High-pressure fuel supply pump having electromagnetically-driven intake valve

摘要

The present invention eliminates a valve holder and accommodates a valve guide in a small space provided between a valve seat and a peripheral surface part of a pressure chamber to reduce the size of a pump. The valve guide guides a stroke of the valve and is provided inside the valve seat. The valve includes an annular abutting surface that abuts a valve seat formed in a valve housing to shut off a fuel intake passage and a bottomed cylindrical part is provided at an inner peripheral part of the annular abutting surface. The bottomed cylindrical part is inserted into a fuel introduction hole formed in the valve housing inside the valve seat. A member having a cylindrical surface part that supports a reciprocating motion of the valve, is fixed to the valve housing, face-to-face with an inner peripheral part of the bottomed cylindrical part.

主权项

1. A high-pressure fuel supply pump comprising:
a pump housing in which a pressurizing chamber is provided; a piston plunger supported by the pump housing, the piston plunger repetitively performing a reciprocating motion within the pressurizing chamber to suck fluid into the pressurizing chamber, pressurize the fluid therein and discharge the fluid out of the pressurizing chamber; an electromagnetically-driven intake valve unit including an intake valve provided on the side of the pressurizing chamber adjacent to a valve seat provided at a valve housing and a valve biasing spring configured to bias the intake valve against the valve seat; an electromagnetic driving mechanism for controlling an opening or closing for the electromagnetically-driven intake valve unit; and a guide portion guiding the intake valve, the guide portion being arranged on a pressurizing chamber side with respect to the intake valve, wherein
the intake valve includes an abutting surface that abuts the valve seat to shut off a fuel intake passage and a bottomed part provided at an inner peripheral part of the abutting surface, andthe guide portion has an outer surface part which is inserted into an empty volume of space defined by an inner surface of the intake valve and supports a reciprocating motion of the intake valve relative to the guide portion.