| 摘要 |
<p>PROBLEM TO BE SOLVED: To secure fluid adhesion properties in a mutual relation between the outer circumferential surface of a nipple, and the inner circumferential surface of a tube, and prevent the tube from falling down carelessly. SOLUTION: This combining structure comprises a tube 2 pressed in a nipple 1 with pressure, which has the plural number of peripheral projections 10a at the outer circumferential part, and its pull-out strength and sealing performance are so designed as to be secured by letting the peripheral projections 10a bite in the inner wall of the tube 2. The inner wall surface of a short pipe 3 made out of material, is in a pressure contacting condition, which is almost neither swelled nor lowered in stiffness even if it is outwardly inserted in the tube 2, and furthermore, is brought into contact with fuel high in temperature, in the outer circumferential surface area of the tube 2, which is swelled up because the peripheral projections 10a bite in the inner wall of the tube 2.</p> |
