Abstract: A fuel hose for a fuel pipeline in an motor vehicle has a multilayer structure including a resin barrier layer having low permeability to fuel, an outer rubber layer laminated on an outer side of the barrier layer and an inner rubber layer laminated on an inner side of the barrier layer and defining an inner surface layer of the fuel hose. The multilayer structure is formed throughout an entire length of the fuel hose. A rubber hardness of the inner rubber layer is higher than a rubber hardness of the outer rubber layer.

Abstract: An annular positioning projection integrally has a body portion extending in a circular arc, one end portion projecting from one circumferential end of the body portion toward one raised portion and connected to a radial outer surface of the one raised portion, and the other end portion projecting from the other circumferential end of the body portion toward the other raised portion and connected to a radial outer surface of the other raised portion. An outer surface of one end portion thereof extends in a tangential direction with respect to one circumferential end of an outer surface of the body portion, and an outer surface of the other end portion extends in a tangential direction with respect to the other circumferential end of an outer surface of the body portion.

Abstract: A weld joint has a weld portion for being welded and bonded to a rim portion around an opening of a resin fuel tank. The weld portion is made of a resin alloy material that is obtained by alloying EVOH or PA with a modified HDPE. A highly-weldable layer is provided in an extremity portion of the weld portion throughout an entire circumference of the weld portion. The highly-weldable layer is made of HDPE and/or a modified HDPE having good weldability to the resin fuel tank. An extremity end surface of the highly-weldable layer serves as a weld surface for welding the weld portion to the resin fuel tank.

Abstract: A resin composite fuel hose of a multilayer construction includes a resin layer as a barrier layer having a fuel permeation resistance, an inner rubber layer as an inner surface layer laminated on an inner side of the resin layer and an outer rubber layer laminated on an outer side of the resin layer. The outer rubber layer has a rubber hardness degree equal to or greater than that of the inner rubber layer, and the inner rubber layer has a permanent elongation equal to or less than 90%.

Abstract: A resin composite hose includes a curved portion at an axial position thereof, and has a multilayer construction including a resin layer having permeation resistance to a transported fluid and serving as a barrier layer, an inner rubber layer and an outer rubber layer. The curved portion has a shape of progressively increasing a circumferential length while being flattened progressively increasingly from a curve beginning end of a perfect circle in cross-section to a curve terminal end or a curve middle portion of a flattened circle.

Abstract: A fuel hose comprising a laminated structure of a tubular resin layer and an adjoining rubber layer, the rubber layer being formed by a rubber composition containing the following (A) to (E) as essential components and the following (F) at less than 0.1 parts by weight based on 100 parts by weight of the following (A) as an optional component, and the resin layer being formed by a material containing a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride-perfluoroalkyl vinyl ether quaternary polymer as a main component: (A) diene rubber; (B) a sulfur vulcanizing agent; (C) at least one selected from the group consisting of 1,8-diazabicyclo[5.4.0]undecene-7 salt, 1,5-diazabicyclo[4.3.0]nonene-5 salt, 1,8-diazabicyclo[5.4.0]undecene-7 and 1,5-diazabicyclo[4.3.0]nonene-5; (D) at least one of metallic salt of carbamate and metallic salt of thiazole; (E) magnesium oxide; and (F) zinc oxide.

Abstract: A corrugated hose for transporting a fluid has a multilayer construction including a resin layer as a barrier layer, an inner rubber layer and an outer rubber layer. The corrugated hose has a straight-walled portion, and a corrugated portion including corrugation valleys and corrugation hills, at least on one axial region of the corrugated hose. Each of the corrugation valleys has an inner diameter smaller than an inner diameter of the straight-walled portion, and each of the corrugation hills has an outer diameter equal to or smaller than an outer diameter of the straight-walled portion thereof.

Abstract: A resin composite hose of curved shape includes a resin layer having permeation resistance to a transported fluid and serving as a barrier layer, an inner rubber layer as an inner surface layer on an inner side of the resin layer and an outer rubber layer on an outer side of the resin layer. The resin composite hose has one axial end that is larger in diameter than the other axial end thereof. The resin composite hose has at least one curved portion. The curved portion is formed in a shape of progressively and continuously increasing diameter from a curve beginning end with a small diameter near the other axial end of the resin composite hose to a curve terminal end with a large diameter near the one axial end thereof.

Abstract: A fuel hose has multilayered construction and a flexible corrugated portion with corrugation bottom portions and corrugation peak portions. The fuel hose includes a rubber layer and a resin layer that is a laminated on an inner side of the rubber layer. The resin layer has fuel permeation resistance and serves as a barrier layer. The corrugated portion satisfies a condition of H/W?1.1 when H represents a height of the corrugation measured between an inside of the corrugation bottom portion and an inside of the corrugation peak portion thereof, and 2W represents an axial distance between an inside of the corrugation bottom portion and an inside of an adjacent corrugation bottom portion.

Abstract: On the inner surface of a rubber hose body 12, a laminated hard resin layer 14 is formed to constitute a barrier layer that is impermeable to fluids. A clamping connection is made to hose 10 by a clamping member 24, which clamps the hose body to a companion pipe 18 when the companion pipe is inserted into the hose body. The layer 14 is not laminated over the entire axial length of the hose body but instead leaves an end part exposed. An annular groove is formed at the end 36 of the layer 14 abutting the end part of the hose 10. An elastic impermeable material is placed in the groove which is compressed by the pipe upon insertion. The companion pipe 18 has a protuberance 22 which rests at a position between the end 36 of resin layer 14 and the clamping member so that a seal is formed by elastic compression of the outer surface of companion pipe 18 against the end part of the hose.

Abstract: A hose for transporting a fluid has a tubular hose body, an inner resin layer as a barrier layer having permeation resistance to a fluid transported, and an elastic sealing layer coating in membrane an inner surface of a connecting end portion of the hose. The elastic sealing layer provides a seal between the connecting end portion and the mating pipe by elastic contact with the mating pipe.

Abstract: A hose clamp is mounted on a fit-on portion of a hose such that a clamp band in expanded state enters in an annular clamp mounting portion and an anti-rotation engaging portion is located in a engaging holder portion. The clamp band is diametrically contracted and is tightened to the clamp mounting portion so as not to lower sealing property between the hose and a pipe.

Abstract: A hose for transporting a fluid has a tubular hose body, an inner resin layer as a barrier layer having permeation resistance to a fluid transported, and an elastic sealing layer coating in membrane an inner surface of a connecting end portion of the hose. The elastic sealing layer provides a seal between the connecting end portion and the mating pipe by elastic contact with the mating pipe.

Abstract: A hose clamp has an annular clamp body to be fitted on a clamp mounting portion of an end portion of a hose, and the clamp body is configured so as to tighten the clamp mounting portion by diametrically contracting the clamp body. A holding structure of the hose clamp has an anti-rotation engaging portion on the clamp body, an engaging holder portion on the hose, and a deformation restraining mechanism for restraining deformation of the hose when the clamp body tightens the clamp mounting portion. The engaging holder portion engages with the anti-rotation engaging portion in a circumferential direction when the clamp body is fitted on the clamp mounting portion. The deformation restraining mechanism restrains that the anti-rotation engaging portion is pressed against the engaging holder portion and thereby the hose is deformed via the engaging holder portion.

Abstract: On the inner surface of rubber hose body 12 a laminated hard resin layer 14 is former to constitute a barrier layer impermeable to fluids for fluid transport hose 10, in the connecting structure where a clamping connection is made to hose 10 by a clamping member 24 to clamp the hose body to a companion pipe 18 when the companion pipe is inserted, into the hose body. The layer 14 is not laminated over the entire axial length of the hose body but instead leaves an end part exposed. An annular groove is formed at the end 36 of the layer 14 abutting the end part of the hose 10. An elastic impermeable material is placed in the groove which is compressed by the pipe upon insertion. The companion pipe 18 has a protuberance 22 which rests at a position between the end 36 of resin layer 14 and the clamping member so that a seal is formed by elastic compression of the outer surface of companion pipe 18 against the end part of the hose.

Abstract: A laminated low-permeability elastic ring 40 comprising an outer layer 40A of a low permeability material that possesses impermeability to automotive fuel, and an inner core part 40B of a low temperature-resistant material with excellent low temperature performance in order to maintain high elastic strength at low temperatures for the low permeability material layer.

Abstract: A straight opposing member insertion section located at the end of a hose tube and has a ring-shaped groove for inserting a sealing ring. The opposing member insertion section has a ring-shaped tongue piece and/or a ring-shaped ring supporting section. Tongue-piece has a sloped surface and an overhang positioned over the ring-shaped groove. Ring supporting section is an indentation on the ring-shaped groove that protrudes away from the end of the hose tube. A sealing ring is tightly inserted into the ring-shaped groove. A ring-shaped engagement projection on the end of the tube-shaped opposing member is pushed into the opposing member insertion section until the engagement projection abuts the sealing ring. Sealing ring and the section of the tube wall with the ring-shaped groove can be constructed to handle seal deterioration. The resulting fuel hose connection structure has superior fuel sealing properties, fuel impermeability and can be contructed simplely and inexpensively.

Abstract: A straight opposing member insertion section located at the end of a hose tube and has a ring-shaped groove for inserting a sealing ring. The opposing member insertion section has a ring-shaped tongue piece and/or a ring-shaped ring supporting section. Tongue-piece has a sloped surface and an overhang positioned over the ring-shaped groove. Ring supporting section is an indentation on the ring-shaped groove that protrudes away from the end of the hose tube. A sealing ring is tightly inserted into the ring-shaped groove. A ring-shaped engagement projection on the end of the tube-shaped opposing member is pushed into the opposing member insertion section until the engagement projection abuts the sealing ring. Sealing ring and the section of the tube wall with the ring-shaped groove can be constructed to handle seal deterioration. The resulting fuel hose connection structure has superior fuel sealing properties, fuel impermeability and can be contructed simplely and inexpensively.

Abstract: A fuel hose including a straight insertion end portion at one axial end, an outer layer formed of an elastic body, a groove portion formed coaxially on the inner wall at an axially inward end of the insertion end portion, a thin-walled inner layer made of a resin material of low gasoline permeability and provided to a portion of the inner wall, the portion including the groove portion and extending axially inward from the groove portion, and an annular seal member fitted into the groove portion with the inner layer. The insertion end portion is configured to receive a mating pipe having an engagement protrusion protruding radially outward at an end portion under pressure such that the engagement protrusion presses the seal member fitted into the groove portion to be engaged with the groove portion in a fluid-tight condition. The outer layer is configured to be fitted with a clamp.

Abstract: A quick connector including: (a) a tubular male element having an introduced end portion which has an extreme end portion and an annular protrusion portion; and (b) a tubular female element having a first receiving portion and a second receiving portion which have respective tubular shapes configured to receive therein the annular protrusion portion and the extreme end portion of the introduced end portion of the tubular male element, respectively. The first receiving portion has an elastically-deformable tongue portion which is defined by a U-shaped slot formed through the cylindrical wall of the first receiving portion. The tongue portion extends in a circumferential direction of the tubular female element, and has a free end portion which is displaceable in a radial direction of the tubular female member.