IP Library › Granted Patent US 7,263,975
Granted Patent B2
US 7,263,975 · App. 11/042,965 · Granted Sep 4, 2007

Plastic coated metal fuel rail

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Quick Facts
Patent No.
US 7,263,975
App. No.
11/042,965
Granted
Sep 4, 2007
Kind
B2
Abstract

An improved fuel rail for delivering fuel to a fuel injector for an internal combustion engine is provided that reduces the weight of the fuel injection system, greatly reduces manufacturing costs by eliminating expensive manufacturing methods, such as brazing, high heat welding, post plating, blow molding, and extrusion, and enhances low-cost, low-energy methods for attachment of fuel system components to the fuel rail. The improved fuel rail includes an tubular body defining a fluid chamber and having an inlet through which fuel enters the fluid chamber and a fuel injector port in fluid communication with the fluid chamber. The port is configured to receive the fuel injector. The tubular body is formed as a laminate having an inner metallic layer and an outer polymeric layer. The inner metallic layer may comprise aluminum and the outer polymeric layer may comprise nylon. Plastic or metal components can be attached to the laminated tubular body while providing a fluid tight, pressurized joint.

Claims (21)

1. A fuel rail for delivering fuel to a first fuel injector for an internal combustion engine, comprising:

a first tubular body defining a fluid chamber and having an inlet through which fuel enters said fluid chamber and a fuel injector port in fluid communication with said fluid chamber, said port configured to receive said first fuel injector

wherein said first tubular body is a laminate having an inner metallic layer and an outer polymeric layer

further comprising a fuel system component bonded to said outer layer of said first tubular body.

2. The fuel rail of claim 1 wherein said inner layer comprises aluminum.

3. The fuel rail of claim 2 wherein said outer layer comprises nylon.

4. The fuel rail of claim 1 wherein said outer layer comprises a plastic.

5. The fuel rail of claim 4 wherein said outer layer comprises nylon.

6. The fuel rail of claim 1 wherein said inner layer comprises steel.

7. The fuel rail of claim 1 wherein said outer layer is directly adjacent said inner layer.

8. The fuel rail of claim 1 wherein said outer layer is extruded over said inner layer.

9. The fuel rail of claim 1 , further comprising a second tubular body defining a fluid chamber and having an inlet through which fuel enters said fluid chamber of said second tubular body and a fuel injector port in fluid communication with said fluid chamber of said second tubular body, said port of said second tubular body configured to receive a second fuel injector.

10. The fuel rail of claim 1 wherein said first tubular body further includes another polymeric layer disposed inwardly of said inner metallic layer.

11. The fuel rail of claim 1 wherein said fuel system component is bonded to said outer layer of said first tubular body by generating heat transfer from said inner layer of said first tubular body to said outer layer of said first tubular body and deforming said outer layer of said first tubular body.

12. The fuel rail of claim 1 wherein said component comprises a pod configured to receive said first fuel injector.

13. The fuel rail of claim 1 wherein said component comprises a member with first and second pods, said first and second pods configured to receive said first fuel injector and a second fuel injector, respectively.

14. The fuel rail of claim 1 wherein said component comprises a bracket.

15. The fuel rail of claim 1 wherein said component comprises a cap disposed about an open end of said first tubular body.

16. The fuel rail of claim 1 further comprising a second tubular body defining a fluid chamber and having an inlet through which fuel enters said fluid chamber of said second tubular body and a fuel injector port in fluid communication with said fluid chamber of said second tubular body, said port of said second tubular body configured to receive a second fuel injector wherein said component comprises a cross-over tube in fluid communication with said fluid chamber of said first tubular body and said fluid chamber in said second tubular body.

17. The fuel rail of claim 1 further comprising a second tubular body defining a fluid chamber and having an inlet through which fuel enters said fluid chamber of said second tubular body and a fuel injector port in fluid communication with said fluid chamber of said second tubular body, said port of said second tubular body configured to receive a second fuel injector wherein said component comprises an inlet tube in fluid communication with said fluid chamber of said first tubular body and said fluid chamber of said second tubular body.

18. The fuel rail of claim 1 wherein said component comprises a bracket configured to secure said first tubular body to another fuel system component.