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:
Jul. 14, 2009
Filed:
Dec. 22, 2006
Katsutoshi Nii, Matsudo, JP;
Hideo Shikata, Matsudo, JP;
Katsutoshi Nii, Matsudo, JP;
Hideo Shikata, Matsudo, JP;
Hitachi Powdered Metals Co., Ltd., Matsudo-shi, JP;
Abstract
A fluid dynamic pressure effect can be sufficient without receiving a large effect of viscous friction of lubricating oil with changes in the environmental temperature in which it is used, and smooth starting of the rotating shaft can be ensured by regulating the gap between the rotating shaft and bearing within a suitable range. An outer diameter of the bearing, D, a length in an axial direction of the bearing, L, a gap at a radial side which is between the rotating shaft and the bearing, C, and an inclining height of the bearing end surface to which the flange is faced, δ, satisfy the expression L/D<C/δ. It is preferable that the inclining height, δ, be 2 to 6 μm, the inner diameter of the bearing be 1 to 3 μm, and the gap at a radial side, C, be 1 to 4 μm.