发明名称 |
Hydraulic control device for controlling a boom-arm combined operation in an excavator |
摘要 |
A hydraulic control device for controlling a boom-arm combined operation in an excavator includes a boom low-speed control spool and an arm high-speed control spool provided on parallel lines for receiving hydraulic flow from a second hydraulic pump via the parallel lines. A boom priority valve is provided on the parallel line interconnecting the second hydraulic pump and the arm high-speed control spool for throttling the parallel line to cause the hydraulic flow of the pump to be supplied to the boom low-speed control spool prior to the arm high-speed control spool. The boom priority valve has a pressure receiving part remaining in fluid communication with a boom pilot valve through a boom priority control signal line and a variable orifice section for reducing an opening area of the parallel line in proportion to the magnitude of a boom priority control signal pressure delivered to the pressure receiving part.
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申请公布号 |
US2006156714(A1) |
申请公布日期 |
2006.07.20 |
申请号 |
US20050302704 |
申请日期 |
2005.12.13 |
申请人 |
DOOSAN INFRACORE CO., LTD. |
发明人 |
KIM YONG C. |
分类号 |
F16D31/02 |
主分类号 |
F16D31/02 |
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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