| 摘要 |
In a motor vehicle having an internal combustion engine driving a front final drive unit connected to a pair of front wheels and a pair of rear wheels 21 driven through the rear final drive unit 18 by a longitudinal propshaft 19, the rear final drive unit 18 houses a transversely arranged electric motor/generator 35. The motor/generator 35 has a hollow rotor 36 which is connected to a spur input gear 64 of a layshaft reduction gear train 65 through a hollow shaft 37. This input gear 64 meshes with a large diameter spur gear 66 fixed on a layshaft 67 which also has a small diameter spur gear 68 fixed on it. The small diameter spur gear 68 meshes with a large diameter driving gear 69 fast with a differential 28 which drives the rear wheels by means of the drive shafts 22, one of which extends concentrically through the rotor 36 and the hollow shaft 37. A control clutch 33 controllably couples the propshaft 19 to an input shaft 32 which drives a final drive bevel pinion 31 which meshes with a crownwheel 27 fast with the large diameter spur gear 66. The layshaft 67 provides a reduction ratio between the motor/generator 35 and the final drive pinion 31 and the differential 28 as well as providing a reduction ratio between the input shaft 32 and the differential 28.
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