Patent ID: 6607218
Filing Date: 2003-08-19
Classification: F16L

Abstract:
A fuel hose connection structure comprising:a fuel hose having a straight insertion end portion at an axial end thereof, a tubular outer layer made of an elastic material and having an annular groove portion formed in an inner wall of the tubular outer layer at an axially inward end of the straight insertion end portion, the annular groove portion being formed coaxially with the inner wall along the entire circumference of the inner wall, a thin-walled inner layer made of a resin material of low gasoline permeability and fixedly bonded to a portion of the inner wall, the portion including at least the annular groove portion and extending axially inward from the annular groove portion, and a thick-walled annular seal member made of an elastic material of low gasoline permeability different from the outer layer and fitted tightly into the annular groove portion entirely lined with the thin-walled inner layer such that the thick-walled annular seal member is entirely partitioned from the tubular outer layer; a tubular mating member including an annular engagement protrusion formed at an end portion thereof along the entire circumference of the tubular mating member in such a manner as to protrude radially outward, the tubular mating member being inserted under pressure from the end portion into the straight insertion end portion of the fuel hose such that the annular engagement protrusion is engaged with the annular groove portion while the annular engagement protrusion presses radially outward on the annular seal member fitted into the annular groove portion; and an annular clamp member fitted onto the tubular outer layer at a position located axially outward with respect to the annular groove portion and adapted to tighten the tubular outer layer securely so as to connect the tubular mating member and the fuel hose in a fluid-tight condition.