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. 28, 2013
Filed:
Nov. 21, 2007
Masashi Iguchi, Osaka, JP;
Masashi Iguchi, Osaka, JP;
Osaka Vacuum, Ltd., , JP;
Abstract
In a grease filled bearing for a machine such as a turbo molecular pump that rotates at high speed, objects are to prevent grease retained in an inner circumferential part of a ball retainer from being forced out to the outside of the bearing due to centrifugal force, thereby achieving extension of the operational life of the bearing, and preventing occurrence of rotational mass unbalance due to the grease forced out. A retainer () of a ball bearing includes a main body (A) having a circular annular shape, and plural circular pockets () for retaining balls () therein that extend through the main body (A) in a radial direction, wherein intermediate parts between adjacent pockets () in an inner circumferential surface of the main body (A) define recesses () for holding grease.