F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
138/41.1
F16D 31/02 (2006.01) F16H 61/46 (2006.01)
Patent
CA 1105358
CONTROL CIRCUIT FOR VARIABLE DISPLACEMENT PUMP WITH VENTURI BYPASS CONTROL Abstract of the Disclosure A control circuit (10) for the variable displacement pump (18) of a hydrostatic transmission (16) or the like comprises an underspeed actuator (31) connected to the servo system (19) of the pump (18), a venturi (15) interconnected between a source of pressurized working fluid (11) and the pump (18) and a pressure regulating valve (36) interconnected between a downstream side of the venturi (15) and the pump (18). A throat (29) and upstream side of the venturi (15) are connected to the underspeed actuator (31) for communicating a differential fluid pressure signal thereto to automatically control the displacement of the the pump (18) under certain operating conditions of an engine of a vehicle. This invention is directed to a bypass arrangement (39) interconnected between a downstream side of the pressure regulating valve (36) and the upstream side of the venturi (15) to closely control the fluid pressure drop across the venturi (15) and to compensate for changes in the temperature of the pressurized working fluid passing through the venturi (15).
335686
Caterpillar Tractor Co.
Smart & Biggar
LandOfFree
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