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:
Jul. 16, 2013
Filed:
Mar. 25, 2009
Hiroshi Morishita, Kuwana, JP;
Takashi Ito, Kuwana, JP;
Chikage Akai, Kuwana, JP;
Chikara Ohki, Kuwana, JP;
Kazuhiro Yagita, Kuwana, JP;
Hiroshi Morishita, Kuwana, JP;
Takashi Ito, Kuwana, JP;
Chikage Akai, Kuwana, JP;
Chikara Ohki, Kuwana, JP;
Kazuhiro Yagita, Kuwana, JP;
NTN Corporation, Osaka, JP;
Abstract
An outer ring and an inner ring of a rolling bearing are constituted of steel containing 0.77 to 0.85% of carbon, 0.01 to 0.25% of silicon, 0.01 to 0.35% of manganese, 0.01 to 0.15% of nickel, 3.75 to 4.25% of chromium, 4 to 4.5% of molybdenum and 0.9 to 1.1% of vanadium with the rest consisting of iron and impurities, a nitrogen-enriched layer having a nitrogen concentration of at least 0.05 mass % is formed on a region including a rolling surface, and the total of a carbon concentration and the nitrogen concentration in the nitrogen-enriched layer is at least 0.82 mass % and not more than 1.9 mass %. A DLC coating layer is arranged on a region including an outer ring contact surface.