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:
May. 01, 2007
Filed:
Feb. 04, 2004
Tomoyuki Yanagisawa, Kanagawa, JP;
Katsutoshi Matsuoka, Kanagawa, JP;
Ikunori Sakatani, Kanagawa, JP;
Shin Kumagai, Kanagawa, JP;
Tomoyuki Yanagisawa, Kanagawa, JP;
Katsutoshi Matsuoka, Kanagawa, JP;
Ikunori Sakatani, Kanagawa, JP;
Shin Kumagai, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
A revolution speed of ballsconstituting the outer side row is sensed by a revolution speed sensor. Also, a rotation speed of a hubis sensed by a rotation speed sensor. A speed ratio as a ratio between a revolution speed and the rotation speed is calculated based on a sensed signal of both sensors. When the axial load is changed and then the contact angles of the ballsare changed, the revolution speed is changed and in turn the speed ratio is changed. Therefore, the axial load is calculated based on a change of the speed ratio. Accordingly, the configurations that can be manufactured at a low cost and is able to sense the axial load applied between the huband the outer ringcan be realized.