Responsive pilot-operated control valve for front wheel drive

Details Responsive pilot-operated control valve for front wheel drive Responsive pilot-operated control valve for front wheel drive

1976-09-01

1978-07-11

Peters, Jr., Joseph F.

Motor vehicles

Steam traction engines

Spring mounted on axle

13762566, 91433, F16K 1106, B60K 1702

Patent

active

040995887

ABSTRACT:
A pilot-operated, spring-centered, directional control valve includes a valve body having a bore, chambers at opposite ends of the bore, a valve spool slidably disposed 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 advantageously employed in a hydraulic system controlling front wheel drive in a vehicle.

REFERENCES:
patent: 3458005 (1969-07-01), Malm
patent: 3480099 (1969-11-01), Nighswonger
patent: 3481419 (1969-12-01), Kress
patent: 3506081 (1970-04-01), Rumsey
patent: 3557829 (1971-01-01), Finley
patent: 3763746 (1973-10-01), Walters
patent: 3818802 (1974-06-01), Wilson
patent: 3897719 (1975-08-01), Tipton

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