Patent ID: 8070462
Filing Date: 2011-12-06
Classification: F02M,F04B

Abstract:
1. A high-pressure fuel pump comprising: a pump housing including a suction port bore for defining a suction port, a pressure chamber for sucking fuel from the suction port and a delivery port bore for defining a delivery port delivering fuel pressurized in the pressure chamber, the suction port bore and the delivery port bore each having a longitudinal axis defined in the same plane; a plunger for pressurizing fuel sucked in the pressure chamber due to reciprocal motion of the plunger; and a relief valve provided coaxially in the suction port bore, wherein the relief valve opens when a delivery pressure of the fuel delivered from the delivery port exceeds a predetermined pressure, thereby reducing the delivery pressure of the fuel, wherein the suction port bore and the delivery port bore directly communicate with each other through said relief valve via a fuel discharge passage, said fuel discharge passage having a longitudinal axis entirely included in the same plane as the axes of the suction port bore and the delivery port bore.