Patent ID: 6213094
Filing Date: 2001-04-10
Classification: F02M,F04B

Abstract:
A high-pressure fuel pump comprising:a valve assembly disposed between a low-pressure fuel intake passage and a high-pressure fuel discharge passage, said valve assembly opening and closing said low-pressure fuel intake passage and said high-pressure fuel discharge passage; anda high-pressure fuel supply body for pressurizing low-pressure fuel flowing from said low-pressure fuel intake passage and discharging pressurized fuel into said high-pressure fuel discharge passage,said valve assembly including:a first plate having a first fuel inlet connected to said low-pressure fuel intake passage, and a first fuel outlet connected to said high-pressure fuel discharge passage;a second plate having a second fuel inlet having inside dimensions larger than inside dimensions of said first fuel inlet, and a second fuel outlet having inside dimensions smaller than inside dimensions of said first fuel outlet; anda thin, flat valve main body positioned between said first plate and said second plate, said valve main body having an intake-side tongue interposed between said first fuel inlet and said second fuel inlet opening only when fuel flows from said low-pressure fuel intake passage into said high-pressure fuel supply body, and a discharge-side tongue interposed between said first fuel outlet and said second fuel outlet opening only when fuel flows from said high-pressure fuel supply body into said high-pressure fuel discharge passage,said high-pressure fuel supply body including:a casing housing said valve assembly in a recess;a sleeve housed in said recess in surface contact with said valve assembly;a piston slidably inserted into said sleeve forming a fuel pressurization chamber in cooperation with said sleeve, said piston pressurizing fuel flowing into said fuel pressurization chamber from said low-pressure fuel intake passage; anda securing member securing said valve assembly and said sleeve inside said recess by pressing on an outer circumferential portion of said sleeve,a back-pressure chamber connected to said high-pressure fuel discharge passage being formed in said casing so as to face a central portion of said first plate.