| 摘要 |
A transmission comprises: an input shaft intended to be coupled to a motor; an output shaft; an epicyclic reduction unit with an input sun wheel, a ring and first and second output shafts respectively fast and slow; a first clutch for connecting the input sun wheel to the ring gear of the said reduction unit; an hydraulic variator unit coupled between the input shaft of the transmission and this input sun wheel; second and third clutches operable to connect the input shaft of the transmission with the ring gear of the epicyclic reduction gear unit to give respective transmission ratios of opposite sign, respectively for forward and reverse gears. The arrangement is such that when the output speed of the variator varies over a predetermined range on either side of zero, and the first clutch is disengaged and the second or third clutch is engaged, the first and the second output shaft of the epicyclic reduction unit have respective speeds which vary over respective ranges of contiguous values. Auxiliary clutches make it possible to achieve coupling of the output shaft of the transmission selectively to the first or the second output shaft of the epicyclic reduction unit with predetermined speed ratios. (FIG. 1)
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