Fuel injection nozzle for internal combustion engines

Claim 1

A fuel injection nozzle for internal combustion engines including a nozzle body having an inner bore, a valve needle including a body portion whose major length portion is guided in the inner bore of said nozzle body, said valve needle including a headed area and a contiguous neck portion, said nozzle body having a shoulder area, a compression spring member supported on one end by said shoulder area, a spring plate element including a shouldered end positioned in abutment with another end of said spring member, said spring plate element having an elongated dependent cup shaped body that extends from said shouldered end coaxially into said spring member along a major portion of the length of said spring member and terminates in a base, provided with an oblong recess passage through which said headed area of said valve needle extends, a recess in said base in which said headed area having a tapered portion extending from said neck portion to the outer dimension of said head seats, said recess including at least one straight side wall with upwardly tapered walls, characterized in that said headed area of said valve needle further includes oppositely disposed flattened face portions which lie in planes that are coplanar with said neck portion of said valve needle, said flattened face portions arranged to be introduced through said oblong passage in said base of said spring plate and rotated 90° to lock the valve needle in said recess in the base of said spring plate element under influence of said spring member.