Fuel injector having a trapped volume nozzle assembly with a pre

Details Fuel injector having a trapped volume nozzle assembly with a pre Fuel injector having a trapped volume nozzle assembly with a pre

1998-08-07

2000-09-19

Douglas, Steven O.

Fluid sprinkling, spraying, and diffusing

With system fluid relief or return to supply

239 88, B05B 900

Patent

active

061199621

ABSTRACT:
A fuel injector includes an injector body that defines a pressure relief passage with one end opening into a trapped volume, and a fuel pressurization chamber in fluid communication with a nozzle outlet. A needle valve member is positioned in the injector body and moveable between an inject position in which the fuel pressurization chamber is open to the nozzle outlet, and a closed position in which the nozzle outlet is blocked. The needle valve member has a closing hydraulic surface exposed to fluid pressure in the trapped volume. A pressure relief valve is positioned in the pressure relief passage, and has a valve member with an opening surface exposed to fluid pressure in the trapped volume, and a closing surface exposed to fluid pressure in the fuel pressurization chamber.

REFERENCES:
patent: 4213564 (1980-07-01), Hulsing
patent: 4979676 (1990-12-01), Heln
patent: 5035221 (1991-07-01), Martin
patent: 5429309 (1995-07-01), Stockner
patent: 5826793 (1998-10-01), Askew

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