公开(公告)号：US4418779A

公开(公告)日：1983-12-06

申请号：US372446

申请日：1982-04-27

申请人： Masafumi Nakayama ,  Tokiyoshi Yanai ,  Masato Fukino

发明人： Masafumi Nakayama ,  Tokiyoshi Yanai ,  Masato Fukino

IPC分类号： B62D5/07 ,  B62D5/06 ,  B62D5/08

CPC分类号： B62D5/06

摘要： A control apparatus for a power-assisted steering system, comprising a power cylinder having pressure acting chambers respectively communicating with the control ports of a pressure control valve having inlet and outlet ports respectively communicable with the delivery and suction ports of a pump, and first and second flow control valves each having an inlet port and a discharge port communicating with the suction port of the pump, each flow control valve including a control pressure acting chamber communicating with a pressure acting chamber of the power cylinder to develop a differential pressure variable with a differential pressure between the pressure acting chambers of the cylinder, and a valve member movable in response to the differential pressure acting thereon and urged to provide communication between the inlet and discharge ports of each flow control valve, the inlet port of the first flow control valve being in constant communication with the delivery port of the pump and the inlet port of the pressure control valve, the inlet port of the second flow control valve being in constant communication with the outlet port of the pressure control valve, the valve member of each flow control valve being operative to block the communication between the inlet and discharge ports of the valve when the differential pressure is higher than a predetermined value, the second flow control valve further comprising a bypass providing constant communication between the outlet port of the pressure control valve and the suction port of the pump independently of the valve member.

摘要翻译： 一种用于动力辅助转向系统的控制装置，包括具有压力作用室的动力缸，所述动力缸分别与具有可与泵的输送和吸入端口连通的入口和出口的压力控制阀的控制端口连通，以及第一和 第二流量控制阀，其具有与泵的吸入口连通的入口和排出口，每个流量控制阀包括与动力缸的压力作用室连通的控制压力作用室，以形成压力变量， 气缸的压力作用室之间的压差和可响应于作用在其上的压差而可移动的阀构件，并被推动以在每个流量控制阀的入口和排出口之间提供连通，第一流量控制阀 与泵的输送口持续通信 压力控制阀的入口，第二流量控制阀的入口与压力控制阀的出口恒定连通，每个流量控制阀的阀构件可操作以阻止入口和 所述第二流量控制阀还包括在所述压力控制阀的所述出口与所述泵的吸入口之间恒定的连通的第二流量控制阀，所述旁路独立于所述阀构件。