Caterpillar Inc.

Fred A Camplin

Lianghe Zuo

Michael A Flinn

Thomas G Ausman

Jeffrey D Graves

A fuel injector nozzle has a housing defining a blind bore with at least one fuel injection spray orifice defined at a bottom portion of a spray tip and a guide passage defined at a top portion of the bore. An injection chamber of the bore is disposed between the orifice and the guide passage. A fuel injection passage intersects the guide passage. A needle check is slidably disposed in the blind bore for movement between a first position and a second position. In the first position, a seat portion of the check is disposed in the bore against the bottom portion of the tip while a guide portion of the check together with the guide passage define a first flow area restricting fluid flow therethrough. In the second position, the seat portion of the check is spaced from the bottom portion of the tip, and the guide portion and guide passage define a second flow area larger than the first flow area and less restrictive of flow therepast.

Fuel injector nozzle with guide to check clearance passage providing

A multipiece fuel pump plunger assembly for controlling the fuel injection rate and delivery during the initial injection portion of a fuel injection cycle for an internal combustion engine. The injector includes a two piece plunger assembly including a plunger and a plunger sleeve. The plunger having a small predetermined diameter and being slidably positioned within a plunger sleeve having a diameter greater than the diameter of the plunger. The multipiece plunger is advantageous because it allows for shaping of the rate of fuel injected into the combustion process thereby reducing the excess fuel flow in the early portion of the injection cycle. Elimination of the excess fuel flow results in lower oxides of nitrogen and particulate exhaust emission levels and less engine noise.

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Peoria, IL, United States of America

Fred A Camplin