Caterpillar Inc.

Vladimir Theodorof

Dana Ray Coldren

Marion Billingsley Grant, Jr

A seal arrangement for a needle valve in a fuel injector () includes a nozzle housing () forming an outer cavity () and defining a needle valve seat (). A plurality of nozzle openings () are formed in the nozzle housing () and arranged symmetrically around its centerline at a first radial distance (R). An outer needle valve () is reciprocally mounted in the outer cavity () and has a seat portion () arranged to abut the needle valve seat () when the outer needle valve () is seated or closed. A first ledge () formed on the seat portion () of the outer needle valve () sealably contacts the needle valve seat () along a first line contact seal () and a second ledge () formed on the seat portion () of the outer needle valve () sealably contacts the needle valve seat () along a second line contact seal ().

Seal arrangement for a fuel injector needle valve

An engine system includes an intake system, an internal combustion engine, and an exhaust system. The internal combustion engine includes a fuel droplet generator, and a fuel injector configured to inject fuel directly into a combustion chamber of the internal combustion engine.

Droplet generator for engine system

An apparatus and method for injecting fuel into a cylinder of an engine which includes a fuel injector and a tip located on the fuel injector. The tip and fuel injector are located about a common longitudinal axis and includes a sac portion having a sac chamber, an outer sac surface, and at least one nozzle passage extending from an inner end located in the sac chamber to an outer end located at the outer sac surface, the at least one nozzle passage being at a fixed angle from the longitudinal axis along a central axis. The tip also includes an end surface located substantially adjacent to and parallel with the at least one nozzle passage and extending beyond the outer end of the at least one nozzle passage, and a curvilinear surface located on at least one of the end surface and the outer sac surface and configured such that a portion of fuel being injected through the at least one nozzle passage is directed to follow the curvilinear surface away from the central axis.

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Dunlap, IL, United States of America

Vladimir Theodorof