发明名称 |
Load sensing pump control for a variable displacement pump |
摘要 |
A variable displacement pump has a discharge passage and a displacement controller disposed to decrease pump displacement in response to an increasing pressure signal and to increase pump displacement in response to a decreasing pressure signal. A load sensing pump control for the pump includes a displacement control valve having an input port connected to the discharge passage and a signal port connected to the displacement controller. A valve spool controls communication between the input and signal ports and is biased in a direction to block the inlet port from the signal port by a spring. The spool has a differential area for exerting a force against the spool in opposition to the spring force proportional to the pump discharge pressure entering the valve through the input port. A variable force can be selectively exerted against the spool in opposition to the spring force to change the displacement of the pump.
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申请公布号 |
US5876185(A) |
申请公布日期 |
1999.03.02 |
申请号 |
US19960752507 |
申请日期 |
1996.11.20 |
申请人 |
CATERPILLAR INC. |
发明人 |
SCHIMPF, JAMES E.;MARCOTT, TONY L. |
分类号 |
F04B49/08;(IPC1-7):F04B49/08 |
主分类号 |
F04B49/08 |
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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