This report is described the examination of some hydrodynamic shapes formed at the annular surface of oil impregnated sintered porous bearing as DC spindle motor's bearing system. Herring Bone (Ⅰ&Ⅱ), Three Lobed Type or Sleeve as a radial hydrodynamic shape were proposed, and four kinds of specimens were produced as a porous journal bearing. It was examined experimentally to optimize the hydrodynamic shape of porous journal bearing with pivot supported condition by measuring the lubrication characteristics. This research report is especially referred the experimental examination for Settling Time, Lissajous Curve diagram or Shaft Whirling Behavior by measuring the Time History Waveform of shaft such as above mentioned lubrication characteristics under shaft unsteady condition. Furthermore, in this report, it is investigated to discuss the influences of diametral clearance change and gradient on starting revolution speed change to the lubrication characteristics by measuring the Time History Waveform of shaft under the same condition. In addition, in order to investigate more detailed rotating behavior of shaft, authors practice the Frequency Spectrum Analysis of Time History Waveform with FFT.
This report describes the study on the lubrication characteristics of porous journal bearings as a DC spindle motor's bearing system made with oil impregnated sintered materials having some hydrodynamic shapes. Herring Bone (Ⅰ & Ⅱ), Three Lobed Type or Sleeve as radial hydrodynamic shapes were proposed, and four kinds of specimens were produced for porous journal bearings with pivot supported conditions. They were examined experimentally to optimize the hydrodynamic shape of porous journal bearings by measuring the lubrication characteristics at the shaft starting state under sine-wave vibrated conditions. This report particularly refers to the experimental examination for Settling Time, Lissajous Curve Diagram or Shaft Whirling by measuring the Time History Waveform (T.H.W.) of the shaft such as the above mentioned lubrication characteristics under the same conditions. Furthermore, it was investigated to discuss the influences of vibrated frequency changes to the lubrication characteristics by measuring the T.H.W. of the shaft under the above conditions.
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