Fuel pump and outlet valve seat thereof

Patent metadata

Field	Value
Publication number	US-10907600-B1
Application number	US-201916715696-A
Country	US
Kind code	B1
Filing date	Dec 16, 2019
Priority date	Dec 16, 2019
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A fuel pump includes a fuel pump housing with a pumping chamber and an outlet valve bore extending along an outlet valve bore axis; a pumping plunger which reciprocates within a plunger bore along a plunger bore axis which is traverse to the outlet valve bore axis; and an outlet valve assembly. The outlet valve assembly includes an outlet valve seat with an outlet flow passage, wherein a first portion of the outlet valve seat is aligned with the pumping plunger in a direction parallel to the plunger bore axis and wherein a second portion of the outlet valve seat is not aligned with the pumping plunger in a direction parallel to the plunger bore axis and an outlet valve member which is moveable between an unseated position which provides fluid communication through the outlet flow passage and a seated position which prevents fluid communication through the outlet flow passage.

First claim

I claim:

1. A fuel pump comprising:
a fuel pump housing with a pumping chamber defined therein, said fuel pump housing having an outlet valve bore, said outlet valve bore extending along, and being centered about, an outlet valve bore axis;
a pumping plunger which reciprocates within a plunger bore along a plunger bore axis which is traverse to said outlet valve 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; and
an outlet valve assembly comprising:
an outlet valve seat with an outlet valve seat flow passage extending therethrough, wherein a first portion of said outlet valve seat is aligned with said pumping plunger in a direction parallel to said plunger bore axis and wherein a second portion of said outlet valve seat is not aligned with said pumping plunger in a direction parallel to said plunger bore axis; and
an outlet valve member which is moveable between 1) an unseated position which provides fluid communication through said outlet valve seat flow passage and 2) a seated position which prevents fluid communication through said outlet valve seat flow passage.

2. A fuel pump as in claim 1 , wherein said outlet valve seat extends along said outlet valve bore axis from an outlet valve seat first end which is within said pumping chamber to an outlet valve seat second end which is outside of said pumping chamber.

3. A fuel pump as in claim 2 , wherein:
said outlet valve seat includes an outlet valve seat slot extending thereinto;
said pumping plunger reciprocates between a top dead center position in which volume of said pumping chamber is minimized to a bottom dead center position in which volume of said pumping chamber is maximized; and
a portion of said pumping plunger is located within said outlet valve seat slot when said pumping plunger is in said top dead center position.

4. A fuel pump as in claim 3 , wherein said outlet valve seat slot extends into said outlet valve seat from said outlet valve seat first end.

5. A fuel pump as in claim 3 , wherein said outlet valve seat slot intersects with said outlet valve seat flow passage.

6. A fuel pump as in claim 3 , wherein said outlet valve seat slot is delimited in a direction parallel to said plunger bore axis by an outlet valve seat slot top wall which is traverse to said plunger bore axis.

7. A fuel pump as in claim 6 , wherein said outlet valve seat slot top wall is perpendicular to said plunger bore axis.

8. A fuel pump as in claim 6 , wherein said outlet valve seat slot top wall is bifurcated by said outlet valve seat flow passage.

9. A fuel pump as in claim 6 , wherein said outlet valve seat includes a pair of outlet valve seat sidewalls which face toward teach other.

10. A fuel pump as in claim 9 , wherein said outlet valve seat sidewalls are parallel to each other and parallel to said plunger bore axis.

11. A fuel pump as in claim 1 , wherein:
wherein said outlet valve seat extends along said outlet valve bore axis from an outlet valve seat first end which is within said pumping chamber to an outlet valve seat second end which is outside of said pumping chamber;
said fuel pump further comprises an outlet fitting which is down stream of said outlet valve seat;
an outlet valve seat pressure relief passage is formed axially between said outlet valve seat second end and said outlet fitting;
said fuel pump housing includes a fuel pump housing pressure relief passage which initiates at a radial location at a radial location of said outlet valve bore that is aligned with said outlet valve seat pressure relief passage and terminates in said pumping chamber; and
said fuel pump includes a pressure relief valve assembly located in said fuel pump housing pressure relief passage such that said pressure relief valve assembly allows fuel to flow into said pumping chamber through said fuel pump housing pressure relief passage and such that said pressure relief valve assembly prevents fuel from flowing out of said pumping chamber through said fuel pump housing pressure relief passage.

12. A fuel pump as in claim 11 , wherein said outlet valve seat pressure relief passage extends axially into said outlet valve seat second end.

13. A fuel pump as in claim 11 , wherein said outlet valve assembly further comprises an outlet valve spring which is grounded against said outlet fitting and biases said outlet valve member toward said seated position.

Assignees

• Delphi Tech Ip Ltd

Inventors

• Uckermark Chad E

Classifications

• F02M59/462 Primary

  Delivery valves · CPC title

• F02M59/44

  Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} · CPC title

• F02M59/102

  Mechanical drive, e.g. tappets or cams (F02M45/063 takes precedence) · CPC title

• F02M2200/315

  for damping fuel pressure fluctuations · CPC title

• F02M63/0225

  Fuel-injection apparatus having a common rail feeding several injectors (F02M63/0003 takes precedence); Means for varying pressure in common rails; Pumps feeding common rails · CPC title