| 摘要 |
An emergency hydraulic system for a hydraulically powered device such as the power steering mechanism used on large earth-moving vehicles and the like is disclosed. The emergency system includes an auxiliary pump connected to the wheels or some other part of the vehicle so that the pump is operated despite engine failure whenever the vehicle is in motion. An inlet valve for the pump is held in the closed position whenever the vehicle prime mover is in operation so that the pump is deprived of operating fluid when an emergency condition does not exist. If the prime mover stops running so that the main hydraulic system is not operating and the power steering system is deprived of its source of power, the inlet to the emergency pump is opened so that the pump supplies operating fluid to the steering system so long as the vehicle is in motion. Since the pump is deprived of operating fluid when an emergency does not exist very little power is consumed.
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