| 摘要 |
PROBLEM TO BE SOLVED: To prevent a lubrication failure from occurring in a differential gear even in any state happening, in this starting assist device which is equipped with an electric motor and this differential gear having those of first, second and third rotational elements, connecting this motor to the first rotational element via a reduction gear train and simultaneously connecting a driven wheel to the second rotational element, and in time of starting a vehicle, braking the third rotation element by a braking means, and then making an output torque in the motor so as to be transmitted to the driven wheel via the reduction gear train and the differential gear. SOLUTION: A first lubricating oil passage 191 feeding each lubricating spot of two differential gears 9L and 9R with oil raked up by rotation of a gear 10f of a reduction gear train and a second lubricating oil passage 192 feeding the lubricating spot with oil raked up by rotation of a third rotational element 9b both are installed in a gear case 18 housing the reduction gear train and both these differential gears 9L and 9R. In time of starting, oil is supplied via the lubricating oil passage 191 and thereby the differential gears are lubricated, and after the starting, the oil is supplied by a braking release of the rotational element 9b via the lubricating oil passage 192 and thus the differential gears are lubricated. |
