Fuel injector
AssigneesWestport Power Inc., Delphi International Operations Luxembourg S.A.R.L.
InventorsGeorge A. MEEK, Lukhbir PANESAR
Life of this patent
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Abstract
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).
Claims21
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.
(canceled)
Dependencies are inferred from the claim text.