Patent ID: 6729286
Filing Date: 2004-05-04
Classification: F02M,F04B,Y10T

Abstract:
A fuel supply apparatus for supplying a fuel to an engine, the fuel supply apparatus comprising;a cylinder provided therein with a fuel pressurization chamber having a fuel suction port and a fuel discharge port, a piston moved slidingly in the axial direction thereof in said cylinder and thereby increasing and decreasing the volume of said fuel pressurization chamber and a tappet which has a pressure receiving surface for contacting a driving cam of said engine and receiving a driving force from said driving cam, and which transmits the driving force to said piston, wherein said piston and said tappet are contacted together through a contact surface, said contact surface having a bulging portion so as to form a clearance around the bulging portion between said piston and said tappet, and wherein said tappet has a groove on its outer surface, said groove is positioned in the region which corresponds to the vicinity of an outer circumference of said pressure receiving surface for preventing the local concentration of stress thereon.