 that accommodates the stator 58 can be formed separately from the rest of the housing 54.

[0068] The rotor 56 is, for example, configured to rotate relative to the stator 58. The rotor 56 contains, for example, a magnet. The rotor 56 is, for example, hollow. The rotor 56 contains, for example, a through-hole 56A through which the motor output shaft 52 extends. The rotor 56 contains, for example, an outer circumferential section 56B, an inner circumferential section 56C, and an intermediate section 56D.

[0069] The outer circumferential section 56B is, for example, ring-shaped when viewed in a direction parallel to the axis of rotation of the rotor 56. The outer circumferential section 56B includes an outer circumferential surface that faces, for example, the stator 58. The magnet is, for example, attached to the outer circumferential section 56B. The magnet can be magnetized on the outer circumferential section 56B. The inner circumferential section 56C is, for example, ring-shaped when viewed in a direction parallel to the axis of rotation of the rotor 56. The through-hole 56A is, for example, provided in the inner circumferential section 56C. The intermediate section 56D connects the outer circumferential section 56B and the inner circumferential section 56C. The intermediate section 56D extends, for example, in a radial direction of the rotor 56. The intermediate section 56D is, for example, rod-shaped or plate-shaped when viewed in a direction parallel to the axis of rotation of the rotor 56. The rotor 56 contains, for example, several intermediate sections 56D.In the present embodiment, the rotor 56 comprises five intermediate sections 56D. The intermediate sections 56D are, for example, provided at equal intervals in the circumferential direction of the rotor 56. The rotor 56 can contain only one intermediate section 56D.

[0070] The dimension of the intermediate section 56D in a direction parallel to the axis of rotation of the rotor 56 is, for example, less than or equal to the dimension of the outer circumferential section 56B in a direction parallel to the axis of rotation of the rotor 56. The dimension of the inner circumferential section 56C in a direction parallel to the axis of rotation of the rotor 56 is, for example, less than the dimension of the outer circumferential section 56B in a direction parallel to the axis of rotation of the rotor 56. The intermediate section 56D is located, for example, between two ends of the outer circumferential section 56B in a direction parallel to the axis of rotation of the rotor 56. The intermediate section 56D is located, for example, between two ends of the inner circumferential section 56C in a direction parallel to the axis of rotation of the rotor 56.

[0071] For example, in Fig. As shown in Figure 2, the motor 48 has a first maximum outer diameter RA. The first maximum outer diameter RA, for example, essentially coincides with the maximum outer diameter of the rotor 56. The output section 46, for example, has a second maximum outer diameter RB. The second maximum outer diameter RB essentially coincides with the maximum diameter of a fourth gear 84B. The first maximum outer diameter RA is, for example, larger than the second maximum outer diameter RB.

[0072] For example, in the Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the motor output shaft 52 is connected to the rotor 56 and has a second axis C2 that differs from the first axis C1. For example, the axis of rotation of the rotor 56 coincides with the second axis C2. The torque of the rotor 56 is transmitted, for example, via the motor output shaft 52 to the outside of the motor 48. In this description, the motor 48 does not include the motor output shaft 52. In this description, the motor output shaft 52 is not part of the motor 48. For example, the motor output shaft 52 is coupled to the rotor 56 in a manner that allows it to rotate integrally with the rotor 56.

[0073] In the present embodiment, a direction orthogonal to the second axis C2 is designated as the first direction A1. In the present embodiment, a direction parallel to the second axis C2 is designated as the second direction A2. For example, the motor output shaft 52 extends in the second direction A2. The motor output shaft 52 includes, for example, a first motor output shaft end 52A and a second motor output shaft end 52B, which is opposite the first motor output shaft end 52A in the second direction A2. The first motor output shaft end 52A extends, for example, through the through-hole 56A. The second motor output shaft end 52B is, for example, a free end.

[0074] The drive unit 40 further includes, for example, a first bearing 60 that rotatably supports the motor output shaft 52. For example, the first bearing 60 rotatably supports the first motor output shaft end 52A. The first bearing 60 includes, for example, a radial bearing. The first bearing 60 includes, for example, an inner ring, an outer ring, and rolling elements arranged between the inner ring and the outer ring.

[0075] The first bearing 60 is, for example, provided at the first support 42X. At least part of the first bearing 60 overlaps, viewed in the first direction A1, for example, the rotor 56. At least part of the first bearing 60 is located, for example, in the hollow section of the rotor 56. At least part of the first bearing 60 is located between an inner circumferential surface of the stator 58 and the motor output shaft 52. At least part of the first bearing 60 is located between an inner circumferential surface of the annular rotor 56 and the motor output shaft 52.

[0076] The drive unit 40 further includes, for example, a second bearing 62 that rotatably supports the motor output shaft 52. The second bearing 62 rotatably supports, for example, an intermediate section of the motor output shaft 52 between the first motor output shaft end 52A and the second motor output shaft end 52B. The second bearing 62 includes, for example, a radial bearing. The second bearing 62 includes, for example, an inner ring, an outer ring, and rolling elements arranged between the inner and outer rings. The inner ring of the second bearing 62 has a smaller inner diameter than the inner ring of the first bearing 60. The outer ring of the second bearing 62 has a smaller outer diameter than the outer ring of the first bearing 60.

[0077] At least part of the second bearing 62 overlaps, viewed in the first direction A1, for example, the stator 58. At least part of the second bearing 62 is located, for example, in the hollow section of the rotor 56. At least part of the second bearing 62 is located between the inner circumferential surface of the annular stator 58 and the motor output shaft 52. The second bearing 62 is provided, for example, between a support 76 and the motor output shaft 52 in the first direction A1. The second bearing 62 is provided, for example, between a sun gear 70 and the support 76 in the second direction A2.

[0078] The transmission mechanism 50 is, for example, configured to transmit the motor torque of the motor 48 to the output section 46. The transmission mechanism 50 is, for example, provided in a transmission path for the motor torque that extends from the motor 48 to the output section 46. The transmission mechanism 50 is, for example, configured to reduce the rotational speed of the motor 48 and transmit the motor torque to the output section 46. The transmission mechanism 50 is, for example, configured to reduce the rotational speed of the motor 48 in two or more stages and transmit the motor torque to the output section 46. In the present embodiment, the transmission mechanism 50 is configured to reduce the rotational speed of the motor 48 in three stages and transmit the motor torque to the output section 46.

[0079] As in the Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the transmission mechanism 50 includes, for example, a first transmission unit 64. The first transmission unit 64 includes, for example, a speed reduction mechanism 66. The speed reduction mechanism 66 is configured, for example, to reduce the rotational speed of the motor 48 for output. For example, at least part of the speed reduction mechanism 66 is configured to rotate about the second axis C2 and overlaps, viewed in the first direction A1, which is orthogonal to the second axis C2, the motor 48.

[0080] The first transmission unit 64, for example, contains a planetary gear mechanism 68. The planetary gear mechanism 68 is configured, for example, as a speed reducer. The speed reduction mechanism 66, for example, includes the planetary gear mechanism 68. The planetary gear mechanism 68 is configured, for example, such that the rotational speed of an output rotating body of the planetary gear mechanism 68 connected to the output section 46 is lower than the rotational speed of an input rotating body of the planetary gear mechanism 68 connected to the rotor 56. At least part of the planetary gear mechanism 68 is supported, for example, by the support 42.

[0081] For example, in the Fig. 2, Fig. 4 and Fig. As shown in Figure 7, at least a part of the planetary gear mechanism 68 is arranged on a radially inner side of the rotor 56. For example, at least a part of the planetary gear mechanism 68 is arranged on a radially inner side of the outer circumferential section 56B of the rotor 56. The planetary gear mechanism 68 includes, for example, a section that is adjacent to the inner circumferential section 56C of the rotor 56 and a section that is not adjacent to the inner circumferential section 56C of the rotor 56 in the second direction A2. For example, at least a part of the planetary gear mechanism 68 is arranged adjacent to the intermediate section 56D of the rotor 56 in the second direction A2. At least a part of the planetary gear mechanism 68 is arranged on a radially outer side of the inner circumferential section 56C of the rotor 56.The dimension of the planetary gear mechanism 68, which is arranged on the radially inner side of the outer circumferential section 56B of the rotor 56, is, for example, larger than the dimension of the planetary gear mechanism 68, which is arranged on the radially outer side of the inner circumferential section 56C of the rotor 56 in the second direction A2.

[0082] For example, in the Fig. 6, Fig. 7 to Fig. As shown in Figure 8, at least part of the planetary gear mechanism 68 is configured to rotate about the second axis C2 and overlap the motor 48 in the first direction A1, which is orthogonal to the second axis C2. At least part of the planetary gear mechanism 68 overlaps, in the first direction A1, for example, the stator 58. At least part of the planetary gear mechanism 68 is, for example, located on a radially inner side of the stator 58.

[0083] At least part of the planetary gear mechanism 68 overlaps, viewed in the first direction A1, for example, the rotor 56. At least part of the planetary gear mechanism 68 overlaps, viewed in the first direction A1, for example, the outer circumferential section 56B of the rotor 56. At least part of the planetary gear mechanism 68 overlaps, viewed in the first direction A1, for example, the inner circumferential section 56C of the rotor 56. The planetary gear mechanism 68 includes, viewed in the first direction A1, for example, a section that overlaps the intermediate section 56D of the rotor 56, and a section that does not overlap the intermediate section 56D of the rotor 56.

[0084] In the present embodiment, viewed in the first direction A1, part of the planetary gear mechanism 68 overlaps the motor 48. The planetary gear mechanism 68 can, viewed in the first direction A1, completely overlap the motor 48. In a case where the planetary gear mechanism 68 completely overlaps the motor 48, viewed in the first direction A1, the planetary gear mechanism 68 and the rotor 56 are, for example, arranged such that, viewed in the first direction A1, the planetary gear mechanism 68 is completely located on the radially inner side of the outer circumferential section 56B of the rotor 56.

[0085] The planetary gear mechanism 68 includes, for example, the sun gear 70, a ring gear 72, a planet gear 74, and the carrier 76. The planet gear 74 is positioned between the sun gear 70 and the ring gear 72. The carrier 76 supports the planet gear 74.

[0086] The sun gear 70 is, for example, provided on the motor output shaft 52. The sun gear 70 receives, for example, a torque from the motor output shaft 52. The sun gear 70 can be cast integrally with the motor output shaft 52. Alternatively, the sun gear 70 can be cast separately from the motor output shaft 52 and coupled to the motor output shaft 52 to rotate integrally with it. In the present embodiment, the sun gear 70 is formed separately from the motor output shaft 52. The sun gear 70 is, for example, coupled to the motor output shaft 52 to engage a step provided on the motor output shaft 52. The sun gear 70 is, for example, arranged between the rotor 56 and the second bearing 62 in the second direction A2. The sun gear 70 is, for example, arranged adjacent to the inner circumferential section 56C of the rotor 56 in the second direction A2. The sun gear 70 meshes, for example, with the planet gear 74.The axis of the sun gear 70 essentially coincides with the second axis C2 of the motor output shaft 52.

[0087] The ring gear 72 meshes, for example, with the planet gear 74. The ring gear 72 is provided, for example, on the support 42 in a manner that is not rotatable relative to the support 42. The ring gear 72 is supported, for example, by the third support 42Z. The ring gear 72 is supported, for example, on the third support 42Z. The ring gear 72 includes, for example, a radially outwardly projecting flange 72A. The ring gear 72 includes, for example, a ring gear mounting section 72B for attachment to the third support 42Z. The ring gear mounting section 72B is provided, for example, on the flange 72A. The ring gear 72 is fastened, for example, to the third support 42Z by a bolt or the like. The ring gear 72 can be formed integrally with the support 42.

[0088] In one example, the planet gear 74 receives a torque from the sun gear 70 and is located between the sun gear 70 and the ring gear 72. The planet gear 74 is, for example, one of several planet gears 74. The planet gears 74 are, for example, arranged at intervals around the second axis C2 of the motor output shaft 52. The number of planet gears 74 is, for example, two or more and eight or fewer. The number of planet gears 74 is, for example, four.

[0089] In one example, the carrier 76 supports the planet gear 74 and transmits a torque to the output section 46. The carrier 76, for example, includes a carrier pin support 76A, a carrier shaft 76B, and a carrier pin 76C. The carrier pin support 76A is cast integrally with the carrier shaft 76B. The axis of rotation of the carrier 76 essentially coincides with the second axis C2 of the motor output shaft 52. The carrier shaft 76B, for example, is arranged around the motor output shaft 52.

[0090] The support pin 76C rotatably supports the planet gear 74, for example, with a bearing. The support pin 76C is, for example, one of several support pins 76C. The support pins 76C are provided, for example, on the support pin support 76A so that the support pins 76C are arranged at intervals around the second axis C2 of the motor output shaft 52. The number of support pins 76C corresponds to the number of planet gears 74.

[0091] In one example, at least one of the sun gear 70, the planet gear 74, and the ring gear 72, viewed in the first direction A1, overlaps at least partially with the motor 48. At least part of the sun gear 70 overlaps, viewed in the first direction A1, for example, the motor 48. At least part of the planet gear 74 overlaps, viewed in the first direction A1, for example, the motor 48. At least part of the carrier 76 overlaps, viewed in the first direction A1, for example, the motor 48. At least part of the ring gear 72 overlaps, viewed in the first direction A1, for example, the motor 48. In a case where at least one of the carrier 76, the sun gear 70, the planet gear 74, and the ring gear 72, viewed in the first direction A1, at least partially overlaps the motor 48, the remaining carrier 76, the sun gear 70, the planet gear 74, and the ring gear must 72, viewed in the first direction A1, does not overlap engine 48.

[0092] At least one of the carrier 76, the sun gear 70, the planet gear 74 and the ring gear 72 overlaps, viewed in the first direction A1, at least partially, for example, the stator 58. At least one of the carrier 76, the sun gear 70, the planet gear 74 and the ring gear 72 overlaps, viewed in the first direction A1, at least partially, for example, the rotor 56.

[0093] For example, in the Fig. 6, Fig. 7 to Fig. As shown in Figure 8, at least a portion of the sun gear 70, viewed in the first direction A1, overlaps the stator 58. In the present embodiment, the sun gear 70, viewed in the first direction A1, completely overlaps the stator 58. The sun gear 70 can, viewed in the first direction A1, partially overlap the stator 58. For example, at least a portion of the sun gear 70 is arranged on the radially inner side of the stator 58.

[0094] At least part of the sun gear 70 overlaps, as viewed in the first direction A1, for example, the rotor 56. At least part of the sun gear 70 overlaps, as viewed in the first direction A1, for example, the outer circumferential section 56B of the rotor 56. In the present embodiment, only part of the sun gear 70 overlaps, as viewed in the first direction A1, the outer circumferential section 56B of the rotor 56. The sun gear 70 can, as viewed in the first direction A1, completely overlap the outer circumferential section 56B of the rotor 56. The sun gear 70 does not, as viewed in the first direction A1, for example, overlap the inner circumferential section 56C of the rotor 56. At least part of the sun gear 70 can, as viewed in the first direction A1, for example, overlap the inner circumferential section 56C of the rotor 56.

[0095] At least a portion of the ring gear 72 overlaps, viewed in the first direction A1, for example, the stator 58. In the present embodiment, the ring gear 72 completely overlaps the stator 58 when viewed in the first direction A1. The ring gear 72 can also partially overlap the stator 58 when viewed in the first direction A1. For example, at least a portion of the ring gear 72 is arranged on the radially inner side of the stator 58.

[0096] At least a portion of the ring gear 72 overlaps, as viewed in the first direction A1, for example, the rotor 56. At least a portion of the ring gear 72 overlaps, as viewed in the first direction A1, for example, the outer circumferential section 56B of the rotor 56. In the present embodiment, only a portion of the ring gear 72 overlaps, as viewed in the first direction A1, the outer circumferential section 56B of the rotor 56. The ring gear 72 can, as viewed in the first direction A1, completely overlap the outer circumferential section 56B of the rotor 56. At least a portion of the flange 72A is provided, for example, at a position adjacent to the outer circumferential section 56B of the rotor 56 in the second direction A2. The ring gear 72, viewed in the first direction A1, does not overlap, for example, the inner circumferential section 56C of the rotor 56. At least part of the ring gear 72 can, viewed in the first direction A1, overlap, for example, the inner circumferential section 56C of the rotor 56.

[0097] At least a portion of the planet gear 74 overlaps, viewed in the first direction A1, for example, the stator 58. In the present embodiment, the planet gear 74 completely overlaps the stator 58 when viewed in the first direction A1. The planet gear 74 can also partially overlap the stator 58 when viewed in the first direction A1. For example, at least a portion of the planet gear 74 is arranged on the radially inner side of the stator 58.

[0098] At least a portion of the planet gear 74 overlaps, viewed in the first direction A1, for example, the rotor 56. At least a portion of the planet gear 74 overlaps, viewed in the first direction A1, for example, the outer circumferential section 56B of the rotor 56. In the present embodiment, only a portion of the planet gear 74 overlaps, viewed in the first direction A1, the outer circumferential section 56B of the rotor 56. The planet gear 74 can, viewed in the first direction A1, completely overlap the outer circumferential section 56B of the rotor 56. The planet gear 74 does not, viewed in the first direction A1, for example, overlap the inner circumferential section 56C of the rotor 56. At least a portion of the planet gear 74 can, viewed in the first direction A1, for example, overlap the inner circumferential section 56C of the rotor 56.

[0099] At least a portion of the support 76 overlaps, as viewed in the first direction A1, for example, the stator 58. In the present embodiment, only a portion of the support 76 overlaps the stator 58 as viewed in the first direction A1. The support 76 can completely overlap the stator 58 as viewed in the first direction A1. At least a portion of the support 76 is, for example, arranged on the radially inner side of the stator 58.

[0100] At least part of the support 76 overlaps, viewed in the first direction A1, for example, the rotor 56. At least part of the support 76 overlaps, viewed in the first direction A1, for example, the outer circumferential section 56B of the rotor 56. In the present embodiment, viewed in the first direction A1, only part of the support 76 overlaps the outer circumferential section 56B of the rotor 56. The support 76 can, viewed in the first direction A1, completely overlap the outer circumferential section 56B of the rotor 56. At least part of the support 76 overlaps, viewed in the first direction A1, for example, the inner circumferential section 56C of the rotor 56. In the present embodiment, only part of the support pin 76C of the support 76 overlaps the inner circumferential section 56C of the rotor 56, viewed in the first direction A1. The support 76 does not necessarily have to overlap the inner circumferential section 56C of the rotor 56, viewed in the first direction A1.

[0101] As in the Fig. 2 and Fig. As shown in Figure 7, the planetary gear mechanism 68, for example, has a maximum outer diameter RX. The maximum outer diameter RX is essentially the same as, for example, the maximum outer diameter of the ring gear 72. The motor 48, for example, has a minimum inner diameter RY. The minimum inner diameter RY is essentially the same as, for example, the diameter of the inner circumferential surface of the rotor 56. The maximum outer diameter RX of the planetary gear mechanism 68 is, for example, smaller than the minimum inner diameter RY of the motor 48. For example, the root diameter of the ring gear 72 is smaller than the diameter of the inner circumferential surface of the outer circumferential section 56B of the rotor 56. The maximum outer diameter of the ring gear 72 is, for example, larger than the diameter of the inner circumferential surface of the outer circumferential section 56B of the rotor 56.The maximum outer diameter of the ring gear 72 can, for example, be less than or equal to the diameter of the inner circumferential surface of the outer circumferential section 56B of the rotor 56. For example, the outer diameter of a part of the ring gear 72 on which a tooth is provided is smaller than the diameter of the inner circumferential surface of the outer circumferential section 56B of the rotor 56.

[0102] For example, in the Fig. As shown in Figures 2 and 6 to 8, the transmission mechanism 50 further includes a transmission shaft 78 with a third axis C3 that differs from the first axis C1 and the second axis C2. The second axis C2 and the third axis C3 are parallel to the first axis C1. The drive shaft 44, the motor output shaft 52, and the transmission shaft 78 are arranged, for example, in the same plane. Viewed in the second direction A2, the first axis C1, the second axis C2, and the third axis C3 are arranged along a single straight line. The transmission shaft 78 is, for example, located next to 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.

[0103] The transmission shaft 78 is, for example, a hollow shaft. The transmission shaft 78 can also be a solid shaft. The transmission shaft 78 is supported, for example, by the second support 42Y and the third support 42Z. The transmission shaft 78 includes, for example, a first transmission shaft end 78A and a second transmission shaft end 78B, which is opposite the first transmission shaft end 78A in the second direction A2. The first transmission shaft end 78A is supported, for example, by the third support 42Z. For example, a bearing is provided between the first transmission shaft end 78A and the third support 42Z in the first direction A1. The second transmission shaft end 78B is supported, for example, by the second support 42Y. For example, a bearing is provided between the second transmission shaft end 78B and the second support 42Y.

[0104] The transmission shaft 78, for example, comprises a first part 78X and a second part 78Y. The first part 78X, for example, includes the first transmission shaft end 78A. The second part 78Y, for example, includes the second transmission shaft end 78B. The first part 78X is, for example, formed integrally with the second part 78Y. For example, the maximum outer diameter of the first part 78X is larger than the maximum outer diameter of the second part 78Y.

[0105] The transmission mechanism 50 further includes, for example, a second transmission unit 80. The second transmission unit 80 includes, for example, a first gear 80A and a second gear 80B. The first gear 80A receives a torque from the planetary gear mechanism 68. The second gear 80B meshes with the first gear 80A and is located on the transmission shaft 78. The first gear 80A is arranged, for example, around the carrier shaft 76B. The axis of the first gear 80A essentially coincides with the second axis C2 of the motor output shaft 52.

[0106] The second gear 80B, for example, is arranged around the transmission shaft 78. The axis of the second gear 80B essentially coincides with the third axis C3 of the transmission shaft 78.

[0107] The first gear 80A, for example, has a first pitch circle diameter R1. The second gear 80B, for example, has a second pitch circle diameter R2. The second pitch circle diameter R2 is, for example, 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 gear 80B is lower than the rotational speed of the first gear 80A. Each of the first gear 80A and the second gear 80B contains, for example, a helical gear. Each of the first gear 80A and the second gear 80B can also include a spur gear.

[0108] The drive unit 40 further includes, for example, a third one-way clutch 82. The third one-way clutch 82 is provided, for example, in a power transmission path between the motor 48 and the drive shaft 44. The third one-way clutch 82 is provided, for example, between the second gear 80B and the transmission shaft 78 in the second direction A2. The second gear 80B is connected, for example, to the transmission shaft 78 via the third one-way clutch 82. The third one-way clutch 82 can be provided between the rotor 56 and the motor output shaft 52. The third one-way clutch 82 can be provided at any position of the transmission mechanism 50. The drive unit 40 need not include the third one-way clutch 82. In a case where the drive unit 40 does not include, for example, the third one-way clutch 82, the motor 48 is configured to be regenerative.

[0109] The third one-way clutch 82 is, for example, configured to allow relative rotation of the drive shaft 44 and the second gear 80B in a case where the drive shaft 44 is rotated in the first direction of rotation B1 and the motor output shaft 52 is not rotating. The third one-way clutch 82 includes, for example, at least one roller clutch, one freewheel clutch, and one ratchet clutch.

[0110] The transmission mechanism 50 further includes, for example, a third transmission unit 84. The third transmission unit 84 includes, for example, a third gear 84A and a fourth gear 84B. The third gear 84A is, for example, provided on the transmission shaft 78. For example, the distance from the third gear 84A to the second support 42Y in the second direction A2 is smaller than the distance from the second gear 84B to the second support 42Y. The third gear 84A can be connected to the transmission shaft 78 via a one-way coupling. Alternatively, the third gear 84A can be connected to the transmission shaft 78 to rotate integrally with it. The fourth gear 84B, for example, meshes with the third gear 84A and is provided at the output section 46.The fourth gear 84B is formed, for example, on an outer circumferential surface of the output section 46 at the first output section end 46A of the output section 46. The fourth gear 84B can be formed separately from the output section 46 and coupled to the output section 46 in order to rotate integrally with the output section 46.

[0111] The third gear 84A, for example, has a third pitch circle diameter R3. The fourth gear 84B, for example, has a fourth pitch circle diameter R4. The fourth pitch circle diameter R4 is, for example, 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 gear 84B is lower than the rotational speed of the third gear 84A. The third gear 84A and the fourth gear 84B, for example, form helical gears. The third gear 84A and the fourth gear 84B can form spur gears.

[0112] For example, in the Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the drive unit 40 further includes a printed circuit board 86. The electrical energy from the battery 36 is supplied to the printed circuit board 86, for example. The drive unit 40 may contain a printed circuit board that differs from the printed circuit board 86. The printed circuit board 86 is, for example, arranged in the receiving space SA. The printed circuit board 86 is arranged, for example, such that a mounting surface of the printed circuit board 86 is substantially parallel to the first direction A1. The printed circuit board 86 is located, for example, at a position separated from the motor output shaft 52 in the second direction A2, which is parallel to the second axis C2. The printed circuit board 86 is arranged, for example, to face the second motor output shaft end 52B of the motor output shaft 52. The stator 58 contains, for example, coils. The stator 58 contains, for example, terminals that are electrically connected to the coils.The terminals extend, for example, in the second direction A2 and are electrically connected to the circuit board 86.

[0113] For example, circuit board 86 is configured to overlap motor 48 when viewed in the second direction A2. Circuit board 86 is configured to overlap planetary gear mechanism 68 when viewed in the second direction A2. Circuit board 86 is configured, for example, not to overlap drive shaft 44 when viewed in the second direction A2. Circuit board 86 is configured, for example, not to overlap at least part of transmission mechanism 50 when viewed in the second direction A2. Circuit board 86 is configured, for example, not to overlap third gear 84A when viewed in the second direction A2. Circuit board 86 is configured, for example, not to overlap fourth gear 84B when viewed in the second direction A2.

[0114] The drive unit 40 also includes, for example, a control unit. The control unit is, for example, located on the circuit board 86. The control unit includes, for example, a processor that executes predefined control programs. The processor includes, for example, a central processing unit (CPU) or a microprocessor unit (MPU). The processor can be located in separate locations. The control unit can contain one or more microcomputers.

[0115] The drive unit 40 also includes, for example, a memory. The memory is provided, for example, on the circuit board 86. The memory stores, for example, various control programs and information used for different control processes. The memory includes, for example, non-volatile memory and volatile memory. The non-volatile memory includes, for example, at least one read-only memory (ROM), one erasable programmable read-only memory (EPROM), one electrically erasable programmable read-only memory (EEPROM), and one flash memory. The volatile memory includes, for example, random-access memory (RAM).

[0116] The drive unit 40 further includes, for example, a drive circuit for the motor 48. The drive circuit is provided, for example, on the printed circuit board 86. The drive circuit includes, for example, an inverter circuit. The drive control circuit controls, for example, the electrical energy supplied to the motor 48 by the battery 36. The drive circuit is connected, for example, to the controller to enable wired or wireless communication. In a case where the drive circuit is connected, for example, to the controller in a manner enabling wired communication, the drive circuit is configured to communicate with the controller via a conductive body, such as printed circuit board wiring, an electrical cable, or the like.In a case where the drive circuit is connected to the controller in a manner enabling wired communication, the drive circuit can be configured to communicate with the controller via a fiber optic cable. For example, the drive circuit drives motor 48 in response to a control signal from the controller.

[0117] The drive unit 40 further includes, for example, a motor rotation state detector 88, which detects a rotation state of the motor output shaft 52. For example, the motor rotation state detector 88 outputs a signal corresponding to the rotation of the motor output shaft 52. The motor rotation state detector 88 includes, for example, a magnetic sensor. The motor rotation state detector 88 is configured, for example, to detect a magnet provided on the motor output shaft 52. The magnet is provided, for example, at the second motor output shaft end 52B of the motor output shaft 52. The circuit board 86 includes, for example, a predetermined part 86A, which faces the motor output shaft 52 in the second direction A2. The motor rotation state detector 88 is provided, for example, on the predetermined part 86A.The motor rotation state detector 88 is connected to the controller, for example, via a conductive line, an electrical cable, a radio communication device, or the like. The motor rotation state detector 88 and the controller are, for example, mounted on the same circuit board 86.

[0118] The drive unit 40 further includes, for example, a human propulsion detector 90, which detects the human propulsion force supplied to the muscle-powered vehicle 10. The human propulsion detector 90 includes, for example, a strain sensor. The strain sensor includes a strain gauge. The human propulsion detector 90 may include a magnetostrictive sensor. The human propulsion detector 90 is provided, for example, on or near the outer circumferential surface of the drive shaft 44. The human propulsion detector 90 is provided, for example, on a printed circuit board that is different from the printed circuit board 86 on which the control unit is provided.The human force detector 90 is connected to the control unit, for example, via a conductive wire, an electrical cable, a radio communication device, or the like. The human force detector 90 can be located on one or both crank arms 12B and 12C. In a case where the human force detector 90 is located on one or both crank arms 12B and 12C, the human force detector 90 includes, for example, a strain gauge.

[0119] The control system is configured, for example, to calculate the rotational speed of motor 48 based on a signal from the motor rotation state detector 88. The control system is configured, for example, to control motor 48 based on a signal from the motor rotation state detector 88. The control system is configured, for example, to control motor 48 based on a signal from the human propulsion force detector 90. The control system is configured, for example, to change the assist force generated by motor 48 based on a signal from the human propulsion force detector 90.

[0120] The one in the Fig. 6, Fig. 7 to Fig. The transmission mechanism 50 shown in Figure 8 reduces the rotational speed of the motor 48 with the first transmission unit 64, the second transmission unit 80, and the third transmission unit 84 and transmits the motor torque to the output section 46. The transmission mechanism 50 reduces the rotational speed of the motor 48 with the plurality of transmission units and transmits the motor torque to the output section 46. Accordingly, the transmission mechanism 50 preferably exerts a driving force on the muscle-powered vehicle 10. The planetary gear mechanism 68 and the drive shaft 44 are arranged about different axes. Therefore, compared to a case in which the planetary gear mechanism 68 is located on the drive shaft 44, the drive unit 40 brings the crank axis 12A closer to the wheel axis of the rear wheel. The planetary gear mechanism 68 overlaps the motor 48 when viewed in the first direction A1.This reduces the size of the drive unit 40 in the second direction A2. Modified examples

[0121] The description of the above embodiment illustrates, without limitation, an applicable form of a drive unit for a human-powered vehicle according to the present disclosure. The drive unit for a human-powered vehicle according to the present disclosure is applicable, for example, to modified examples of the above embodiment described below, as well as to combinations of at least two of the modified examples that do not contradict each other. In the modified examples described below, those components are designated with the same reference numerals that are identical to the corresponding components of the above-mentioned embodiment. These components are not described in detail.

[0122] As in Fig. As shown in 9, motor 48 can be an outrunner motor. The one in Fig. The rotor 56 shown in Figure 9 is, for example, arranged on a radially outer side of the stator 58. At least part of the planetary gear mechanism 68 is, for example, arranged on a radially inner side of the stator 58. At least part of the planetary gear mechanism 68 overlaps, viewed in the first direction A1, the stator 58.

[0123] As in Fig. As shown in Figure 10, at least part of the planetary gear mechanism 68, viewed in the first direction A1, can overlap the rotor 56 on a radially outer side of the motor 48. In this modified example, the motor 48 can be of the inside rotor motor type or the outside rotor motor type.

[0124] The transmission mechanism 50 can include a speed amplifier. In this modified example, for instance, at least one of the second transmission unit 80 and the third transmission unit 84 are configured as speed amplifiers. The transmission mechanism 50 can, for example, include a further speed amplifier in addition to the at least one of the second transmission unit 80 and the third transmission unit 84. In this modified example, the transmission mechanism 50 can, for instance, be configured to combine the speed reduction mechanism 66 and the speed amplifiers to reduce the rotational speed of the motor 48 and transmit the motor torque to the output section 46.

[0125] Instead of the planetary gear mechanism 68, the speed reduction mechanism 66 can include a first outer circumferential gear provided on the outer circumferential section 56B of the rotor 56, and a second outer circumferential gear that meshes with the first outer circumferential gear and has a larger pitch circle diameter than the first outer circumferential gear. The second outer circumferential gear is, for example, provided on the transmission shaft 78. In this modified example, for instance, the first outer circumferential gear is arranged to at least partially overlap the motor 48, viewed in the first direction A1.

[0126] The planetary gear mechanism 68 can be configured to transmit the torque supplied to the sun gear 70 from the ring gear 72. In this modified example, for instance, the ring gear 72 is configured to transmit the torque to the drive shaft 44. In this modified example, for instance, the carrier 76 is configured to be non-rotatable relative to the sun gear 70.

[0127] The planetary gear mechanism 68 can be a speed amplifier. In this modified example, for instance, the transmission mechanism 50 can be configured to combine the planetary gear mechanism 68, configured as a speed amplifier, with the second transmission unit 80 and the third transmission unit 84, configured as speed reducers, to reduce the rotational speed of the motor 48 and transmit the motor torque to the output section 46.

[0128] At least one of the second transmission unit 80 and the third transmission unit 84 can be omitted. In addition to the first transmission unit 64, the second transmission unit 80, and the third transmission unit 84, the transmission mechanism 50 may further include a transmission unit that differs from the first transmission unit 64, the second transmission unit 80, and the third transmission unit 84.

[0129] At least one of the second transmission unit 80 and the third transmission unit 84 may contain a chain and sprockets instead of gears. At least one of the second transmission unit 80 and the third transmission unit 84 may include pulleys and a belt.

[0130] The transmission mechanism 50 can include a further transmission shaft in addition to the transmission shaft 78. In a case where the transmission mechanism 50 includes a further transmission shaft, the transmission mechanism 50 includes, for example, a fourth transmission unit provided on the further transmission shaft, in addition to the planetary gear mechanism 68, the second transmission unit 80 and the third transmission unit 84.

[0131] At least one of the second axis C2 and the third axis C3 cannot be parallel to the first axis C1. In this modified example, for instance, the second axis C2 and the third axis C3 can be orthogonal to the first axis C1. In this modified example, for instance, the motor 48 can be configured such that the second axis C2 and the third axis C3 are orthogonal to the axial direction X of the drive shaft 44 and to the first axis C1.

[0132] At least part of the first bearing 60 can be arranged so as not to overlap the rotor 56 when viewed in the first direction A1.

[0133] The circuit board 86 can be arranged so as not to overlap the motor output shaft 52 when viewed in the second direction A2.

[0134] The circuit board 86 can be arranged to overlap the transmission shaft 78 when viewed in the second direction A2.

[0135] The first maximum outer diameter RA can be less than or equal to the second maximum outer diameter RB.

[0136] The motor rotation state detector 88 can be located in a position different from the predetermined part 86A. In this modified example, for instance, the motor rotation state detector 88 is located on a radially outer side of the motor 48. The position of the motor rotation state detector 88 in the drive unit 40 can be changed, as long as the motor rotation state detector 88 is located on a part that enables the detection of the rotation state of the motor 48.

[0137] The drive unit 40 does not necessarily have to include the human propulsion detector 90. In a case where the drive unit 40 does not include the human propulsion detector 90, a detector that detects human propulsion may be provided on the crank arms 12B and 12C or the pedals 20A and 20B.

[0138] In this description, the phrase “at least one of,” as used in this revelation, means “one or more” of a desired choice. For example, the phrase “at least one of,” as used in this revelation, means “only a single choice” or “both of two choices” when the number of choices is two. As another example, the phrase “at least one of” in this revelation means “only a single choice” or “any combination of two or more choices” when the number of choices is three or more. Furthermore, the term “and / or,” as used in this revelation, means “either one of or both of.” For example, the phrase “at least one of A and B” includes (1) only A, (2) only B, and (3) both A and B.The expression “at least one of A, B, and C” includes (1) only A, (2) only B, (3) only C, (4) both A and B, (5) both B and C, (6) both A and C, and (7) all three, A, B, and C. In other words, the expression “at least one of A and B” in this revelation does not mean “at least one of A and at least one of B”.

[0139] Ordinal numbers such as "first", "second" and "third" are used in this revelation only to distinguish elements with the same name from one another and have no special meaning. DESCRIPTION OF REFERENCE MARKS 10 muscle-powered vehicles, 40 drive unit 42 support 44 Drive shaft 46 Output section 48 engine 50 Transmission mechanism 52 Motor output shaft 56 Rotor 58 Stator 60 first camp 64 first transmission unit 66 Speed ​​reduction mechanism 68 Planetary gear mechanism 70 Sun wheel 72 Ring gear 74 planetary gear 76 carriers 78 transmission wave 80 second transmission unit 80A first gear 80B second gear 84 third transmission unit 84A third gear 84B fourth gear 86 circuit board 86A predetermined part 88 Motor rotation status detector 90 Human Drive Detector QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2024-144215

[0001] JP 2014-196036

[0003]

Claims

[1] Drive unit (40) for a muscle-powered vehicle, the drive unit (40) comprising: a support (42); a drive shaft (44) that receives the human driving force and contains a first axle; an output section (46) provided on the drive shaft (44); a motor (48) with a rotor (56) and a stator (58); a transmission mechanism (50) designed to transmit the torque of the motor (48) to the output section (46); and a motor output shaft (52) connected to the rotor (56) and comprising a second axis that is different from the first axis, wherein the transmission mechanism (50) includes a first transmission unit (64) which includes a planetary gear mechanism (68), and at least part of the planetary gear mechanism (68) is set up to rotate about the second axis and overlaps the motor (48), seen in a first direction which is orthogonal to the second axis. [2] Drive unit (40) according to claim 1, in which at least one part of the planetary gear mechanism (68), viewed in the first direction, overlaps the rotor (56). [3] Drive unit (40) according to claim 2, wherein the stator (58) is arranged on a radially outer side of the rotor (56). and which at least part of the planetary gear mechanism (68) is arranged on a radially inner side of the rotor (56). [4] Drive unit (40) according to claim 2, wherein the rotor (56) is arranged on a radially outer side of the stator (58), and which at least part of the planetary gear mechanism (68) is arranged on a radially inner side of the stator (58). [5] Drive unit (40) according to one of claims 1 to 4, in which at least one part of the planetary gear mechanism (68), viewed in the first direction, overlaps the rotor (56) on a radially outer side of the motor (48). [6] Drive unit (40) according to any one of claims 1 to 5, wherein the transmission mechanism (50) further comprises a transmission shaft (78) with a third axis which differs from the first axis and the second axis. [7] Drive unit (40) according to claim 6, wherein the transmission mechanism (50) further comprises a second transmission unit (80) comprising a first gear (80A) which receives torque from the planetary gear mechanism (68) and a second gear (80B) which engages with the first gear (80A) and is provided on the transmission shaft (78). [8] Drive unit (40) according to claim 7, wherein the first gear (80A) has a first pitch circle diameter, the second gear gear (80B) has a second pitch circle diameter and the second pitch circle diameter is larger than the first pitch circle diameter. [9] Drive unit (40) according to claim 7 or 8, wherein the transmission mechanism (50) further comprises a third transmission unit (84) comprising a third gear (84A) provided on the transmission shaft (78) and a fourth gear (84B) which engages with the third gear (84A) and is provided on the output section (46). [10] Drive unit (40) according to claim 9, wherein the third gear gear (84A) has a third pitch circle diameter, the fourth gear (84B) has a fourth pitch circle diameter and the fourth pitch circle diameter is larger than the third pitch circle diameter. [11] Drive unit (40) according to one of claims 6 to 10, wherein the second axis and the third axis are parallel to the first axis. [12] Drive unit (40) according to one of claims 1 to 11, in which the planetary gear mechanism (68) contains a sun gear (70) that receives a torque from the motor output shaft (52), a hollow wheel (72) which is provided on the support (42) in a non-rotatable manner relative to the support (42), a planetary gear (74) which receives a torque from the sun gear (70) and is provided between the sun gear (70) and the ring gear (72), and a support (76) that supports the planet gear (74) and delivers a torque to the output section (46). [13] Drive unit (40) according to one of claims 1 to 12, in which the planetary gear mechanism (68) completely overlaps the motor (48) in the first direction. [14] Drive unit (40) according to one of claims 1 to 11, wherein the planetary gear mechanism (68) contains a sun wheel (70), a ring gear (72), a planet gear (74) provided between the sun gear (70) and the ring gear (72) and a support (76) that supports the planet gear (74); and at least one of the sun gear (70), the planet gear (74) and the ring gear (72), viewed in the first direction, at least partially overlaps the motor (48). [15] Drive unit (40) according to claim 14, in which at least a part of the ring gear (72), viewed in the first direction, overlaps the motor (48). [16] Drive unit (40) according to any one of claims 1 to 15, further comprising: a first bearing (60) that rotatably supports the motor output shaft (52), where at least part of the first bearing (60), viewed in the first direction, overlaps the rotor (56). [17] Drive unit (40) according to one of claims 1 to 16, wherein the motor (48) has a first maximum outer diameter, the output section (46) has a second maximum outer diameter, and the first maximum diameter is larger than the second maximum diameter. [18] Drive unit (40) according to any one of claims 1 to 17, further comprising: a circuit board (86), the circuit board (86) is arranged in a position that is separated from the motor output shaft (52) in a second direction that runs parallel to the second axis. [19] Drive unit (40) according to claim 18, further comprising: a motor rotation state detector (88) that detects a rotation state of the motor output shaft (52), the circuit board (86) contains a predetermined part (86A) which faces the motor output shaft (52) in the second direction, and wherein the motor rotation state detector (88) is provided on the predetermined part (86A). [20] Drive unit (40) according to one of claims 1 to 19, further comprising a detector (90) for human driving force, which detects the human driving force supplied to the muscle-powered vehicle. [21] Drive unit (40) for a muscle-powered vehicle, the drive unit (40) comprising: a support (42); a drive shaft (44) that receives human driving force and contains a first axle; an output section (46) provided on the drive shaft (44); a motor (48) with a rotor (56) and a stator (58); a transmission mechanism (50) designed to transmit the torque of the motor (48) to the output section (46); and a motor output shaft (52) which is connected to the rotor (56) and has a second axis which is different from the first axis, the transmission mechanism (50) includes a first transmission unit (64) which contains a speed reduction mechanism (66), and wherein at least part of the speed reduction mechanism (66) is set up to rotate about the second axis and overlaps, viewed in the first direction which is orthogonal to the second axis, the motor (48).

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