Circuit for controlling discharge amount of hydraulic pump

Details Circuit for controlling discharge amount of hydraulic pump Circuit for controlling discharge amount of hydraulic pump

2005-12-20

2005-12-20

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S450000

Reexamination Certificate

active

06976358

ABSTRACT:
A circuit for controlling a discharge amount of a hydraulic pump to an actuator irrespective of a load pressure of the actuator even when an engine operates at a low speed has a variable displacement hydraulic pump connected with the engine; an actuator connected with the hydraulic pump; a center-bypass directional switching valve in a flow path between the hydraulic pump and the actuator for controlling start, stop and directional switching of the actuator during a switching operation; a pilot signal generating means in a down stream side of the center bypass for controlling the discharge amount of the hydraulic pump; and a discharge amount adjusting valve in a supply path of the actuator of the directional switching valve for controlling a discharge amount of hydraulic fluid to the actuator.

REFERENCES:
patent: 4420937 (1983-12-01), Naruse et al.
patent: 5758499 (1998-06-01), Sugiyama et al.
patent: 5791142 (1998-08-01), Layne et al.
patent: 5806312 (1998-09-01), Kauss et al.
patent: 5907951 (1999-06-01), Toyooka et al.
patent: 5941155 (1999-08-01), Arai et al.
patent: 5943202 (1984-03-01), None
patent: 7317706 (1995-12-01), None
English Abstract of JP 5943202 Dated Mar. 10, 1984.
English Abstract of JP 7317706 Dated Dec. 8, 1995.

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