Abstract: A bicycle driving assistance device includes a crank having two pedals and a first chainwheel unit is connected to the crank and a gear box which has its input shaft connected to a first chainwheel unit. A one-direction bearing is connected to the input shaft so as to rotate in the direction to store energy. A vortex spring is connected between the input shaft and the case to which a first gear of the gear box is connected. An output shaft of the gear box outputs the energy to the rear chainwheel unit via the second chainwheel unit to move the rear wheel of the bicycle. The rear chainwheel unit and the crank are separated by a one-direction bearing. When the force applied to the pedals is less than the energy stored in the vortex spring, the energy is released to assist the rider to move the bicycle.

Abstract: A bicycle driving assistance device includes a crank having two pedals and a first chainwheel unit is connected to the crank and a gear box which has its input shaft connected to a first chainwheel unit. A one-direction bearing is connected to the input shaft so as to rotate in the direction to store energy. A vortex spring is connected between the input shaft and the case to which a first gear of the gear box is connected. An output shaft of the gear box outputs the energy to the rear chainwheel unit via the second chainwheel unit to move the rear wheel of the bicycle. The rear chainwheel unit and the crank are separated by a one-direction bearing. When the force applied to the pedals is less than the energy stored in the vortex spring, the energy is released to assist the rider to move the bicycle.

Abstract: A spring-based mechanism for saving labor of a bicycle rider is disclosed and in one embodiment includes an axle operatively connected to a chain wheel and a first set of bearings via a gear assembly; a housing for mounting a shaft therein wherein the first set of bearings is provided at one end of the shaft; a second set of bearings provided at the other end of the shaft; a spring in the housing and having one end attached to one end of the shaft and the other end attached to the other end of the housing; and a clutch provided externally of the other end of the housing, the clutch being operatively connected to the second set of bearings and including a lock lever. The mechanism can store elastic force by counterclockwise pedaling and release the stored energy by disengaging a clutch from the mechanism when riding uphill.

Abstract: A spring-based mechanism for saving labor of a bicycle rider is disclosed and in one embodiment includes an axle operatively connected to a chain wheel and a first set of bearings via a gear assembly; a housing for mounting a shaft therein wherein the first set of bearings is provided at one end of the shaft; a second set of bearings provided at the other end of the shaft; a spring in the housing and having one end attached to one end of the shaft and the other end attached to the other end of the housing; and a clutch provided externally of the other end of the housing, the clutch being operatively connected to the second set of bearings and including a lock lever. The mechanism can store elastic force by counterclockwise pedaling and release the stored energy by disengaging a clutch from the mechanism when riding uphill.

Abstract: A spring-based mechanism for saving labor of a bicycle rider is disclosed and in one embodiment includes an axle operatively connected to a chain wheel and a first set of bearings via a gear assembly; a housing for mounting a shaft therein wherein the first set of bearings is provided at one end of the shaft; a second set of bearings provided at the other end of the shaft; a spring in the housing and having one end attached to one end of the shaft and the other end attached to the other end of the housing; and a clutch provided externally of the other end of the housing, the clutch being operatively connected to the second set of bearings and including a lock lever. The mechanism can store elastic force by counterclockwise pedaling and release the stored energy by disengaging a clutch from the mechanism when riding uphill.