Patent ID: 6644288
Filing Date: 2003-11-11
Classification: F01L,F02B,F02M

Abstract:
An engine of a type in which an air supply valve of a cylinder is opened and closed by rotation of a crankshaft which is transmitted to an air supply cam and an air supply push rod,said engine comprising: the cylinder having an air supply port; a fuel injection device provided on the air supply port of the cylinder; a fuel pump having a fuel pump chamber, a fuel suction hole and a fuel exhaust hole both communicating with said fuel pump chamber, a piston member for setting an inside of said fuel pump chamber to a pressurized state and a depressurized state according to a movement of said air supply push rod, a lead valve for opening said fuel suction hole when the inside of said fuel pump chamber has the depressurized state, and a lead valve for opening said fuel exhaust hole when the inside of said fuel pump chamber has the pressurized state; a pipe connecting said fuel suction hole of said fuel pump and a fuel supply source to each other; a pipe connecting said fuel exhaust hole of said fuel pump and said fuel injection device to each other; an air supply valve provided on the air supply port of the cylinder; an exhaust port provided on the cylinder, an exhaust valve provided on the exhaust port of the cylinder; a piston for the cylinder; an air supply cam rotated by rotation of the crankshaft, the air supply push rod driven by the air supply cam and for opening and closing the air supply valve; an exhaust cam rotated by rotation of the crankshaft and an exhaust push rod driven by the exhaust cam and for opening and closing the exhaust valve; and wherein said piston member sets the inside of said fuel pump chamber to the pressurized state when said air supply push rod operates and said air supply valve opens.