Fuel rail damper with locating features

Patent metadata

Field	Value
Publication number	US-10731611-B2
Application number	US-201816228899-A
Country	US
Kind code	B2
Filing date	Dec 21, 2018
Priority date	Dec 21, 2018
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A fuel injection system includes a fuel rail, and a damper that is disposed inside the fuel rail. The damper includes outwardly protruding first barbs formed integrally on one end of the damper and outwardly protruding second barbs formed integrally on an opposed end of the damper. The first barbs and the second barbs each engage the fuel rail inner surface, whereby the damper is located and retained within the fuel rail. The first barbs and the second barbs may be generally triangular in profile and each extend at an acute angle relative to the damper longitudinal axis. In addition, the first barbs and the second barbs are each oriented in the same direction relative to the longitudinal direction, whereby the damper is asymmetric when viewed in side view.

First claim

We claim:

1. A damper configured to be disposed inside a conduit,
the damper including
a first end;
a second end is opposed to the first end;
a mid portion that is hollow and is disposed between the first end and the second end;
a longitudinal axis that extends through the first end and the second end;
first retainers disposed on the first end; and
second retainers disposed on the second end,

wherein
the first retainers have the same structure as the second retainers, and are configured to retain the damper within the conduit,

and
the damper is asymmetric about an axis that is perpendicular to the longitudinal axis and that passes through a point mid way between the first end and the second end.

2. The damper of claim 1 , wherein
the first retainers include outwardly protruding triangular first barbs that are configured to engage an inner surface of the conduit,
the second retainers include outwardly protruding triangular second barbs that are configured to engage an inner surface of the conduit, and
the first barbs and the second barbs each extend at an acute, angle relative to the longitudinal axis, and the first barbs and the second barbs are each oriented in the same direction relative to the longitudinal direction.

3. The damper of claim 2 , wherein the first barbs, and the second barbs each comprise a generally triangular profile when viewed in a direction perpendicular to the longitudinal axis.

4. The damper of claim 2 , wherein the first barbs and the second barbs each comprise:
a base that is integral with a wall of the damper; and
a vertex that is spaced apart from the base and overlies the wall of the damper.

5. The damper of claim 2 , wherein
the mid portion has a first cross-sectional dimension,
the first end and the second end each have a corresponding second cross-sectional dimension that is greater than the first cross-sectional dimension, and
the first barbs and the second barbs each have a corresponding third cross-sectional dimension that is greater than the second cross-sectional dimension.

6. The damper of claim 2 , wherein
the first barbs comprise:
a first alpha barb; and
a first beta barb, the first alpha barb and the first beta barb being disposed between the first end and the mid portion, disposed on opposed sides of the damper, and aligned along a first axis that is perpendicular to the longitudinal axis, and

the second barbs comprise:
a second alpha barb; and
a second beta barb, the second alpha barb and the second beta barb being disposed between the second end and the mid portion, disposed on opposed sides of the damper, and aligned along a second axis that is perpendicular to the longitudinal axis.

7. The damper of claim 1 , wherein the first retainers are disposed between the first end and the mid portion, and the second retainers are disposed between the second end and the mid portion.

8. The damper of claim 1 , wherein the first end, the second end, the mid portion, the first retainers and the second retainers are integrally formed.

9. The damper of claim 1 , wherein
the mid portion has a closed sectional shape, as seen when the damper is viewed in a first cross section that is perpendicular to the longitudinal axis, where the first cross section is taken in the mid portion;
the first end includes a first plate portion, as seen when the damper is viewed in a second cross section that is perpendicular to the longitudinal axis, where the second cross section is taken between the first end and the mid portion, the first plate portion having first longitudinal edges that extend between the first end and the mid portion; and
the second end includes a second plate portion, as seen when the damper is viewed in a third cross section that is perpendicular to the longitudinal axis, where the third cross section is taken between the second end and the mid portion, the second plate portion having second longitudinal edges that extend between the second end and the mid portion,

and wherein
the first retainers protrude outwardly from the first longitudinal edges, and
the second retainers protrude outward from the second longitudinal edges.

10. The damper of claim 9 , wherein the damper comprises
a first weld that is disposed in the first plate portion and extends between the first longitudinal edges; and
a second weld that is disposed in the second plate portion and extends between the second longitudinal edges,

and wherein
the first retainers are disposed between the first end and the first weld, and
the second retainers are disposed between the second end and the second weld.

11. A fuel injection system comprising a fuel rail and a damper disposed inside the fuel rail,
the fuel rail having an inner surface;
the damper including
a first end;
a second end is opposed to the first end;
a mid portion that is hollow and is disposed between the first end and the second end,
a longitudinal axis that extends through the first end and the second end, and
an outer surface,

wherein
the first end includes outwardly protruding first barbs that engage the fuel rail inner surface,
the second end includes outwardly protruding second barbs that engage the fuel rail inner surface, and
the first barbs and the second barbs each extend at an acute angle relative to the longitudinal axis, and the first barbs and the second barbs are each oriented in the same direction relative to the longitudinal direction.

12. The damper of claim 11 , wherein the first barbs and the second barbs each comprise a generally triangular profile when viewed in a direction perpendicular to the longitudinal axis.

13. The damper of claim 11 , wherein the first barbs and the second barbs each comprise:
a base that is integral with a wall of the damper; and
a vertex that is spaced apart from the base and overlies the wall of the damper.

14. The damper of claim 11 , wherein the first barbs are disposed between the first end and the mid portion, and the second barbs are disposed between the second end and the midportion.

15. The damper of claim 11 , wherein the first end, the second end, the mid portion, the first barbs and the second barbs are integrally formed.

16. The damper of claim 11 , wherein
the mid portion has a first cross-sectional dimension,
the first end and the second end each have a corresponding second cross-sectional dimension that is greater than the first cross-sectional dimension, and
the first barbs and the second barbs each have a corresponding third cross-sectional dimension that is greater than the second cross-sectional dimension.

17. The damper of claim 11 , wherein
the first barbs comprise:
a first alpha barb; and
a first beta barb, the first alpha barb and the first beta barb being disposed between the first end and the mid portion, disposed on opposed sides of the damper, and aligned along a first axis that is perpendicular to the longitudinal axis, and

the second barbs comprise:
a second alpha barb; and
a second beta barb, the second alpha barb and the second beta barb being disposed between the second end and the mid portion, disposed on opposed sides of the damper, and aligned along a second axis that is perpendicular to the longitudinal axis.

18. The damper of claim 11 , wherein
the mid portion has a closed sectional shape, as seen when the damper is viewed in a first cross section that is perpendicular to the longitudinal axis, where the first cross section is taken in the mid portion;
the first end includes a first plate portion, a

Assignees

• Bosch Gmbh Robert
• Robert Bosch Llc

Inventors

• Guzman Escalante Alfonso Emmanuel
• Chavez Mendoza Josue Israel
• Casari John

Classifications

• F16F15/02

  Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems ({F16F15/005 takes precedence } ; layered products B32B; suppression of vibration in ships B63; {relieving load on bearings, using magnetic means F16C39/06}) · CPC title

• F16F9/0436

  characterised by being contained in a generally closed space · CPC title

• F02M2200/315

  for damping fuel pressure fluctuations · CPC title

• F02M2200/04

  Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion · CPC title

• F02M69/465

  of fuel rails · CPC title