| 摘要 |
PURPOSE:To long maintain a life of use while preventing a coefficient of speed variation from largely changing. CONSTITUTION:In a bearing 13 for supporting a rotary shaft 17, an annular retainer 25 for rollably holding a plurality of balls 30 is arranged between outer/inner rings 23, 24. A grease accumulating part 27 in a shape, almost enveloped by a surrounding wall 29 having a peripheral wall 28, is formed in an upper end part of the retainer 25. A total filling amount of grease 31 injected to the grease accumulating part 27 is set so as to be in a range of about 5.5 to 10% relating to space volume in the inside of the bearing 13. |
