| 摘要 |
<p>At least either of an inner ring and an outer ring of a bearing has a bottom thickness equal to or more than 50% of the diameter of the balls of the bearing. The outside diameter of the outer ring is equal to or less than 65 mm, the diameter of the balls is equal to or less than 4 mm, and the width of the bearing is equal to or less than 45% of the inside diameter. Further, the pitch circle diameter of the balls is shifted to the outside diameter more than the center of the bearing cross section, EP steel is used, the outside of the outer ring rolling groove has a tapered face, the inside of the angularly-placed inside outer ring is located at a position more toward the center line of the bearing than the outside of the outer ring rolling groove, the outside chamfer of the cage back is larger than 1/2 of the cross section width, or the bearing is provided with a seal having lips and fitted into an inner ring seal groove.</p> |
