Hydraulic control device for a mobile machine, especially for a wheel loader
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United States of America Patent
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-
Apr 16, 2002
Grant Date -
N/A
app pub date -
Feb 10, 2000
filing date -
Aug 11, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic control arrangement for a mobile working machine has at least one hydraulic cylinder with the aid of which a working tool is moved, a directional control valve for controlling pressure-fluid channels between chambers of the hydraulic cylinder, a pressure-fluid source and a tank, a hydraulic accumulator connected to the pressure-fluid source via a filling line, and a control valve to open and to close a connection between the hydraulic accumulator and a pressure chamber of the hydraulic cylinder. To achieve a damping of pitching movement of the machine, a pilot-operated shutoff valve is connected upstream of the pressure chamber of the hydraulic cylinder, and opens when the directional control valve is actuated to allow pressure fluid to flow off from the pressure chamber to the tank.
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