Power plants – Pressure fluid source and motor – Having a signal – indicator or inspection means
Patent
1982-08-25
1984-10-16
Cohen, Irwin C.
Power plants
Pressure fluid source and motor
Having a signal, indicator or inspection means
60404, 60405, 60413, 91 5, 180133, B62D 508, F15B 2000
Patent
active
044766777
ABSTRACT:
An hydraulic supply circuit for a vehicle power steering system of the type having a steering actuator and control valve therefor with hydraulic input, sump and overflow (by-pass) connections and in which any fluid not actually consumed by the actuator is diverted to the overflow connection. A positive displacement pump is provided having an output line connected to the input connection of the steering system. An accumulator having a charging line and a discharging line is used to supply fluid pressure in lieu of the pump. To control flow of fluid to and from the accumulator a charge-discharge valve is provided having charge and discharge modes. In the charge mode the accumulator is charged by the overflow and in the discharge mode pressure fluid is supplied from the accumulator to the input connection for maintaining the steering system in operation while blocking the overflow. A flow sensing device in the output line of the pump is used to maintain the charge-discharge valve in its charge mode as long as fluid is pumped at normal rate by the pump but causing the charge-discharge valve to switch to its discharge mode upon any interruption of flow. A pressure switch is coupled to the accumulator discharge line for sounding an alarm to the vehicle operator whenever the pressure in the line drops thereby to signal that the steering system is receiving fluid from the accumulator on an emergency basis.
REFERENCES:
patent: 3905438 (1975-09-01), Runyon et al.
patent: 3913324 (1975-10-01), Miller et al.
patent: 4085587 (1978-04-01), Garlinghouse
patent: 4217968 (1980-08-01), Dezelan
patent: 4243115 (1981-01-01), Wall et al.
patent: 4326558 (1982-04-01), Gage
Cohen Irwin C.
Dresser Industries Inc.
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