Patent ID: 6161774
Filing Date: 2000-12-19
Classification: F02M

Abstract:
An electromagnetic injector for internal combustion engines, comprising a hollow body having a first cylindrical cavity provided with a first axis; an injection nozzle carried by said hollow body at one end of said first cavity, said nozzle having an injection chamber communicating with a pressurized fuel supply conduit and with at least one injection orifice; a control rod movable axially in said first cavity to open and close said at least one orifice; a lateral arm integral with said hollow body, said lateral arm having a second cylindrical cavity provided with a second axis radial with respect to said first axis; a metering valve housed in said second cavity and including a drain conduit radial with respect to said first axis and communicating with a drain chamber for surplus fuel; said metering valve further including a shutter; an electromagnet having an armature connected to control said shutter to open and close said drain conduit; said electromagnet having a cylindrical core coaxial with said second cavity, said armature being movable in said second cavity along said second axis; and a control chamber for hydraulically controlling said rod, said control chamber having an inlet conduit parallel to said first axis and communicating with said supply conduit so that when said shutter is released by said armature the pressurized fuel in said control chamber is drained through said drain conduit and the pressurized fuel in said injection chamber moves said rod to open said at least one orifice, said drain chamber (36) communicating with a drain fitting (51) extending radially with respect to the axis of said rod (12), said inlet conduit (33) and said injection chamber (16) communicating with a supply cavity (19) coaxial with said inlet conduit (33) and connectable to a further fitting (87) fitted to said supply conduit (82).