A FUEL INJECTION NOZZLE

摘要

A fuel injection nozzle, generally relating to the field of internal combustion engine, comprises a nozzle body, a fuel valve and a guide cap, wherein when the fuel pressure in said nozzle body exceeds the predetermined level, said fuel valve opens and the fuel therein is injected out via said guide cap, featuring that said fuel valve comprises a valve body, a valve seat and a spring, wherein the space between the rear end of said valve seat and said nozzle body defines the fuel cavity, an intake port to introduce fuel into said fuel cavity is opened in said nozzle body, said spring is disposed between said valve body and said valve seat in the fuel cavity to keep said fuel valve normally closed, the volume between the front end of said valve seat and said guide cap defines a residual space, and one or more orifices communicated with said residual space are opened in said guide cap. The present invention illustrates a brand new type of fuel injection nozzle for pulsed fuel pumps applied in electrically-controlled fuel injection systems, which has the characteristic of simple construction and small size, great freedom of spray direction design and the seat face not being directly scorched by flames in the combustion chamber.