Patent ID: 8419391
Filing Date: 2013-04-16
Classification: F02M,F04B

Abstract:
1. A high pressure pump for an internal combustion engine comprising: a housing having a fuel gallery; a plunger having a large-diameter portion and a small-diameter portion and movably accommodated in a cylinder formed in the housing, so that a fuel pressurizing chamber is formed in the cylinder at a side of the large-diameter portion of the plunger and a variable volume chamber is formed in the cylinder at the small-diameter portion of the plunger; a fuel inlet port formed in the housing and opening to the fuel gallery for supplying fuel into the fuel gallery; a first opening port formed in the housing and opening to the fuel gallery, the first opening port being communicated to the variable volume chamber through a first fuel passage way formed in the housing; a second opening port formed in the housing and opening to the fuel gallery, the second opening port being communicated to the fuel pressurizing chamber through a second fuel passage way formed in the housing; a suction valve provided in the second fuel passage way; a fuel outlet valve for discharging the fuel pressurized by the fuel pressurizing chamber; a connecting tube member provided in the fuel gallery for communicating the first and second opening ports with each other; and a communication through-hole formed in the connecting tube member so as to communicate an inside of the connecting tube member with the fuel gallery.