F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 23/06 (2006.01) F04B 49/00 (2006.01) F04B 49/08 (2006.01)
Patent
CA 2099666
2099666 9314317 PCTABS00024 In the present fluid system (10), a variable pressure inlet system (38) is provided and operational to control the operating pressure level of a charge pump (18) in response to various operating parameters of the fluid system (10). The charge pump (18) provides pressurized fluid to an inlet (34) of a hydraulic pump (16) to insure filling of the pumping chambers therein. By having the operating pressure level of a variable pressure relief valve (68) that is connected to the charge pump (18) controlled between a minimum pressure level and a maximum pressure level responsive to various operating perimeters of the system, the degree of horsepower needed to drive the charge pump (18) is controlled. The operating pressure level of the variable pressure relief valve (68) may be controlled in response to movement of a swash plate (62) of the hydraulic pump (16), the speed of the input drive mechanism (20) to the hydraulic pump (16), the movement of the spool (110) of the control valve (24), or by the operating pressure level representative of a load L or by any combinations thereof acting in parallel one with the other.
Caterpillar Inc.
Smart & Biggar
LandOfFree
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