Closure system

Patent metadata

Field	Value
Publication number	US-9731595-B2
Application number	US-201214128149-A
Country	US
Kind code	B2
Filing date	Apr 27, 2012
Priority date	Jun 22, 2011
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

The invention relates to a closure system on a fuel tank ( 2 ) of thermoplastics with barrier properties for hydrocarbons. The closure system comprises at least one orifice ( 4 ), with a closure cap ( 5 ) which closes the orifice ( 4 ) in a sealing manner and which cooperates in a form-fitting manner with closure means provided at the circumference of the orifice ( 4 ) and encloses at least one first sealing means between it and a tank wall ( 3 ). The closure system ( 1 ) according to the invention is distinguished in that the tank wall is sealed in the region of the orifice ( 4 ) with at least one second sealing means, which covers and/or shields a part of the tank wall surfaces exposed to hydrocarbons.

First claim

What is claimed is:

1. A fuel tank closure system, comprising:
a fuel tank to hold hydrocarbon fuel, the fuel tank having a tank wall of thermoplastics with a barrier layer for hydrocarbons, with at least one orifice having a circumference;
a closure cap which cooperates with a closure means of the fuel tank to cover the orifice, wherein the closure means is provided at the circumference of the orifice and configured such the closure cap is fastenable to the fuel tank;
at least one first seal enclosed between the closure cap and an outer surface of the tank wall; and
at least one second seal in a region of the orifice which covers or shields a part of the tank wall exposed to hydrocarbon fuel when placed in the fuel tank;
wherein the orifice has an edge with a circumferential face defined by a cross-sectional thickness of the tank wall, and the second seal covers or shields the cross-sectional thickness of the tank wall defining the circumferential face of the edge of the orifice from exposure to the hydrocarbon fuel; and
wherein the second seal comprises a surface treatment of the tank wall, which is restricted to treating the tank wall in the region of the orifice.

2. The closure system according to claim 1 , wherein the second seal comprises a surface covering on the tank wall, which is restricted to covering a surface of the tank wall in the region of the orifice.

3. The closure system according to claim 2 , wherein the surface covering comprises a coating.

4. The closure system according to claim 1 , wherein the surface treatment comprises at least one of fluorination and sulphonation.

5. The closure system according to claim 1 , wherein the second seal comprises an elastomeric ring in the orifice.

6. The closure system according to claim 5 , wherein the elastomeric ring comprises a sealing skirt which covers the circumferential face of the edge of the orifice.

7. The closure system according to claim 1 , wherein the closure cap comprises a collar which protrudes into the orifice and the collar comprises at least one circumferential sealing lip, which covers the circumferential face of the edge of the orifice.

8. The closure system according to claim 7 , wherein the sealing lip is captively fastened to the closure cap.

9. The closure system according to claim 7 , wherein the sealing lip is injection moulded onto the closure cap.

10. The closure system according to claim 1 , wherein the closure system comprises a bayonet closure.

11. The closure system according to claim 1 , wherein the closure means comprises at least one bayonet ring, which is moulded into the tank wall.

12. The closure system according to claim 3 , wherein the coating is a plasma coating.

13. The closure system according to claim 3 , wherein the coating is a finish coating.

14. The closure system according to claim 11 , wherein the bayonet ring comprises a plurality of retaining claws.

15. A fuel tank closure system, comprising:
a fuel tank to hold hydrocarbon fuel, the fuel tank having a tank wall of thermoplastics with a barrier layer for hydrocarbons, with at least one orifice having a circumference;
a closure cap which cooperates with a closure means of the fuel tank to cover the orifice, wherein the closure means is provided at the circumference of the orifice and configured such the closure cap is fastenable to the fuel tank;
at least one first seal enclosed between the closure cap and an outer surface of the tank wall; and
at least one second seal in a region of the orifice which covers or shields a part of the tank wall exposed to hydrocarbon fuel when placed in the fuel tank;
wherein the orifice has an edge with a circumferential face defined by a cross-sectional thickness of the tank wall, and the second seal covers or shields the cross-sectional thickness of the tank wall defining the circumferential face of the edge of the orifice from exposure to the hydrocarbon fuel;
wherein the second seal comprises a surface covering on the tank wall, which is restricted to covering a surface of the tank wall in the region of the orifice; and
wherein the surface covering comprises a coating.

16. The closure system according to claim 15 , wherein the second seal comprises a surface treatment of the tank wall, which is restricted to treating the tank wall in the region of the orifice.

17. The closure system according to claim 16 , wherein the surface treatment comprises at least one of fluorination and sulphonation.

18. The closure system according to claim 15 , wherein the second seal comprises an elastomeric ring in the orifice.

19. The closure system according to claim 18 , wherein the elastomeric ring comprises a sealing skirt which covers the circumferential face of the edge of the orifice.

20. The closure system according to claim 15 , wherein the closure cap comprises a collar which protrudes into the orifice and the collar comprises at least one circumferential sealing lip, which covers the circumferential face of the edge of the orifice.

21. The closure system according to claim 20 , wherein the sealing lip is captively fastened to the closure cap.

22. The closure system according to claim 20 , wherein the sealing lip is injection moulded onto the closure cap.

23. The closure system according to claim 15 , wherein the closure system comprises a bayonet closure.

24. The closure system according to claim 15 , wherein the closure means comprises at least one bayonet ring, which is moulded into the tank wall.

25. The closure system according to claim 15 , wherein the coating is a plasma coating.

26. The closure system according to claim 15 , wherein the coating is a finish coating.

27. The closure system according to claim 24 , wherein the bayonet ring comprises a plurality of retaining claws.

Assignees

• Wolf Hartmut
• Kautex Textron Gmbh & Co Kg

Inventors

• Wolf Hartmut

Classifications

• B60K15/04

  Tank inlets (B60K15/077 takes precedence) · CPC title

• B60K2015/03493

  made of plastics · CPC title

• B60K2015/03032

  Manufacturing of fuel tanks · CPC title

• B60K15/03177

  made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material (B60K15/03006 takes precedence) · CPC title

• B60K2015/0438

  using screw or bayonet · CPC title