Fuel injector for e.g. direct injection diesel internal combustion engine, has orifice whose outlet is edged on side by protrusion with lateral surface that is adjacent to orifice and forms acute angle with axis of orifice

摘要

The injector has a needle (2) movable in a nozzle (1) with a conical end (3) having fuel realizing orifices (4) distributed around an axis (X- X`) of the nozzle. An outlet of each orifice is edged on a side by a protrusion (5) whose lateral surface (6) is adjacent to the orifice and forms an acute angle (`b) with an axis (7) of the orifice. The protrusion deviates fuel jets (8) exiting from the orifice with respect to the axis (7) by coanda effect, and is located in downstream of the orifice relatively in circulation direction of swirl air generated by helical forms of an inlet conduit.