Hydraulic circuit
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United States of America Patent
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-
Oct 5, 2004
Grant Date -
May 15, 2003
app pub date -
Nov 6, 2002
filing date -
Nov 9, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic circuit comprises a first and a second merging line capable of supplying pressure oil from a third pump for a third circuit to directional control valves in a first and a second circuit, respectively, and a merging valve for selectively communicating or cutting off the first and the second merging line with or from the third pump. The merging valve has a first shift position at which the third pump is connected to the second merging line, and a second shift position at which the third pump is connected to the first and the second merging line. The merging valve is shifted continuously between the shift positions. The hydraulic circuit can efficiently distribute pressure oil supplied from the third pump to the first and/or second circuit as well, and can prevent lowering of the operability of each of actuators connected to the first or second circuit.
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