公开(公告)号：US4801247A

公开(公告)日：1989-01-31

申请号：US900445

申请日：1986-08-26

申请人： Toshio Hashimoto ,  Susumu Yoshino ,  Akira Ohashi ,  Masao Egi ,  Yasuyuki Shingu ,  Takashi Yoshioka ,  Siro Hattori

发明人： Toshio Hashimoto ,  Susumu Yoshino ,  Akira Ohashi ,  Masao Egi ,  Yasuyuki Shingu ,  Takashi Yoshioka ,  Siro Hattori

IPC分类号： F04B1/32 ,  F04B49/06 ,  F04B1/30

CPC分类号： F04B1/324 ,  F04B49/06 ,  F04B2201/12051

摘要： A variable displacement piston pump of the type in which the hydraulic pressure in a pressure chamber of an output flow variable element is controlled by a proportional electro-hydraulic control valve to control the displacement of the variable element against a spring to vary the output flow within a range between a maximum output flow and a full cut-off and the output pressure or both the output pressure and the output flow of the pump are controlled electro-hydraulically through a closed loop. The variable displacement piston pump includes flow detector for generating an electric signal corresponding to the output flow of the pump, pressure detector for generating an electric signal corresponding to the output flow of the pump, and control amplifier responsive to the difference between a flow setting signal and the output signal of the flow detector to control a driving control current supplied to the proportional electro-hydraulic control valve and also responsive to the detected output pressure reaching a predetermined value to control the driving control signal in accordance with the difference between a pressure setting signal and the output signal of the pressure detector.

摘要翻译： 一种可变容量活塞泵，其中输出流量可变元件的压力室中的液压压力由比例电动液压控制阀控制，以控制可变元件相对于弹簧的位移，以改变其内部的输出流量 在最大输出流量和全截止值之间的范围以及泵的输出压力或输出压力以及输出流量两者之间的范围通过闭环电液压控制。 可变排量活塞泵包括用于产生对应于泵的输出流的电信号的流量检测器，用于产生对应于泵的输出流的电信号的压力检测器，以及响应于流量设定信号 以及流量检测器的输出信号，以控制提供给比例电液控制阀的驱动控制电流，并且还响应于检测到的输出压力达到预定值，以根据压力设定之间的差来控制驱动控制信号 信号和压力检测器的输出信号。