| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection nozzle wherein fuel consumption and exhaust emission discharge of a combustion engine are improved. SOLUTION: The fuel injection nozzle for the combustion engine includes a nozzle body with a cavity and a nozzle needle set in the cavity of the nozzle body to be axially movable. The cavity is separated into a valve seat hole and a blind hole continuing to the valve seat hole. A fuel injection passage is branched from the blind hole and the valve seat hole is formed in a conical shape tapered in a direction to the blind hole. An inner wall enclosing the valve seat hole is defined as a first valve seat surface. The nozzle needle includes a valve seat part and a tip end part continuing to the valve seat part. An outer circumference of the valve seat part is a tapered conical shape and the outer circumference is defined as a second valve seat surface. As the second valve surface is set to cooperate with the first valve seat surface, a valve capable of controlling a flow rate cross section is formed. The blind hole is formed to be a conical shape tapered in a direction toward a bottom of the blind hole. COPYRIGHT: (C)2011,JPO&INPIT |
