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:
Aug. 25, 1998
Filed:
Jul. 31, 1997
Motoshi Kawamura, Nara-Ken, JP;
Masaru Goto, Yamatokoriyama, JP;
Koyo Seiko Co., Ltd., Chuo-Ku, JP;
Abstract
A wheel bearing device is provided in which the cutting amounts of end faces in a simultaneous process substantially balance with each other, so that a polishing process is facilitated and the tightening axial force of a nut can be stabilized. A wheel bearing device has an outer race which serves also as a housing; an inner race which serves also as a shaft; an inner race member which is fittingly fixed to the shaft which is the inner race; rolling elements and a cage which are disposed in an annular space between the outer race, and the inner race and the inner race member; and a nut which fixes the inner race member to the inner race by an axial force. In the wheel bearing device, the inner race member is formed so that the area of an end face abutting against a step portion of the shaft of the inner race is substantially equal to the area of an end face abutting against a bearing surface of the nut. The step portion is formed so that an outer peripheral end of the end face abutting against the bearing surface of the nut is positioned inside an end of the bearing surface of the nut.