| 摘要 |
PURPOSE:To improve the respondence of automatic alignment by forming the ball bearing with the oil impregnated sintered metal having spherical outside surface and by constituting its spherical outside surface so as to be covered with the solid lubricant. CONSTITUTION:To a bearing holding seat 13 a bearing enclosure 14 equipped with elastic metal bearing anchor pieces 15 and 16 or resin anchor pieces 15 and 16 integrally formed to the bearing holding seat 13 is formed. A ball bearing 17 forcibly inserted into the bearing enclosure 14 is elastically held to the bearing enclosure 14 with the bearing anchor pieces 15 and 16 so as to pivot freely. On this account, if the center of a shaft 18 leans, the aligning action is exerted so that the central line of the ball bearing 17 can be pivoted in the same direction. The spherical outside circumferential surface 19 receives no influence of elasticity, strong or weak, from the anchor pieces 15 and 16 as it is covered with the solid lubricant such as the graphite, teflon, etc. The ball bearing 17 is composed of the polypolous oil impregnated sintered metal having oil holes on the spherical outside circumferential surface 19 from which the solid lubricant infiltrates so as to prevent the dispersion of impregnated oil to the bearing 17 and to improve the aligning respondence.
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