| 摘要 |
PURPOSE:To realize maintenance free in the proces of pre-load through applying pre-load to the captioned bearing in such a manner as deforming the circumfer ence of a track rail cavity part with use of a bearing steel by providing a cavity part in the track rail and fitting a moving case to the track rail. CONSTITUTION:A linear groove 11a, along which a bearing steel ball 12 is rotatable, is formed in a track rail 11. In addition, a moving case 13 has a circulation groove 13a for the bearing steel ball 12, whereby it is made slidable linearly on the track rail 11 via the bearing steel ball 12. A cavity part 14 is provided in the track rail 11, the circumference of which is deformed by inserting the moving case 13 into the track rail 11 for applying pre-load to the bearing steel ball 12. |
