| 摘要 |
PROBLEM TO BE SOLVED: To promote thinning of an umbrella-like spray form, and atomization of fuel by using an outer peripheral surface of a pintle and an inner circumferential surface of a nozzle hole, and forming an induction face with a long expansion induction length with respect to injection fuel. SOLUTION: The pintle 7 is provided with an umbrella part 17b protruding from a valve hole 8 side to a nozzle hole 10 side and comprising a cone shape with an outer peripheral surface expanding toward an outlet 10a of the nozzle hole 10, and by setting an apex angleαof the cone-like outer peripheral surface of the umbrella part 17b larger than an apex angleβof a cone-like inner circumferential surface of the nozzle hole 10, an extension A of a generatix of the cone-like outer peripheral surface of the umbrella part 17b and a generatix B of the cone-like inner circumferential surface of the nozzle hole 10 are crossed at an intersection P on the nozzle hole 10 inner circumferential surface, and expansion induction of the injection fuel having passed through the valve hole 8 is turned over from the cone-like outer peripheral surface of the umbrella part 17b to the cone-like inner circumferential surface of the nozzle hole 10. COPYRIGHT: (C)2011,JPO&INPIT
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