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This study proposes the combination of some hydrodynamic pressure shapes formed on the end surface or on the annular surface of porous oil impregnated sintered bearing as a DC spindle motor's bearing system, and examines experimentally to optimize the hydrodynamic shape combination as thrust-radial composite bearing. Hydro Wave Bearing or Pump in as a thrust hydrodynamic shape, and Herringbone, Three lobed type or Sleeve (as a standard) as a radial hydrodynamic shape, were proposed, and the total of six kinds of combinations was produced as thrust-radial composite bearing. Floatation, temperature rise, friction torque and shaft whirling, such as the lubrication characteristics were examined experimentally. As experimental results, it was confirmed that low shaft whirling, energy-saving and life-longevity of bearing itself, were achieved by hydrodynamic pressure interaction of thrust-radial composite bearing.

nihon kikai gakkai ronbunshū. c

Experimental Study on the Thrust-Radial Composite Porous Bearings with Hydrodynamic Shape Forming (Experimental Research of the Effects and Lubrication Characteristics of Radial or Thrust-Radial Composite Porous Bearings with Hydrodynamic Shape Forming on the Annular or on the End Surface)