A multi-stage transmission having more stages using planetary gear sets and employing a forced return means for achieving smooth shifting in a forward operation by acceleration manipulation and a reverse operation by deceleration manipulation is provided. The multi-stage transmission includes a shaft with both ends fixed, a sprocket for receiving a rotational force and a hub shell for outputting the rotational force; a shifting unit comprising one-way clutches and planetary gear sets, each of planetary gear sets being composed of a sun gear, planetary gears, a carrier and a ring gear provided within the hub shell to change the rotational force input through the sprocket and to output the changed rotational force to the hub shell; and a control unit for controlling shifting by controlling pawls provided on the shaft according to manipulation of a shift lever to selectively restrict rotation of the sun gear.
Multi-stage transmission
2015-11-10
Patent
Electronic Resource
English