Fuel injector with non-metallic tip insulator
AssigneeCaterpillar Inc.
InventorRonald D. Shinogle
Life of this patent
Estimating the term…
Abstract
A fuel injector is provided which has an injector body with a metallic tip having an outer surface. A non-metallic insulator, such as a ceramic, is attached to the tip and covers a portion of the outer surface. Injector tip overheating can be a problem, especially during sustained two-cycle boosted engine compression release braking. In addition, injector tip overheating can be a problem when an engine is experiencing simultaneous engine compression release braking and exhaust braking.
Claims18
A fuel injector for use in an engine equipped with an engine compression release braking system, comprising:
- an injector body with a metallic tip defining a plurality of nozzle outlets and also having an outer surface;
- means for protecting said metallic tip from overheating from compression release braking, and said means including a non-metallic insulator attached at a contact with, and surrounding a portion of, said outer surface;
- and
- an outwardly directed centerline from each of said plurality of nozzle outlets does not intersect said insulator.
A method of reducing injector tip overheating due to engine compression release braking, comprising the steps of:
- performing engine compression release braking in a engine cylinder having a fuel injector partially positioned therein;
- providing said a fuel injector with a metallic tip having an outer surface;
- and
- attaching a non-metallic insulator to at a contact with, and surrounding a portion of, said outer surface, but not intersecting an outwardly directed centerline of each of a plurality of nozzle outlets.
Dependencies are inferred from the claim text.