Injector nozzle for a diesel engine

Claim 1

An injector nozzle for a diesel engine comprising: a) a housing including: i) a plurality of atomizing holes through which a fuel exits the housing, ii) a cylindrical channel in fluid communication with the atomizing holes for supplying fuel thereto, and iii) a truncated conical seat forming an opening in fluid communication with the cylindrical channel for supplying fuel to the cylindrical channel, said conical seat having a vertex angle associated therewith and a minimum diameter section; and b) a needle installed in the housing, said needle including: i) a shut-off truncated cone with a shut-off edge for engagement with the conical seat, ii) a throttling element with a throttling edge and a lateral surface, the throttling edge being located level with the minimum diameter section of the conical seat in a closed position of said nozzle, iii) an intermediate portion which connects the throttling element with the truncated cone, said intermediate portion having a lateral surface such that said lateral surface of the intermediate portion is located inside an imaginary cone extending between said truncated cone shut-off edge and said throttling edge, said imaginary cone having a vertex angle which is in the range of 0.5 to 2.0 degrees greater than the vertex angle of the conical seat, and iv) the throttling edge being formed by a line of intersection of the lateral surface of the intermediate portion of the needle and the lateral surface of the throttling element.