发明名称 |
HYDRAULIC CONTROL VALVE FOR CONSTRUCTION MACHINERY |
摘要 |
Provided is a hydraulic control valve in which a center bypass passage is not blocked, but is unloaded when a swing and an arm are operated at the same time to prevent the pressure in a hydraulic pump from being increased. The hydraulic control valve includes: a hydraulic pump connected to an engine; a swing spool disposed upstream of a center bypass passage communicating with a discharge passage of the hydraulic pump to control the operation and stopping of a swing motor and directional switching of the swing motor when switched; an arm spool disposed downstream of the bypass passage to control the operation and stopping of an arm cylinder and directional switching of the arm cylinder when switched; and a center bypass control valve disposed within the arm spool, the center bypass control valve being switched by a discharge flow pressure of the hydraulic pump which is increased when a multi operation for simultaneously operating the swing and the arm is performed, and unloading the increased swing side pressure to the center bypass passage when switched. |
申请公布号 |
WO2013002429(A1) |
申请公布日期 |
2013.01.03 |
申请号 |
WO2011KR04659 |
申请日期 |
2011.06.27 |
申请人 |
VOLVO CONSTRUCTION EQUIPMENT AB;KIM, JIN-WOOK |
发明人 |
KIM, JIN-WOOK |
分类号 |
F15B13/043;E02F9/22;F15B11/028 |
主分类号 |
F15B13/043 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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