Patent ID: 7559488

Claim:
An injection nozzle for an internal combustion engine, the injection nozzle including: a nozzle body having a first nozzle outlet, a second nozzle outlet and a first delivery chamber for fuel; an outer valve needle engageable with an outer valve seating to control fuel injection through the first nozzle outlet; an inner valve needle engageable with an inner valve seating to control fuel injection through the second nozzle outlet, wherein the outer valve needle is provided with an axial bore within which the inner valve needle is slidable; the injection nozzle further including: a sleeve member coupled to the inner valve needle and a ring member coupled to the outer valve needle, wherein the ring member is brought into engagement with the sleeve member when the outer valve needle is moved axially through a distance that is greater than a predetermined distance so as to impart axial movement to the inner valve needle; wherein the outer valve needle defines first and second seating lines for engagement with first and second seats, respectively, defined by the outer valve seating; wherein cooperation between the first seating line and the first seat controls fuel flow between the first delivery chamber and the first nozzle outlet and cooperation between the second seating line and the second seat controls fuel flow between a second delivery chamber and the first nozzle outlet and wherein the first delivery chamber communicates with the second delivery chamber via a supplementary flow path defined, at least in part, by a region of the axial bore and at least one radial passage defined in the outer valve needle, the radial passage being in fluid communication with the axial bore and the first delivery chamber.