Fluid handling – Systems – Multi-way valve unit
Patent
1979-02-09
1982-01-05
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
91434, 13759614, 1376256, 192 12C, F15B 1308
Patent
active
043088937
ABSTRACT:
Clutch-brake steering unit having hydraulically actuated cylinders which are adapted for controlling same to control rotation of a track-drive sprocket in a crawler tractor, and which are under control of a clutch-brake steering valve mechanism. A bore in the valve is common to and receives both an independently slidable hydropotentiometer spool precisely providing a master setting pressure, and an independently slidable metering spool providing a single pressure signal always hydraulically matched with the precise master setting pressure. A clutch cylinder and a brake cylinder provided in the unit have an inlet-outlet port in common, and are so arranged on a spring-applied-brake, hydraulically-applied-clutch basis that the generated single pressure signal when applied to the inlet-outlet port alternately operates the cylinders to apply the brake and release the clutch, or to release the brake and apply the clutch, or by proper modulation to partially engage either, i.e., slip the clutch or drag the brake to intermediate degrees as desired.
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Chatterjea Probir K.
Shore Daniel B.
Au Buchon F. David
Gaines John W.
International Harvester Company
Michalsky Gerald A.
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