F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
137/98
F15B 11/10 (2006.01) B60K 17/10 (2006.01) F15B 13/04 (2006.01) F16H 61/40 (2006.01)
Patent
CA 1044559
RESPONSIVE PILOT-OPERATED CONTROL VALVE FOR FRONT WHEEL DRIVE Abstract of the Disclosure A pilot-operated, spring-centered, directional con- trol valve includes a valve body having a bore, chambers at opposite ends of the bore, a valve spool slidably dis- posed within the bore, a hollow piston slidably disposed within each of the chambers and biased by springs inwardly toward the spool, and a secondary piston slidably disposed within one of the primary pistons so that pilot pressure directed into the outward ends of the chambers acts on the end of the spool or the end of the secondary piston to selectively operate the valve. The various components of the valve have differing effective cross-sectional areas upon which pilot pressure acts. The control valve is advanta- geously employed in a hydraulic system controlling front wheel drive in a vehicle.
278657
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