AIR SHROUD FOR AIR ASSIST FUEL INJECTOR

摘要

A fuel injector (10) for a spark ignition internal combustion engine includes inlet and discharge ends (12, 14). The discharge end (14) includes a fuel injection port (16) for supplying a fuel stream directed along an axis (20). An air shroud (22) supplies assist air. The air shroud (22) includes a first end (24) mountable over the injector discharge end (14). The air shroud (22) also includes a second end (26) having an air assist passageway (28) coaxially aligned with the fuel injection port (16) for directing the fuel stream through the passageway (28) along a common axis (20) and guiding a flow of assist air through the passageway (28). The air flowing through the passageway (28) coaxially surrounds the fuel stream to mix with the fuel upon discharge from the passageway (28), thereby providing a precisely targeted atomized fuel spray.