(JP8295282-A)      Then auxiliary power device comprises a hollow shaft (70) supported on a hanger lug (1) of the bicycle (B) in such a manner that it freely rotates on it but is restricted in movement along a rotational centre line and having end portions projecting outwardly of the hanger lug. A rear wheel driving output gear (17) is releasably mounted on one of the end portions and an input gear (5) is fixed to the other end of it. A crank shaft (80) is supported in a central hole (71) of the hollow shaft in such a manner that it freely rotates in it but is restricted in movement along a rotational centre line of the hollow shaft and has end portions projecting outwardly of the hollow shaft, with a pair of crank arms (81,82) each having a pedal being releasably mounted on the end portions.    Auxiliary power units (50,30,40) releasably mounted on the body of the bicycle, include the electric motor (40) and the rotational force transmitting mechanism (50) for transmitting the rotational force from the electric motor (40) to the input gear. The one-way clutch allows the rotational force transmitting mechanism to transmit a rotational force from the electric motor to the input gear only in the advancing direction of the bicycle. A rotational force controlling unit (T) is interposed between the crank shaft and hollow shaft outside the hanger lugs not only for transmitting a rotational force of the crank shaft to the hollow shaft but also for causing the electric motor to generate a rotational force when the rotational force of the crank shaft exceeds a predetermined value.    (US5909781-A)      Then auxiliary power device comprises a hollow shaft (70) supported on a hanger lug (1) of the bicycle (B) in such a manner that it freely rotates on it but is restricted in movement along a rotational centre line and having end portions projecting outwardly of the hanger lug. A rear wheel driving output gear (17) is releasably mounted on one of the end portions and an input gear (5) is fixed to the other end of it. A crank shaft (80) is supported in a central hole (71) of the hollow shaft in such a manner that it freely rotates in it but is restricted in movement along a rotational centre line of the hollow shaft and has end portions projecting outwardly of the hollow shaft, with a pair of crank arms (81,82) each having a pedal being releasably mounted on the end portions.    Auxiliary power units (50,30,40) releasably mounted on the body of the bicycle, include the electric motor (40) and the rotational force transmitting mechanism (50) for transmitting the rotational force from the electric motor (40) to the input gear. The one-way clutch allows the rotational force transmitting mechanism to transmit a rotational force from the electric motor to the input gear only in the advancing direction of the bicycle. A rotational force controlling unit (T) is interposed between the crank shaft and hollow shaft outside the hanger lugs not only for transmitting a rotational force of the crank shaft to the hollow shaft but also for causing the electric motor to generate a rotational force when the rotational force of the crank shaft exceeds a predetermined value.    (EP763462-B1)      Then auxiliary power device comprises a hollow shaft (70) supported on a hanger lug (1) of the bicycle (B) in such a manner that it freely rotates on it but is restricted in movement along a rotational centre line and having end portions projecting outwardly of the hanger lug. A rear wheel driving output gear (17) is releasably mounted on one of the end portions and an input gear (5) is fixed to the other end of it. A crank shaft (80) is supported in a central hole (71) of the hollow shaft in such a manner that it freely rotates in it but is restricted in movement along a rotational centre line of the hollow shaft and has end portions projecting outwardly of the hollow shaft, with a pair of crank arms (81,82) each having a pedal being releasably mounted on the end portions.    Auxiliary power units (50,30,40) releasably mounted on the body of the bicycle, include the electric motor (40) and the rotational force transmitting mechanism (50) for transmitting the rotational force from the electric motor (40) to the input gear. The one-way clutch allows the rotational force transmitting mechanism to transmit a rotational force from the electric motor to the input gear only in the advancing direction of the bicycle. A rotational force controlling unit (T) is interposed between the crank shaft and hollow shaft outside the hanger lugs not only for transmitting a rotational force of the crank shaft to the hollow shaft but also for causing the electric motor to generate a rotational force when the rotational force of the crank shaft exceeds a predetermined value.    (CN1152280-A)      Then auxiliary power device comprises a hollow shaft (70) supported on a hanger lug (1) of the bicycle (B) in such a manner that it freely rotates on it but is restricted in movement along a rotational centre line and having end portions projecting outwardly of the hanger lug. A rear wheel driving output gear (17) is releasably mounted on one of the end portions and an input gear (5) is fixed to the other end of it. A crank shaft (80) is supported in a central hole (71) of the hollow shaft in such a manner that it freely rotates in it but is restricted in movement along a rotational centre line of the hollow shaft and has end portions projecting outwardly of the hollow shaft, with a pair of crank arms (81,82) each having a pedal being releasably mounted on the end portions.    Auxiliary power units (50,30,40) releasably mounted on the body of the bicycle, include the electric motor (40) and the rotational force transmitting mechanism (50) for transmitting the rotational force from the electric motor (40) to the input gear. The one-way clutch allows the rotational force transmitting mechanism to transmit a rotational force from the electric motor to the input gear only in the advancing direction of the bicycle. A rotational force controlling unit (T) is interposed between the crank shaft and hollow shaft outside the hanger lugs not only for transmitting a rotational force of the crank shaft to the hollow shaft but also for causing the electric motor to generate a rotational force when the rotational force of the crank shaft exceeds a predetermined value.