Hydraulic control device and industrial vehicle with hydraulic control device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 30, 2007
Grant Date -
Feb 5, 2004
app pub date -
Jun 19, 2003
filing date -
Jun 19, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A main spool is located in a bypass line connecting a pump line to a return line. The main spool moves in an axial direction according to the pressure in a spring chamber and the pressure in a pilot chamber, thereby adjusting the opening degree of the bypass line. A pilot switching valve is located in a pressure control passage connecting the spring chamber to the return line. The pilot switching valve controls the flow rate of hydraulic oil that flows from the spring chamber to the return line in accordance with the load pressure of a hydraulic actuator, thereby adjusting the pressure of hydraulic oil in the spring chamber. As a result, the range of the flow rate of hydraulic oil supplied to the hydraulic actuator, which range precludes the influence of the load pressure of the hydraulic actuator, is expanded.
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