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:
Dec. 08, 2015
Filed:
Dec. 07, 2012
Takashi Ueno, Iwata, JP;
Chikara Ohki, Kuwana, JP;
Daisuke Sato, Kuwana, JP;
Kyouhei Kageyama, Utsunomiya, JP;
Shougo Shimizu, Iwata, JP;
Takashi Ueno, Iwata, JP;
Chikara Ohki, Kuwana, JP;
Daisuke Sato, Kuwana, JP;
Kyouhei Kageyama, Utsunomiya, JP;
Shougo Shimizu, Iwata, JP;
NTN CORPORATION, Osaka, JP;
Abstract
An outer ring, an inner ring, and a ball, each of which is a bearing part, are made of a quench-hardened steel containing not less than 0.90 mass % and not more than 1.05 mass % of carbon, not less than 0.15 mass % and not more than 0.35 mass % of silicon, not less than 0.01 mass % and not more than 0.50 mass % of manganese, and not less than 1.30 mass % and not more than 1.65 mass % of chromium with the rest consisting of an impurity. A contact surface thereof with another part has a nitrogen concentration of not less than 0.25 mass %. A remaining austenite amount in the contact surface is not less than 6 volume % and not more than 12 volume %.