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:
Dec. 12, 1989
Filed:
Sep. 26, 1988
Gregory A Fett, Ft. Wayne, IN (US);
Dana Corporation, Toledo, OH (US);
Abstract
Initially, an uncut gear blank is softened by a heat treatment process to provide a relatively soft level of hardness throughout. Then, the softened gear blank is machined so as to form a plurality of teeth about the circumference thereof. The relatively soft machined gear is next subjected to a prehardening process, wherein the surfaces of the teeth and the outer region of the core are hardened to a predetermined intermediate level of hardness. Finally, the prehardened gear is subjected to a contour hardening process such that the surfaces of the gear teeth are further significantly hardened. The outer region of the core of the gear remains at the intermediate hardness level, while the inner region of the core remains at the relatively soft level.