US Patent 7237963 Rolling part and power transmission part

Patent 7237963 was granted and assigned to NTN Corporation on July, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

NTN Corporation

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

72379630

Patent Inventor Names

Yukio Matsubara0

Kikuo Maeda0

Date of Patent

July 3, 2007

Patent Application Number

105153140

Date Filed

May 19, 2003

Patent Primary Examiner

‌

Lenard A. Footland

Patent abstract

There is provided a rolling component formed of a steel material of the medium carbon steel level that provides a rolling life improved to be comparable to that of bearing steel and also provides improved characteristic against surface-cracking, and a power transmission component including the rolling component. To achieve this, the rolling component is formed of steel having an induction hardened portion having a stress intensity factor range associated with tension associated-fatigue crack extension that has a lower limit ΔKth of 6.2 Mpa√m.