Abstract: A power-assist system and method for a bicycle, comprising three main sections, namely: a motor section, a speed-reducing section, and a power-assist section. It is capable of operating in four modes, namely: a) a power-assist pedaling mode (where the bicycle rider is pedaling to supply power and the power-assist section is also providing power); b) a pedal only mode (where power is supplied solely by pedaling the bicycle; c) a power-assist only mode (where the bicycle rider is not providing any power by pedaling, and all the power is supplied by the power-output section); and d) a coasting no-power mode where the bicycle is traveling with the pedal section stationary, and no power is being delivered either by the pedal section or the power-assist drive system.

Abstract: A power-assist system and method for a bicycle, comprising three main sections, namely: a motor section, a speed-reducing section, and a power-assist section. It is capable of operating in four modes, namely: a) the power-assist pedaling mode (where the bicycle rider is pedaling to supply power and the power-assist section is also providing power); b) the pedal only mode (where power is supplied solely by pedaling the bicycle; c) the power-assist only mode (where the bicycle rider is not providing any power by pedaling, and all the power is supplied by the power-output section); and d) a coasting no-power mode where the bicycle is traveling with the pedal section stationary, and no power is being delivered either by the pedal section or the power-assist drive system.

Abstract: A power-assist system and method for a bicycle, comprising three main sections, namely: a motor section, a speed-reducing section, and a power-assist section. It is capable of operating in four modes, namely: a) the power-assist pedaling mode (where the bicycle rider is pedaling to supply power and the power-assist section is also providing power); b) the pedal only mode (where power is supplied solely by pedaling the bicycle; c) the power-assist only mode (where the bicycle rider is not providing any power by pedaling, and all the power is supplied by the power-output section); and d) a coasting no-power mode where the bicycle is traveling with the pedal section stationary, and no power is being delivered either by the pedal section or the power-assist drive system.

Abstract: A power-assist system for a bicycle by which the bicycle can be operated in various modes. There is a pedal-alone mode, a power-assist mode, a combined pedaling and power-assist mode, and a coasting mode. An overriding clutch is positioned between the pedal section and the sprocket, and a second overriding clutch is positioned between a speed reducing gear section, driven by a motor, and a power-assist shaft located in the crank housing.

Abstract: A power-assist system for a bicycle by which the bicycle can be operated in various modes. There is a pedal-alone mode, a power-assist mode, a combined pedaling and power-assist mode, and a coasting mode. An overriding clutch is positioned between the pedal section and the sprocket, and a second overriding clutch is positioned between a speed reducing gear section, driven by a motor, and a power-assist shaft located in the crank housing.

Abstract: A gear drive transmission comprising an output shaft extending between front and rear portions of a housing. At the central portion of the shaft, there is a concentrically mounted drive gear section engaging first and second ring gears. A rotational and orbiting movement of the gear drive section causes rotation of a rotatably mounted ring gear to drive the shaft. There is a feedback mechanism positioning and controlling movement of the shaft. The shaft can have a single output end or two output ends.

Abstract: A rotary actuator suitable for a robotic arm or servo drive, which is capable of large loads and large speed reductions is disclosed. The device includes an input shaft that drives an epicyclic transmission integral with the articulation. The transmission is contained in a fixed arm housing and an end housing. An input shaft has eccentrics that rotate two primary external spur gears which are engaged with two primary internal gears. The two primary external gears are fastened on both faces of the external secondary gear. The external primary gears and external secondary gear rotate about the axis of an eccentric, and orbit the input shaft axis. A secondary external gear transmits its rotary motion to an internal secondary gear affixed to an output arm. Large speed reductions are possible due to the differential action of the primary and secondary gears.