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. 08, 2025
Filed:
Aug. 18, 2021
Ntn Corporation, Osaka, JP;
Shun Tamaki, Shizuoka, JP;
Masaaki Hayashi, Shizuoka, JP;
Sadayuki Kubota, Shizuoka, JP;
Tomoko Baba, Shizuoka, JP;
NTN CORPORATION, Osaka, JP;
Abstract
The rotational torque inspection method for a bearing device comprises: a press-fitting step (S); a first bearing preload value calculation step (S) for calculating a first bearing preload value (P); a post-press-fit rotational torque measurement step (S) for measuring a post-press-fit rotational torque (Ta); a crimping step (S) for crimping the small diameter step part to the inner ring; a post-crimping rotational torque measurement step (S) for measuring a post-crimping rotational torque (Tb); a second bearing preload value calculation step (S) for calculating a second bearing preload value (P); and a determination step (S) for determining the suitability of the preload depending on whether or not the second bearing preload value (P) is within a range of a reference value.