Electrically operated injector for an I.C. engine

Claim 1

An electrically operated injector of the type particularly constructed for the intermittent delivery of fuel to an I.C. engine, said injector including a core of ferromagnetic material, a coil surrounding said core, an injection nozzle, a mobile cup-shaped armature having means for acting as a closure element for said injection nozzle and disposed between said core and said injection nozzle, said armature being coaxial with both said core and said injection nozzle, said armature having a base wall and a side wall, a return spring urging said armature against said injection nozzle to close said injection nozzle, and a tubular element projecting from the interior of said core and forming an inner guide for said armature and a duct for conveying fuel to said injection nozzle, said injector being characterized in that there is a washer of impact-resistant material disposed between said base wall and said side wall of the armature, said tubular element in combination with said washer also forms stop means for limiting a lifting stroke of said armature, said tubular element lower annular end wall is spaced axially from an upper surface of said washer by a distance equal to a selected lifting stroke of said armature.