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:
Oct. 22, 2002
Filed:
Sep. 28, 1999
Yuzuru Suzuki, Shizuoka-ken, JP;
Naoyuki Harada, Shizuoka-ken, JP;
Taketoshi Ohyashiki, Shizuoka-ken, JP;
Minebea Co., Ltd., Nagano-Ken, JP;
Abstract
A high-quality bearing with improved controllability which is capable of performing a smooth movement with low vibration, low noise, and high rotation accuracy is provided stably in a short time and at low cost. Grooves of a desired configuration are provided in the outer circumferential surface of a mandrel having an outer diameter slightly smaller than the inner diameter of the metal bearing . The mandrel is inserted into the inner circumferential surface of the metal bearing . The metal bearing is inserted into a reducing jig or housing having an inner diameter slightly smaller than the outer diameter of the metal bearing , thereby causing plastic deformation of metal and forming desired ridges on the inner circumferential surface of the metal bearing . When the bearing has an outer diameter D and an inner diameter d, the reducing jig or housing has an inner diameter A, and the mandrel to be inserted into the inner circumferential surface of the bearing has a diameter B, the dimensional relationship between the individual components is established such that an interference ratio (D−A)/D is in the range of 0.005 to 0.035 and (d−B)/d is equal to or smaller than 0.005 provided that D>A and d>B are satisfied.