发明名称 |
Electrically operated hydraulic actuator with force feedback position sensing |
摘要 |
A proportional hydraulic valve has a primary control spool with a force feedback actuator attached to one end, wherein the control spool meters flow of fluid to a work port. The force feedback actuator includes a piston coupled to the control spool and defining a first control chamber and a second control chamber on opposite sides of the piston. The surface of the piston has a depression with a first tapered section and a second tapered section. The force feedback actuator includes first electrohydraulic valve with a valve element that meters pressurized fluid selectively to the first and second control chambers to move the piston in opposite directions and produce motion of the control spool. A solenoid exerts a first force that on the valve element. A pilot pin engages the piston and the valve element, whereby, movement of the pilot pin on the first and second tapered sections of the piston applies a second force to the valve element. The second force corresponds to the position of the control spool and closes the valve element when the control spool is at a desired location corresponding to magnitude of the first force.
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申请公布号 |
US6637461(B2) |
申请公布日期 |
2003.10.28 |
申请号 |
US20020094744 |
申请日期 |
2002.03.08 |
申请人 |
HUSCO INTERNATIONAL, INC. |
发明人 |
POST TIMOTHY A. |
分类号 |
F15B9/08;F15B13/043;F15B13/16;(IPC1-7):F15B13/043 |
主分类号 |
F15B9/08 |
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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