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. 01, 2001
Filed:
Sep. 14, 1999
Hisashi Ohtsuki, Shizuoka, JP;
Shinji Nishio, Shizuoka, JP;
NTN Corporation, Osaka, JP;
Abstract
A wheel bearing device is proposed which maintains long life even under high-load, high-temperature conditions. On the surfaces of inner rings and tapered rollers of a multiple-row tapered roller bearing rotatably supporting a wheel, carburized, nitrided layers are formed which contain 0.80 wt % or more carbon and have a Rockwell hardness of 58 or over with the residual aaustenite content being 25-35 vol % to improve mechanical properties and fatigue characteristics of these parts and also keep the surface layers of these parts of suitable toughness, thereby improving the life of the wheel bearing device in a high-load, high-temperature environment. Also, an annular recess is formed in the inner periphery of the outer ring at a portion between the rows of the raceways.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile