| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for a free ball bearing capable of preventing powder dust from scattering in a clean room, and suppressing a movement resistance of a received ball retaining ring for increasing a rotation resistance of a main ball by retaining a received ball by means of a non-grease system in which a grease is not used. SOLUTION: There are provided a free ball bearing 10, a bearing device, a support table, a conveyance facility, and a turntable. The free ball bearing 10 includes a received ball retaining ring 50 and a ring portion 54 for driving that generates a driving force to the received ball retaining ring 50 by air suction. The received ball retaining ring 50 is provided in an internal space 11 secured between a ball receiving portion 23 and a cover portion 30 movably in a direction coincident with the depth direction of the ball receiving portion 23. The received ball retaining ring 50 has a ring-shaped holding piece 55 inserted between a hemispherical concave surface 21 of the ball receiving portion 23 of the body 20 and a main ball 42 so as to hold the received ball 41 to increase rotation resistance of the main ball 42. COPYRIGHT: (C)2011,JPO&INPIT |
