Hydrodynamic bearing device

Abstract

A fluid dynamic bearing device 1 has a bearing sleeve 8, a shaft member 2 which is inserted in the inner periphery of the bearing sleeve, a housing 7 which is formed by pressing, has the bearing sleeve 8 press-fitted in the inner periphery thereof, and has a stepped section 7d which engages with the end surface of the bearing sleeve and is located ahead in the direction of press-fitting of the bearing sleeve 8, a thrust receiver 9 which is in contact with and supports an end of the shaft member 2, and a seal portion 10 which prevents oil from leaking from the inside of the housing. A dynamic pressure generating groove 8a1 for generating fluid dynamic pressure in a radial bearing gap between the outer peripheral surface of the shaft member 2 and the inner peripheral surface of the bearing sleeve 8 is formed in the inner peripheral surface of the bearing sleeve 8.

Description

technical field [0001] The present invention relates to a fluid dynamic pressure bearing device that rotatably supports a shaft member by utilizing fluid dynamic pressure formed in a bearing gap. Background technique [0002] Fluid dynamic pressure bearing devices have the characteristics of high-speed rotation, high rotation accuracy, and low noise. In recent years, these characteristics have been effectively utilized as bearing devices for electric motors mounted on various electrical equipment including information equipment. More specifically, , as spindle motors of magnetic disk devices such as HDD, optical disk devices such as CD-ROM, CD-R / RW, DVD-ROM / RAM, optical disk devices such as MD and MO, and polygon mirror scanner motors of laser beam printers (LBP) , Projector color wheel motors, fan motors and other motor bearing devices are used appropriately. [0003] like Figure 13 As shown, this fluid dynamic pressure bearing device includes: a bearing sleeve 108 made o...

AI Technical Summary

Problems solved by technology

In bonding and fixing, low-temperature drying treatment is required, or the positional relationship between the bearing sleeve and the housing needs to be maintained with a jig or the like until the adhesive is cured, so the bonding process becomes complicated and leads to high cost

In addition, when fixing by pressing only without adhesive fixing, it is necessary to obtain a large amount of pressing, which causes the same problem as that of metal cut molded products.

[0011] Since the flange portion is formed at one end of the shaft member, the bearing unit cannot be assembled (the inner circumference of the bearing sleeve cannot insert shaft member)

Therefore, when assembling, it is necessary to remove the flange-shaped member, and the assembling sequence is restricted.

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