HIGH-PRESSURE FUEL FEED PUMP, AND DISCHARGE VALVE UNIT USED THEREIN

摘要

Provided are a high pressure fuel feed pump, which is equipped with a discharge valve capable of reducing the influences of noises due to a flow in a circumferential direction of a valve member, and a discharge valve unit used in the fuel feed pump. The high pressure fuel feed pump comprises a discharge valve (8) acting as a check valve between a pressure chamber (11) and a discharge port (13). The discharge valve (8) includes a valve member housing (8d), a discharge valve spring (8c), a valve member (8b) and a seat member (8a). The discharge valve (8) is a flat valve. When the valve is open, the flow of a fuel having collided against the valve member in the axial direction from the pressure chamber is radially dispersed in the radial direction of the valve member, and becomes a flow directly heading toward the discharge port and a flow in the circumferential direction of the valve member, which collides against the inner wall of the valve member housing and thereafter heads toward the discharge port. The discharge valve (8) is equipped with a liquid damper chamber formed between the outer circumference of the seat member (8a) and the outer circumference of the valve member (8b), and the inner circumference of the valve member housing (8d), for the circumferential flow. The liquid damper chamber is composed of first, second and third tubular passages (503A, 503B and 503C).