Invention Grant
US07644646B1 Three position servo system to control the displacement of a hydraulic motor 有权
三位伺服系统控制液压马达的排量

Three position servo system to control the displacement of a hydraulic motor
Abstract:
A three position servo system. The servo system has a servo housing that has first and second control ports disposed therein in a cavity in fluid communication with the first and second control ports. A servo piston having at least one pressure chamber disposed therein is then used to communicate the pressure within the first and second ports into the first end of the cavity. Thus, when pressure is applied below a threshold pressure to both ports a first position is achieved, when pressure is applied above the threshold pressure in only one port a second position is achieved, and when pressure is applied above the threshold pressure in both ports a third position is achieved. Therefore, the servo system provides three different operating positions.
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