Patent ID: 8672239
Filing Date: 2014-03-18
Classification: F02M

Abstract:
1. A fuel injector for an automotive internal combustion engine, comprising: a plurality of nozzle holes; a seat section positioned upstream of the nozzle holes; a valve element that closes a valve when brought into contact with the seat section and opens the valve when separated from the seat section; and a circular cone that is substantially conical in shape, tapered from an upstream end to a downstream end, and provided with the seat section and an inlet opening of the nozzle holes, wherein the plurality of nozzle holes have an identical shape and a shape of a cross-section of each of the nozzle holes is substantially out-of-round, the cross-section being perpendicular to a central axis of each of the nozzle holes, and wherein the cross-section of each of the nozzle holes is rotated around the central axis of each of the nozzle holes; a rotation angle of the cross-section is set in such a manner that a relationship between a conical surface of the circular cone and the rotation angle is different among at least two of the nozzle holes; and wherein a first axis line is formed by projecting a center line of a fuel injector main body onto a plane, the plane contains the cross-section and is perpendicular to the central axis of each of the nozzle holes; a second axis line is defined for the cross-section of each of the nozzle holes; angle β is formed by the first axis line and the second axis line on the plane; at least two of the nozzle holes differ in the angle β.