| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing device for a ball screw which can improve dust prevention function while independently sealing a screw groove of a screw shaft of a ball screw and its outer peripheral surface, and suppress frictional heat caused by contact rotation. SOLUTION: A circular body 5 made of porous polymer lubricant is fitted into a recession 4 formed on an opening end of a ball nut 2. A screw shaft 1 is loosely fitted to an inner peripheral surface 5a of the circular body 5. A circular recession and radial cutouts 5c, 5d communicated with the recession and opened to an outer peripheral surface 1a of the screw shaft are formed on thick portions of the circular body 5. Screw groove sealing members 6, 7 made of plastic are fitted to the radial cutouts 5c, 5d. Projections 6a, 7a to be fitted to screw grooves 1b, 1c are formed on the screw groove sealing members 6, 7. A garter spring 8 is wound around the screw groove sealing members 6, 7 and the inner side surface 5e of the circular recession 5b. The screw groove sealing members 6, 7 and the inner peripheral surface 5a are in press contact with the outer peripheral surface 1a of the screw shaft.
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