| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball bearing to the market, made of engineering plastic having chemicals-resistant property, heat-resistant property, and mechanical strength, and introduce the ball bearing capable of bearing not only a radial load and but also a thrust load. SOLUTION: An outer ring 10, an inner ring 20, and a retainer 30 are made by injection molding, and one end face of the outer ring 10 is integrally formed with an end-face wall 11 projected inward. A first guide groove 12 having approximately one third of an arc in section is formed on an inner peripheral surface of the outer ring and an inner surface of the end-face wall 11. The inner periphery of the end-face wall 11 reaches inside the circle of locus for the center points of bearing balls B. Further, a second guide groove 22 is formed on an outer peripheral surface of the inner ring 20. A base portion of the retainer 30 is a ring shape. A spaced projection 32 inserted among the bearing balls B is projected and formed inside the retainer. A small counter lock 14 fixing an outer end edge of the retainer 30 is formed on the inner peripheral end of the outer ring 10.
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