The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 2004
Filed:
Jun. 26, 2002
Curt M. Barnhart, Indianapolis, IN (US);
Gary A. Foreman, Indianapolis, IN (US);
Dan N. Hamilton, Madison, IN (US);
Cleo E. Willhite, Seymour, IN (US);
Stephen C. Jackson, Commiskey, IN (US);
Angelina Y. Cheung, Enfield, CT (US);
Cummins Engine Company, Inc., Columbus, IN (US);
Abstract
According to the method of the present invention, the ball plug is press fit into the counterbored passage of a fuel injector nozzle assembly prior to hardening of the fuel injector nozzle assembly. A core hardening and gas nitriding process is then applied to the assembly, causing the ball plug to expand and the passage diameter to shrink. This results in a greatly increased seal between the ball plug and the passage, and substantial elimination of the gaps experienced therebetween in prior art fuel injector nozzle assemblies.