Patent ID: 9726128
Date: 2017-08-08
CPC Classifications: F02M,F04B

Claim:
1. A high-pressure pump comprising: a plunger performing a reciprocating movement; a cylinder integrally having a flat bottom portion, a cylindrical portion of which one end is closed by the flat bottom portion and a large-diameter cylindrical portion, a housing having a small engaging hole with which outer circumference walls of the flat bottom portion and the cylindrical portion are axially engaged by press-fit, the small engaging hole axially penetrating the housing, a cup-shaped cover formed independently from the housing, the cover accommodating the cylinder therein; wherein the housing is comprised of an upper housing having the small engaging hole and a lower housing formed independently from the upper housing and having the large engaging hole; the cylinder has a protrusion which protrudes radially outwardly; the lower housing has a cylinder-contacting portion which is in contact with the protrusion to restrict a movement of the cylinder; the large-diameter cylindrical portion of the cylinder is press-fitted into the large engaging hole of the lower housing; and the protrusion of the cylinder has an upper surface which is in contact with the cylinder-contacting portion of the lower housing; the lower housing includes a cylindrical cylinder-holding-portion and a flange portion protruded from the lower part of the cylinder-holding-portion; the flange portion has a bolt-through hole through which a bolt is inserted so that the flange portion is fixed on an engine, and the cup-shaped cover has an opening end that is joined to the lower housing in a fluid-tight manner, so that a fuel gallery is defined by the cup-shaped cover and the lower housing.