Motors: expansible chamber type – With motive fluid valve
Patent
1979-02-22
1980-11-11
McCarthy, Edward J.
Motors: expansible chamber type
With motive fluid valve
13762569, F15B 1108
Patent
active
042325846
ABSTRACT:
The invention provides a control valve having a valve piston and coacting valve sleeve for flow control in booster power steering systems of the kind having a servo steering pump and a metering pump, especially as used in motor vehicles having power steering cylinders. The valve piston and valve sleeve have novel rings and grooves that effect a throttling flow control as the valve piston is shifted in steering, which substantially reduces vibration or chatter of the valve, permits ready return to neutral of the valve piston and the danger of cavitation in the power cylinder precluded. The dimensioning of special rings on the piston coacting with rings in the valve sleeve produces the advantages of the invention particularly when the valve is controlling high pressures. The arrangement effects a throttling of pressure flow from the metering pump to the power cylinder such that, when the valve piston is shifted for steering, low throttling is at first effected followed by high throttling as the valve piston moves to its fully shifted position, corresponding to initial low pressure in a power cylinder reaching high pressure in the course of power piston travel, as pressure flow is metered from the manually operated metering pump to the control valve.
REFERENCES:
patent: 2963316 (1961-01-01), Schultz
patent: 3119235 (1964-01-01), Lewis
patent: 3176721 (1965-04-01), Gordon
patent: 3273468 (1966-09-01), Allen
patent: 3312246 (1967-04-01), Tam
patent: 3581771 (1971-06-01), Garrison
patent: 3587235 (1971-06-01), Goff
McCarthy Edward J.
Zahnradfabrik Friedrichshafen AG
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