Patent ID: 6997392
Filing Date: 2006-02-14
Classification: F02M,Y10T

Abstract:
1. An injection valve, comprising: a housing defining an input line; a controllable first valve arranged in said housing and connected to the input line defined in said housing; a pump piston having a first face and a second face arranged in said housing, wherein said housing and said second face of said pump piston delimit a pump chamber, the input line feeding the pump chamber through said first valve, said housing and said first face of said pump piston defining a booster chamber, wherein said first valve comprises a 3/2-way valve having a first line connection connected to the input line, a second line connection connected to a first feeder line defined in said housing and connected to the pump chamber, and a third line connection connected to a discharge line defined in said housing, the first feeder line being connected to the input line in a first operating state of said first valve and the first feeder line being connected to the discharge line in a second operating state of said first valve; a second valve selectively connecting said booster chamber and a fuel reservoir defined by said housing, said housing further defining an injection chamber connected to said booster chamber, wherein said pump piston transmits a pressure in the pump chamber to produce a higher pressure in the booster chamber and the injection chamber; and a movable injection needle projecting into the injection chamber, said injection needle having a pressure surface in the injection chamber, said injection needle being movable for selectively opening or closing spray holes defined in said housing, wherein a position of said injection needle is set in response to the pressure in the pump chamber which is controlled by said first valve.