Patent ID: 8167339

Claim:
A resin tube-equipped quick connector for connecting a fuel-transporting resin tube to a mating pipe, comprising a connector body, a C-shaped retainer and a seal member; wherein the connector body has a generally tubular shape as a whole, has a retainer holding portion adapted to receive and hold the C-shaped retainer in an axial opening at one axial end thereof, and also has at an opposite axial end thereof, a press-fitting portion which is press-fitted into the interior of the resin tube from one end thereof, wherein an exterior of the press-fitting portion consists of the following portions along an axial length (L) thereof, one immediately after another: a first truncated-conical-shaped portion extending from a ring-shaped end face on a tip end of the press-fitting portion; a first cylindrical-shaped root portion, a first truncated-conical-shaped annular projection followed by a first ring-shaped face and a second cylindrical-shaped root portion, a second truncated-conical-shaped annular projection followed by a second ring-shaped face and a third cylindrical-shaped root portion, a second truncated-conical-shaped portion, which ends abutting with a flat ring-shaped end face of the connector body, wherein the resin tube includes a press-fit undergoing portion into which the press-fitting portion is press-fitted, wherein the press-fit undergoing portion of the resin tube into which the press-fitting portion is press-fitted has an internal diameter (d 3 ) substantially equal to 3.5 mm, and a portion of the resin tube into which the press-fitting portion is not press-fitted has an internal diameter (d 1 ) substantially equal to 2.5 mm, and wherein a ratio of the axial length (L) of the press-fitting portion to an inner diameter (d 4 ) of the press-fitting portion is substantially equal 7.25 to 1.0.