| 摘要 |
PROBLEM TO BE SOLVED: To provide a hose fastening part pipe bulge shape to improve reliability of a fastening part without sacrificing hose insertion workability. SOLUTION: A part from a bulge head end 10 to a bulge top point part 11 is constituted of a first rectilinear part 12 and a second rectilinear part 14. An angleθ1 made by the first rectilinear part 12 and a pipe longitudinal direction is set smaller than an angleθ2 made by the second rectilinear part 14 and the pipe longitudinal direction, and a contact angleθ3 of a bulge shoulder part 16 to connect the bulge top point part 11 and a pipe outside diametrical part to each other and the pipe outside diametrical part is set in a range of 45-135 degrees.
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