High pressure common rail fuel pump outlet check valve spring retainer method

Patent metadata

Field	Value
Publication number	US-11149727-B2
Application number	US-201515571447-A
Country	US
Kind code	B2
Filing date	May 15, 2015
Priority date	May 15, 2015
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

The present disclosure generally relates to a pumping element of a fuel pump for an internal combustion engine wherein the pumping element comprises a first flow chamber; a second flow chamber in fluid connection with the first flow chamber, the second flow chamber including a shoulder; a check valve including a first insert and a second insert, the first insert being movable between a first position wherein the first insert forms a seal that inhibits fluid flow between the first and second flow chambers and a second position wherein the first insert permits fluid flow between the first and second flow chambers, the second insert being inserted into the second flow chamber to an extent limited by the shoulder; and a spring having a first end engaging the first insert and a second end engaging the second insert; wherein the first insert moves from the first position to the second position against a biasing force of the spring in response to pressurized fluid in the first flow chamber.

First claim

The invention claimed is:

1. A pumping element comprising:
a first flow chamber;
a second flow chamber in fluid connection with the first flow chamber, the second flow chamber including a shoulder;
a check valve including a first insert and a second insert, the first insert being disposed next to and apart from the second insert, the first insert being movable between a first position and a second position, wherein the first insert forms a seal that inhibits fluid flow between the first and second flow chambers when in the first position and the first insert permits fluid flow between the first and second flow chambers when in the second position, the second insert being inserted into the second flow chamber to an extent limited by the shoulder, wherein the second insert includes a shell and an insert inserted into the shell to cause expansion of the shell to retain the second insert in a fixed position within the second flow chamber; and
a spring having a first end engaging the first insert and a second end engaging the second insert, wherein the first insert moves from the first position to the second position against a biasing force of the spring in response to pressurized fluid in the first flow chamber.

2. The pumping element of claim 1 , wherein the first insert includes a proximal end, a distal end, and a central bore extending from the proximal end toward the distal end, and the second insert includes a proximal end, a distal end, and a central bore extending from the proximal end toward the distal end.

3. The pumping element of claim 2 , wherein the central bore of the first insert is engaged by the first end of the spring and the central bore of the second insert is engaged by the second end of the spring.

4. The pumping element of claim 1 , further comprising a third flow chamber in fluid connection with the first flow chamber when a stop element seals an exit of the second flow chamber, the first insert inhibiting fluid flow between the first flow chamber and the third flow chamber when in the first position and permitting fluid flow between the first flow chamber and the third flow chamber when in the second position.

5. The pumping element of claim 4 , wherein the first insert includes a passage providing a fluid flow path for pressurized fluid to flow from the first flow chamber to the second flow chamber or from the first flow chamber to the third flow chamber when the stop element seals the exit of the second flow chamber.

6. The pumping element of claim 1 , wherein the first and second inserts are disposed in the second flow chamber, and the second insert is retained in the fixed position by an interference fit provided by the shell and the insert.

7. The pumping element of claim 1 , wherein the shell includes an interior portion having an inner tapered surface and the insert includes an outer tapered surface, the inner and outer tapered surfaces cooperating to lock the insert within the shell.

8. The pumping element of claim 1 , wherein the spring biases the first insert away from the second insert into the first position in response to a pressure of fluid in the first flow chamber being below a predetermined threshold pressure.

9. A pumping element comprising:
a plunger disposed in a pumping chamber and reciprocally moveable along a longitudinal axis of the pumping chamber;
an inlet check valve disposed adjacent the pumping chamber to permit pressurized fluid to enter the pumping chamber;
a first flow chamber in fluid connection with the pumping chamber, the first flow chamber having a first section and a second section;
an outlet check valve disposed in the second section including at least a first insert and a second insert disposed adjacent a shoulder, the first insert being disposed next to and apart from the second insert, the first insert being movable between a first position and a second position, the second insert including a shell and an insert inserted into the shell to cause expansion of the shell to retain the second insert in a fixed position within the second section;
a spring disposed intermediate the first insert and the second insert, the spring providing a biasing force to bias the first insert to the first position to provide a seal between the first section and the second section; and
wherein the pressurized fluid causes the first insert to move to the second position against the biasing force of the spring in response to movement by the plunger toward the inlet check valve.

10. The pumping element of claim 9 , further comprising a second flow chamber in fluid connection with the first flow chamber, wherein pressurized fluid exits the pumping element through one of the first flow chamber or the second flow chamber.

11. The pumping element of claim 9 , wherein the shoulder provides a positional stop for the second insert such that an end section of the second insert abuts the shoulder and the second insert is retained in the fixed position by an interference fit provided by the shell and the insert.

12. The pumping element of claim 9 , wherein a central bore of the first insert guides a first end of the spring and a central bore of the second insert guides a second end of the spring.

Assignees

• Cummins Inc

Inventors

• Shaull Anthony A
• Rauznitz Tamas
• Watson Brian M
• Chasteen Patrick D
• Jones Luke Allen

Classifications

• F16K15/044

  spring-loaded · CPC title

• F02M59/464

  Inlet valves of the check valve type · CPC title

• F02M63/0042

  combined with valve seats of the lift valve type · CPC title

• F02M63/0054

  Check valves (F02M59/462, F02M59/464 take precedence) · CPC title

• F02M59/462 Primary

  Delivery valves · CPC title