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:
May. 04, 1999
Filed:
Feb. 20, 1997
Dan K Hickey, Greenwood, IN (US);
J Victor Perr, Greenwood, IN (US);
David M Rix, Columbus, IN (US);
Joseph C Bentz, Columbus, IN (US);
Thomas M Yonushonis, Columbus, IN (US);
Malcolm G Naylor, Jonesville, IN (US);
Katsuhiro Shinosawa, Tokyo, JP;
John T Carroll, III, Columbus, IN (US);
Cummins Engine Company, Inc., Columbus, IN (US);
Abstract
A wear and scuff-resistant timing plunger for a timing assembly in a unit fuel injector for an internal combustion engine is provided. The timing plunger is formed of a high thermal expansion ceramic with a thermal expansion coefficient greater than 6.times.10.sup.-6 /.degree. C. and a hardness greater than 800 Kg/mm.sup.2, which maintains a desired diametral clearance and efficient plunger function without scuffing or sticking under the axial, tangential and pressure loads encountered in the fuel injector operating environment. Preferred high thermal expansion ceramics are zirconia, alumina-zirconia and alumina.