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    • 9. 发明申请
    • FLUID DYNAMIC BEARING DEVICE AND STORAGE DISK DRIVING DEVICE USING THE SAME
    • 流体动力轴承装置和存储盘驱动装置
    • US20080075398A1
    • 2008-03-27
    • US11859988
    • 2007-09-24
    • Akihiro KIMURAKunio SAKURADA
    • Akihiro KIMURAKunio SAKURADA
    • F16C32/06G11B17/00
    • A fluid dynamic bearing device includes a shaft and a sleeve, with the shaft or the sleeve having a greater hardness being smoothed to have about 0.02 μm or less of the arithmetical average of the surface roughness. The hardness of the shaft or the sleeve having a greater hardness is a Vickers hardness of about 100 Hv or greater at a portion that is arranged to come into contact with the other of the shaft or the sleeve. Further, the hardness of the other of the shaft or the sleeve is a Vickers hardness of about 600 HV or smaller at a portion arranged to come into contact with the shaft or the sleeve having a greater hardness. A clearance of a radial gap defined between the shaft and the sleeve S is about 1.3 μm to about 2.5 μm. Other gaps defining the fluid dynamic bearing portion are configured such that the rotor hub (or the thrust plate) and the sleeve do not come into contact with each other at a thrust dynamic bearing portion when the shaft is slanted as much as possible relative to the sleeve in a state that the rotor is lifted to a rated flying height.
    • 流体动力轴承装置包括轴和套筒,其中所述轴或套筒具有更大的硬度被平滑以具有约0.02mum或更小的表面粗糙度的算术平均值。 具有较大硬度的轴或套筒的硬度在设置成与轴或套筒中的另一个接触的部分处的维氏硬度为约100Hv或更高。 此外,轴或套筒中的另一个的硬度在布置成与具有较大硬度的轴或套筒接触的部分处的维氏硬度为约600HV或更小。 限定在轴和套筒S之间的径向间隙的间隙为约1.3μm至约2.5μm。 限定流体动力轴承部分的其它间隙被构造成使得当轴尽可能相对于轴向部分倾斜时,转子轮毂(或推力板)和套筒在推力动态轴承部分处不彼此接触 套筒处于转子升高到额定飞行高度的状态。