| 摘要 |
PURPOSE:To improve a load bearing performance, by such means that ball tracks are provided along the opposite sides of the bearing main unit, with a big angle of ball contact in a floating direction, and allowing a floating load of about 0.7 for 1 of the load from the above surface. CONSTITUTION:In a bearing main unit 10, a hole of almost trapezoidal cross section is axially constructed in such a manner as to provided loading tracks symmetrically in its inner portion, and two lines of load ball grooves 14, 15 in a top wall surface 11 of this hole and load ball grooves 16, 17 in a bottom wall surface of sloped side surfaces 12, 13 are constructed respectively. Parallelly to each of these ball grooves, relief ball grooves 18-21 are formed, and ball grooves in each set are linked through a U-letter shaped groove 29 in a side wall 26 put together at both ends of the main unit 10. To the inner surface of the main unit 10, are fixed holders 43, 44 in which slits 55, 56 are formed on a horizontal surface corresponding to each of the load ball grooves 14-17. At both ends of each slit 55, 56, is provided a tongue piece 57 for smoothing a rolling motion of balls 85.... |
