| 摘要 |
PURPOSE: To remove the static electricity to be generated during the sliding by making a shaft or a bearing of the ceramics material having the prescribed volume specific resistance. CONSTITUTION: A bearing device consists of a dynamic radial bearing 3 of rotary sleeve shape having a groove 4a of the herring bone shape and a dynamic thrust bearing 2 having a spiral groove 2a opposite to the end face of a shaft 1, and the sleeve is rotated with the shaft 1 as a fixed shape. When the tip of the shaft 1 slides with the dynamic thrust bearing 2 during the start/stop, or at the low speed rotation, the total load of a rotary body is applied to the tip of the shaft 1 and the dynamic thrust bearing 2. Because the dynamic thrust bearing 2 is made of the ceramics material having the conductivity, i.e., the ceramics material whose volumetric specific resistance of <=10<6>Ω.cm, the static electricity generated in the sliding can be efficiently removed.
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