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A fuel injector includes an injector body with a plunger bore, a nozzle chamber, and a nozzle outlet that opens to the nozzle chamber. A plunger is positioned to reciprocate in the plunger bore between an advanced position and a retracted position. A portion of the plunger and a portion of the plung

A fuel injector includes an injector body with a plunger bore, a nozzle chamber, and a nozzle outlet that opens to the nozzle chamber. A plunger is positioned to reciprocate in the plunger bore between an advanced position and a retracted position. A portion of the plunger and a portion of the plunger bore define a fuel pressurization chamber. At least one of the injector body and the plunger define a main passage extending between the fuel pressurization chamber and the nozzle chamber. At least one of the injector body and the plunger define a restricted passage extending between the fuel pressurization chamber and the nozzle chamber. The restricted passage restricts flow of fuel to the nozzle chamber over the beginning portion of each injection event. The main passage is substantially closed over a portion of the plunger's movement between its retracted position and its advanced position.

대표청구항 ▼

[ We claim:] [6.] A fuel injector comprising:an injector body with a plunger bore, a nozzle chamber and a nozzle outlet that opens to said nozzle chamber;a plunger positioned to reciprocate in said plunger bore between an advanced position and a retracted position;a portion of said plunger and a por

[ We claim:] [6.] A fuel injector comprising:an injector body with a plunger bore, a nozzle chamber and a nozzle outlet that opens to said nozzle chamber;a plunger positioned to reciprocate in said plunger bore between an advanced position and a retracted position;a portion of said plunger and a portion of said plunger bore defining a fuel pressurization chamber;said injector body and said plunger defining at least one passage fluidly connecting said fuel pressurization chamber to said nozzle chamber; andsaid at least one passage having a restrictive flow area over a first portion of said plunger's movement between said retracted position and said advanced position, and having a relatively unrestricted flow area over a different portion of said plunger's movement between said retracted position and said advanced position.