| 摘要 |
An hydraulic drive system for driving a plurality of wheels of a vehicle. The drive system comprises an hydraulic fluid source, at least two motors for driving the vehicle wheels, a pump connected between the fluid source and the motors for drawing hydraulic fluid from the source and forcing the fluid to the motors, at least two flow restrictions, and at least two load-reaction compensators. Each of the motors drives at least one of the wheels at varying speeds in response to varying rates of fluid flow supplied to the motor from the fluid source. Each of the flow restrictions is positioned between the pump and at least one of the motors. Each restriction varies the rate of fluid flow to at least one of the motors in response to changes in fluid pressure upstream from the restriction. Each of the compensators is connected between the pump and at least one of the restrictions. Each compensator controls pressures upstream from at least one of the restrictions to thereby control the speed of the respective wheel. Each compensator maintains a first generally constant fluid pressure upstream from the respective restriction when fluid pressure downstream from the compensator is below a first predetermined value, and maintains a second generally constant fluid pressure upstream from the respective restriction when the downstream fluid pressure is above a second predetermined value. |
