Controlled pressure upstaging and flow reduction

Details Controlled pressure upstaging and flow reduction Controlled pressure upstaging and flow reduction

1980-03-04

1982-05-04

Cohen, Irwin C.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60427, 60445, 60468, 60484, 91511, F15B 1116, F15B 1306, F16H 3946

Patent

active

043275494

ABSTRACT:
An improvement is disclosed in a hydraulic system (10) having a variable displacement pump (12) and being capable of delivering pressurized fluid from the pump (12) to selectively engage at least three work circuits (18) with a first (20) of the circuits (18) being normally operable up to a first pressure and a second (22) of the circuits (18) being normally operable up to a second and lower pressure. The improvement comprises circuitry (80, 92, 94, 98, 108, 120, 122, 124, 126) for selectively operating a third (24) of the circuits (18) at one of the first or second pressures or at an upstaged pressure which exceeds the first pressure and circuitry (128) for reducing the displacement of the pump (12) in response to the third circuit (24) being operated at the upstaged pressure. Such upstaged pressure is available in a controlled manner for working against particularly heavy loads. Thus, a third and higher operating level is added to a system which already operates at at least two pressure levels.

REFERENCES:
patent: 3788401 (1974-01-01), Scheidt et al.
patent: 3922855 (1975-12-01), Bridwell
patent: 4020862 (1977-05-01), Bohnlein et al.
patent: 4024797 (1977-05-01), Johnson
patent: 4030623 (1977-06-01), Bridwell et al.
patent: 4107924 (1978-08-01), Dezelan
patent: 4123907 (1978-11-01), Bianchetta et al.

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