초록 ▼

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

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.

대표청구항 ▼

An emergency control system for use in a reversibly operable vehicle having a hydraulically operated steering system, including reservoir means for a supply of operating fluid for said steering system and a first pump adapted to be operated by the vehicle prime mover for supplying the steering syste

An emergency control system for use in a reversibly operable vehicle having a hydraulically operated steering system, including reservoir means for a supply of operating fluid for said steering system and a first pump adapted to be operated by the vehicle prime mover for supplying the steering system with operating fluid when the prime mover is in operation, said emergency control system comprising; a second pump adapted to be reversibly operated according to the direction of operation of the vehicle, first and second chambers at opposite sides of said second pump serving alternately as suction and discharge chambers according to the direction of operation of said second pump, valve means for interconnecting said reservoir with said chambers comprising first and second passageways for supply of fluid from said reservoir means to said first and second chambers respectively, a valve member in each of said passageways, said valve members each being movable between a position in which flow from the reservoir to its chamber is blocked and a position in which flow is permitted, control means responsive to operation of said first pump for holding said valve members in the flow blocking position so that no operating fluid is delivered to the second pump when the first pump is operating, said control means being operative to open the valve member blocking flow to the chamber serving as suction chamber when the first pump is not in operation and the vehicle is in motion whereby operating fluid is delivered by said second pump to said steering system when the first pump is not operating.