Pressure control device wherein shut-off valves are opened and closed in timed relation with suction and delivery strokes of reciprocating pump device

摘要

A braking pressure control device having a first shut-off valve in a fluid passage connecting master cylinder and vehicle wheel brake cylinder, a second shut-off valve between the first shut-off valve and the brake cylinder, a reciprocatingly pump device having a variable-volume chamber which is connected to a portion of the fluid passage between the first and second shut-off valves and whose volume is changed by reciprocating movement of a pump piston, and a synchronizer for opening and closing the first and second shut-off valves in timed relationship with suction and delivery strokes of the pump piston for suction and delivery of a brake fluid into the variable-volume chamber.