| 摘要 |
A transmission system for use in automobile vehicles and in which the ratio-varying unit is unidirectional and is of the continuously-variable type, particularly the toroidal-race rolling traction type. An epicyclic combination and a hydrokinetic element are located in succession between the output of the ratio-varying unit and the final drive output of the system as a whole. The epicyclic combination and hydrokinetic element help to overcome two typical problems of transmissions with such ratio-varying units, namely low output torque range and difficulty in starting from rest, and this arrangement and the torque-splitting action of the epicyclic combination enable a smaller element to be used than would be possible if it were located on the input side of the ratio-varying unit. The system also includes a reversing mechanism located downstream of the ratio unit and preferably between the hydrokinetic element and the final drive output. This mechanism, by including gearing of an appropriate ratio, may also serve to limit the maximum speed of the final drive output in reverse compared with its maximum forward speed.
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