High pressure pump

摘要

A high pressure fluid pump for use such as a fuel injection pump. The pump utilizes a diaphragm for cooperation with valve controlled passage structure leading to the pump chamber to provide the desired high pressure output. The diaphragm is defined by one portion of a diaphragm element, which portion is sealingly bonded peripherally to the wall of the valve body defining the valve chamber. A second portion of the diaphragm element formed unitarily integrally with the diaphragm portion is free to move in the valve chamber and includes a portion extending into a plunger bore for transmitting forces from a reciprocating plunger having an inner end extending into the bore to the diaphragm. The plunger further is provided with a synthetic resin tip. The plunger and tip are arranged to be lubricated during reciprocation of the plunger. A force transfer element extends between the tip and the portion of the diaphragm element extending into the bore and transfers the intermittent pumping force from the plunger tip to the diaphragm element. The diaphragm element may be formed of a flexible material which is self-bonding to the wall of the pump body.