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:
Apr. 17, 2001
Filed:
Aug. 30, 1999
Shinji Abe, Ikoma-Gun, JP;
Masahiro Mukasa, Nara, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
A rolling bearing comprises an inner ring, an outer ring and a plurality of rolling elements therebetween, and is used, for example, in a spindle motor for driving a hard disk. The inner ring is made of, for example, high-carbon chromium steel, the outer ring is made of, for example, stainless steel, and each rolling element is made of ceramics, for example zirconia, of which coefficient of linear expansion is in the range of 7×10,/° C. to 15×10,/° C. The bearing rings and the rolling elements are substantially equal to each other in coefficient of linear expansion. Thus, the change in pre-load due to temperature variations is small.