Patent ID: 7168412
Filing Date: 2007-01-30
Classification: F02M

Abstract:
1. An injection nozzle for an internal combustion engine, the nozzle comprising a valve member moveable within a bore of a nozzle body and a seating surface defining a seat cone angle, the valve member including: a first valve region of frustoconical form defining a first cone angle having an angle less than that of the seat cone angle; a second valve region of frustoconical form defining a second cone angle having an angle greater than that of the seat cone angle; and an annular groove that defines, in part, a delivery chamber in communication with at least one nozzle outlet; wherein the annular groove is disposed intermediate the first and second valve regions, respectively, such that a first seating line is defined at the mutual interface between the first valve region and the annular groove and is engageable with the seating surface to control delivery of fuel from a first supply chamber to the delivery chamber, and a second seating line is defined at the mutual interface between the second valve region and the annular groove and is engageable with the seating surface to control delivery of fuel from a second supply chamber to the delivery chamber, the second supply chamber being in communication with the first supply chamber by way of a flow path defined within the valve member, and wherein as the first and second seating lines are disengaged from the seating surface, fuel is permitted to flow past the first and second seating lines into the at least one nozzle outlet.