Variable delivery fuel supply device

摘要

A variable delivery fuel supply device capable of improving linearity of discharge characteristics with respect to a rotational angle of a cam and reducing abrasion of the cam. The variable delivery fuel supply device comprises: fuel injection valves 1a to 1d respectively for injecting a fuel to cylinders of an internal combustion engine; a delivery pipe 2 for supplying a pressurized fuel to said fuel injection valves 1a to 1d; and a fuel pump 3 for taking a fuel from a fuel intake passage 24 through an intake valve 25 into a pressurization chamber 17 during an intake stroke, for pressurizing the fuel and for discharging the pressurized fuel through a discharge valve 26 to the delivery pipe 2 during a discharge stroke by reciprocating movement of a plunger 14 in each cylinder 13 from a bottom dead point to a top dead point; wherein the pressure in the pressurization chamber 17 is relieved at a position set to a predetermined value before reaching the top dead point in the course of the discharge stroke in which the plunger 14 of the fuel pump 3 moves from the bottom dead point to the top dead point.