A motor unit includes a case, a motor, an input shaft, an input body, an output body, and a speed reducer mechanism. The input shaft penetrates through the case in an axial direction and is arranged to be rotatable. The input body is disposed along an outer peripheral surface of the input shaft and rotates along with the input shaft. The output body is arranged along the outer peripheral surface of the input shaft to be rotatable and receives rotational force from the input body. The case includes a first bearing, a second bearing, and a third bearing. The first bearing is located at one end in an axial direction and supports a rotary shaft unit including the input shaft, the input body, and the output body. The second bearing is located at the other end in the axial direction and supports the rotary shaft unit. The third bearing is located between the first bearing and the second bearing in the axial direction and supports at least one of the input body or the output body.

A human-powered vehicle includes a crank axle, a first rotational body, a wheel, a second rotational body, a transmission body that transmits a driving force between the first rotational body and the second rotational body, a derailleur configured to operate the transmission body to change a transmission ratio, and a motor configured to drive the transmission body. A control device has an electronic controller configured to control the motor and drive the transmission body with the motor so as to change at least one of a rotational angle of the motor and an output torque of the motor in correspondence with a state of the human-powered vehicle upon determining the derailleur has been actuated to change the transmission ratio and a predetermined condition related to pedaling is satisfied.

Various powered mobility systems, such as scooters and wheeled boards, are disclosed. The powered mobility system can be a drive assembly, which can include a motor, transmission assembly, driving wheel, and power supply. The drive assembly can be detachable from the rest of the personal mobility vehicle.

A motor is to be mounted on a vehicle as a drive source. The motor includes a motor shaft extending in an axial direction, a drive gear provided on the motor shaft, a gear shaft extending in the axial direction, a driven gear provided on the gear shaft and coupled to the drive gear, a rotating member, an inner bearing that supports the gear shaft, and an outer bearing that supports the gear shaft. The rotating member is provided on the gear shaft and is configured to be coupled to a power transmission member that transmits power to a wheel of the vehicle. The rotating member is located between the inner bearing and the outer bearing in the axial direction.

A bicycle transmission using a variable speed motor and a planetary gear mechanism includes: a first input rotary shaft (10) rotatably connected to a main power source (11); a second input rotary shaft (20) receiving a motor rotational power from a variable speed motor (21); a planetary gear mechanism (30) receiving first and second rotational power respectively from the first input rotary shaft (10) and the second input rotary shaft (20), wherein the planetary gear mechanism (30) includes a ring gear (33), a carrier (31), a plurality of planet gears (32), and a sun gear (34); an output shaft (40) receiving a third rotational power from the planetary gear mechanism (30); and a control unit (50) controlling the variable speed motor (21) and controlling a rotational direction and speed of the second input rotary shaft (20).

A bicycle transmission using a variable speed motor and a planetary gear mechanism includes: a first input rotary shaft (10) rotatably connected to a main power source (11); a second input rotary shaft (20) receiving a motor rotational power from a variable speed motor (21); a planetary gear mechanism (30) receiving first and second rotational power respectively from the first input rotary shaft (10) and the second input rotary shaft (20), wherein the planetary gear mechanism (30) includes a ring gear (33), a carrier (31), a plurality of planet gears (32), and a sun gear (34); an output shaft (40) receiving a third rotational power from the planetary gear mechanism (30); and a control unit (50) controlling the variable speed motor (21) and controlling a rotational direction and speed of the second input rotary shaft (20).

A centrally-mounted drive mechanism used for a power-assisted bicycle, and a power-assisted bicycle. The centrally-mounted drive mechanism comprises an outer casing (1), an electric motor (2), a planetary gear mechanism in a transmission connection with an output shaft of the electric motor (2), a bevel gear driving end (9), and a bevel gear driven end (10) that meshes with the bevel gear driving end (9), said bevel gear driven end (10) being connected to a crankset (13). The planetary gear mechanism comprises a planetary gear (4) and a planetary gear output bracket (5), and a bevel gear support base (8) that is sleeved on the outer part of the planetary gear output bracket (5). A clutch (6) is disposed between the planetary gear output bracket (5) and the bevel gear support base (8), and a transmission connection is formed by means of the clutch (6) between the planetary gear output bracket (5) and the bevel gear support base (8). The bevel gear driving end (9) and the bevel gear support base (8) are coaxially and fixedly connected, and a support assembly (7) is mounted on the outer part of the bevel gear support base (8), said support assembly (7) being used to support the planetary gear output bracket (5) and the bevel gear driving end (9). The axial length of the centrally mounted drive mechanism is relatively short, and thus the overall structure and volume are more compact, thus making it convenient to install a battery with a greater capacity on the power-assisted bicycle, and increasing endurance capacity.

A centrally-mounted drive mechanism used for a power-assisted bicycle, and a power-assisted bicycle. The centrally-mounted drive mechanism comprises an outer casing (1), an electric motor (2), a planetary gear mechanism in a transmission connection with an output shaft of the electric motor (2), a bevel gear driving end (9), and a bevel gear driven end (10) that meshes with the bevel gear driving end (9), said bevel gear driven end (10) being connected to a crankset (13). The planetary gear mechanism comprises a planetary gear (4) and a planetary gear output bracket (5), and a bevel gear support base (8) that is sleeved on the outer part of the planetary gear output bracket (5). A clutch (6) is disposed between the planetary gear output bracket (5) and the bevel gear support base (8), and a transmission connection is formed by means of the clutch (6) between the planetary gear output bracket (5) and the bevel gear support base (8). The bevel gear driving end (9) and the bevel gear support base (8) are coaxially and fixedly connected, and a support assembly (7) is mounted on the outer part of the bevel gear support base (8), said support assembly (7) being used to support the planetary gear output bracket (5) and the bevel gear driving end (9). The axial length of the centrally mounted drive mechanism is relatively short, and thus the overall structure and volume are more compact, thus making it convenient to install a battery with a greater capacity on the power-assisted bicycle, and increasing endurance capacity.

To allow a wide range of existing bicycles to be easily converted into electric power assisted bicycles, a retrofit electric machine for a bicycle includes: a housing (52) configured to be attached to a frame (18) of a bicycle (10), an electric motor (54) attached to the housing (52); an annular rotating plate (84) mounted on the housing (52) in a rotatable manner to be centered around a rotational center line of a crankshaft (24) for a pedal of the bicycle (10), and connected to the electric motor (54) in a torque transmitting relationship; and a connecting member (90) including a first connecting portion (92) connected to the crankshaft (24) with a shape fit so as to rotate integrally with the crankshaft (24), and a connecting pin (98) secured to the rotating plate (84).

A cardan joint steering titanium alloy hand and foot cooperatively operated bicycle capable of being ridden with one leg comprises a bicycle front wheel, a front wheel fork frame, a bicycle rear wheel, a frame body, a seat cushion assembly, a steering handlebar, paired chain wheels and a rear wheel fork frame. The upper end of a front fork rotating shaft and the lower end of an assisting stem are connected through a cardan joint component, symmetric ratchet wheels are provided on the two sides of the bicycle rear wheel, the paired chain wheels are fixed to the two sides of a frame middle shaft, pedal shaft pins are symmetrically provided on the outer sides of the paired chain wheels, and the paired chain wheels and the symmetric ratchet wheels are connected through symmetric chains.