Injector

Details Injector Injector

1999-06-30

2000-08-15

Morris, Lesley D.

Fluid sprinkling, spraying, and diffusing

Injection nozzle opened by relieving supply

239124, 2395332, 2395339, F02M 4700

Patent

active

061023027

ABSTRACT:
A fuel injector (1) including a nozzle body (3) and a needle valve (4) liftably received in a nozzle body hole (21, 34) such that fuel flows to injection openings (16) of the nozzle body through a clearance between the nozzle body hole and needle valve. The clearance includes a larger clearance portion (37) and a smaller clearance portion (38) in series in a fuel flowing direction. The needle valve (4) has a collar (20) to almost plug the larger clearance portion (37) and a throttled fuel passage (22) is formed in the collar (20). Since the collar transversely extends in the larger clearance segment, it has a relatively large area subjected to the fuel pressure. Fuel pressure acts on this large area so that a large pressure difference is obtained across the collar during needle valve opening. Thus, it is possible to close the needle valve at a high speed.

REFERENCES:
patent: 4948049 (1990-08-01), Brisbon et al.
patent: 5556031 (1996-09-01), Cooke et al.
patent: 5860597 (1999-01-01), Tarr

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