Hydraulic control system for heavy construction equipment

Details Hydraulic control system for heavy construction equipment Hydraulic control system for heavy construction equipment

2006-08-25

2008-12-02

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S422000, C060S447000

Reexamination Certificate

active

07458211

ABSTRACT:
A hydraulic control system is disclosed, which can minimize the flow rate of a hydraulic fluid being discharged from a variable displacement hydraulic pump by using pilot pressure constantly produced by a pilot pump when a switching valve is in a neutral position, and can adjust the flow rate of the hydraulic fluid being discharged from the variable displacement hydraulic pump by using pressure produced by a pressure generator positioned at the most downstream side of a bypass passage if a separate input signal is applied to the pressure generator when the switching valve is operated. The hydraulic control system includes a main variable displacement hydraulic pump, a pilot pump, a plurality of actuators, a switching valve interposed between the main pump and the actuators, a load pressure signal passage for guiding a part of the hydraulic fluid to a tank via the first flow control device, and a flow control device for the main pump installed on one side of the main pump to control the flow rate of the hydraulic fluid by adjusting the inclination angle of a swash plate in the main pump.

REFERENCES:
patent: 4426194 (1984-01-01), Pollman
patent: 5152143 (1992-10-01), Kajita et al.
patent: 5447027 (1995-09-01), Ishikawa et al.
patent: 5873245 (1999-02-01), Kato et al.
patent: 6105367 (2000-08-01), Tsuruga et al.
patent: 2003004001 (2003-01-01), None

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