FUEL INJECTOR

摘要

A fuel injector (100) for an internal combustion engine is disclosed. The fuel injector is particularly suitable for use as a dual fuel injector, and comprises a generally tubular outer valve needle (130), an inner valve needle (140) slidably received in the outer valve needle (130), and a nozzle body assembly (112) comprising a tip part (120) and a needle guide part (118). The tip part (120) defines a seating region (120f) for the outer valve needle (130), and the needle guide part (118) comprises a guide bore (118e) for slidably receiving the outer valve needle (130). In one embodiment, the tip part (120) and the needle guide part (118) are made from different materials, and a biasing spring (148) for the outer valve needle (130) is housed in the nozzle body assembly (112).

主权项

1. A fuel injector for an internal combustion engine, comprising:
a generally tubular outer valve needle; an inner valve needle slidably received in the outer valve needle; and a nozzle body assembly comprising a tip part and a needle guide part; wherein the tip part defines a seating region for the outer valve needle; and and wherein the needle guide part comprises a guide bore for slidably receiving the outer valve needle and an enlarged diameter lower bore region adjacent the tip part, said lower bore region of needle guide part defining a cavity formed around the outer valve needle for receiving a biasing means.