Fuel injector body with counterbore insert

Patent metadata

Field	Value
Publication number	US-11655787-B2
Application number	US-201916717222-A
Country	US
Kind code	B2
Filing date	Dec 17, 2019
Priority date	Jun 14, 2017
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

An insert for use with a fuel injector comprises a shaft including a substantially cylindrical configuration defining a shaft cylindrical axis, a shaft radial direction, and a shaft diameter; and a head including a substantially cylindrical configuration defining a head cylindrical axis, a head radial direction, and a head diameter. The shaft and head may be attached to each other, the shaft cylindrical axis and the head cylindrical axis may be parallel to each other, the head diameter may be greater than the shaft diameter, and the shaft cylindrical axis may be spaced away from the head cylindrical axis.

First claim

What is claimed is:

1. An insert for use with a fuel injector, the insert comprising:
a shaft including an at least partially cylindrical configuration defining a shaft cylindrical axis, a shaft radial direction, and a shaft diameter; and
a head including an at least partially cylindrical configuration defining a head cylindrical axis, a head radial direction, and a head diameter,
wherein the shaft and the head are attached to each other,
wherein the shaft cylindrical axis and the head cylindrical axis are parallel to each other,
wherein the head diameter is greater than the shaft diameter,
wherein the shaft cylindrical axis is spaced away from the head cylindrical axis,
wherein the head and the shaft are fixed in position relative to each other,
wherein the head and the shaft define axial extremities of the insert,
wherein the head includes an axial extremity defining a surface that also defines a head diameter,
wherein the head and the shaft define a thru-hole, and
wherein the thru-hole extends from the axial extremity and is configured to align with a bore of a fuel injector body, of the fuel injector, that extends to a piston receiving cavity.

2. The insert of claim 1 , wherein the shaft cylindrical axis is spaced away from the head cylindrical axis along either the shaft radial direction or the head radial direction, and
wherein the thru-hole defines a central axis that is oblique to the shaft cylindrical axis.

3. The insert of claim 1 , wherein the shaft cylindrical axis is spaced away from the head cylindrical axis along both the shaft radial direction and the head radial direction, and
wherein the thru-hole extends radially and longitudinally through the head and the shaft.

4. The insert of claim 1 , wherein the shaft cylindrical axis is spaced away from the head cylindrical axis by approximately 0.5 mm.

5. The insert of claim 1 , wherein the shaft defines a shaft longitudinal length and the head defines a head longitudinal length, and
wherein the shaft longitudinal length is greater than the head longitudinal length.

6. The insert of claim 5 , wherein the shaft diameter is approximately 4.5 mm,
wherein the head diameter is approximately 6.2 mm, the shaft longitudinal length is approximately 3.0 mm, and
wherein the head longitudinal length is approximately 1.4 mm.

7. A fuel injector assembly comprising:
a fuel injector component that defines a pressurized fuel chamber;
a check valve assembly in fluid communication with the pressurized fuel chamber;
a plunger disposed in the pressurized fuel chamber; and
a fuel injector body that includes a substantially cylindrical body defining a longitudinal axis, a radial direction, a first end along the longitudinal axis, a second end along the longitudinal axis, and a piston receiving cavity that extends longitudinally from the first end toward the second end terminating short thereof;
a counterbore extending longitudinally from the second end toward the first end and defining a large diameter cylindrical portion proximate the second end,
an intermediate diameter cylindrical portion extending longitudinally from the large diameter cylindrical portion toward the first end, and
a small diameter cylindrical portion extending longitudinally from the intermediate diameter cylindrical portion toward the first end; and

a first bore extending from the small diameter cylindrical portion to the piston receiving cavity and being aligned with a thru-hole that is defined by a head and a shaft of an insert and extends from an axial extremity of the head.

8. The fuel injector assembly of claim 7 , wherein the counterbore further defines a groove disposed longitudinally between the large diameter cylindrical portion and the intermediate diameter cylindrical portion.

9. The fuel injector assembly of claim 7 , wherein the first bore extends radially and longitudinally from the small diameter cylindrical portion to the piston receiving cavity.

10. The fuel injector assembly of claim 7 ,
wherein the large diameter cylindrical portion defines a first diameter and a first cylindrical axis,
wherein the intermediate diameter cylindrical portion defines a second diameter and a second cylindrical axis,
wherein the small diameter cylindrical portion defines a third diameter and a third cylindrical axis,
wherein the first cylindrical axis and second cylindrical axis are collinear, and
wherein the third cylindrical axis is spaced away from the first cylindrical axis and second cylindrical axis.

11. The fuel injector assembly of claim 10 ,
wherein the fuel injector body defines a second bore extending from the first end toward the second end, and
wherein a first minimum distance from the second bore to the intermediate diameter cylindrical portion of the counterbore is at least 0.5 mm, and
wherein a second minimum distance from the second bore to the small diameter cylindrical portion is at least 1 mm.

12. The fuel injector assembly of claim 11 ,
wherein the first diameter is approximately 6.4 mm,
wherein the second diameter is approximately 6.2 mm,
wherein the third diameter is approximately 4.5 mm,
wherein the intermediate diameter cylindrical portion defines a first longitudinal depth that is approximately 1.4 mm, and
wherein the small diameter cylindrical portion defines a second longitudinal depth that is approximately 3.0 mm.

13. The fuel injector assembly of claim 7 , wherein the insert is press fit into the intermediate diameter cylindrical portion and the small diameter cylindrical portion of the counterbore.

14. An insert for use with a fuel injector, the insert comprising:
a shaft including an at least partially cylindrical configuration defining a shaft cylindrical axis, a shaft radial direction, and a shaft diameter; and
a head including an at least partially cylindrical configuration defining a head cylindrical axis, a head radial direction, and a head diameter,
wherein the shaft extends from the head along the shaft cylindrical axis,
wherein the shaft cylindrical axis and the head cylindrical axis are parallel to each other,
wherein the head diameter is greater than the shaft diameter, and
wherein the shaft cylindrical axis is spaced away from the head cylindrical axis
wherein the head and the shaft define a thru-hole, and
wherein the thru-hole extends through an axial extremity of the head and is configured to align with a bore of a fuel injector body, of the fuel injector, that extends to a piston receiving cavity.

15. The insert of claim 14 , wherein the head and the shaft are unitary.

16. The insert of claim 14 , wherein the thru-hole is straight through an entirety of the insert.

17. The insert of claim 14 , wherein the thru-hole further extends through an axial extremity of the shaft.

18. The insert of claim 14 , wherein the thru-hole is a single aperture that extends through the insert.

19. The insert of claim 14 , wherein the shaft extends along a single axial direction from the head.

Assignees

• Caterpillar Inc

Inventors

• Caceres Diego

Classifications

• F02M63/0029

  using a pilot valve controlling a hydraulic chamber · CPC title

• F02M2200/8092

  adjusting or calibration · CPC title

• F02M45/00

  Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship {(pumps having such delivery by means of delivery valves F02M59/462)} · CPC title

• F02M61/042 Primary

  The valves being provided with fuel passages · CPC title

• F02M57/02

  Injectors structurally combined with fuel-injection pumps · CPC title