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US 12,655,820 B2Granted
Fuel injector nozzle and fabrication method for the same
AssigneeCummins-Scania HPCR System, LLC
InventorsScott M. Biegert, Brian J. Wright, Darin Bartholomew
Life of this patent
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Abstract
A fuel injector and a nozzle for a fuel injector is provided. The nozzle is fabricated from a hardened nozzle body blank. The hardened nozzle body blank is machined to leave a hard wear resistant layer on the exterior surface of nozzle body blank. The nozzle includes at least one spray hole that is formed through the hard wear resistant layer on the exterior surface of the nozzle body blank.
Claims20
A nozzle for a fuel injector, the nozzle comprising:
- an elongated body extending along a longitudinal axis, the body extending along the longitudinal axis from a first end of the elongated body to an opposite second end of the elongated body, the elongated body including:
- an inner surface defining a longitudinally extending fuel passage, the fuel passage extending from the first end of the elongated body to the second end of the elongated body;
- an exterior surface at the second end of the elongated body, the exterior surface including a machined hard wear resistant layer formed thereon by machining a hardened nozzle body blank before any spray holes are formed through the hardened nozzle body blank;
- and
- at least one spray hole at the second end of the elongated body, the at least one spray hole being formed through the machined hard wear resistant layer formed on the exterior surface of the elongated body to extend from the exterior surface to the inner surface, wherein along the spray hole the elongated body has a first hardness at the exterior surface and a second hardness between the exterior surface and the inner surface, and the first hardness is greater than the second hardness.
2 more elements
A method for producing a fuel injection nozzle, the method comprising:
- hardening a nozzle body blank to include a hardened core and a hardened case that is harder than the hardened core, the nozzle body blank being hardened before forming of any spray holes through the nozzle body blank;
- machining the hardened case of the nozzle body blank to maintain a hard wear resistant layer on an exterior surface of the nozzle body blank;
- and
- forming at least one spray hole through the hard wear resistant layer on the exterior surface of the nozzle body blank after machining the hardened case.
1 more element
Dependencies are inferred from the claim text.