The invention is a double motor power unit, suitably for being mounted onto a bicycle frame, which is fitted with at least two motors (7), at least one power supply (13), bearings (8), crank shaft pinion gearhead (11), at least one propulsor pinion gearhead (10) for each motor, at least one planetary gearbox (15) for each motor, and at least one central processor unit (12). It is characterized in that the propulsor pinion gearheads (10) are connected to pinions with dynamometric system (19), having an at least approximately identical axis, and to planetary gearboxes (15) through the pinions, while the inside of the bearings (8) is in fixed connection with the crank shaft (9) and the outside of the bearing (8) is in fixed connection with the crank shaft pinion gearhead (11). The invention is also the procedure for placing the power unit according to claim suitably into a bicycle frame.

A hub motor is disclosed, the hub motor is mounted on an axle assembly, the an axle assembly includes an axle rod and an axle sleeve, and an independent cassette flywheel is provided at one end of the axle sleeve where an end cover is located, a limiting sleeve is disposed outside of the cassette flywheel to prevent the cassette flywheel from detaching from the axle sleeve, and an anti-rotation piece for preventing rotation of the axle sleeve is provided at another end of the axle sleeve where a wheel hub is located.

A hub motor is disclosed, the hub motor is mounted on an axle assembly, the an axle assembly includes an axle rod and an axle sleeve, and an independent cassette flywheel is provided at one end of the axle sleeve where an end cover is located, a limiting sleeve is disposed outside of the cassette flywheel to prevent the cassette flywheel from detaching from the axle sleeve, and an anti-rotation piece for preventing rotation of the axle sleeve is provided at another end of the axle sleeve where a wheel hub is located.

A pedally propelled vehicle drive train includes a housing, a crankshaft, an internal multi-speed gear with co-axial input and output shafts, and an electric motor with an output shaft. The crankshaft, the input and output shafts of the internal multi-speed gear and the output shaft of the electric motor are all arranged in parallel.

A pedally propelled vehicle drive train includes a housing, a crankshaft, an internal multi-speed gear with co-axial input and output shafts, and an electric motor with an output shaft. The crankshaft, the input and output shafts of the internal multi-speed gear and the output shaft of the electric motor are all arranged in parallel.

A clutch or brake system for a torque transmission. The clutch or brake system includes a first rotatable unit connectable to an input or output, including at least one first abutment surface and a second rotatable unit connectable to an output or input, respectively, including at least one second abutment surface arranged for selectively engaging the first abutment surface. The first and second abutment surfaces are adapted to each other so as to allow disengaging under load. The system includes a third rotatable unit including at least one retaining member, the third unit being arranged for selectively being in a first rotational position or a second rotational position relative to the second rotatable unit, wherein the at least one retaining member in the first rotational position locks the at least one second abutment surface for rotationally coupling the second rotatable unit to the first rotatable unit.

A clutch or brake system for a torque transmission. The clutch or brake system includes a first rotatable unit connectable to an input or output, including at least one first abutment surface and a second rotatable unit connectable to an output or input, respectively, including at least one second abutment surface arranged for selectively engaging the first abutment surface. The first and second abutment surfaces are adapted to each other so as to allow disengaging under load. The system includes a third rotatable unit including at least one retaining member, the third unit being arranged for selectively being in a first rotational position or a second rotational position relative to the second rotatable unit, wherein the at least one retaining member in the first rotational position locks the at least one second abutment surface for rotationally coupling the second rotatable unit to the first rotatable unit.

A coasting clutch and a gear system with a coasting clutch include mutually facing first and second clutch members. The coasting clutch is arranged to operate in an engaged position, wherein the first and second clutch members are axially in mesh and rotating with the same speed, or overrunning and rotating with different speeds. The coasting clutch includes a coasting mechanism arranged to operate the coasting clutch into a coasting position when the clutch is overrunning. In the coasting position, the first and second clutch members are axially arranged further from each other than in the engaged position.

A coasting clutch and a gear system with a coasting clutch include mutually facing first and second clutch members. The coasting clutch is arranged to operate in an engaged position, wherein the first and second clutch members are axially in mesh and rotating with the same speed, or overrunning and rotating with different speeds. The coasting clutch includes a coasting mechanism arranged to operate the coasting clutch into a coasting position when the clutch is overrunning. In the coasting position, the first and second clutch members are axially arranged further from each other than in the engaged position.

A transmission for a bicycle includes at least four shift elements, one input shaft (1), a first planetary gear set (PS1) which is operatively connected to the input shaft (1), and a second planetary gear set (PS2). A carrier of the first planetary gear set is rotationally fixed to a carrier of the second planetary gear set (PS2).