| 摘要 |
PROBLEM TO BE SOLVED: To effectively increase a flow amount through injection ports, equalize injection amounts from the injection ports, and improve exhaust performance and output performance. SOLUTION: A sack portion 21 is formed on a leading end of a nozzle body 13, while inlet ends of five injection ports 22 are opened to the sack portion 21. Each injection port 22 is inclined in respect to a center line of a nozzle 1 with a specified angle. An R chamfered portion 23 is formed all the circumference of an opening edge of the inlet side. The R chamfered portion is secondarily processed by abrasive grain fluidizing process. Its radius of curvature is 12 micrometers or more, and preferably 40 micrometers or less. In the case of a sackless nozzle, the radius of curvature of the R chamfered portion 23 is 40μm or more.
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