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. 14, 2015
Filed:
May. 31, 2011
Nobuyoshi Yamashita, Kuwana, JP;
Hideaki Kubota, Kuwana, JP;
Natsuhiko Mori, Kuwana, JP;
Keiji Nagasaki, Awara, JP;
Masahiro Makino, Awara, JP;
Nobuyoshi Yamashita, Kuwana, JP;
Hideaki Kubota, Kuwana, JP;
Natsuhiko Mori, Kuwana, JP;
Keiji Nagasaki, Awara, JP;
Masahiro Makino, Awara, JP;
NTN Corporation, Osaka, JP;
Fukui Byora Co., Ltd., Fukui, JP;
Abstract
A shaft material integrally having a shaft portion and a flange portion is formed by a forging process. The end face of the shaft portion of the shaft material and the end face of the flange portion on the opposite side of the shaft portion are ground relative to the corrected face, and the outer circumferential surface of the shaft material is ground relative to the end faces. This renders the cylindricity of the radial bearing faces formed on the outer periphery of the shaft portion of the produced shaft member to be 3 μm or lower. Moreover, a shaft material integrally having the shaft portion and flange portion is formed, while simultaneously thrust hydrodynamic groove regions are formed on both end faces of the flange portion. After the forging process, radial hydrodynamic groove regions are formed on the outer circumferential surface of the shaft portion.