发明名称 |
Hydraulic valve actuated by piezoelectric effect |
摘要 |
A valve-actuator for a hydraulic valve includes a valve chamber, ports spaced mutually and opening into the chamber, a spool axially located in the chamber for opening and closing hydraulic connections between at least two of the ports as the spool moves axially in the chamber. An actuator includes a housing having mutually spaced surfaces, and a piezoelectric element located in the housing between the surfaces, the element expanding and contracting in response to an electric signal applied to the element. A temperature compensation and motion damping circuit comprising feedback resistors and a thermistor. The spool moves axially in the chamber in response to expansion and contraction of the element.
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申请公布号 |
US7717132(B2) |
申请公布日期 |
2010.05.18 |
申请号 |
US20060487661 |
申请日期 |
2006.07.17 |
申请人 |
FORD GLOBAL TECHNOLOGIES, LLC |
发明人 |
BURKHART ROBERT O.;PIETRON GREGORY M.;FUJII YUJI |
分类号 |
F15B13/044;F16K31/02;H02N2/06 |
主分类号 |
F15B13/044 |
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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