F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/79.16
F15B 11/08 (2006.01) F15B 13/01 (2006.01)
Patent
CA 1131544
OVERRUNNING LOAD CONTROL FOR HYDRAULIC MOTORS ABSTRACT OF THE DISCLOSURE A hydraulic system including a hydraulic motor having a port adapted to be connected to a reservoir and a hydraulic fluid pump. A normally closed check valve connects the port to the reservoir and includes two, hydraulically opposed, differential surfaces, one being smaller than the other and being disposed to be responsive to pressure at the port. In- cluded is a normally closed, pilot-operated, first metering valve having an inlet and an outlet and a second metering valve also having an inlet and an outlet along with a shiftable metering element interposed therebetween. A spring biases the element towards a position minimizing flow between the inlet and the outlet and a pressure responsive surface is disposed on the element in bucking relation to the spring. The first valve inlet is connected to the second valve outlet and to a larger surface of the check valve and the port is connected to the second valve inlet as well as connected to direct pressure to the second valve pressure responsive surface. The first valve outlet is connected to the reservoir. The first valve controls the degree to which the check valve may open while the second valve provides load compensation in the circuit. - 1 -
324441
Haak Willard J.
Marsden Howard A.
Moots Paul C.
Caterpillar Tractor Co.
Kirby Eades Gale Baker
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