Fluid bearing device

Abstract

The present invention provides a fluid bearing device which has excellent moment rigidity and an improved working efficiency in assembling and parts control, and in which a bearing sleeve can be easily manufactured. A plurality of bearing sleeves are axially disposed in the fluid bearing device. The bearing sleeves (3, 4) are so formed that their axial lengths are different from each other.

Description

fluid bearing device technical field The invention relates to a fluid bearing device. Background technique In the fluid bearing device, the shaft member is rotatably supported by an oil film formed in a bearing gap. The fluid bearing has the characteristics of high-speed rotation, high rotation accuracy, and low noise. In recent years, its characteristics have been effectively used in information equipment such as HDD, FDD and other disk devices, CD-ROM, CD-R / RW, DVD-ROM / RAM It is widely used as a bearing for spindle motors on optical disc devices such as MD, MO, etc.; or as a bearing for fan motors mounted on personal computers (PCs) for heat source cooling. For example, in a fluid bearing device incorporated in a spindle motor of a disk drive device such as an HDD, both a radial bearing portion that supports the shaft member in the radial direction and a thrust bearing portion that supports the shaft member in the axial direction are sometimes composed of dynamic press...

AI Technical Summary

Problems solved by technology

Correspondingly, it is necessary to further process with high precision the inner peripheral surface of the bearing member forming the radial bearing gap and the outer peripheral surface of the shaft member. Difficult, in addition, there is a limit to improving machining accuracy in normal machining

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