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:
Mar. 18, 2003
Filed:
Dec. 20, 2001
Kazuo Okamura, Mie-ken, JP;
Yasuhiro Yamamoto, Kuwana, JP;
Isao Komori, Kuwana, JP;
Natsuhiko Mori, Mie-ken, JP;
Makoto Shiranami, Inazawa, JP;
NTN Corporation, Osaka-fu, JP;
Abstract
The porous oil-impregnated bearing comprises a bearing body made of a porous material, and oil retained in the pores of the bearing body by impregnation with lubricating oil or lubricating grease. The inner peripheral surface of the bearing body is formed with a bearing surface opposed to an outer peripheral surface of a shaft to be supported, with a bearing clearance defined therebetween. The bearing surface has a first region m in which a plurality of hydrodynamic pressure generating grooves inclined in one direction with respect to the axial direction are circumferentially disposed, a second region m which is axially spaced from said first region m and in which a plurality of hydrodynamic pressure generating grooves inclined in the other direction with respect to the axial direction are circumferentially disposed, and an annular smooth region n disposed between the first and second regions m and m