| 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 an electric motor/generator (35 see fig 2) which can also drive the rear wheels through an epicyclic reduction gear (39 see fig 4), a pinion shaft (32 see fig 4) having a bevel pinion 31 and a crown wheel and differential. The motor/generator (35) has a rotor (36 see fig 4) fast with a sun gear (37 see fig 4), meshing with planet gears (38 see fig 4) which are each rotatable on a carrier (41 see fig 4). The planet gears (38) also mesh with a ring gear (43 see fig 4). A ratio change clutch (44 see fig 4) has a low ratio position where the ring gear (43) is grounded to the casing (23 see fig 4) and a high ratio position where the ring gear (43) is connected to the pinion shaft (32), thereby providing a reduction ratio and a direct drive. A control clutch 33 controls the connection from the propshaft 19 to the pinion shaft (32) while a disconnect clutch (42 see fig 4) controls the connection from the motor/generator (35) to the pinion shaft (32).
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