STEEL FUEL CONVEYING PIPE

• US 20130098496A1
• Filed: 07/05/2011
• Published: 04/25/2013
• Est. Priority Date: 07/23/2010
• Status: Active Grant

• Current Assignee: Usui Kokusai Sangyo Kaisha Limited
• Original Assignee: Usui Kokusai Sangyo Kaisha Limited
• Inventors: Takagi, Kazuo
• Granted Patent: US 9,012,031 B2
• Time in Patent Office: Days
• US Class Current: 138/143
• CPC Class Codes: F02M 2200/05 Fuel-injection apparatus having means for preventing corrosion
• CPC Class Codes: F02M 2200/9038 Coatings
• CPC Class Codes: F02M 55/02 Conduits between injection pumps and injectors , e.g. conduits between pump and common-rail or conduits between common-rail and injectors
• CPC Class Codes: F16L 58/08 by metal
• CPC Class Codes: F16L 9/02 of metal F16L9/16 - F16L9/22 take precedence
• CPC Class Codes: Y10T 428/12486 Laterally noncoextensive components [e.g., embedded, etc.]
• CPC Class Codes: Y10T 428/12799 Next to Fe-base component [e.g., galvanized]
• CPC Class Codes: Y10T 428/12937 Co- or Ni-base component next to Fe-base component

Abstract

To provide a steel fuel conveying pipe which has high resistance to corrosive fuel and maintains reliability without damaging a direct-injection engine, and connects a high-pressure pump and a direct-injection rail with each other in a gasoline direct-injection engine system, and a fuel conveying pipe suitable as a bypass pipe for coupling direct-injection rails with each other in a V-type gasoline engine. A steel fuel conveying pipe for conveying gasoline is characterized in that a Ni-plated layer is provided on the whole inner circumferential face of the fuel conveying pipe, and an anti-rust film layer composed of a Zn-plated layer and a Zn-based alloy-plated layer is further provided on the Ni-plated layer at at least one end of the fuel conveying pipe.

Claims

1. A steel fuel conveying pipe for conveying gasoline, comprising:

an inner circumferential surface, a Ni-plated layer provided on all of the inner circumferential face of the fuel conveying pipe, and an anti-rust film layer composed of a Zn-plated layer or a Zn-based alloy-plated layer provided on the Ni-plated layer at least at one end of the fuel conveying pipe.

4. The steel fuel conveying pipe of claim 1, wherein the anti-rust film layer has a thickness in a range of 0.1 to 8 μ

m, and when an inner diameter of the fuel conveying pipe is D mm, the anti-rust film layer is provided up to a position of D to 6D mm from the end of the fuel conveying pipe inward.

5. The steel fuel conveying pipe of claim 4, wherein the Ni-plated layer has a thickness in a range of 1 to 15 μ

m.

6. The steel fuel conveying pipe of claim 1, wherein at least a portion of an outer surface of the fuel conveying pipe is covered with a Zn-plated layer or a Zn-based alloy-plated layer.

7. The steel fuel conveying pipe of claim 1, wherein the fuel conveying pipe is a fuel conveying pipe which conveys gasoline from a high-pressure pump to a direct-injection rail in a gasoline direct-injection engine system.

8. The steel fuel conveying pipe of claim 1, wherein the fuel conveying pipe is a bypass pipe which couples direct-injection rails with each other in a V-type gasoline engine.

9. The steel fuel conveying pipe of claim 1, wherein the Ni-plated layer has a thickness in a range of 1 to 15 μ

m.

2. A steel fuel conveying pipe for conveying gasoline, comprising:

an inner circumferential surface, a Ni-plated layer provided on all of the inner circumferential face of the fuel conveying pipe, and an anti-rust film layer composed of a Zn-plated layer or a Zn-based alloy-plated layer provided on the Ni-plated layer at an end on a side of gasoline inflow in the fuel conveying pipe.

10. The steel fuel conveying pipe of claim 2, wherein the anti-rust film layer has a thickness in a range of 0.1 to 8 μ

m, and when an inner diameter of the fuel conveying pipe is D mm, the anti-rust film layer is provided up to a position of D to 6D mm from the end of the fuel conveying pipe inward.

12. The steel fuel conveying pipe of claim 2, wherein at least a portion of an outer surface of the fuel conveying pipe is covered with a Zn-plated layer or a Zn-based alloy-plated layer.

13. The steel fuel conveying pipe of claim 2, wherein the Ni-plated layer has a thickness in a range of 1 to 15 μ

m.

3. A steel fuel conveying pipe for conveying gasoline, comprising:

an inner circumferential surface, a Ni-plated layer provided on all of the inner circumferential face of the fuel conveying pipe, and an anti-rust film layer composed of a Zn-plated layer or a Zn-based alloy-plated layer provided on the Ni-plated layer at both ends on sides of gasoline inflow and gasoline outflow in the fuel conveying pipe.

14. The steel fuel conveying pipe of claim 3, wherein the anti-rust film layer has a thickness in a range of 0.1 to 8 μ

m, and when an inner diameter of the fuel conveying pipe is D mm, the anti-rust film layer is provided up to a position of D to 6D mm from the end of the fuel conveying pipe inward.

16. The steel fuel conveying pipe of claim 3, wherein at least a portion of an outer surface of the fuel conveying pipe is covered with a Zn-plated layer or a Zn-based alloy-plated layer.

17. The steel fuel conveying pipe of claim 3, wherein the Ni-plated layer has a thickness in a range of 1 to 15 μ

m.

11. (canceled)

15. (canceled)