An auxiliary power device adapted for use with a bicycle includes a drive unit, first and second one-way transmissions that are adapted to be mounted in a bike frame of the bicycle, a crankshaft and a transmission sprocket. The first one-way transmission is connected between the drive unit and the transmission sprocket. The second one-way transmission is mounted between the crankshaft and the transmission sprocket. When rotation of the transmission sprocket is driven by the drive unit via the first one-way transmission, the second one-way transmission is idling. When rotation of the transmission sprocket is driven by the crankshaft via the second one-way transmission, the first one-way transmission is idling.

An auxiliary power device adapted for use with a bicycle includes a drive unit, first and second one-way transmissions that are adapted to be mounted in a bike frame of the bicycle, a crankshaft and a transmission sprocket. The first one-way transmission is connected between the drive unit and the transmission sprocket. The second one-way transmission is mounted between the crankshaft and the transmission sprocket. When rotation of the transmission sprocket is driven by the drive unit via the first one-way transmission, the second one-way transmission is idling. When rotation of the transmission sprocket is driven by the crankshaft via the second one-way transmission, the first one-way transmission is idling.

A coupling arrangement for coupling members as a gear change coupling in a gear mechanism unit includes a first member and a second member. The first member has a coupling toothing system. At least one locking body arrangement is mounted pivotably on the second member. The locking body arrangement can be pivoted into a coupling position, in the case of which a driving section on the locking body arrangement engages into the coupling toothing system. The locking body arrangement can be pivoted into a release position, in the case of which the driving section of the locking body arrangement does not engage into the coupling toothing system. The locking body arrangement has a locking body carrier which is mounted pivotably on the second member, and has a locking body member which is mounted pivotably on the locking body carrier and on which the driving section is configured.

A coupling arrangement for coupling members as a gear change coupling in a gear mechanism unit includes a first member and a second member. The first member has a coupling toothing system. At least one locking body arrangement is mounted pivotably on the second member. The locking body arrangement can be pivoted into a coupling position, in the case of which a driving section on the locking body arrangement engages into the coupling toothing system. The locking body arrangement can be pivoted into a release position, in the case of which the driving section of the locking body arrangement does not engage into the coupling toothing system. The locking body arrangement has a locking body carrier which is mounted pivotably on the second member, and has a locking body member which is mounted pivotably on the locking body carrier and on which the driving section is configured.

A cycle is described in which an electric motor is coupled to a chainring or pedal sprocket via one or more chains or belts. The electric motor is also coupled to a sprocket of the rear wheel of the cycle. A clutch mechanism is further included between the linkage coupling the chainwheel and the electric motor such that either the electric motor, the pedals, or simultaneously both can drive the cycle. This design further allows the electric motor to be removed and the cycle to be pedaled normally.

A cycle is described in which an electric motor is coupled to a chainring or pedal sprocket via one or more chains or belts. The electric motor is also coupled to a sprocket of the rear wheel of the cycle. A clutch mechanism is further included between the linkage coupling the chainwheel and the electric motor such that either the electric motor, the pedals, or simultaneously both can drive the cycle. This design further allows the electric motor to be removed and the cycle to be pedaled normally.

Provided is a shifting device for shifting of a bicycle gear, such as a hub gear, of a bicycle. The shifting device includes a main control unit and preferably a motor control unit. The device includes a shifting control unit for receiving shifting instructions from the main control unit or the motor control unit. The shifting control unit includes a processing unit and a memory, power receiving means, such as including an electrical connector, for receiving power from a battery of the main control unit and/or a drive motor battery of the bicycle, a shifting motor, such as an electric motor, such as a stepper motor for providing a shifting motion for driving a shifting assembly for actuating a gear actuator, the shifting assembly for transferring the shifting motion from the shifting motor to the gear actuator, and the gear actuator for transferring the shifting motion to the bicycle gear. The shifting control unit, by means of communication with and controlling by the main control unit of the bicycle, is configured as a subsystem of the bicycle. The shifting control unit shifts the bicycle gear at each time on the basis of shifting instructions from the main control unit or the motor control unit.

The power transmission mechanism includes a non-contact power transmission mechanism and a mechanical power transmission mechanism, both of which are provided in parallel on a power unit side or a rear wheel side. The mechanical power transmission mechanism has a crown gear and a pinion that are meshed at the time of low-speed rotation of the engine and are separated at the time of medium-high speed rotation thereof.

The power transmission mechanism includes a non-contact power transmission mechanism and a mechanical power transmission mechanism, both of which are provided in parallel on a power unit side or a rear wheel side. The mechanical power transmission mechanism has a crown gear and a pinion that are meshed at the time of low-speed rotation of the engine and are separated at the time of medium-high speed rotation thereof.

An electric bicycle includes: a sleeve to which power for driving the electric bicycle is input; a rear wheel; and a power transmission mechanism that transmits the power input to the sleeve to the rear wheel. The electric bicycle determines an abnormality of the power transmission mechanism or prevents or prohibits driving performed by using the power transmission mechanism based on a reference composite gear ratio of the power transmission mechanism acquired at a first time and current composite gear ratio of the power transmission mechanism acquired at a second time subsequent to the first time.