Perfected diesel engine electromagnetic fuel injector

Claim 1

A Diesel engine electromagnetic fuel injector comprising: a plunger (1) sliding inside the injector body (2), for controlling fuel passage between an injection chamber (3), supplied with fuel under pressure, and at least one injection orifice (4) formed in an injection nozzle (5) secured to said body (2); an electromagnetic fuel metering valve (6) for controlling fuel passage, through a drain orifice, between a control chamber (8), supplied with fuel under pressure, and a low-pressure chamber, so as to reduce the pressure of the fuel in said control chamber (8) by draining the same through said orifice; surface portions of said plunger being exposed to the fuel inside said injection chamber (3) and said control chamber (8), so that the pressures inside said chambers and acting on said surface portions displace said plunger (1) when the pressure in said control chamber (8) falls to a given value; said fuel under pressure being supplied to said injection chamber (3) and said control chamber (8) by means of a single fitting (13) connected to a supply pipe (14) and coming out inside a supply orifice (15) formed in said body (2) and communicating with said control chamber (8) and with a supply duct for feeding fuel into said injection chamber (3) and substantially formed inside a series of sleeves (16,17) housed inside an axial hole (19) in said body (2) and inside which said plunger (1) slides axially; characterised by the fact that said fuel supply orifice (15) comes out inside an annular chamber (25) formed between the outer surface of the top sleeve (16) in said series and said axial hole (19) in said body (2); said annular chamber (25) communicating with said control chamber (8) via at least one radial hole (26) formed in said sleeve (16), and with a helical groove (27) formed on the outer surface of said sleeve (16) and defining the first portion of said duct supplying fuel to said injection chamber (3).