| 摘要 |
A variable speed transmission includes parallel driver and driven shafts (54, 56) which mount respective series of intermeshing gears (60-65, 70-75) of progressively increasing gear ratio for selectively transmitting power from one shaft to the other. A series of two-way roller clutches are interposed between the driven shaft (56) and respective gear members (70-75) of the series of driven gears. The roller clutches are engageable for rotatively coupling the driven gears (70-75) to the driven shaft (56) and are disengageable for permitting relative rotation between the driven gears and the driven shaft. Each of the roller clutches includes a cam disk (10) having a plurality of recesses (20) formed in its peripheral surface and a roller retainer (12) circumferentially supporting a plurality of rollers (32) within respective recesses (20) in the cam disk. A hydraulically controlled actuator is operatively connected to each of the retainers (12) for indexing the roller retainers (12) together with the plurality of rollers (32) between respective limit positions within the recesses. The actuating means includes an annular plate (22, 24) rotatively coupled to the roller retainer and angularly spaced vanes (44) in communication with a pair of fluid supply ducts (92, 94 and 96, 98) of a stationary hydraulic housing (80-85). One of the supply ducts (92, 94) provides for indexing the roller retainer (12) to one of the limit positions, and the other of the supply ducts (96, 98) provides for indexing the roller retainer (12) to the other limit position.
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