Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...
Patent
1987-11-03
1989-06-06
Garrett, Robert E.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Second path activated in response to pressure or flow in...
91516, 91517, 91532, F15B 1304
Patent
active
048360872
ABSTRACT:
A hydraulic control apparatus for a vehicle capable of being significantly simplified in structure and stabilizing its control characteristics. The apparatus includes a variable constriction provided in a first flow passage arranged between a steering pump and a steering cylinder and a steering spool for changing over the first flow passage and controlling the degree of opening of the variable constriction. The apparatus also includes a single flow control valve spool which changes over depending on a variation of pressure on an upstream side of the variable orifice and accomplishes an increase and a decrease in the degree of opening of a second flow passage arranged between a switch pump and an implement circuit corresponding to an increase and a decrease in pressure on the upstream side of the variable constriction.
REFERENCES:
patent: 4385674 (1983-05-01), Presley
patent: 4453451 (1984-06-01), Streeter et al.
patent: 4553389 (1985-11-01), Tischer
Denion Thomas
Garrett Robert E.
Kayaba Industry Co. Ltd.
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