Fuel injector with internal leak passage to injector drain
AssigneeCaterpillar Inc.
InventorsStephen Robert Lewis, Manjunath Bannur Nagaraja, Venkata R. Tatikonda, Adam Charles Hill
Life of this patent
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Abstract
A fuel injector body includes a body that includes an at least partially annular configuration defining a longitudinal axis, a circumferential direction, and a radial direction. A first counterbore and a first cavity extend from the first end toward the second end, and an external interface portion including a sealing surface is disposed axially between the first end and a shoulder. The first cavity defines a bottom surface and a peripheral surface, and the body also includes a leak passage extending from the bottom surface that is in communication with the first cavity.
Claims19
A fuel injector body for use with a fuel injector, the fuel injector body comprising:
- a body that includes an at least partially annular configuration defining a longitudinal axis, a circumferential direction, and a radial direction;
- a first end that is disposed axially along the longitudinal axis, and a second end that is disposed axially along the longitudinal axis;
- a first counterbore and a first cavity that extends from the first end toward the second end;
- and
- an external interface portion including a sealing surface that is disposed axially between the first end and a shoulder;
- wherein the first cavity defines a bottom surface and a peripheral surface, and the body further comprises a leak passage extending from the bottom surface that is in communication with the first cavity, and wherein the leak passage extends along a direction that is oblique to the radial direction and the longitudinal axis, and the fuel injector body further defines a supply passage that extends to the first cavity.
A fuel injector body for use with a fuel injector, the fuel injector body comprising:
- a body that includes an at least partially annular configuration defining a longitudinal axis, a circumferential direction, and a radial direction;
- a first end that is disposed axially along the longitudinal axis, and a second end that is disposed axially along the longitudinal axis;
- a first counterbore and a first cavity that extends from the first end toward the second end;
- and
- an external male attachment portion including a sealing surface that is disposed axially between the first end and a shoulder;
- wherein the first cavity defines a bottom surface and a peripheral surface, and the body further comprises a leak passage extending from the bottom surface, and the peripheral surface defines a cavity diameter, and the sealing surface defining a sealing surface diameter, and a ratio of the sealing surface diameter to the cavity diameter ranges from 0.3 to 4.4.
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;
- and
- a fuel injector body that includes
- an at least partially annular configuration defining a longitudinal axis, a circumferential direction, a radial direction, and a first end disposed along the longitudinal axis, a second end disposed along the longitudinal axis, and also defining a first counterbore, and a first cavity that extends longitudinally from the first end toward the second end terminating short thereof;
- and
- a nozzle that defines a first longitudinal end, and a second longitudinal end that is disposed longitudinally adjacent to the first end of the fuel injector body, and a second counterbore and a second cavity that extends longitudinally from the second longitudinal end toward the first longitudinal end;
- wherein the first end of the fuel injector body is disposed in the second counterbore and the second cavity of the nozzle, forming an interface region with the nozzle, and a seam between the fuel injector body and the nozzle, and the fuel injector body further defines a supply passage in communication with the pressurized fuel chamber, and a leak passage extending from the first cavity.
Dependencies are inferred from the claim text.