Patent ID: 6776358
Filing Date: 2004-08-17
Classification: F02M

Abstract:
A fuel injection nozzle for a diesel engine, comprising:a nozzle body having a tip end portion, a top end portion having an opening edge, and a fuel inlet passage, the tip end portion having a plurality of first nozzle holes, the nozzle body having a first protrusion formed on a peripheral wall adjacent to the opening edge, the first protrusion protruding from an inner peripheral surface toward a center axis of the nozzle body; a needle valve inserted in the nozzle body, the needle valve having a tip end portion, a top end portion, a first guide groove formed on an outer peripheral surface at the top end portion of the needle valve and inclining in a direction with respect to an axial direction of the needle valve, and a second guide groove formed on an outer peripheral surface of the tip portion of the needle valve and inclining in an opposite direction to the first guide groove with respect to the axial direction, the tip end portion having a gap with respect to the tip portion of the nozzle body, the first guide groove being engaged with the first protrusion allowing the needle valve to axially rotate corresponding to a movement of the needle valve in the axial direction; a bag-shaped rotary valve fitted with the tip end portion of the needle valve, the rotary valve having a second protrusion protruding toward the center axis and being engaged with the second guide groove, the rotary valve having a plurality of second nozzle holes configured to have an overlapping area with the plurality of first nozzle holes, the overlapping area increasing as the rotary valve rotates due to the movement of the needle valve in the axial direction.