Hydraulic controller for working machine

Details Hydraulic controller for working machine Hydraulic controller for working machine

2007-01-02

2007-01-02

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

Reexamination Certificate

active

10842460

ABSTRACT:
A hydraulic controller for working machine according to the present invention, which presupposes an electronic control system where an integrated bleed-off valve common to hydraulic actuators is used for bleed-off control and the bleed-off valve is controlled by the secondary pressure of a proportional solenoid valve controlled by a controller, is constituted to compensate supply of a pressure oil for the hydraulic actuators even if the secondary pressure of the proportional solenoid valve is stopped, by providing, at the bleed-off valve, a fail-safe position with a fail-safe path which opens with an opening having smaller area than an unload opening.

REFERENCES:
patent: 5159813 (1992-11-01), Yoshimatsu et al.
patent: 5394697 (1995-03-01), Hirata
patent: 2002/0112475 (2002-08-01), Cannestra
patent: 2004/0244232 (2004-12-01), Toji
patent: 2005/0204736 (2005-09-01), Toji et al.
patent: 0 582 859 (1994-02-01), None
patent: 0 597 109 (1994-05-01), None
patent: 11-303809 (1999-11-01), None

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