| 摘要 |
PROBLEM TO BE SOLVED: To process easily a nozzle body seat part and a nozzle needle seat part and to restrain abrasion in the nozzle body seat part and the nozzle needle seat part. SOLUTION: The nozzle needle seat part 22 has a straight shape without a ridge line. By forming a toroidal ridge line 16 for seating with the nozzle needle seat part 22 on the nozzle body seat part 12, stress in the seat part can be dispersed widely on the nozzle body seat part 12 larger in volume than the nozzle needle seat part 22 even when the nozzle needle seat part 22 sits on (collides with) the nozzle body seat part 12 for generating the stress in the seat part, accordingly the maximum stress in the seat part can be lowered. Thereby the abrasion in the nozzle needle seat part 22 and the nozzle body seat part 12 can be restrained. Since the seat part shape of a nozzle body 1 can be easily processed and the seat part shape of a nozzle needle 2 has a simple shape, manufacturing costs of a hole type fuel injection nozzle can be reduced.
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