Hydraulic controller

Details Hydraulic controller Hydraulic controller

2005-01-25

2005-01-25

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

C060S422000, C060S426000

Reexamination Certificate

active

06845702

ABSTRACT:
The present invention intends to improve a hydraulic control unit and prevent the occurrence of hunting as well as to reduce the size of the hydraulic control unit.The hydraulic control unit is used in a several-directional-control-valves-assembled-type hydraulic control system 1 having a load sensing function. The hydraulic control unit has a PLS port. The PLS port is supplied with a maximum load pressure in the hydraulic control system. The compensator of the hydraulic control unit includes a metering orifice imparted with a function equivalent to a check valve. The compensator is imparted with the function of a shuttle valve (directional control valve), and by allowing the shuttle valve to operate independently of the compensator the pressure PLS is adjusted constantly.

REFERENCES:
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patent: 5890362 (1999-04-01), Wilke
patent: 6334308 (2002-01-01), Sato et al.
patent: 6584770 (2003-07-01), Tsuruga et al.
patent: 6782697 (2004-08-01), Mather
patent: 0 536 398 (1996-07-01), None
patent: 0 516 864 (2001-12-01), None
patent: 04-194468 (1992-07-01), None
patent: 07-139506 (1995-05-01), None
Translation of the International Search Report for PCT/JP01/08284 from The International Bureau of WIPO dated May 12, 2003.
International Search Report for PCT/JP01/08284 from the Japanese Patent Office dated Dec. 4, 2001.

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