Fuel rail with pressure pulsation damper

Patent metadata

Field	Value
Publication number	US-9518544-B2
Application number	US-201313847068-A
Country	US
Kind code	B2
Filing date	Mar 19, 2013
Priority date	Mar 19, 2013
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A fuel rail assembly includes a hollow fuel rail extending along a fuel rail axis and includes at least one outlet for dispensing fuel from the fuel rail. A fuel rail damper is disposed within the fuel rail and extends along a fuel rail axis from a first fuel rail damper end to a second fuel rail damper end for damping pressure pulsations within the fuel rail. A fuel rail damper support is included for positioning the fuel rail damper within the fuel rail. The fuel rail damper support includes an attachment section for fixing the fuel rail damper support to the fuel rail damper and a biasing section that applies a biasing force to prevent axial movement of the fuel rail damper within the fuel rail.

First claim

We claim:

1. A fuel rail assembly for supplying fuel to at least one fuel injector, said fuel rail assembly comprising:
a hollow fuel rail extending along a fuel rail axis, said fuel rail having a first fuel rail end disposed along said fuel rail axis, a second fuel rail end disposed along said fuel rail axis, an inlet for introducing fuel into said fuel rail, and at least one outlet for dispensing fuel from said fuel rail;
a first end cap closing off said first fuel rail end;
a second end cap closing off said second fuel rail end;
a fuel rail damper disposed within said fuel rail between said first end cap and said second end cap and extending along a fuel rail damper axis from a first fuel rail damper end to a second fuel rail damper end for damping pressure pulsations within said fuel rail; and
a fuel rail damper support for positioning said fuel rail damper within said fuel rail, wherein said fuel rail damper support comprises:
an attachment section for fixing said fuel rail damper support to said fuel rail damper;
a biasing section that applies a biasing force to said first end cap to urge said fuel rail damper axially away from said first end cap and to prevent movement of said fuel rail damper along said fuel rail damper axis within the fuel rail;
a fuel rail damper support base wherein said attachment section extends from said fuel rail damper support base; and
a positioning arm extending from said fuel rail damper support base, said positioning arm including a locating surface which abuts said first fuel rail damper end such that said first fuel rail damper end is an endmost distal section of said fuel rail damper.

2. A fuel rail assembly as in claim 1 wherein said biasing section is held in compression.

3. A fuel rail assembly as in claim 1 wherein said attachment section includes a pair of opposing clamping arms such that each of said clamping arms radially surrounds a portion of said fuel rail damper.

4. A fuel rail assembly as in claim 3 wherein said clamping arms apply a force radially inward on said fuel rail damper.

5. A fuel rail assembly as in claim 3 wherein each of said clamping arms includes a portion contoured to substantially match a portion of the outer perimeter of said fuel rail.

6. A fuel rail assembly as in claim 1 wherein said positioning arm is inclined to said fuel rail damper axis.

7. A fuel rail assembly as in claim 1 wherein said positioning arm includes two segments that define said locating surface.

8. A fuel rail assembly as in claim 7 wherein said two segments are inclined in opposite directions relative to said fuel rail damper axis.

9. A fuel rail assembly as in claim 1 wherein said biasing section extends from said positioning arm.

10. A fuel rail assembly as in claim 9 wherein said biasing section is J-shaped.

11. A fuel rail assembly comprising:
a hollow fuel rail extending along a fuel rail axis, said fuel rail having a first fuel rail end disposed along said fuel rail axis, a second fuel rail end disposed along said fuel rail axis, an inlet for introducing fuel into said fuel rail, and a plurality of outlets for dispensing fuel from said fuel rail;
a first end cap closing off said first fuel rail end;
a second end cap closing off said second fuel rail end;
a fuel rail damper disposed within said fuel rail between said first end cap and said second end cap and extending along a fuel rail damper axis from a first fuel rail damper end to a second fuel rail damper end for damping pressure pulsations within said fuel rail; and
a first fuel rail damper support and a second fuel rail damper support for positioning said fuel rail damper within said fuel rail, wherein said first fuel rail damper support and said second fuel rail damper support each comprise:
an attachment section for fixing said fuel rail damper support to said fuel rail damper;
a biasing section;
a fuel rail damper support base wherein said attachment section extends from said fuel rail damper support base; and
a positioning arm extending from said fuel rail damper support base, said positioning arm including a locating surface, wherein said locating surface of said first fuel rail damper support abuts said first fuel rail damper end and said locating surface of said second fuel rail damper support abuts said second fuel rail damper end such that said first fuel rail damper end is a first endmost distal section of said fuel rail damper and such that said second fuel rail damper end is a second endmost distal section of said fuel rail damper;
wherein said biasing section of said first fuel rail damper support applies a biasing force to urge said fuel rail damper axially away from said first end cap and wherein said biasing section of said second fuel rail damper support applies a biasing force to urge said fuel rail damper axially away from said second end cap, thereby preventing movement of said fuel rail damper along said fuel rail damper axis within said fuel rail.

12. A fuel rail assembly as in claim 11 wherein said biasing section of said first fuel rail damper support is held in compression and wherein said biasing section of said second fuel rail damper support is held in compression.

13. A fuel rail assembly as in claim 11 wherein said attachment section includes a pair of opposing clamping arms such that each of said clamping arms radially surrounds a portion of said fuel rail damper.

14. A fuel rail assembly as in claim 13 wherein said clamping arms apply a force radially inward on said fuel rail damper.

15. A fuel rail assembly as in claim 13 wherein each of said clamping arms includes a portion contoured to substantially match a portion of the outer perimeter of said fuel rail.

16. A fuel rail assembly as in claim 11 wherein said positioning arm is inclined to said fuel rail damper axis.

17. A fuel rail assembly as in claim 11 wherein said positioning arm includes two segments that define said locating surface.

18. A fuel rail assembly as in claim 17 wherein said two segments are inclined in opposite directions relative to said fuel rail damper axis.

19. A fuel rail assembly as in claim 11 wherein said biasing section extends from said positioning arm.

20. A fuel rail assembly as in claim 19 wherein said biasing section is J-shaped.

21. A fuel rail assembly for supplying fuel to at least one fuel injector, said fuel rail assembly comprising:
a hollow fuel rail extending along a fuel rail axis, said fuel rail having a first fuel rail end disposed along said fuel rail axis, a second fuel rail end disposed along said fuel rail axis, an inlet for introducing fuel into said fuel rail, and at least one outlet for dispensing fuel from said fuel rail;
a first end cap closing off said first fuel rail end;
a second end cap closing off said second fuel rail end;
a fuel rail damper disposed within said fuel rail between said first end cap and said second end cap and extending along a fuel rail damper axis from a first fuel rail damper end to a second fuel rail damper end for damping pressure pulsations within said fuel rail; and
a fuel rail damper support for positioning said fuel rail damper within said fuel rail, wherein said fuel rail damper support comprises:
an attachment section for fixing said fuel rail damper support to said fuel rail damper;
a biasing section that applies a biasing force to said first end cap to urge said fuel rail damper axially away from said first end cap and to prevent movement of said fuel rail damper along said fuel rail

Assignees

• Delphi Tech Inc

Inventors

• Bartell Peter E
• Merkov Robert

Classifications

• F02M37/0017

  related to fuel pipes or their connections, e.g. joints or sealings (F02M55/004 takes precedence) · CPC title

• F02M55/04

  Means for damping vibrations {or pressure fluctuations} in injection pump inlets {or outlets} · CPC title

• F02M55/025 Primary

  Common rails · CPC title

• F02M69/465

  of fuel rails · CPC title

• F02M37/0041

  Means for damping pressure pulsations (equalisation of pulses in positive displacement pumps F04B1/00; devices for damping fluid pulsations in pipes F16L55/04) · CPC title