发明名称 |
Hydraulic circuit for boom cylinder combination having float function |
摘要 |
The present invention relates to a hydraulic circuit for a boom cylinder combination having a float function which is capable of implementing a leveling work in such a manner that a leveling work is performed by lowering a boom based on its self-weight without using an operation oil discharged from a hydraulic pump using an excavator during a leveling work which includes a first inner path which is formed in one side of the boom cylinder combining spool and connects a hydraulic pump and a boom cylinder large chamber in a switching mode, a second inner path which is formed in the other side of the boom cylinder combining spool and connects an operation oil from the hydraulic pump to a hydraulic tank in a switching mode, and a third inner path which is formed in the other side of the boom cylinder combining spool and combines the operation oils from the small chamber and large chamber of the boom cylinder in a switching mode and connects the same to the hydraulic tank.
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申请公布号 |
US6892535(B2) |
申请公布日期 |
2005.05.17 |
申请号 |
US20030442337 |
申请日期 |
2003.05.21 |
申请人 |
VOLVO CONSTRUCTION EQUIPMENT HOLDING SWEDEN AB |
发明人 |
KIM JIN WOOK |
分类号 |
E02F9/22;F15B11/02;F15B11/024;F15B11/08;F15B11/17;F15B13/02;F15B13/04;(IPC1-7):F16D31/02 |
主分类号 |
E02F9/22 |
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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