Patent ID: 8257067
Filing Date: 2012-09-04
Classification: F02M,F04B

Abstract:
1. A high pressure pump comprising: a plunger that is reciprocally movable; a housing that includes: a valve body that is placed in the fuel passage and includes a valve seat in a wall surface of the valve body on one side of the valve body, at which the pressurizing chamber is located; a valve member that is placed in the valve body and is slidable along the valve body, wherein the valve member includes a valve head, which is seatable against the valve seat to disable flow of the fuel through the fuel passage and is also liftable away from the valve seat to enable the flow of the fuel through the fuel passage; a stopper that is placed on one side of the valve member, at which the pressurizing chamber is located, wherein the stopper includes: a first urging member that is placed radially inward of the tubular portion and is engaged with the valve member and the bottom portion to urge the valve member in a valve closing direction thereof; a needle that has one end part, which is engageable with the other end part of the valve member that is opposite from the stopper, wherein the needle is movable together with the valve member in a common direction at the valve opening time or the valve closing time of the valve member; a second urging member that urges the needle in the valve opening direction of the valve member; and an electromagnetic drive device that includes a coil arrangement, which attracts the needle in one of the valve closing direction and the valve opening direction of the valve member, wherein: the fuel passage includes: the stopper includes a communication passage that communicates between the volume chamber and one of the intermediate passage and the tertiary passage; and the communication passage is formed at a location, which is spaced from a contact surface between the tubular portion and the valve member by a first predetermined distance and is also spaced from a contact surface between the bottom portion and the first urging member by a second predetermined distance.