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. 27, 2008
Filed:
Apr. 10, 2003
Joseph Traywick Griffin, Charlotte, NC (US);
Marion Jack Ince, Mount Holly, NC (US);
Charles M. Schwab, Fort Mill, SC (US);
Eric S. Nelson, Charlotte, NC (US);
Richard S. Carpenter, Rock Hill, SC (US);
Joseph Traywick Griffin, Charlotte, NC (US);
Marion Jack Ince, Mount Holly, NC (US);
Charles M. Schwab, Fort Mill, SC (US);
Eric S. Nelson, Charlotte, NC (US);
Richard S. Carpenter, Rock Hill, SC (US);
INA Schaeffler KG, Herzogenaurach, DE;
Abstract
The invention concerns the fixing of a bearing shaft () in a reception bore () of a housing, at least one end of the shaft being adapted to be swaged to the reception bore () for achieving at least one of a force locking and a positive engagement, and an outer peripheral surface of the shaft () having a hardness that is greater than a hardness of the ends () of the shaft. The novel shaft is carbonitrided, quenched and tempered so that at first a hardness of HV 745-950 (HRC 62-68) is realized, following which the thus treated shaft () is soft annealed to produce a hardness of HV 212-305 (HRB 93-HRC30), and the outer peripheral surface is then subjected to induction hardening to achieve a final hardness of HV 745-950 (HRC 62-68). The shaft of the invention has a long operating life even under high load conditions.