US Patent 7942586 Thrust needle bearing

Patent 7942586 was granted and assigned to NTN Corporation on May, 2011 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

NTN Corporation

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

79425860

Patent Inventor Names

Kenji Tamada0

Hideyuki Tsutsui0

Date of Patent

May 17, 2011

Patent Application Number

105900100

Date Filed

November 19, 2004

Patent Primary Examiner

‌

Justin Krause

Patent abstract

In a thrust needle bearing employing lubricating oil and having rollers held by a cage and rolling on races, the value of the arithmetic average roughness Ra of roller is 0.03 to 0.15 μm. Even when the bearing is used under the conditions where lubrication is lean or lubrication characteristics are wrong, the rolls can be prevented from being worn at the contact parts thereof with the pocket guide face of the cage and the life of the rollers and races can be increased.