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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

PREDICTIONS OF LOAD CAPACITY IN THERMO-HYDRODYNAMIC LUBRICATION PROCESS FOR HERRINGBONE GROOVE BEARINGS

Yee-Ting Lee
Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan

Jyun-Rong Zhuang
Department of Mechanical Engineering, National Taipei University of Technology, Taipei 106, Taiwan

Yu-Hsuan Juan
Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan

An-Shik Yang
Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan

Chien-Sheng Liu
Department of Mechanical Engineering, National Chung-Cheng University, Chiayi 621, Taiwan

Yu-Hao Chang
Department of Mechanical Engineering, National Chung-Cheng University, Chiayi 621, Taiwan

Abstract

In recent times, micro-hydrodynamic herringbone grooved bearings (HGBs) have been broadly used for various high-performance electronic devices, such as high-speed CD-ROM drive, hard disk drive, laser scanner, copier equipment, etc. The herringbone grooves have excellent stiffness, load carrying capacity and leakage-free due to the groove pumping effect to realize long bearing life and reliability. However, bearings usually experience a substantial variation in temperature owing to viscous heating dissipation during operations. This significantly affects lubricant viscosity and the bearing performance caused by rises in oil film temperature. In this work, the characteristics including the lubricant film pressure, load carrying capacity and friction torque are predicted using the computational fluid dynamics (CFD) software ANSYS/Fluent® for a micro-hydrodynamic HGB with consideration of frictional heat source in lubricant films at different eccentricity ratios and rotating speeds. The simulation results of the velocity and pressure distributions revealed that the temperature effect on the bearings performance can result in deterioration of the load capacity thanks to a reduction in the pressure distribution for some operating cases.

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