发明名称 |
Pump displacement control for a variable displacement pump |
摘要 |
A pump displacement control for a variable displacement pump includes a torque control valve disposed between a variable torque limiter and a force applying device disposed in axial alignment within a common bore. A sleeve and a valve spool are movable relative to each other to establish a first condition communicating discharge pressure into an actuator chamber to move a swashplate toward a minimum displacement position against the bias of a spring or a second condition communicating the actuating chamber with an exhaust passage to allow the spring to move the swashplate toward its maximum displacement position. A torque control piston disposed between opposing springs resiliently bias the valve spool in a direction to establish the second condition when control fluid is directed into a control chamber. Pump discharge pressure communicated into a pressure chamber exerts a force against the valve spool proportional to the discharge pressure so that the valve spool moves in a second direction to establish the first condition when the control force exceeds the biasing force exerted by the torque limiter.
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申请公布号 |
US5567123(A) |
申请公布日期 |
1996.10.22 |
申请号 |
US19950526830 |
申请日期 |
1995.09.12 |
申请人 |
CATERPILLAR INC. |
发明人 |
CHILDRESS, DALE B.;MANRING, NOAH D. |
分类号 |
F04B49/00;F04B13/00;F04B49/08;F16K31/124;(IPC1-7):F04B49/08 |
主分类号 |
F04B49/00 |
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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