| 摘要 |
A frictional drive transmission basically comprises a transmission case, a drive roller unit (1), a driven roller unit (2), a gear shifting mechanism and an elastic member (10). Each of the roller units has a plurality of rollers with each of the driven rollers (21,22,23) being associated with a corresponding one of the drive rollers (11,12,13) to form roller pairs. The gear shifting mechanism is operatively coupled to one of the roller units to selectively contact one of the roller pairs together to form a contacting roller pair. A cam-shaped support member (8) is provided with a mounting surface and a cam slanted surface such that contact surfaces thereof forms an angle smaller than forty-five degrees with respect to the mounting surface. The elastic member (10) is arranged between the transmission case and the mounting surface of the cam-shaped support member (8) to apply a pressing force in a contact direction of a contacting roller pair.
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