Hydraulic control system for working machine

Details Hydraulic control system for working machine Hydraulic control system for working machine

2007-10-23

2007-10-23

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

Reexamination Certificate

active

11078340

ABSTRACT:
A hydraulic control system for a working machine according to the present invention includes a regulator control valve for controlling an operation of a pump regulator and a controller for sending a control signal for changing a discharge quantity of the pump to the regulator control valve in accordance with an operation amount of an operating device. This system further includes a fail-safe valve disposed in a control line joining the pump regulator and the regulator control valve. The fail-safe valve is configured so as to switch from an ordinary position to a fail-safe position in accordance with a failure signal indicative of failure in the regulator control valve.

REFERENCES:
patent: 4823552 (1989-04-01), Ezell et al.
patent: 58-193906 (1983-11-01), None
patent: 7-133808 (1995-05-01), None
patent: 10-54370 (1998-02-01), None
patent: 11-303809 (1999-11-01), None
patent: 2000-282515 (2000-10-01), None

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