Resin fuel tank

Abstract

A component attaching hole 5 is opened in the tank main body 1 constructed by laminating an inner shell 3 and an outer shell 4 via a fuel permeation preventing layer 2, and the auxiliary component 6 is welded to the external surface of the tank main body 1 in such a manner as to cover the component attaching hole 5. The component attaching hole is formed so as to be tapered in such a manner that the component attaching hole gets wider toward the external surface of the tank main body 1, and a boss portion 9 is formed on the auxiliary component 6 which is tapered so as to fit in the component attaching hole 5, whereby a fuel permeation preventing layer 8 laminated on the internal surface of the auxiliary component 6 is made to extend over the external surface of the boss portion 9. When the tank main body 1 and the auxiliary component 6 are welded together, the fuel permeation preventing layer 8 on the external surface of the boss portion 9 is tightly joined to the fuel permeation preventing layer 2 exposed at the component attaching hole 5.

Dependencies are inferred from the claim text.