PIPING

PROBLEM TO BE SOLVED: To improve sealability of piping formed by connecting a hose made of an elastic material and a pipe made of metal.SOLUTION: Piping includes a hose made of an elastic material, a pipe made of metal and having an insert portion 22, and a sleeve for pressing the insert portion 22 and the hose disposed at a radial outer side of the hose to the insert portion 22. The insert portion 22 includes a concave and convex face 30 having an annular groove 31 and an annular projection 32 on an outer peripheral face of the insert portion 22, and the groove 31 includes a groove inclined face 305 thinned toward a tip side of the insert portion, and a groove bottom surface 306 on which an outer diameter extended from the insert portion tip-side end portion to the projection 32 on the groove inclined face 305 is constant. As the groove 31 includes the groove bottom surface 306 between the groove inclined face 305 and a seal inclined face 301, a space in which the hose is bitten into the groove 31 is increased, and the amount of biting of the hose is increased.SELECTED DRAWING: Figure 3 【課題】弾性材製のホースと金属製のパイプとを接続した配管のシール性を向上させる。【解決手段】弾性材製のホースと、インサート部２２を有する金属製のパイプと、インサート部２２およびホースの径方向外側に配置されホースをインサート部２２に押し付けるスリーブとを備え、インサート部２２は、インサート部２２の外周面に、環状の溝３１と環状の突起３２とを有する凹凸面３０を備え、溝３１は、インサート部先端側に向かって細くなる溝傾斜面３０５と、溝傾斜面３０５におけるインサート部先端側端部から突起３２まで延びる外径が一定の溝底面３０６とを備える。これによると、溝３１は溝傾斜面３０５とシール傾斜面３０１との間に溝底面３０６を備えるため、ホースが溝３１に食い込むための空間が大きくなってホースの食い込み量が大きくなる。【選択図】図３