Load sensing steering system with dual power source

Details Load sensing steering system with dual power source Load sensing steering system with dual power source

F - Mech Eng,Light,Heat,Weapons

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F15B 11/16 (2006.01) F15B 11/17 (2006.01) F15B 13/02 (2006.01)

Patent

CA 1062123

APPLICATION OF: James K. Yip FOR: LOAD SENSING STEERING SYSTEM WITH DUAL POWER SOURCE A B S T R A C T A system for providing pressurized fluid to a primary load circuit and an auxiliary load circuit, the primary load circuit being of the type which provides a load pressure signal repre- sentative of the demand for fluid in the primary load curcuit. The system includes first and second fluid pumps feeding first and second priority flow control valves, respectively, each of which has a primary outlet port connected to the primary load circuit and an auxiliary outlet port connected to the auxiliary load circuit. When the flow demand of the primary load circuit can be satisfied by the first pump, any excess flow available is fed by the first flow control valve to the auxiliary load circuit, and all of the flow from the second pump goes to the auxiliary circuit. If the flow demand of the primary load circuit is greater than the capacity of the first pump, all of its flow passes to the primary load circuit with none going to the auxiliary load circuit, and a novel pilot valve arrangement permits the load pressure signal from the primary load circuit to bias the second flow control valve to a position where a sufficient amount of the flow from the second pump is fed to the primary load cir- cuit to meet the demand thereof, with the remainder of the flow going from the second flow control valve to the auxiliary load circuit.

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