| 摘要 |
A drive unit for use with an electric vehicle comprising a planetary gear arrangement. The planetary arrangement includes a reduction portion and a differential portion and provides a large reduction of rotational speed between the motor and the differential portion while delivering differentiated power to the drive wheels. The planetary arrangement includes, in its preferred embodiment, a first ring gear grounded to the transmission housing, a first pinion carrier having a first set of pinions, a first sun gear formed on an input shaft, a second carrier mated with a first output shaft, the second carrier having a second set of pinions, a compound ring-sun gear operatively situated between the first and second sets of pinions, and a second sun gear formed on a second output shaft, the second sun gear being operatively mated with the second set of pinions. In the preferred embodiment the first set of pinions comprises two types of pinions of different diameters and different lengths alternating arranged on the first carrier ring. The first type of pinion is relatively wide and short and the second type of pinion is relatively narrow and long. An alternate embodiment of the planetary arrangement of the present invention is provided.
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