| 摘要 |
PURPOSE:To reduce the vibration and seizure of a shaft to improve the accuracy, life, and power efficiency of a motor by making the inner periphery of a bearing shaft hole of anti-wear material, and forming the shape of a longitudinal section passing a shaft center into a convex facing the shaft center. CONSTITUTION:A bearing 9 is formed of a ceramic cylinder made of a alumina (Al2O3) or zirconia (ZrO2), and a shaft hole 11 which slidably supports a ceramic shaft 10 made of material having the same quality as the above material is formed at the center of the bearing 9. In addition, the bearing 9 has the shape of longitudinal section passing its shaft center which is formed of a part of a convex arc facing the shaft center. Consequently, the part of the bearing 9 coming into slidable contact with the shaft 10 becomes smaller to allow a larger offset angle, and the installation and alignment of the shaft can be easily carried out. Thus, the vibration and seizure of the shaft can be reduced to improve the accuracy, life, and power efficiency of a motor.
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