Patent ID: 7055403

Claim:
A clutch assembly comprising: a driving assembly having an input axle; at least one driving gear mounted on and driven by the input axle; a transmission assembly connected to the driving assembly and having (a) an output axle having an axis and a central hole axially defined through the output axle, (b) at least one driven gear rotatably mounted on the output axle and engaging with the at least one driving gear, (c) an inner axle slidably mourned in the central hole in the output axle and engaged with the output axle to rotate with the output axle, and (d) a unidirectional transmitting device mounted in the output axle and between the at least one driven gear and the inner axle to make the inner axle being driven by the at least one driven gear rotate in a unidirectional manner and to provide a clutching effect when the inner axle slides relative to the output axle; and, two linear bearings mounted in the central hole respectively at two ends of the output axle for two ends of the inner axle penetrating respectively through the linear bearings, the inner axle having an outer surface and multiple channels defined in the outer surface, each linear bearing having multiple rollers axially mounted in the hole and received in the channels in the inner axle to abut with the inner axle.