| 摘要 |
PURPOSE:To obtain a bearing device of good efficiency, by providing a receiving plate of high hardness respectively in the end of a shaft and in the internal bottom surface of a frame and mounting a ball rollably interposing between these receiving plates so that rolling friction is obtained by the ball making a planetary motion. CONSTITUTION:A shaft 11, which is fitted to be inserted into an opening part 10a of a bottommed cylindrical frame 10, is given tension in the thrust direction. Here a bearing provides the first receiving plate 12 made by an artificial ruby in the end of the shaft 11 further the second receiving plate 13 similarly made by an artificial ruby in the internal bottom surface of the frame 10. And a single ball 14 is mounted interposing between both the receiving plates 12, 13. Here the ball 14 forms its external diameter larger than at least a half of the internal diameter (d) of the frame 10. By the above constitution, the ball 14, which performs a planetary motion between both the receiving plates 12, 13 if the shaft 11 rotates, diffuses grease interposed between both the receiving plates 12, 13 and the ball 14, and good lubricating action is obtained.
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