发明名称 |
HYDRAULIC MOTOR |
摘要 |
<p>PURPOSE: To prevent the abnormally high pressure in a motor casing when a motor is driven in the condition where the drain line is not connected and the pressure in the motor casing becomes high by providing a relief valve on the drain line in a hydraulic motor having the drain line. CONSTITUTION: A hydraulic circuit 1 of a pile driver switches the driving of hydraulic motors 2-4 by switch valves 6-8 interposed between the respective hydraulic motors 2-4 and a hydraulic pump 5. These hydraulic motors 2-4 are separably connected to the switch valve 6 and a drain line 9a to a tank 9. Relief valves 2g-4g are provided in the middle of the drain lines 2c-4c of the hydraulic motors 2-4. When the respective hydraulic motors 2-4 are driven without connection to the drain lines 2c-4c and the pressure in a motor casing is increased, the relief valves 2g-4g are opened to reduce the pressure and prevent the abnormally high pressure in the motor casing.</p> |
申请公布号 |
JPH08105375(A) |
申请公布日期 |
1996.04.23 |
申请号 |
JP19940242936 |
申请日期 |
1994.10.06 |
申请人 |
NIPPON SHARYO SEIZO KAISHA LTD |
发明人 |
NAGATA MITSUO;MATSUZAWA NOBUHIRO |
分类号 |
E02F9/22;F03C1/00;F03C1/26;F03C2/00;F15B11/00;F15B11/028;(IPC1-7):F03C1/00 |
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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