Drive unit for human-powered vehicle, drive system for human-powered vehicle, and human-powered vehicle

Abstract

To provide a drive unit for human-powered vehicle that can satisfactorily control rotation of a transmission member depending on rotation of a crankshaft, a drive system for human-powered vehicle, and a human-powered vehicle.SOLUTION: A drive unit for human-powered vehicle comprises a crankshaft fitting part, a one-way clutch, an output part, an electric drive source, and a control part for controlling the electric drive source. The one-way clutch is so configured that the crankshaft and the output part integrally rotate when the crankshaft rotates in a first crank rotation direction, and is so configured as to permit relative rotation of the crankshaft and the output part when the crankshaft rotates in a second crank rotation direction. The control part controls the electric drive source so that the transmission member rotates in a first transmission member rotation direction when the crankshaft rotates in the first crank rotation direction, and the transmission member rotates in a second transmission member rotation direction opposite to the first transmission member rotation direction when the crankshaft rotates in the second crank rotation direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a drive unit for a human-powered vehicle, a drive system for a human-powered vehicle, and a human-powered vehicle. [Background technology]

[0002] For example, in a drive unit for a human-powered vehicle disclosed in Patent Document 1, when the crankshaft rotates in a first crank rotation direction, the motor rotates a transmission member to drive the drive wheels, and the crank shaft When the crank rotates in a second direction opposite to the first direction, the motor stops. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5202769 Summary of the Invention [Problem to be solved by the invention]

[0004] One object of the present disclosure is to provide a drive unit for a human-powered vehicle, a drive system for a human-powered vehicle, and a human-powered vehicle that can suitably control the rotation of a transmission member in accordance with the rotation of a crankshaft. [Means for solving the problem]

[0005] A drive unit according to a first aspect of the present disclosure is a drive unit for a human-powered vehicle, and includes: a crankshaft mounting portion configured to mount a crankshaft; a one-way clutch connected to the crankshaft; an output portion connected to the crankshaft via the one-way clutch and configured to be connected to drive wheels of the human-powered vehicle via a transmission member; an electric drive source including a motor and configured to transmit motor drive force of the motor to the transmission member; and a control portion for controlling the electric drive source, wherein the one-way clutch is configured to rotate when the crankshaft rotates in a first crank rotation direction and when the transmission member rotates in a first crank rotation direction. The crankshaft and the output part are configured to rotate integrally so as to rotate in a transmission member rotation direction, and are configured to allow relative rotation between the crankshaft and the output part when the crankshaft rotates in a second crank rotation direction opposite to the first crank rotation direction, and the control unit is configured to control the electric drive source so that when the crankshaft rotates in the first crank rotation direction, the transmission member rotates in the first transmission member rotation direction, and when the crankshaft rotates in the second crank rotation direction, the transmission member rotates in the second transmission member rotation direction opposite to the first transmission member rotation direction. According to the drive unit of the first aspect, when the crankshaft rotates in a first crank rotation direction, the control unit controls the electric drive source to rotate the transmission member in the first transmission member rotation direction, and when the crankshaft rotates in a second crank rotation direction, the control unit controls the electric drive source to rotate the transmission member in the second transmission member rotation direction. Therefore, the rotation of the transmission member can be suitably controlled in accordance with the rotation of the crankshaft. According to the drive unit of the first aspect, when the crankshaft rotates in the second crank rotation direction, the rotation of the transmission member in the second transmission member rotation direction is transmitted to the drive wheels, so that, for example, the drive wheels can be braked in a human-powered vehicle equipped with a coaster brake.

[0006] In the drive unit of the second aspect according to the first aspect of the present disclosure, the electric drive source is configured to transmit the motor drive force to the transmission member via the output portion. According to the drive unit of the second aspect, the motor driving force can be suitably transmitted to the transmission member via the output portion.

[0007] In the drive unit of a third aspect according to the first or second aspect of the present disclosure, the output portion is configured to be connected to the transmission member via a sprocket, a pulley, or a bevel gear. According to the drive unit of the third aspect, the motor driving force transmitted to the sprocket, pulley, or bevel gear is suitably transmitted to the transmission member.

[0008] In the drive unit of a fourth aspect according to the first aspect of the present disclosure, the electric drive source further includes a switching unit provided between the motor and the output unit and configured to switch the connection state between a first connection state and a second connection state, wherein when the connection state is the first connection state, the switching unit is capable of transmitting the motor driving force between the motor and the output unit, and when the connection state is the second connection state, the motor driving force is not capable of being transmitted between the motor and the output unit, and the control unit is configured to control the switching unit in the first connection state when the crankshaft rotates in the second crank rotation direction. According to the drive unit on the fourth side, the crankshaft is connected to the second crankshaft. Q times When the motor rotates in the rotation direction, the connection state of the switching unit is set to the first connection state, and the motor driving force is transmitted to the output unit.

[0009] In the drive unit of the fifth aspect according to the fourth aspect of the present disclosure, the control unit is configured to control the switching unit in the first connection state when the crankshaft rotates in the first crank rotation direction and the electric drive source applies propulsive force to the human-powered vehicle. According to the drive unit of the fifth aspect, when the crankshaft rotates in the first crank rotation direction, the connection state of the switching unit becomes the first connection state, so that the electric drive source can apply propulsive force to the human-powered vehicle.

[0010] In the drive unit of a sixth aspect according to the fourth or fifth aspect of the present disclosure, the control unit is configured to control the switching unit in the second connection state in at least one of the following cases: when the crankshaft rotates in the first crank rotation direction and the vehicle speed of the human-powered vehicle is equal to or less than a first vehicle speed; when the crankshaft rotates in the first crank rotation direction and the vehicle speed of the human-powered vehicle is equal to or greater than a second vehicle speed that is greater than the first vehicle speed; when the crankshaft rotates in the first crank rotation direction and the rotational speed of the crankshaft is equal to or less than the first rotational speed; when the crankshaft rotates in the first crank rotation direction and the human-powered driving force input to the crankshaft is equal to or less than a first human-powered driving force; and when the motor is stopped. In the drive unit of the sixth side, the connection state of the switching section is set to the second connection state in at least one of the following cases: when the crankshaft rotates in the first crank rotation direction and the vehicle speed of the human-powered vehicle is equal to or less than the first vehicle speed; when the crankshaft rotates in the first crank rotation direction and the vehicle speed of the human-powered vehicle is equal to or greater than the second vehicle speed; when the crankshaft rotates in the first crank rotation direction and the rotational speed of the crankshaft is equal to or less than the first rotational speed; when the crankshaft rotates in the first crank rotation direction and the human-powered driving force input to the crankshaft is equal to or less than the first human-powered driving force; and when the motor is stopped.

[0011] In the drive unit of a seventh aspect according to any one of the fourth to sixth aspects of the present disclosure, the switching unit includes an electromagnetic clutch. According to the drive unit of the seventh aspect, the connection state can be suitably switched by the electromagnetic clutch.

[0012] In the drive unit of an eighth aspect according to any one of the fourth to seventh aspects of the present disclosure, the electric drive source further includes a reducer, and the switching unit is provided in the reducer. According to the drive unit of the eighth aspect, the switching unit can switch the connection state in the reducer.

[0013] In a drive unit of a ninth aspect according to any one of the first to eighth aspects of the present disclosure, the control unit is configured to control the motor according to the amount of rotation of the crankshaft when the crankshaft rotates in the second crank rotation direction. According to the drive unit of the ninth aspect, when the crankshaft rotates in the second crank rotation direction, the motor is controlled according to the amount of rotation of the crankshaft, making it easy to operate the motor according to the rider's intentions.

[0014] In the drive unit of the tenth aspect according to the ninth aspect of the present disclosure, the control unit is configured to control the motor so that, when the crankshaft rotates in the second crank rotation direction, the greater the amount of rotation of the crankshaft, the greater the amount of rotation of the motor. According to the drive unit of the tenth aspect, when the crankshaft rotates in the second crank rotation direction, the motor is controlled so that the greater the amount of rotation of the crankshaft, the greater the amount of rotation of the motor, making it easy for the rider to adjust the amount of rotation of the motor.

[0015] In a drive unit of an eleventh aspect according to any one of the first to tenth aspects of the present disclosure, the control unit is configured to control the motor so that the driving torque of the motor is maintained below the first driving torque when the crankshaft rotates in the second crank rotation direction. According to the drive unit of the eleventh aspect, when the crankshaft rotates in the second crank rotation direction, the force applied to the transmission body is limited, thereby reducing the load on the transmission body.

[0016] In a drive unit of a twelfth aspect according to any one of the first to eleventh aspects of the present disclosure, the control unit is configured to stop the motor after a predetermined time has elapsed since the motor stopped rotating when the motor does not rotate due to a load applied to the motor. According to the drive unit of the twelfth aspect, if the motor does not rotate due to the load applied to the motor, the force applied to the transmission body is released after a predetermined time has elapsed since the motor stopped rotating, thereby reducing the load on the transmission body.

[0017] In a drive unit of a thirteenth aspect according to any one of the first to twelfth aspects of the present disclosure, the control unit is configured to control the motor so that, when the crankshaft rotates in the second crank rotation direction and the transmission member is rotated in the second transmission member rotation direction by the electric drive source, the electric drive source applies a driving force to the transmission member in the second transmission member rotation direction until the crankshaft rotates in the first crank rotation direction. According to the drive unit of the thirteenth aspect, when the crankshaft rotates in the second crank rotation direction, the electric drive source controls the motor to impart a driving force to the transmission member in the second transmission member rotation direction until the crankshaft rotates in the first crank rotation direction, making it easy to operate the motor according to the rider's intentions.

[0018] In the drive unit of a fourteenth aspect according to any one of the first to thirteenth aspects of the present disclosure, the output portion is disposed coaxially with the crankshaft. According to the drive unit of the fourteenth aspect, in a drive unit having an output section arranged coaxially with the crankshaft, the rotation of the transmission member can be suitably controlled in accordance with the rotation of the crankshaft.

[0019] A drive system according to a fifteenth aspect of the present disclosure is a drive system for a human-powered vehicle, and includes a drive unit according to any one of the first to fourteenth aspects, and a coaster brake provided on the drive wheel. According to the drive system of the fifteenth aspect, in a drive system having coaster brakes provided on drive wheels, the coaster brakes can be suitably controlled in accordance with the rotation of the crankshaft.

[0020] A human-powered vehicle according to a sixteenth aspect of the present disclosure includes the drive system according to the fifteenth aspect. According to the human-powered vehicle of the sixteenth aspect, the coaster brake can be suitably controlled in accordance with the rotation of the crankshaft. [Effects of the Invention]

[0021] The drive unit for a human-powered vehicle, the drive system for a human-powered vehicle, and the human-powered vehicle of the present disclosure can suitably control the rotation of the transmission member in accordance with the rotation of the crankshaft. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a block diagram showing a transmission path of driving force for a human-powered vehicle, including a drive unit for a human-powered vehicle and a drive system for a human-powered vehicle according to an embodiment; [Figure 2] 1 is a block diagram showing the electrical configuration of a human-powered vehicle including a drive unit for a human-powered vehicle and a drive system for a human-powered vehicle according to an embodiment. [Figure 3] FIG. 2 is a side view of the drive unit of FIG. 1. [Figure 4] FIG. 4 is a cross-sectional view taken along line D4-D4 in FIG. 3. [Figure 5] 3 is a first part of a flowchart of a process executed by the control unit of FIG. 2 to control the electric drive source. [Figure 6] 3 is a second part of a flowchart of a process executed by the control unit of FIG. 2 to control the electric drive source. [Figure 7] 3 is a third part of the flowchart of the process executed by the control unit of FIG. 2 to control the electric drive source. [Figure 8] 3 is a flowchart of a process executed by the control unit of FIG. 2 to control the motor in accordance with the load applied to the motor. [Figure 9] FIG. 10 is a block diagram showing a transmission path of driving force for a human-powered vehicle, including a drive unit for a human-powered vehicle and a drive system for a human-powered vehicle according to a modified example. [Figure 10]FIG. 10 is a cross-sectional view of the drive unit for the human-powered vehicle of FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0023] <Embodiment> With reference to FIGS. 1 to 9 , a human-powered vehicle 10, a drive system 40 for the human-powered vehicle, and a drive unit 50 for the human-powered vehicle are described. A human-powered vehicle is a vehicle that has at least one wheel and can be propelled at least by human-powered force. Human-powered vehicles include various types of bicycles, such as mountain bikes, road bikes, city bikes, cargo bikes, hand bikes, and recumbent bikes. The number of wheels a human-powered vehicle has is not limited. Human-powered vehicles also include, for example, one-wheeled vehicles and vehicles with two or more wheels. Human-powered vehicles are not limited to vehicles that can be propelled solely by human-powered force. Human-powered vehicles include E-bikes that use not only human-powered force but also the driving force of an electric motor for propulsion. E-bikes include electrically assisted bicycles whose propulsion is assisted by an electric motor. In the following embodiments, the human-powered vehicle will be described as an electrically assisted bicycle.

[0024] The human-powered vehicle 10 includes at least one wheel and a vehicle body. The at least one wheel includes a front wheel and a rear wheel 12. The vehicle body includes a frame. The human-powered vehicle 10 further includes a crank to which human-powered driving force is input. The crank includes a crankshaft 14 that is rotatable relative to the frame, and crank arms. The crank arms are provided at the axial ends of the crankshaft 14. Pedals are connected to the crank arms.

[0025] A front fork is connected to the frame. A front wheel is attached to the front fork. A handlebar is connected to the front fork via a stem. A rear wheel 12 is supported by the frame. In this embodiment, the rear wheel 12 is a drive wheel 16. For example, a crank is connected to the rear wheel 12 by a drive mechanism. The rear wheel 12 is driven by the rotation of the crankshaft 14. At least one of the front wheel and the rear wheel 12 may be connected to the crank by a drive mechanism.

[0026] The drive mechanism includes a first rotating body 18 coupled to the crankshaft 14. For example, the first rotating body 18 includes a front sprocket. The first rotating body 18 may include a pulley or a bevel gear. The drive mechanism further includes a second rotating body 20 and a transmission member 22. The transmission member 22 is configured to transmit the rotational force of the first rotating body 18 to the second rotating body 20. For example, the transmission member 22 includes a chain. The transmission member 22 may include a belt or a shaft. For example, the second rotating body 20 includes a rear sprocket. The second rotating body 20 may include a pulley or a bevel gear.

[0027] For example, the chain is wound around a front sprocket and a rear sprocket. For example, the second rotating body 20 is connected to the rear wheel 12 via a hub 24. The rear wheel 12 is configured to rotate in conjunction with the rotation of the second rotating body 20. The torque transmitted to the rear sprocket is transmitted to the rear wheel 12 via the hub 24.

[0028] For example, the human-powered vehicle 10 further includes a battery 26. The battery 26 includes one or more battery elements. The battery element includes a rechargeable battery. For example, the battery 26 is configured to supply power to the drive unit 50. The battery 26 is communicatively connected to the drive unit 50 via an electric cable or a wireless communication device. The battery 26 can communicate with the drive unit 50 via, for example, power line communication (PLC), a controller area network (CAN), or a universal asynchronous receiver / transmitter (UART).

[0029] The human-powered vehicle 10 includes a drive system 40 for the human-powered vehicle. The drive system 40 for the human-powered vehicle includes a drive unit 50 for the human-powered vehicle and a coaster brake 42 provided on the drive wheel 16. For example, the coaster brake 42 is provided on the hub 24 of the drive wheel 16. For example, the coaster brake 42 applies a braking force to the drive wheel 16. For example, the coaster brake 42 is configured to apply a braking force to the human-powered vehicle 10 when a rotational torque in the opposite direction to when the human-powered vehicle 10 moves forward is transmitted to the second rotating body 20. For example, the coaster brake 42 is configured to apply a braking force to the drive wheel 16 by the driving force of the electric drive source 58. The hub 24 provided with the coaster brake 42 may be a hub with a gear, such as Shimano's SG-3C41 and SG-C6001-8C.

[0030] The drive unit 50 for a human-powered vehicle includes a crankshaft attachment portion 52, a one-way clutch 54, an output portion 56, an electric drive source 58, and a control portion 60 that controls the electric drive source 58. The drive unit 50 may further include a crankshaft 14.

[0031] For example, the drive unit 50 further includes a housing 62. The drive unit 50 has a mounting portion 62A for mounting to the frame of the human-powered vehicle 10. For example, the mounting portion 62A is provided on the outer periphery of the housing 62. The mounting portion 62A includes, for example, at least one of a hole and an internally threaded portion. For example, the housing 62 is mounted to the frame by a bolt engaging at least one of the hole and the internally threaded portion of the mounting portion 62A with the frame.

[0032] For example, the crankshaft mounting portion 52 is provided on the housing 62. The crankshaft mounting portion 52 is configured to mount the crankshaft 14. The crankshaft mounting portion 52 rotatably supports the crankshaft 14. For example, the crankshaft mounting portion 52 includes a first hole 52X and a second hole 52Y into which the crankshaft 14 is inserted. The first hole 52X and the second hole 52Y each communicate between the internal space of the housing 62 and the external space of the housing 62. The first hole 52X is formed in a first side surface portion 62B of the housing 62 in the axial direction of the crankshaft 14. The second hole 52Y is formed in a second side surface portion 62C of the housing 62 in the axial direction of the crankshaft 14.

[0033] For example, the output unit 56 has a first rotational center axis C1 and is configured to transmit the rotational force of the crankshaft 14. For example, the output unit 56 is disposed coaxially with the crankshaft 14. For example, the output unit 56 has a substantially cylindrical shape. For example, the output unit 56 is provided on the outer periphery of the crankshaft 14 around the first rotational center axis C1. The output unit 56 is connected to the crankshaft 14 via a one-way clutch 54. The one-way clutch 54 is connected to the crankshaft 14. The output unit 56 is configured to be connected to the drive wheels 16 of the human-powered vehicle 10 via a transmission member 22. For example, the output unit 56 is configured to be connected to the transmission member 22 via the second rotating body 20. For example, the output unit 56 is configured to be connected to the transmission member 22 via a sprocket, pulley, or bevel gear that constitutes the second rotating body 20.

[0034] For example, the crankshaft 14 is provided with a power transmission member 64. For example, the power transmission member 64 is configured to transmit rotational force input to the crankshaft 14 to the output portion 56. For example, the power transmission member 64 has a substantially cylindrical shape. For example, the power transmission member 64 is disposed so as to surround the outer periphery of the crankshaft 14 around the first central axis of rotation C1.

[0035] For example, a first axial end 14A of the crankshaft 14 protrudes from the second hole 52Y into the external space of the housing 62. For example, a second axial end 14B of the crankshaft 14 protrudes from the first hole 52X into the external space of the housing 62. For example, a first bearing 62D is disposed in the second hole 52Y. For example, the crankshaft 14 is supported in the housing 62 by the first bearing 62D so as to be rotatable relative to the housing 62. For example, the first bearing 62D may be a ball bearing, a roller bearing, or a plain bearing.

[0036] For example, a second bearing 62E is disposed in the first hole 52X. For example, the output portion 56 is provided in the housing 62 by the second bearing 62E so as to be rotatable relative to the housing 62. For example, the second bearing 62E is provided on the outer periphery of the output portion 56. For example, a third bearing 62F is provided between the inner periphery of the output portion 56 and the outer periphery of the crankshaft 14. For example, the output portion 56 rotatably supports the crankshaft 14 via the third bearing 62F. The second bearing 62E may be a ball bearing, a roller bearing, or a plain bearing. The third bearing 62F includes, for example, a needle bearing or a sleeve.

[0037] For example, in a direction perpendicular to first central axis of rotation C1, at least a portion of second bearing 62E is disposed to overlap third bearing 62F. For example, in a direction parallel to first central axis of rotation C1, output portion 56 has third end 56A. For example, a connecting portion that connects first rotor 18 is provided on the outer periphery of third end 56A. For example, the connecting portion has one or more splines that extend along the axial direction of crankshaft 14.

[0038] The electric drive source 58 includes a motor 58A. The electric drive source 58 is configured to transmit the motor drive force of the motor 58A to the transmission member 22. For example, the electric drive source 58 is configured to transmit the motor drive force to the transmission member 22 via the output unit 56. For example, the motor 58A is provided in a housing 62. For example, the motor 58A is configured to provide propulsive force to the human-powered vehicle 10. The motor 58A includes one or more electric motors. The electric motor is, for example, a brushless motor. For example, the electric motor is an inner rotor type motor. For example, the motor 58A is configured to transmit rotation to the first rotating body 18.

[0039] For example, motor 58A includes a motor output shaft 58B. For example, crankshaft 14 and motor output shaft 58B are disposed substantially parallel to each other. For example, housing 62 functions as a case for motor 58A. Motor 58A may have a case formed separately from housing 62. When motor 58A has a case, the case for motor 58A may be attached to housing 62. The case for motor 58A may be attached to the outer periphery of housing 62.

[0040] For example, the housing 62 includes a first housing 62G, a second housing 62H, and a cover member 62K. The first housing 62G includes a first side surface portion 62B. The second housing 62H includes a second side surface portion 62C. For example, the first housing 62G and the second housing 62H form an internal space. For example, the first housing 62G and the second housing 62H are attached to each other with bolts.

[0041] At least a portion of the crankshaft 14, at least a portion of the output unit 56, the power transmission member 64, the electric drive source 58, the control unit 60, etc. are arranged in the internal space of the housing 62. For example, the first housing 62G functions as a case for the motor 58A. The cover member 62K is provided on the first housing 62G and, together with the first housing 62G, forms a motor arrangement space. The cover member 62K is attached to the first housing 62G by, for example, bolts.

[0042] The one-way clutch 54 is configured so that the crankshaft 14 and the output portion 56 rotate together when the crankshaft 14 rotates in a first crank rotation direction, causing the transmission member 22 to rotate in the first transmission member rotation direction, and so that the crankshaft 14 and the output portion 56 can rotate relative to each other when the crankshaft 14 rotates in a second crank rotation direction opposite to the first crank rotation direction. For example, the one-way clutch 54 includes a roller clutch, a sprag clutch, or a ratchet clutch. For example, at least a portion of the one-way clutch 54 is disposed between an inner periphery of the output portion 56 and an outer periphery of the crankshaft 14. For example, the first crank rotation direction corresponds to the rotation direction of the crankshaft 14 when the crankshaft 14 is rotated to move the human-powered vehicle 10 forward.

[0043] For example, the electric drive source 58 further includes a switching unit 66. For example, the switching unit 66 is provided between the motor 58A and the output unit 56. For example, the switching unit 66 is configured to switch the connection state between a first connection state and a second connection state. For example, when the connection state is the first connection state, the switching unit 66 is capable of transmitting the motor driving force between the motor 58A and the output unit 56. For example, when the connection state is the second connection state, the switching unit 66 is unable to transmit the motor driving force between the motor 58A and the output unit 56. For example, the switching unit 66 includes an electromagnetic clutch 66A. The switching unit 66 may include a two-way clutch.

[0044] For example, the electric drive source 58 further includes a reducer 68. For example, the reducer 68 includes at least one reduction portion. For example, the at least one reduction portion includes a first reduction portion 70, a second reduction portion 72, and a third reduction portion 74. The reducer 68 may include one, two, or four or more reduction portions. The first reduction portion 70 includes a first gear 70A, a first rotating shaft 70B, and a second gear 70C. The diameter of the first gear 70A is larger than the diameter of the second gear 70C. For example, the first gear 70A is formed integrally with the output portion 56. For example, the first gear 70A is provided on the outer periphery of the output portion 56. The first gear 70A and the output portion 56 may be formed separately and attached so as to be non-rotatable relative to each other. For example, the first rotating shaft 70B has a second rotational axis C2 different from the first rotational axis C1. For example, the second central axis of rotation C2 is substantially parallel to the first central axis of rotation C1.

[0045] For example, the second gear 70C is provided on the first rotating shaft 70B. For example, the second gear 70C is formed in an annular shape and is disposed radially outward of the first rotating shaft 70B. For example, the second gear 70C is connected to the first gear 70A. The first reduction gear portion 70 may be indirectly connected by a belt and a pulley instead of the first gear 70A and the second gear 70C. The first reduction gear portion 70 may be indirectly connected by a belt and a pulley instead of the first gear 70A and the second gear 70C. ,vinegar Procket and Chain N Therefore, they may be indirectly connected.

[0046] For example, the first rotating shaft 70B is supported by the housing 62 via a fourth bearing 62M and a fifth bearing 62N so as to be rotatable relative to the housing 62. For example, the fourth bearing 62M is provided in the first housing 62G. For example, the fifth bearing 62N is provided in the second housing 62H. For example, the fourth bearing 62M and the fifth bearing 62N support both axial ends of the first rotating shaft 70B, respectively. For example, the fourth bearing 62M and the fifth bearing 62N may be ball bearings, roller bearings, or plain bearings. For example, the first rotating shaft 70B supports the second gear 70C. For example, the first rotating shaft 70B is arranged coaxially with the second gear 70C.

[0047] For example, the second reduction gear portion 72 is provided between the motor 58A and the first reduction gear portion 70. For example, the second reduction gear portion 72 includes a third gear 72A, a second rotating shaft 72B, and a fourth gear 72C. For example, the diameter of the third gear 72A is larger than the diameter of the fourth gear 72C. For example, the third gear 72A is provided on the first rotating shaft 70B. For example, the third gear 72A is configured to rotate integrally with the first rotating shaft 70B. For example, the third gear 72A has a diameter larger than that of the second gear 70C. Large For example, the third gear 72A and the first rotating shaft 70B may be formed separately and attached so as to be unable to rotate relative to each other. The third gear 72A and the first rotating shaft 70B may also be formed integrally.

[0048] For example, the second gear 70C and the third gear 72A are disposed between the fourth bearing 62M and the fifth bearing 62N in the axial direction of the first rotation shaft 70B. For example, the second gear 70C is disposed adjacent to the fourth bearing 62M. For example, the third gear 72A is disposed adjacent to the fifth bearing 62N.

[0049] For example, the fourth gear 72C is configured to rotate integrally with the second rotation shaft 72B. For example, the fourth gear 72C is connected to the third gear 72A. For example, the fourth gear 72C is formed integrally with the second rotation shaft 72B. The fourth gear 72C and the second rotation shaft 72B may be formed separately and attached so as to be unable to rotate relative to each other.

[0050] For example, the second rotation shaft 72B has a third rotation center axis C3 that is different from the first rotation center axis C1 and the second rotation center axis C2. For example, the third rotation center axis C3 is substantially parallel to the first rotation center axis C1 and the second rotation center axis C2. The second reduction gear portion 72 may be indirectly connected by a belt and a pulley instead of the third gear 72A and the fourth gear 72C. The second reduction gear portion 72 may be indirectly connected by a sprocket and a chain instead of the third gear 72A and the fourth gear 72C.

[0051] For example, the second rotating shaft 72B is supported by the housing 62 via a sixth bearing 62P and a seventh bearing 62Q so as to be rotatable relative to the housing 62. For example, the sixth bearing 62P is provided in the second housing 62H. For example, the seventh bearing 62Q is provided in the cover member 62K. The sixth bearing 62P and the seventh bearing 62Q may be ball bearings, roller bearings, or plain bearings.

[0052] For example, the third reduction gear portion 74 includes a fifth gear 74A and a sixth gear 74B. For example, the diameter of the fifth gear 74A is larger than the diameter of the sixth gear 74B. For example, the fifth gear 74A is disposed on the cover member 62K side with respect to the fourth gear 72C in the axial direction of the crankshaft 14. For example, the fifth gear 74A is provided on the second rotating shaft 72B so as to rotate integrally with the second rotating shaft 72B. For example, the fifth gear 74A is formed separately from the second rotating shaft 72B and attached to the second rotating shaft 72B. The fifth gear 74A may also be formed integrally with the second rotating shaft 72B.

[0053] For example, the fourth gear 72C and the fifth gear 74A are disposed between the sixth bearing 62P and the seventh bearing 62Q in the axial direction of the second rotation shaft 72B. For example, the fourth gear 72C is disposed adjacent to the sixth bearing 62P. For example, the fifth gear 74A is disposed adjacent to the seventh bearing 62Q.

[0054] For example, the sixth gear 74B is provided on the motor output shaft 58B so as to rotate integrally with the motor output shaft 58B. For example, the sixth gear 74B may be formed integrally with the motor output shaft 58B. For example, the sixth gear 74B may be formed separately from the motor output shaft 58B and attached to the motor output shaft 58B. The third reduction gear portion 74 may be indirectly connected by a belt and a pulley instead of the fifth gear 74A and the sixth gear 74B. The third reduction gear portion 74 may be indirectly connected by a sprocket and a chain instead of the fifth gear 74A and the sixth gear 74B.

[0055] For example, motor output shaft 58B has a fourth rotational center axis C4. For example, fourth rotational center axis C4 is different from first rotational center axis C1, second rotational center axis C2, and third rotational center axis C3. For example, fourth rotational center axis C4 is substantially parallel to first rotational center axis C1, second rotational center axis C2, and third rotational center axis C3. For example, motor output shaft 58B is supported by housing 62 via eighth bearing 62R and ninth bearing 62S so as to be rotatable relative to housing 62. Eighth bearing 62R and ninth bearing 62S may be ball bearings, roller bearings, or plain bearings.

[0056] For example, the eighth bearing 62R is provided in the cover member 62K. For example, the ninth bearing 62S is provided in the first housing 62G. For example, the eighth bearing 62R supports an intermediate portion between the fourth end 58C and the fifth end 58D in the axial direction of the motor output shaft 58B. For example, the ninth bearing 62S supports the fifth end 58D of the motor output shaft 58B in the axial direction of the motor output shaft 58B.

[0057] For example, the switching unit 66 is provided in the reducer 68. For example, the switching unit 66 is provided in the first reduction gear portion 70. For example, the switching unit 66 is provided between the outer periphery of the first rotating shaft 70B and the inner periphery of the second gear 70C. The switching unit 66 may be provided in the second reduction gear portion 72 or the third reduction gear portion 74. When the switching unit 66 includes the electromagnetic clutch 66A, for example, the first connected state corresponds to a state in which the outer periphery of the first rotating shaft 70B and the inner periphery of the second gear 70C are connected and the outer periphery of the first rotating shaft 70B and the inner periphery of the second gear 70C are able to rotate integrally. When the switching unit 66 includes the electromagnetic clutch 66A, an outer periphery of the first rotating shaft 70B; The state in which the connection with the inner peripheral portion of the second gear 70C is released and the outer peripheral portion of the first rotating shaft 70B and the inner peripheral portion of the second gear 70C become relatively rotatable corresponds to the second connected state.

[0058] The switching unit 66 may be provided on one of the outer periphery of the first rotating shaft 70B and the inner periphery of the second gear 70C, and may include an engagement portion that is movable relative to the other of the outer periphery of the first rotating shaft 70B and the inner periphery of the second gear 70C. The movement of the engagement portion switches the connection state of the switching unit 66 between a first connection state and a second connection state. The location where the switching unit 66 is provided and the configuration of the switching unit 66 can be changed as appropriate.

[0059] For example, in the case where the switching unit 66 includes the electromagnetic clutch 66A, when the electromagnetic clutch 66A is turned on by energizing the electromagnetic clutch 66A, the engaging portion allows the outer circumferential portion of the first rotating shaft 70B and the inner circumferential portion of the second gear 70C to rotate together. For example, in the case where the switching unit 66 includes the electromagnetic clutch 66A, when the electromagnetic clutch 66A is turned off by de-energizing the electromagnetic clutch 66A, the engaging portion allows the outer circumferential portion of the first rotating shaft 70B and the inner circumferential portion of the second gear 70C to rotate relative to each other.

[0060] If the switching unit 66 includes an electromagnetic clutch 66A, when the electromagnetic clutch 66A is turned off, the engaging unit allows the outer periphery of the first rotating shaft 70B and the inner periphery of the second gear 70C to rotate together, and when the electromagnetic clutch 66A is turned on, the engaging unit allows the outer periphery of the first rotating shaft 70B and the inner periphery of the second gear 70C to rotate relative to each other.

[0061] For example, the human-powered vehicle 10 further includes a human-powered driving force detection unit 28. For example, the human-powered driving force detection unit 28 includes a torque sensor. For example, the torque sensor is configured to output a signal corresponding to the torque applied to the crankshaft 14 by the human-powered driving force. For example, the signal corresponding to the torque applied to the crankshaft 14 by the human-powered driving force includes information related to the human-powered driving force input to the human-powered vehicle 10.

[0062] For example, the torque sensor is provided near the crankshaft 14. For example, the torque sensor is provided upstream of the one-way clutch 54 in the transmission path of the manual driving force. For example, the torque sensor is provided on at least one of the crankshaft 14, the crank arm, and the pedal. For example, the torque sensor includes a strain sensor, a magnetostrictive sensor, or a pressure sensor. For example, the strain sensor includes a strain gauge. For example, the torque sensor may have any configuration as long as it can acquire information about the manual driving force. For example, the torque sensor may include a sensor that detects the pressure applied to the pedal, or a sensor that detects the tension of the chain.

[0063] For example, the torque sensor is configured to output a detection signal a predetermined number of times during one rotation of the crankshaft 14. For example, the predetermined number of times is 2 or more. For example, the predetermined number of times is 4 or more. For example, the predetermined number of times is a multiple of 4. For example, the predetermined number of times is 8, 12, or 16.

[0064] For example, the human-powered vehicle 10 further includes a crank rotation angle detection unit 30. The crank rotation angle detection unit 30 includes a crank rotation sensor. The crank rotation sensor is configured to detect information corresponding to the rotation speed of the crankshaft 14. The information corresponding to the rotation speed of the crankshaft 14 includes the angular acceleration of the crankshaft 14. The acceleration of the human-powered vehicle 10 is, for example, the angular acceleration of the crankshaft 14. The crank rotation sensor outputs a signal corresponding to the rotation speed of the crankshaft 14.

[0065] The crank rotation sensor includes a magnetic sensor that outputs a signal according to the strength of a magnetic field. The magnetic sensor includes an annular magnet whose magnetic field strength varies in the circumferential direction. The annular magnet whose magnetic field strength varies in the circumferential direction is connected to the crankshaft 14, a member that rotates in conjunction with the crankshaft 14, or, is provided in the transmission path from the crankshaft 14 to the first rotating body 18. For example, the magnet may be provided in a member that rotates integrally with the crankshaft 14 in the transmission path of the manual driving force from the crankshaft 14 to the first rotating body 18. For example, the magnet may be provided in the electric driving source 58. The crank rotation sensor may include an optical sensor, an acceleration sensor, a gyro sensor, a torque sensor, or the like instead of a magnetic sensor.

[0066] For example, the crank rotation sensor may be configured such that, when the crank rotates in a first direction from the reference phase of the crank during one rotation of the crank, the output value increases in accordance with the amount of rotation of the crank. For example, the crank rotation sensor may be configured such that, when the crank rotates in the first direction from the reference phase of the crank, the output value increases in accordance with the amount of rotation of the crank during a half rotation of the crank, and when the crank rotates in a second direction from the reference phase of the crank, the output value decreases in accordance with the amount of rotation of the crank during a half rotation of the crank. The crank rotation sensor may be configured to include a vehicle speed sensor. For example, when the crank rotation sensor includes the vehicle speed sensor, the control unit 60 may be configured to calculate the rotation speed of the crank according to the vehicle speed detected by the vehicle speed sensor and the gear ratio.

[0067] For example, the human-powered vehicle 10 further includes a vehicle speed detection unit 32. For example, the vehicle speed detection unit 32 is configured to detect information corresponding to the rotation speed of the wheels of the human-powered vehicle 10. For example, the information corresponding to the rotation speed of the wheels of the human-powered vehicle 10 includes the vehicle speed. For example, the vehicle speed detection unit 32 is configured to detect magnets provided on the wheels of the human-powered vehicle 10. For example, the vehicle speed sensor outputs a signal corresponding to the rotation speed of the wheels of the human-powered vehicle 10.

[0068] For example, the vehicle speed detection unit 32 includes a magnetic reed that constitutes a reed switch, or a Hall element. For example, the vehicle speed detection unit 32 is attached to a chain stay of the frame of the human-powered vehicle 10. For example, the vehicle speed detection unit 32 is configured to detect a magnet attached to the rear wheel 12. For example, the vehicle speed sensor may be provided on the front fork. For example, if the vehicle speed sensor is provided on the front fork, it may be configured to detect a magnet attached to the front wheel.

[0069] For example, the control unit 60 can calculate the vehicle speed of the human-powered vehicle 10 based on the rotational speed of the wheels and information related to the circumference of the wheels. For example, the circumference of the wheels is the circumference of the tires. The memory unit 78 stores information related to the circumference of the wheels.

[0070] For example, the vehicle speed detection unit 32 may be configured to include an optical sensor or the like. For example, the vehicle speed detection unit 32 is configured to output a detection signal a predetermined number of times during one rotation of the wheel. For example, the predetermined number of times is two or more. For example, the predetermined number of times is four or more. For example, the predetermined number of times is a multiple of four. For example, the predetermined number of times is eight, twelve, or sixteen. For example, the vehicle speed detection unit 32 is configured so that the reed switch detects the magnet two or more times when the wheel rotates once.

[0071] For example, the human-powered vehicle 10 further includes a motor rotation angle detection unit 34. For example, the motor rotation angle detection unit 34 is configured to detect the rotation speed of at least one of the rotor of the motor 58A and the motor output shaft 58B. For example, the motor rotation angle detection unit 34 includes a magnetic pole sensor. The magnetic pole sensor is provided in the drive unit 50 near the motor 58A. The magnetic pole sensor is configured to be able to detect the rotation angle of the motor 58A.

[0072] For example, the control unit 60 is provided in a control device 76 provided in the drive unit 50. The control unit 60 includes an arithmetic processing device that executes a predetermined control program. The arithmetic processing device included in the control unit 60 includes, for example, a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). The arithmetic processing devices included in the control unit 60 may be provided in multiple locations that are separate from each other. The control unit 60 may include one or multiple microcomputers. The control unit 60 is connected to the battery 26 so as to be able to communicate with it via a wired or wireless connection. The control unit 60 is configured to be supplied with power from the battery 26.

[0073] For example, the control device 76 further includes a storage unit 78. The storage unit 78 stores various control programs and information used in various control processes. The storage unit 78 includes, for example, a nonvolatile memory and a volatile memory. The nonvolatile memory includes, for example, at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), and a flash memory. The volatile memory includes, for example, a random access memory (RAM).

[0074] For example, the control unit 60 is configured to be able to communicate with other devices via a wired or wireless connection. For example, the other devices include the battery 26, the manual driving force detection unit 28, the crank rotation angle detection unit 30, the vehicle speed detection unit 32, and the motor rotation angle detection unit 34. When the control unit 60 communicates with other devices via a wired connection, the control unit 60 communicates via, for example, power line communication (PLC), a controller area network (CAN), or a universal asynchronous receiver / transmitter (UART). When the control unit 60 communicates with other devices wirelessly, the control unit 60 communicates via, for example, Bluetooth (registered trademark), ANT+ (registered trademark), Wi-Fi (registered trademark), or infrared communication.

[0075] For example, the control device 76 further includes a drive circuit 80. The drive circuit 80 is electrically connected to the motor 58A. The drive circuit 80 controls the supply of power from the battery 26 to the motor 58A. The drive circuit 80 includes an inverter circuit. The inverter circuit includes a plurality of transistors. In one example, the inverter circuit includes a configuration in which a plurality of inverter units, each consisting of a pair of transistors connected in series, are connected in parallel. The inverter circuit may have a current sensor that detects the current flowing through the inverter circuit. The current sensor is connected to the control unit 60 so as to be able to communicate with the control unit 60 via wire or wirelessly.

[0076] The control unit 60 is configured to control the electric drive source 58 so that, when the crankshaft 14 rotates in a first crank rotation direction, the transmission member 22 rotates in the first transmission member rotation direction, and, when the crankshaft 14 rotates in a second crank rotation direction, the transmission member 22 rotates in a second transmission member rotation direction opposite to the first transmission member rotation direction. For example, when the crankshaft 14 rotates in the first crank rotation direction, the control unit 60 is configured to control the motor 58A and the switching unit 66 so that the transmission member 22 rotates in the first transmission member rotation direction. For example, when the crankshaft 14 rotates in the second crank rotation direction, the control unit 60 is configured to control the motor 58A and the switching unit 66 so that the transmission member 22 rotates in the second transmission member rotation direction. For example, the control unit 60 determines whether the crankshaft 14 is rotating in the first crank rotation direction or the second crank rotation direction by determining whether the output value of the crank rotation sensor increases or decreases.

[0077] For example, the control unit 60 is configured to control the switching unit 66 in the first connection state when the crankshaft 14 rotates in the first crank rotation direction and the electric drive source 58 applies a propulsive force to the human-powered vehicle 10. For example, the control unit 60 is configured to control the electromagnetic clutch 66A so that the electromagnetic clutch 66A is turned on when the crankshaft 14 rotates in the first crank rotation direction and the electric drive source 58 applies a propulsive force to the human-powered vehicle 10.

[0078] For example, when the crankshaft 14 rotates in a first crank rotation direction, the control unit 60 is configured to control the motor 58A in accordance with the state of the human-powered vehicle 10. For example, when the crankshaft 14 rotates in a first crank rotation direction, the control unit 60 is configured to control the motor 58A so as to change the propulsive force in accordance with the human-powered driving force input to the human-powered vehicle 10. For example, when the crankshaft 14 rotates in the first crank rotation direction, the control unit 60 is configured to control the motor 58A so as to increase the propulsive force as the human-powered driving force input to the human-powered vehicle 10 increases.

[0079] For example, the control unit 60 is configured to control the switching unit 66 in the first connection state when the crankshaft 14 rotates in the second crank rotation direction. For example, the control unit 60 is configured to control the electromagnetic clutch 66A so that the electromagnetic clutch 66A is turned on when the crankshaft 14 rotates in the second crank rotation direction.

[0080] For example, when the crankshaft 14 rotates in the second crank rotation direction, the control unit 60 is configured to control the motor 58A in accordance with the amount of rotation of the crankshaft 14. For example, when the crankshaft 14 rotates in the second crank rotation direction, the control unit 60 is configured to control the motor 58A so that the amount of rotation of the motor 58A increases as the amount of rotation of the crankshaft 14 increases. For example, when the crankshaft 14 rotates in the second crank rotation direction, the control unit 60 is configured to control the motor 58A so that the amount of rotation of the motor 58A decreases as the amount of rotation of the crankshaft 14 decreases.

[0081] For example, when the crankshaft 14 rotates in the second crank rotation direction, the control unit 60 is configured to control the motor 58A so that the drive torque of the motor 58A is maintained at or below the first drive torque. For example, the first drive torque is set to a value suitable for the coaster brake 42. For example, the first drive torque is set to a value that maximizes the braking force of the coaster brake 42 and prevents the braking force of the coaster brake 42 from increasing when a drive torque equal to or greater than the first drive torque is applied.

[0082] For example, when the crankshaft 14 rotates in the second crank rotation direction and the transmission member 22 is rotated in the second transmission member rotation direction by the electric drive source 58, the control unit 60 is configured to control the motor 58A so that the electric drive source 58 applies a driving force in the second transmission member rotation direction to the transmission member 22 until the crankshaft 14 rotates in the first crank rotation direction. For example, when the rotation of the crankshaft 14 in the second crank rotation direction stops, the control unit 60 is configured to control the motor 58A so that the electric drive source 58 applies a driving force in the second transmission member rotation direction to the transmission member 22 until the crankshaft 14 rotates in the first crank rotation direction. For example, the control unit 60 is configured to stop driving the motor 58A when the crankshaft 14 rotates in the first crank rotation direction after the rotation of the crankshaft 14 in the second crank rotation direction stops, so that the braking state of the human-powered vehicle 10 can be maintained by the coaster brake 42 while the human-powered vehicle 10 is stopped.

[0083] For example, the control unit 60 is configured to control the switching unit 66 in the second connection state in at least one of the following cases: when the crankshaft 14 rotates in the first crank rotation direction and the vehicle speed of the human-powered vehicle 10 is equal to or less than the first vehicle speed; when the crankshaft 14 rotates in the first crank rotation direction and the vehicle speed of the human-powered vehicle 10 is equal to or greater than a second vehicle speed that is greater than the first vehicle speed; when the crankshaft 14 rotates in the first crank rotation direction and the rotational speed of the crankshaft 14 is equal to or less than the first rotational speed; when the crankshaft 14 rotates in the first crank rotation direction and the human-powered driving force input to the crankshaft 14 is equal to or less than the first human-powered driving force; and when the motor 58A is stopped.

[0084] For example, the control unit 60 is configured to control the switching unit 66 in the second connection state when the crankshaft 14 rotates in a first crank rotation direction and the vehicle speed of the human-powered vehicle 10 is equal to or lower than a first vehicle speed. For example, the control unit 60 is configured to control the electromagnetic clutch 66A so that the electromagnetic clutch 66A is turned off when the crankshaft 14 rotates in a first crank rotation direction and the vehicle speed of the human-powered vehicle 10 is equal to or lower than the first vehicle speed. For example, the first vehicle speed is a value that can determine whether the human-powered vehicle 10 has stopped traveling. For example, the first vehicle speed is a speed in the range of 0 km / h to 8 km / h. For example, the first vehicle speed is 5 km / h.

[0085] For example, the control unit 60 is configured to control the switching unit 66 in the second connection state when the crankshaft 14 rotates in the first crank rotation direction and the vehicle speed of the human-powered vehicle 10 is equal to or greater than a second vehicle speed. For example, the control unit 60 is configured to control the electromagnetic clutch 66A so that the electromagnetic clutch 66A is turned off when the crankshaft 14 rotates in the first crank rotation direction and the vehicle speed of the human-powered vehicle 10 is equal to or greater than a second vehicle speed. For example, the control unit 60 stops the motor 58A when the vehicle speed of the human-powered vehicle 10 is equal to or greater than the second vehicle speed. For example, the second vehicle speed is set to a value that complies with laws and regulations. For example, the second vehicle speed is 24 km / h, 25 km / h, or 45 km / h.

[0086] For example, the control unit 60 is configured to control the switching unit 66 in the second connected state when the crankshaft 14 rotates in a first crank rotation direction and the rotational speed of the crankshaft 14 is equal to or lower than the first rotational speed. For example, the control unit 60 is configured to control the electromagnetic clutch 66A so that the electromagnetic clutch 66A is turned off when the crankshaft 14 rotates in a first crank rotation direction and the rotational speed of the crankshaft 14 is equal to or lower than the first rotational speed. For example, the first rotational speed is a value that can determine whether the human-powered vehicle 10 has stopped traveling. For example, the first rotational speed is 0 rpm or a value close to 0 rpm.

[0087] For example, the control unit 60 is configured to control the switching unit 66 in the second connection state when the crankshaft 14 rotates in the first crank rotation direction and the manual driving force input to the crankshaft 14 is equal to or less than the first manual driving force. For example, the control unit 60 is configured to control the electromagnetic clutch 66A so that the electromagnetic clutch 66A is turned off when the crankshaft 14 rotates in the first crank rotation direction and the manual driving force input to the crankshaft 14 is equal to or less than the first manual driving force.

[0088] For example, the control unit 60 is configured to control the switching unit 66 in the second connection state when the motor 58A is stopped. For example, the control unit 60 is configured to control the electromagnetic clutch 66A so that the electromagnetic clutch 66A is turned off when the motor 58A is stopped. For example, when the motor 58A is stopped, the assist mode is turned off. For example, the switching unit 66 is configured to set the connection state to the second connection state when the drive unit 50 is powered off or in at least one of the sleep mode and the drive unit 50 is powered off or in at least one of the sleep mode and the drive unit 50 is turned off. The switching unit 66 may also be configured to set the connection state to the first connection state when the drive unit 50 is powered off or in at least one of the sleep mode and the drive unit 50 is turned off.

[0089] 5 to 7, the process by which the control unit 60 controls the electric drive source 58 will be described. For example, when power is supplied to the control unit 60, the control unit 60 starts the process and proceeds to step S11 of the flowchart shown in Fig. 5. When the flowcharts of Fig. 5 to 7 end, the control unit 60 repeats the process from step S11 after a predetermined period, for example, until the supply of power is stopped.

[0090] In step S11, the control unit 60 determines whether or not the crankshaft 14 is rotating in the first crank rotation direction. If the crankshaft 14 is rotating in the first crank rotation direction, the control unit 60 proceeds to step S12. In step S12, the control unit 60 determines whether or not the electric drive source 58 is applying a propulsive force to the human-powered vehicle 10. If the electric drive source 58 is applying a propulsive force to the human-powered vehicle 10, the control unit 60 proceeds to step S13.

[0091] In step S13, the control unit 60 determines whether the connection state of the switching unit 66 is the first connection state. If the connection state of the switching unit 66 is not the first connection state, the control unit 60 proceeds to step S14. If the connection state is the first connection state, the control unit 60 proceeds to step S15. In step S14, the control unit 60 controls the switching unit 66 so that the connection state of the switching unit 66 becomes the first connection state, and proceeds to step S15. In step S15, the control unit 60 controls the switching unit 66 in the first connection state, and proceeds to step S16. For example, in step S15, the control unit 60 controls the switching unit 66 so that the first connection state is maintained. In step S16, the control unit 60 controls the electric drive source 58 so that the transmission member 22 rotates in the first transmission member rotation direction, and ends the process.

[0092] In step S11, if the crankshaft 14 is not rotating in the first crank rotation direction, the control unit 60 proceeds to step S17. In step S17, the control unit 60 determines whether or not the crankshaft 14 is rotating in the second crank rotation direction. If the crankshaft 14 is rotating in the second crank rotation direction, the control unit 60 proceeds to step S18. If the crankshaft 14 is not rotating in the second crank rotation direction, the control unit 60 ends the processing. In step S18, the control unit 60 determines whether or not the connection state of the switching unit 66 is the first connection state. If the connection state of the switching unit 66 is not the first connection state, the control unit 60 proceeds to step S19. If the connection state of the switching unit 66 is the first connection state, the control unit 60 proceeds to step S20.

[0093] In step S19, the control unit 60 controls the switching unit 66 so that the connection state of the switching unit 66 becomes the first connection state, and then the process proceeds to step S20. In step S20, the control unit 60 controls the switching unit 66 in the first connection state, and then the process proceeds to step S21. For example, in step S20, the control unit 60 controls the switching unit 66 so that the first connection state is maintained. In step S21, the control unit 60 controls the electric drive source 58 so that the transmission member 22 rotates in the second transmission member rotation direction, and then the process ends.

[0094] If the electric drive source 58 is not providing a propulsive force to the human-powered vehicle 10 in step S12, the control unit 60 proceeds to step S22. In step S22, the control unit 60 determines whether the vehicle speed is equal to or less than a first vehicle speed. If the vehicle speed is greater than the first vehicle speed, the control unit 60 proceeds to step S23. If the vehicle speed is equal to or less than the first vehicle speed, the control unit 60 proceeds to step S27.

[0095] In step S23, the control unit 60 determines whether the vehicle speed is equal to or greater than the second vehicle speed. If the vehicle speed is lower than the second vehicle speed, the control unit 60 proceeds to step S24. If the vehicle speed is equal to or greater than the second vehicle speed, the control unit 60 proceeds to step S27.

[0096] In step S24, the control unit 60 determines whether the rotation speed of the crankshaft 14 is equal to or less than the first rotation speed. If the rotation speed of the crankshaft 14 is greater than the first rotation speed, the control unit 60 proceeds to step S25.

[0097] In step S25, the control unit 60 determines whether the manual driving force input to the crankshaft 14 is equal to or less than the first manual driving force. If the manual driving force input to the crankshaft 14 is greater than the first manual driving force, the control unit 60 proceeds to step S26. If the manual driving force input to the crankshaft 14 is equal to or less than the first manual driving force, the control unit 60 proceeds to step S27.

[0098] In step S26, the control unit 60 determines whether the rotation of the motor 58A has stopped. If the motor 58A is rotating, the control unit 60 ends the process. If the rotation of the motor 58A has stopped, the control unit 60 proceeds to step S27.

[0099] If the processing of steps S22, S23, S24, S25, and S26 determines that the vehicle speed is equal to or lower than the first vehicle speed, the vehicle speed is equal to or higher than the second vehicle speed, the rotational speed of the crankshaft 14 is equal to or lower than the first rotational speed, the manual driving force input to the crankshaft 14 is equal to or lower than the first manual driving force, or the motor 58A is stopped, the control unit 60 proceeds to step S27. The control unit 60 may be configured to perform at least one of the processing of steps S22 to S26. With regard to the processing of steps S22 to S26, at least one of the processing of steps S22 to S26 may be deleted or the order of the processing may be reversed.

[0100] In step S27, the control unit 60 determines whether the connection state of the switching unit 66 is the second connection state. If the connection state of the switching unit 66 is not the second connection state, the control unit 60 proceeds to step S28. If the connection state of the switching unit 66 is the second connection state, the control unit 60 proceeds to step S29. In step S28, the control unit 60 controls the switching unit 66 so that the connection state of the switching unit 66 becomes the second connection state, and proceeds to step S29. In step S29, the control unit 60 controls the switching unit 66 in the second connection state and ends the processing. For example, in step S29, the control unit 60 controls the switching unit 66 so that the second connection state is maintained.

[0101] For example, when a load applied to motor 58A prevents motor 58A from rotating, control unit 60 is configured to stop motor 58A after a predetermined time has elapsed since motor 58A stopped rotating. The predetermined time is, for example, one second or more and three seconds or less. Examples of cases in which motor 58A does not rotate due to a load applied to motor 58A include cases in which the driving force of motor 58A is not transmitted to drive wheels 16 due to an external force applied to a member included in a transmission path of the driving force of motor 58A.

[0102] For example, when the crankshaft 14 rotates in the second crank rotation direction and the transmission member 22 is rotated in the second transmission member rotation direction by the electric drive source 58, if the motor 58A does not rotate due to the load applied to the motor 58A, the control unit 60 is configured to stop the motor 58A after a predetermined time has elapsed since the motor 58A stopped rotating. When the crankshaft 14 rotates in the second crank rotation direction and the transmission member 22 is rotated in the second transmission member rotation direction by the electric drive source 58, the state in which the motor 58A does not rotate due to the load applied to the motor 58A can be, for example, Transmission parts When the motor output shaft 58B outputs a second torque so as to rotate in the rotation direction, a load equal to or greater than the second torque is applied in a direction that suppresses the rotation of the motor 58A. Motor 58A Includes the given state.

[0103] For example, when the crankshaft 14 rotates in the first crank rotation direction and the transmission member 22 rotates in the first transmission member rotation direction by the electric drive source 58, if the motor 58A does not rotate due to a load applied to the motor 58A, the control unit 60 is configured to stop the motor 58A after a predetermined time has elapsed since the motor 58A stopped rotating. When the crankshaft 14 rotates in the first crank rotation direction and the transmission member 22 rotates in the first transmission member rotation direction by the electric drive source 58, the state in which the motor 58A does not rotate due to a load applied to the motor 58A is, for example, when the motor output shaft 58B outputs a first torque to impart a propulsive force to the human-powered vehicle 10, and a load of more than the first torque is applied in a direction that inhibits the rotation of the motor 58A. Motor 58A Includes the given state.

[0104] A process in which the control unit 60 controls the motor 58A in accordance with the load applied to the motor 58A will be described with reference to Fig. 8. For example, when power is supplied to the control unit 60, the control unit 60 starts the process and proceeds to step S31 of the flowchart shown in Fig. 8. When the flowchart of Fig. 8 ends, the control unit 60 repeats the process from step S31 after a predetermined period, for example, until the supply of power is stopped.

[0105] In step S31, the control unit 60 determines whether the load applied to the motor 58A is preventing the motor 58A from rotating. If the load applied to the motor 58A is preventing the motor 58A from rotating, the control unit 60 proceeds to step S32. If the load applied to the motor 58A is not preventing the motor 58A from rotating, the control unit 60 ends the process.

[0106] In step S32, the control unit 60 determines whether a predetermined time has elapsed since the motor 58A stopped rotating. The control unit 60 repeats the process of step S32 until the predetermined time has elapsed since the motor 58A stopped rotating. If the predetermined time has elapsed since the motor 58A stopped rotating, the control unit 60 proceeds to step S33. In step S33, the control unit 60 stops the motor 58A and ends the process.

[0107] For example, the drive unit 50 is configured to rotate the crankshaft 14 in the first crankshaft direction by manual driving force. Q times When the crankshaft 14 is rotated in the rotation direction, the manual driving force is transmitted to the drive wheels 16 via the output portion 56 and the transmission member 22. For example, the drive unit 50 is configured such that the crankshaft 14 is rotated in the second crankshaft direction by the manual driving force. Q times When the crankshaft 14 is rotated in the second crank rotation direction, the electric driving force of the electric driving source 58 is transmitted to the drive wheel 16 via the transmission member 22. According to the drive unit 50 of the present disclosure, for example, when the rider wants to brake the human-powered vehicle 10, the rider can brake the human-powered vehicle 10 using the driving force of the electric driving source 58 by rotating the crankshaft 14 in the second crank rotation direction.

[0108] In the human-powered vehicle 10, drive system 40 for a human-powered vehicle, and drive unit 50 for a human-powered vehicle of the present disclosure, a one-way clutch 54 is disposed between the crankshaft 14 and the output section 56, so that, for example, when the rider rotates the crankshaft 14 in the second crank rotation direction to brake the human-powered vehicle 10, the load on the rider can be reduced.

[0109] <Example of change> The descriptions of the embodiments are merely examples of possible forms that a human-powered vehicle, a drive system for a human-powered vehicle, and a drive unit for a human-powered vehicle according to the present disclosure may take, and are not intended to limit the forms that may be taken. The human-powered vehicle, a drive system for a human-powered vehicle, and a drive unit for a human-powered vehicle according to the present disclosure may take the form of, for example, modified examples of the embodiments shown below, or a combination of at least two mutually consistent modified examples. In the following modified examples, parts that are common to the embodiment are designated by the same reference numerals as the embodiment, and descriptions thereof will be omitted.

[0110] 9 and 10, the human-powered vehicle 10 may further include a third rotating body 36 connected to the transmission member 22. For example, if the human-powered vehicle 10 includes the third rotating body 36, the driving force of the motor 58A is configured to be transmitted from the third rotating body 36 to the transmission member 22, rather than to the output unit 56. For example, the third rotating body 36 has a fifth central axis of rotation C5. For example, if the human-powered vehicle 10 includes the third rotating body 36 and the transmission member 22 includes a chain, the third rotating body 36 is a sprocket around which the chain is wound. For example, if the human-powered vehicle 10 includes the third rotating body 36 and the transmission member 22 includes a chain, the chain is driven by the rotation of the third rotating body 36.

[0111] The switching unit 66 may be omitted from the electric drive source 58. When the switching unit 66 is omitted from the electric drive source 58, for example, the driving force of the motor 58A is always transmitted to the transmission member 22.

[0112] The reducer 68 may be omitted from the electric drive source 58. When the reducer 68 is omitted from the electric drive source 58, the switching unit 66 is provided, for example, between the rotor of the motor 58A and the motor output shaft 58B, or between the motor output shaft 58B and the output unit 56.

[0113] The phrase "at least one" as used herein means "one or more" of the desired options. As an example, the phrase "at least one" as used herein means "only one option" or "both of two options" when the number of options is two. As another example, the phrase "at least one" as used herein means "only one option" or "any combination of two or more options" when the number of options is three or more. [Explanation of symbols]

[0114] 10...human-powered vehicle, 14...crankshaft, 16...driving wheel, 22...transmission member, 40...drive system, 42...coaster brake, 50...drive unit, 52...crankshaft mounting portion, 54...one-way clutch, 56...output portion, 58...electric drive source, 58A...motor, 60...control portion, 66...switching portion, 66A...electromagnetic clutch, 68...reduction gear.

Claims

1. A drive unit for a human-powered vehicle, a crankshaft mounting portion configured to mount a crankshaft; a one-way clutch connected to the crankshaft; an output section that is connected to the crankshaft via the one-way clutch and is connected to a drive wheel of the human-powered vehicle via a transmission member; an electric drive source including a motor configured to transmit a motor drive force of the motor to the transmission member; a control unit that controls the electric drive source, the one-way clutch is configured so that, when the crankshaft rotates in a first crank rotation direction, the crankshaft and the output portion rotate integrally so that the transmission member rotates in a first transmission member rotation direction, and is configured so that, when the crankshaft rotates in a second crank rotation direction opposite to the first crank rotation direction, the crankshaft and the output portion are allowed to rotate relative to each other; The control unit the electric drive source is controlled so that, when the crankshaft rotates in the first crank rotation direction, the transmission member rotates in the first transmission member rotation direction, and, when the crankshaft rotates in the second crank rotation direction, the transmission member rotates in a second transmission member rotation direction opposite to the first transmission member rotation direction, a drive unit configured to control the motor so that, when the crankshaft rotates in the second crank rotation direction, the motor rotates by a larger amount as the crankshaft rotates by a larger amount.

2. A drive unit for a human-powered vehicle, a crankshaft mounting portion configured to mount a crankshaft; a one-way clutch connected to the crankshaft; an output section that is connected to the crankshaft via the one-way clutch and is connected to a drive wheel of the human-powered vehicle via a transmission member; an electric drive source including a motor configured to transmit a motor drive force of the motor to the transmission member; a control unit that controls the electric drive source, the one-way clutch is configured so that, when the crankshaft rotates in a first crank rotation direction, the crankshaft and the output portion rotate integrally so that the transmission member rotates in a first transmission member rotation direction, and is configured so that, when the crankshaft rotates in a second crank rotation direction opposite to the first crank rotation direction, the crankshaft and the output portion are allowed to rotate relative to each other; The control unit the electric drive source is controlled so that, when the crankshaft rotates in the first crank rotation direction, the transmission member rotates in the first transmission member rotation direction, and, when the crankshaft rotates in the second crank rotation direction, the transmission member rotates in a second transmission member rotation direction opposite to the first transmission member rotation direction, a drive unit configured to control the motor so that, when the crankshaft rotates in the second crank rotation direction and the transmission member is rotated in the second transmission member rotation direction by the electric drive source, the electric drive source applies a driving force to the transmission member in the second transmission member rotation direction until the crankshaft rotates in the first crank rotation direction.

3. The drive unit according to claim 2 , wherein the control unit is configured to control the motor in accordance with an amount of rotation of the crankshaft when the crankshaft rotates in the second crank rotation direction.

4. The drive unit according to claim 1 , wherein the electric drive source is configured to transmit the motor drive force to the transmission member via the output portion.

5. The drive unit according to claim 1 , wherein the output portion is configured to be connected to the transmission member via a sprocket, a pulley, or a bevel gear.

6. the electric drive source further includes a switching unit provided between the motor and the output unit and configured to switch a connection state between a first connection state and a second connection state; The switching unit is When the connection state is the first connection state, the motor driving force can be transmitted between the motor and the output unit, When the connection state is the second connection state, the motor driving force cannot be transmitted between the motor and the output unit, 4. The drive unit of claim 1, wherein the control unit is configured to determine whether the connection state of the switching unit is the first connection state when the crankshaft rotates in the second crank rotation direction, and if the connection state of the switching unit is not the first connection state, control the switching unit so that the connection state of the switching unit becomes the first connection state, and if the connection state of the switching unit is the first connection state, control the switching unit so that the first connection state is maintained.

7. 7. The drive unit according to claim 6, wherein the control unit is configured to determine whether the connection state of the switching unit is the first connection state when the crankshaft rotates in the first crank rotation direction and the electric drive source applies propulsive force to the human-powered vehicle, and if the connection state of the switching unit is not the first connection state, control the switching unit so that the connection state of the switching unit becomes the first connection state, and if the connection state of the switching unit is the first connection state, control the switching unit so that the first connection state is maintained.

8. 8. The drive unit according to claim 6, wherein the control unit is configured to determine whether the connection state of the switching unit is the second connection state in at least one of the following cases: when the crankshaft rotates in the first crank rotation direction and a vehicle speed of the human-powered vehicle is equal to or less than a first vehicle speed; when the crankshaft rotates in the first crank rotation direction and a vehicle speed of the human-powered vehicle is equal to or greater than a second vehicle speed that is greater than the first vehicle speed; when the crankshaft rotates in the first crank rotation direction and a rotational speed of the crankshaft is equal to or less than the first rotational speed; when the crankshaft rotates in the first crank rotation direction and a human-powered driving force input to the crankshaft is equal to or less than a first human-powered driving force; and when the motor is stopped; to control the switching unit so that the connection state of the switching unit is set to the second connection state if the connection state of the switching unit is not the second connection state; and to control the switching unit so that the second connection state is maintained if the connection state of the switching unit is set to the second connection state.

9. The drive unit according to claim 6 , wherein the switching unit includes an electromagnetic clutch.

10. the electric drive source further includes a reducer; The drive unit according to claim 6 , wherein the switching unit is provided in the reducer.

11. 11. The drive unit according to claim 1, wherein the control unit is configured to control the motor so that a drive torque of the motor is maintained equal to or less than a first drive torque when the crankshaft rotates in the second crank rotation direction.

12. 12. The drive unit of claim 1, wherein the control unit is configured to stop the motor after a predetermined time has elapsed since the motor stopped rotating if the motor does not rotate due to a load applied to the motor.

13. 13. A drive unit according to claim 1, wherein the output section is arranged coaxially with the crankshaft.

14. A drive system for a human-powered vehicle, comprising: A drive unit according to any one of claims 1 to 13; A drive system comprising: a coaster brake provided on the drive wheel.

15. A drive system for a human-powered vehicle, comprising: a drive unit for the human-powered vehicle; a coaster brake provided on a driving wheel of the human-powered vehicle, The drive unit is a crankshaft mounting portion configured to mount a crankshaft; a one-way clutch connected to the crankshaft; an output section that is connected to the crankshaft via the one-way clutch and is connected to the drive wheels via a transmission member; an electric drive source including a motor configured to transmit a motor drive force of the motor to the transmission member; a control unit that controls the electric drive source, the one-way clutch is configured so that, when the crankshaft rotates in a first crank rotation direction, the crankshaft and the output portion rotate integrally so that the transmission member rotates in a first transmission member rotation direction, and is configured so that, when the crankshaft rotates in a second crank rotation direction opposite to the first crank rotation direction, the crankshaft and the output portion are allowed to rotate relative to each other; The control unit is configured to control the electric drive source so that, when the crankshaft rotates in the first crank rotation direction, the transmission member rotates in the first transmission member rotation direction, and, when the crankshaft rotates in the second crank rotation direction, the transmission member rotates in a second transmission member rotation direction opposite to the first transmission member rotation direction.

16. A human-powered vehicle, A human-powered vehicle comprising a drive system according to claim 14 or 15.

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