A Comparison Study on the Characteristics of Five Types of Hydrodynamic Oil Bearings for Hard Disk Spindles

Ono, Kyosuke; Zhu, Jiasheng; Cui, Changzhi

doi:10.1142/9789812815903_0003

Cited by 2 publications

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“…In these applications, manufacturing cost and power consumption are the main concerns to both HDD makers and consumers. Therefore, multi-taper bearings, which have a higher stiffness to friction ratio (Ono et al 1998) and lower manufacturing costs than herringbone groove bearings, are once again finding applications in the spindle motors of HDDs and other date storage systems. But the friction and wear characteristics of these two kinds of journal bearings during startup and shutdown (S/S) are still not well clarified, especially under HDD operation conditions.…”

Section: Introductionmentioning

confidence: 99%

Friction and wear of spindle motor hydrodynamic bearings for information storage systems during startup and shutdown

Feng¹,

Kenjō²

2006

Microsyst Technol

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This paper investigates the friction and wear characteristics of two typical hydrodynamic bearings for hard disk drive (HDD) spindle motors (SPM), i.e., the herringbone groove and multi-taper bearings, during start-up and shut-down transient operation. The friction characteristics are calculated by a lubricated friction model which is an extension of Kogut and Etsion's dry friction model (a modified version of the CEB model), while the wear characteristics are qualitatively evaluated in non-dimensional form by the semi-analytical wear model proposed by Holm-Archard. The average flow Reynolds equation and the pressure-compliance relationship of elasticplastic roughness contact are used together to consider the combined effects of partial lubrication and asperity contact occurring during start-up and shut-down. Then, the friction and wear characteristics of the herringbone groove and multi-taper bearings are calculated and compared under the condition of HDD application.

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Section: Introductionmentioning

confidence: 99%

Friction and wear of spindle motor hydrodynamic bearings for information storage systems during startup and shutdown

Feng¹,

Kenjō²

2006

Microsyst Technol

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“…A ball bearing is low in cost but has weak points in terms of non-repeatable run out, vibration, noise and poor durability to external shocks compared with a hydrodynamic bearing. Therefore hydrodynamic bearings such as spiral or herringbone groove type Hatch 1995, 1996;Ku 1996Ku , 1997, three-lobe type (Yoshida et al 1996) and others (Ono et al 1998;Zhu and Ono 1999) have been studied for application in hard disk drives. Since the reliability of lubricant sealing has been improved, a fluid bearing is now being widely used for hard disk drives not only in mobile computers but also in high-end computers.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of a disk-spindle supported by a plain journal bearing and pivot bearing

2005

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A hydrodynamic bearing is widely used for hard disk drives, and it is better than a ball bearing in terms of vibration suppression, noise reduction and shock resistance. However, its cost to performance ratio should be further improved. In this study we analyzed the stability of a disk-spindle assembly supported by a hydrodynamic plain journal bearing and a pivot bearing at the bottom of the shaft. As a result, we found that a half-frequency whirl of a vertical spindle caused by the plain journal bearing becomes stable if the gyro factor of the rotor is larger than 0.5. We examined the effects of the bearing design parameters on the stability of the diskspindle assembly, including the flexibility of the shaft. We also compared the stability of a disk-spindle assembly supported by two plain journal bearings and found that the vertical spindle is always unstable. Thus, the bottom end of the shaft should be supported as a fulcrum.

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A Comparison Study on the Characteristics of Five Types of Hydrodynamic Oil Bearings for Hard Disk Spindles

Cited by 2 publications

References 0 publications

Friction and wear of spindle motor hydrodynamic bearings for information storage systems during startup and shutdown

Friction and wear of spindle motor hydrodynamic bearings for information storage systems during startup and shutdown

Stability analysis of a disk-spindle supported by a plain journal bearing and pivot bearing

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