Hydraulic system for heavy equipment option apparatus

Details Hydraulic system for heavy equipment option apparatus Hydraulic system for heavy equipment option apparatus

2007-01-02

2007-01-02

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of...

Reexamination Certificate

active

10460321

ABSTRACT:
The present invention is directed to controlling an operation oil supplied to an option apparatus without changing a design of a control valve assembly which controls an operation oil supplied to a traveling motor, etc. when additionally engaging an option apparatus to a small size excavator. In a hydraulic system for a heavy equipment which includes a plurality of hydraulic pumps, a main control valve which is switched by a pilot signal pressure and controls an operation oil supplied to a left and right side traveling motor and a work apparatus, and a pilot pump which supplies a pilot signal pressure to the main control valve, there is provided a hydraulic system for a heavy equipment option apparatus which includes a straight traveling control valve which combines an operation from a plurality of the hydraulic pumps and supplies to the left and right side traveling motors and disconnects an operation supplied to the traveling motor when the same is switched by a pilot signal pressure, and an option apparatus control valve which is switched concurrently with the straight traveling control valve by a pilot signal pressure and controls an operation oil supplied from one side hydraulic pump to an additional option apparatus.

REFERENCES:
patent: 4210061 (1980-07-01), Bianchetta
patent: 5083428 (1992-01-01), Kubomoto et al.
patent: 6148548 (2000-11-01), Tohji
patent: 6330797 (2001-12-01), Kondo
patent: 6430922 (2002-08-01), Tohji
patent: 8199632 (1996-08-01), None
patent: 2002 206256 (2002-07-01), None
English Abstract of JP 2002 206256 dated Jul. 26, 2002.
English Abstract of JP 8199632 dated Aug. 6, 1996.

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