Resin fuel tank

Details Resin fuel tank Resin fuel tank

2000-10-13

2001-10-23

Castellano, Stephen (Department: 3727)

Receptacles

Vehicle mountable tank

C220S601000

Reexamination Certificate

active

06305568

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a resin fuel tank for use mainly for vehicles.
2. Description of the Related Art
Conventionally know is a resin fuel tank in which a tank main body is constructed by laminating a resin inner shell and a resin outer shell via a fuel permeation preventing effect. Also know among those resin fuel tanks is a resin fuel tank in which a component attaching hole is opened in a tank main body and a resin auxiliary component is welded to the external surface of the tank main body in such a manner as to cover the component attaching hole. In this case, a fuel permeation preventing layer is laminated on the internal surface of the auxiliary component.
In the aforesaid conventional resin fuel tanks, the fuel permeation preventing effect can be improved individually with respect to the tank main body and the auxiliary component, but there may be a risk of fuel permeating from the welded portion between the tank main body and the auxiliary component.
SUMMARY OF THE INVENTION
The present invention was made in view of the above problem, and an object thereof is to provide a resin fuel tank in which fuel permeation from a welded portion between a tank main body and an auxiliary component can also securely be prevented.
With a view to solving the above problem, according to the invention, there is provided a resin fuel tank in which a tank main body is constructed by laminating a resin inner shell and a resin outer shell via a fuel permeation preventing layer, wherein a component attaching hole is opened in the tank main body and a resin auxiliary component is welded to an external surface of the tank main body in such a manner as to cover the component attaching hole. The component attaching hole is formed to be tapered in such a manner that the component attaching hole gets wider towards the external surface of the tank main body. A boss portion which is tapered so as to fit in the component attaching hole is formed on the auxiliary component. And, a fuel permenation preventing layer laminated on an internal surface of the auxiliary component is made to extend over an external surface of the boss portion. Thus, the fuel permeation preventing layer on the external surface of the boss portion is tightly joined to the fuel permeation preventing layer of the tank main body which is exposed at the component attaching hole.
According to the invention, the fuel permeation preventing layer of the tank main body is continuous with the fuel permeation preventing layer of the auxiliary component to thereby prevent the deviation of the fuel to the welded portion between the tank main body and the auxiliary component, thus making it possible to securely prevent the permeation of the fuel from the welded portion.


REFERENCES:
patent: 4369894 (1983-01-01), Grover et al.
patent: 4700868 (1987-10-01), Dirkin
patent: 5344038 (1994-09-01), Freeman et al.
patent: 5601205 (1997-02-01), Prechtel
patent: 6227402 (2001-05-01), Shimojima et al.

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