| 摘要 |
A drive train for coupling the engine to the wheels of a vehicle has a compact combination of planetary gearing, transfer gearing and fluid pressure controlled clutches and brakes which may be conditioned to realize any of a plurality of operational modes to accommodate to different driving conditions. The available operational modes include ordinary two wheel drive, two wheel overdrive, a conventional four wheel drive action wherein power tends to be equally divided between front and rear axles, and an alternate four wheel drive mode wherein a predetermined division of torque is established between the front and rear axles together with a differential action therebetween. In a preferred form, the drive system may also be conditioned for parking by locking front and rear axles against rotation.
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