Hydraulic control device for controlling a boom-swing frame...

Details Hydraulic control device for controlling a boom-swing frame... Hydraulic control device for controlling a boom-swing frame...

2007-10-02

2007-10-02

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

C060S430000, C091S448000

Reexamination Certificate

active

11315420

ABSTRACT:
A hydraulic control device includes first and second pumps, a swing control spool, a boom first-speed control spool, a boom second-speed control spool, a swing motor, a boom cylinder, a pilot control valve, and a confluence line for merging the hydraulic flow from the boom second-speed control spool with that from the boom first-speed control spool. Provided on the confluence line is a swing priority valve having an orifice for variably reducing the hydraulic flow supplied to the boom cylinder through the confluence line. A swing priority control line is provided to interconnect a pressure receiving part of the swing priority valve and a swing control pilot pressure signal line of the pilot control valve in such a manner that an aperture area of the variable orifice of the swing priority valve is reduced in proportion to the magnitude of a swing control pilot pressure of the pilot control valve.

REFERENCES:
patent: 5673558 (1997-10-01), Sugiyama et al.
patent: 5692377 (1997-12-01), Moriya et al.
patent: 5930996 (1999-08-01), Nakamura et al.
patent: 5970709 (1999-10-01), Tohji

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