发明名称 |
Hydraulic door operating system |
摘要 |
A hydraulic system for opening and/or closing the rear lift gate of a vehicle uses a double or single acting gas charged hydraulic cylinder. If double acting, a second piston separates the head side of the cylinder into hydraulic and gas chambers. A unidirectional (for the single acting cylinder) or a bidirectional (for the double acting cylinder) drives a pump to operate the cylinder. A solenoid actuated on-off valve selectively communicates the ports of the cylinder with tank pressure. A gas charge accumulator may also be provided. In the double acting embodiment, a two way ball shuttle valve which is vented in the center provides alternating communication between the two cylinder ports.
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申请公布号 |
US5921604(A) |
申请公布日期 |
1999.07.13 |
申请号 |
US19970856715 |
申请日期 |
1997.05.15 |
申请人 |
APPLIED POWER INC. |
发明人 |
YU, XUDONG;GRIESBACH, ERIC N.;BLOTZ, DOUGLAS C. |
分类号 |
B60C29/06;F15B15/14;(IPC1-7):B62D25/00 |
主分类号 |
B60C29/06 |
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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