| 摘要 |
PROBLEM TO BE SOLVED: To provide a double tube connection structure capable of reducing cost by reduction of the number of components, reducing flow resistance, and improving the degree of freedom of connection. SOLUTION: This double tube connection structure is characterized in that, in a distal end of an outer tube 42 of a double tube 4, an outer tube diameter-increased part 42a disconnected from a support rib 43 and increased in diameter relative to a general part of the outer tube 42 is formed; and, in a state where an inner tube-side O-ring 61 with an inner tube distal end 41a of the double tube 4 mounted to its outer periphery is brought into press contact with the inner periphery of a small-diameter hole 53 of a joint member 5 and inserted into the small-diameter hole 53, and an outer tube-side O-ring 62 with the outer tube diameter-increased part 42a mounted to its outer periphery is brought into press contact with the inner periphery of a large-diameter hole 52 of the joint member 5 and inserted into the large diameter hole 52, a collar part 51 in an opening end periphery of the large-diameter hole 52 of the joint member 5 is crimped to connect the outer tube 42 to the joint member 5. COPYRIGHT: (C)2009,JPO&INPIT
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