Multiple displacement hydraulic pump system with automatic displ

Details Multiple displacement hydraulic pump system with automatic displ Multiple displacement hydraulic pump system with automatic displ

1985-01-18

1985-10-01

Gluck, Richard E.

Power plants

Pressure fluid source and motor

Pulsator

417287, 417417, 417302, 303 10, F16D 3102, F04B 4908

Patent

active

045437890

ABSTRACT:
A pump system is disclosed for delivering hydraulic fluid to a load device, such as a hydraulic brake system. The system automatically switches from larger displacement to smaller displacement as pressure at the outlet increases. The pump system comprises one or more lower pressure pumps and a high pressure pump with an actuator driving all pumps simultaneously. An unloading valve is coupled with each lower pressure pump for dumping the output thereof in response to pressure of the fluid delivered to the load device. The actuator comprises an electromagnetic linear motor which imparts an intake stroke to the pumps and stresses a spring which releases stored energy for imparting the pressure stroke to the pumps.

REFERENCES:
patent: 2461501 (1949-02-01), Miller
patent: 2688231 (1954-09-01), Northcutt
patent: 3542495 (1970-11-01), Barthalon
patent: 3887238 (1975-06-01), Bennett
patent: 3918847 (1975-11-01), Junck et al.
patent: 4019103 (1977-04-01), Davis et al.
patent: 4122378 (1978-10-01), Brown
patent: 4357798 (1982-11-01), Hung

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