Fuel injection nozzle for internal combustion engines

A fuel injection nozzle for internal combustion engines comprising, in combination, a nozzle body having a blind bore, an axially displaceable, shaft-like valve needle radially guided in said nozzle body blind bore, means disposed adjacent the upper end of said valve needle for yieldingly urging said valve needle in a closing direction, the front face of said needle remote from said urging means together with the blind end of said nozzle body blind bore defining a pressure chamber, a pressure line extending within said nozzle body for supplying fuel to the nozzle, a connecting channel extending within the outer surface of said needle for connecting said pressure chamber with said pressure line, said connecting channel beginning in the portion of said needle guided within said blind bore, said pressure line being arranged to discharge fuel into said blind bore opposite the beginning of said connecting channel, said valve needle having the same diameter, representing the largest diameter, at least in the section located between said beginning of said connecting channel and said pressure chamber and a pressure-relieved annular chamber serving as a pressure barrier disposed within said valve needle section.