Siemens Automotive Corporation

Lisa Johnenne Egizi

Debora E Nally

Ross W Wood

A fuel injector for a spark-ignition, internal combustion engine includes a fuel injector body having inlet and discharge ends. The discharge end includes a fuel swirl disk for inwardly directing a plurality of fuel streams to provide a turbulent swirling stream of fuel directed axially outwardly. A valve regulates the outward axial flow of the turbulent swirling fuel stream. A mixing chamber having an air supply provides a flow of assist air and a discharge passageway. The mixing chamber receives the turbulent swirling fuel stream which is atomized as it enters the mixing chamber and the atomized fuel mixed with the assist air is directed outwardly through a discharge passageway.

Air assist fuel injector with fuel swirl feature

A fuel injector needle has a separate pin element fixed in an axial bore in a tip end of the needle, the bore surrounded by an annular partially spherical region sealing to a valve seat. The pin element is separately manufactured and has a conical spray pattern shaping feature at one end protruding from the needle tip. The annular region can be accurately formed and finished prior to installation of the pin element.

Fuel injector needle tip

An air assist fuel injector wherein a shroud member is snapped on the outside of the valve body to provide a path for assist air to atomize the fuel exiting the injector. Located on the bottom surface of the shroud is a belleville washer to preload air deflection disks against the bottom of the valve body. Snap-on connectors cooperate with the valve body to locate and retain the shroud to the valve body.

Growing community of inventors

Portsmouth, VA, United States of America

Lisa Johnenne Egizi