| 摘要 |
A planetary gear mechanism having multiple ratios, at least one of which is an underdrive ratio, including an overdrive unit acting in cooperation with the gearing to provide an overdrive range wherein the overdrive unit is located at the power input side of the gearing where it is adapted to provide a torque delivery path between the torque input elements of the gearing and the power input portions of the mechanism with an infinitely variable speed ratio, the overall speed ratio of the gear system during operation in one limiting ratio in the overdrive range being close to the direct drive ratio of unity.
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