Cummins Inc.

Cummins Intellectual Property, Inc.

Deepak Sahini

Donald J Benson

Tamas Rauznitz

Jeffrey J Sullivan

Marian Trocki

Vijaygandeeban Subbaihaannadurai

W Joseph Satterfield

Robert P Erickson

An injector has an injector body including an injector cavity defining an inner wall and a longitudinal axis, an injector orifice and a plunger slidably disposed within the injector cavity. The plunger has an outer portion and an inner portion at different locations longitudinally along the plunger. The inner portion has a plurality of surface portions including a guiding portion configured to substantially mate with the inner wall of the injector cavity, guide the plunger to slidably move in a direction along the longitudinal axis and substantially prevent the plunger from laterally translating within the injector cavity. The plurality of surface portions also includes a restriction portion configured to form a restrictive cavity between an exterior surface of the inner portion and the inner wall of the injector cavity axially along a length of the inner portion.

Restrictive flow passage in common rail injectors

A fuel pressure relief valve is positioned along a fuel circuit of an internal combustion engine. The pressure relief valve includes a valve body, a first plunger positioned within the valve body, a second plunger positioned within the first plunger, and a valve plug securing the first and second plungers in the valve body. A spring is positioned between the valve plug and the second plunger. Fuel leakage into the pressure relief valve causes the pressure relief valve to lift undesirably in the absence of excessive fuel pressure. The undesirable lifting undesirably affects the operation of the fuel rail and causes wear and shortened life of the pressure relief valve. The first plunger has at least one relief passage or groove located on an exterior surface, relieving the undesirable pressure buildup from a chamber formed between the valve body and the first plunger, eliminating undesirable liftoff events.

Vented pressure relief valve for an internal combustion engine fuel system

Growing community of inventors

Columbus, IN, United States of America

Deepak Sahini