Patent ID: 8529220

Claim:
A high-pressure pump comprising: a plunger performing a reciprocating movement; a housing having a pressurizing chamber where a fuel is pressurized by the plunger; a fuel passage communicating with the pressurizing chamber; and an annular engagement groove formed on a passage wall which defines the fuel passage; an engaged member disposed inside of the passage wall; an engaging member comprised of a plurality of arc-shaped plate members, the engaging member being inserted into the annular engagement groove in such a manner as to be engaged with the engaged member; and a resilient member disposed inside of the engaging member in such a manner as to resiliently bias the arc-shaped plate members radially outwardly, wherein the engaging member has a first curved portion and a second curved portion each of which curvature is different, the first curved portion and the second curved portion are alternately formed in circumferential direction at intervals of 90°, and a curvature radius “Ra” of the first curved portion, a curvature radius “Rb” of the second curved portion, an inner diameter “Rc” of the engagement groove and an outer diameter “Rd” of the engagement groove have a relationship of “Rb”<“Rc”<“Ra”≦“Rd”.