| 摘要 |
PROBLEM TO BE SOLVED: To hold a clearance with prescribed accuracy by fixing a cylindrical body which is formed of a solid material and whose frictional resistance is smaller than frictional resistance formed between a nozzle main body and a valve element, on a sliding surface of the nozzle main body and the valve element, and slidably arranging the valve element on a nozzle main body through the cylindrical body. SOLUTION: A needle 5 is slidably inserted into a valve sliding hole 3a through cylindrical bodies 10, 11. The cylindrical bodies 10, 11 are fixed to inner circumferential surfaces of the large diameter part 3b and a small diameter hole part 3c of the valve sliding hole 3a. A needle 5 is slidably supported by the cylindrical bodies 10, 11. The cylindrical bodies 10, 11 are formed of a slid material. In the cylindrical bodies 10, 11, a material is employed whose frictional resistance between an inner circumferential surface and an outer peripheral surface of the needle 5 is smaller than a frictional resistance in the case where the inner circumferential surfaces of the large diameter hole part 3b and the small diameter hole part 3c and an outer peripheral surface of the needle 5 are brought into directly contact with each other. It is thus possible to prevent early wasting of a sliding surface between the nozzle main body and the valve element and seizing, and it is also possible to hold clearance accuracy with a desired accuracy.
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