SCREW STRUCTURE, MALE SCREW PART AND FEMALE SCREW PART

摘要

PROBLEM TO BE SOLVED: To reduce local stress concentration acting on a male screw part to hardly generate fracture of the male screw part.SOLUTION: In a screwing structure 1 formed by screwing a male screw part 42 and a female screw part 82, a pressure-welding amount between the mutually opposite flange surfaces of the male screw part 42 and the female screw part 82 is changed along the axial direction of the male screw part 42.SELECTED DRAWING: Figure 2