Fuel pump and damper cup thereof

Patent metadata

Field	Value
Publication number	US-12540608-B2
Application number	US-202117182307-A
Country	US
Kind code	B2
Filing date	Feb 23, 2021
Priority date	Feb 23, 2021
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

A damper cup houses a pulsation damper of a fuel pump such that the damper cup defines a fuel volume together with a fuel pump housing of the fuel pump. The damper cup includes a sidewall which is annular in shape and which extends along a damper cup axis from a sidewall first end to a sidewall second end. The damper cup also includes an end wall which closes the sidewall second end, wherein the sidewall includes a support shoulder which is transverse to the damper cup axis and which is a segment of an annulus extending uninterrupted about the damper cup axis from a shoulder first end to a shoulder second end such that the shoulder first end and the shoulder second end are separated from each other by a gap which is uninterrupted.

First claim

We claim:

1 . A fuel pump comprising:
a fuel pump housing with a pumping chamber defined therein; a pumping plunger which reciprocates within a plunger bore along a plunger bore axis such that an intake stroke of said pumping plunger increases volume of said pumping chamber and a compression stroke of said pumping plunger decreases volume of said pumping chamber; a damper cup which defines an internal fuel volume together with said fuel pump housing, said damper cup having a sidewall which is annular in shape and which extends along a damper cup axis from a sidewall first end to a sidewall second end, said damper cup also having an end wall which closes said sidewall second end, wherein said sidewall includes an interior support shoulder which is transverse to said damper cup axis and which has an inner surface that is one segment of an annulus extending about said damper cup axis from a shoulder inner surface first end to a shoulder inner surface second end such that said shoulder inner surface first end and said shoulder inner surface second end are separated from each other by a single gap, the inner surface of the interior support shoulder being within said fuel volume; and a pulsation damper located within said fuel volume and defining a damping volume which is fluidly segregated from said fuel volume, said pulsation damper having at least one damper wall which is flexible in response to pressure pulsations within said fuel volume, wherein an outer periphery of said pulsation damper is supported by the inner surface of said interior support shoulder.

2 . A fuel pump as in claim 1 , wherein said interior support shoulder extends around said damper cup axis for an angular distance of 270°±60°.

3 . A fuel pump as in claim 1 , wherein said damper cup includes an inlet fitting which is tubular and which provides a fuel inlet into said fuel volume, said inlet fitting being positioned through said sidewall such that said inlet fitting is positioned within said gap.

4 . A fuel pump as in claim 3 , wherein said inlet fitting is positioned between said sidewall first end and said sidewall second end to be aligned with said interior support shoulder.

5 . A fuel pump as in claim 1 , where said sidewall also includes an exterior shoulder which is transverse to said damper cup axis extending about said damper cup axis from an exterior shoulder first end to an exterior shoulder second end such that said exterior shoulder first end and said exterior shoulder second end are separated from each other by a cylindrical surface segment.

6 . A fuel pump as in claim 5 , wherein said exterior shoulder extends around said damper cup axis for an angular distance of 270°±60°.

7 . A fuel pump as in claim 5 , wherein said damper cup includes an inlet fitting which is tubular and which provides a fuel inlet into said fuel volume, said inlet fitting being positioned through said sidewall at said cylindrical surface segment.

8 . A fuel pump as in claim 7 , wherein said inlet fitting is positioned between said sidewall first end and said sidewall second end to be aligned with said exterior shoulder.

9 . A fuel pump as in claim 5 , wherein said exterior shoulder is axially aligned with said sidewall first end in a direction parallel to said damper cup axis.

10 . A damper cup for housing a pulsation damper of a fuel pump, wherein said damper cup defines an internal fuel volume together with a fuel pump housing of said fuel pump, said damper cup comprising:
a sidewall which is annular in shape and which extends along a damper cup axis from a sidewall first end to a sidewall second end; and an end wall which closes said sidewall second end, wherein said sidewall includes an interior support shoulder which is transverse to said damper cup axis and which is one segment of an annulus extending about said damper cup axis from a shoulder inner surface first end to a shoulder inner surface second end such that said shoulder inner surface first end and said shoulder inner surface second end are separated from each other by a single gap, the inner surface of the interior support shoulder being within said fuel volume.

11 . A damper cup as in claim 10 , wherein said interior support shoulder extends around said damper cup axis for an angular distance of 270°±60°.

12 . A damper cup as in claim 10 , wherein said damper cup includes an inlet fitting which is tubular and which provides a fuel inlet into said fuel volume, said inlet fitting being positioned through said sidewall such that said inlet fitting is positioned within said gap.

13 . A damper cup as in claim 12 , wherein said inlet fitting is positioned axially along said damper cup axis between said sidewall first end and said sidewall second end to be aligned with said interior support shoulder.

14 . A damper cup as in claim 10 , where said sidewall also includes an exterior shoulder which is transverse to said damper cup axis extending about said damper cup axis from an exterior shoulder first end to an exterior shoulder second end such that said exterior shoulder first end and said exterior shoulder second end are separated from each other by a cylindrical surface segment.

15 . A damper cup as in claim 14 , wherein said exterior shoulder extends around said damper cup axis for an angular distance of 270°±60°.

16 . A damper cup in claim 14 , wherein said damper cup includes an inlet fitting which is tubular and which provides a fuel inlet into said fuel volume, said inlet fitting being positioned through said sidewall at said cylindrical surface segment.

17 . A damper cup as in claim 16 , wherein said inlet fitting is positioned between said sidewall first end and said sidewall second end to be aligned with said exterior shoulder.

18 . A damper cup as in claim 14 , wherein said exterior shoulder is axially aligned with said sidewall first end in a direction parallel to said damper cup axis.

19 . A fuel pump comprising:
a fuel pump housing with a pumping chamber defined therein; a pumping plunger which reciprocates within a plunger bore along a plunger bore axis such that an intake stroke of said pumping plunger increases volume of said pumping chamber and a compression stroke of said pumping plunger decreases volume of said pumping chamber; a damper cup which defines an internal fuel volume together with said fuel pump housing, said damper cup having a sidewall which is annular in shape and which extends along a damper cup axis from a sidewall first end to a sidewall second end, said damper cup also having an end wall which closes said sidewall second end, wherein said sidewall includes an interior support shoulder which is transverse to said damper cup axis and which has an inner surface that extends about said damper cup axis from a shoulder inner surface first end to a shoulder inner surface second end such that said shoulder inner surface first end and said shoulder inner surface second end are separated from each other by a single gap which extends from said shoulder inner surface first end to said shoulder inner surface second end; and a pulsation damper located within said fuel volume and defining a damping volume which is fluidly segregated from said fuel volume, said pulsation damper having at least one damper wall which is flexible in response to pressure pulsations within said fuel volume, wherein an outer periphery of said pulsation damper is supported by the inner surface of said interior support shoulder.

20 . A fuel pump as in claim 19 , wherein a sum

Assignees

• Delphi Tech Ip Ltd
• Phinia Jersey Holdings Llc

Inventors

• Uckermark Chad E
• Kazour Youssef
• Grein John R

Classifications

• F02B33/28

  Component parts, details or accessories of crankcase pumps, not provided for in, or of interest apart from, subgroups F02B33/02 - F02B33/26 · CPC title

• F04B39/0027 Primary

  Pulsation and noise damping means · CPC title

• F02M2200/315

  for damping fuel pressure fluctuations · CPC title

• F02M59/48

  Assembling; Disassembling; Replacing · CPC title

• F02M55/04 Primary

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