Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1988-06-29
1990-07-03
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
91517, 91518, 91531, 13759614, F16H 3944
Patent
active
049380222
ABSTRACT:
In a hydraulic drive system, first and second flow control valves means comprise each: a main valve having a valve body for controlling communication between an inlet port and an outlet port both connected to a main circuit, a variable restrictor capable of changing an opening degree thereof in response to displacements of the valve body, and a back pressure chamber communicating with the outlet port through the variable restrictor and producing a control pressure to urge the valve body in the valve-opening direction; a pilot valve connected to a pilot circuit which is connected between the inlet port of and the back pressure chamber of the main valve; and an auxiliary valve connected to the pilot circuit for controlling a differential pressure between the inlet pressure and the outlet pressure of the pilot valve. The auxiliary valve is controlled such that the differential pressure between the inlet and outlet pressures of the pilot valve has a relationship expressed by a certain equation including predetermined constants .alpha., .beta. and .gamma., with respect to a differential pressure between the delivery pressure of a hydraulic pump and the maximum load pressure of first and second hydraulic actuators, a differential pressure between that maximum load pressure and the self-load pressure of each of the hydraulic actuators, and the self-load pressure, respectively.
REFERENCES:
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patent: 4425759 (1984-01-01), Krusche
patent: 4535809 (1985-08-01), Andersson
patent: 4617854 (1986-10-01), Kropp
patent: 4712376 (1987-12-01), Hadank et al.
Hirata Toichi
Nozawa Yusaku
Garrett Robert E.
Hitachi Construction Machinery Co. Ltd.
Kapsalas George
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