| 摘要 |
A differential gear (30) includes a rotatable case (32), pinions (34) rotatably disposed in the case (32), a pair of side gears (36) meshing with the pinions (34) and disposed in the case (32), a first shaft (44) supported rotatably about a rotary axis of the case (32) and extending from one of side gears (36), a second shaft (48) supported rotatably about the axis and extending from the other side gear (36) in the opposite direction to the first shaft, a first driven gear (50) provided in one of the first and second shafts (44,48), a first drive gear (98) for rotating the driven gear (50) to transmit driving force to the first and second shafts (44,48). A worm wheel (52) fixed to the case (32), a worm (55) meshing with the worm wheel (52) and an electric motor (56) are provided. The motor (56) is controlled by a control device (106) so as to maintain the difference between numbers of revolutions of the first and second shafts (44,48) within a predetermined range.
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