| 摘要 |
An ultrathin walled rolling bearing in which the noise level is reduced and thus the sound characteristics are improved is provided. The rolling bearing is composed of an outer member having in its inner periphery a raceway surface, an inner member having in its outer periphery a raceway surface, a plurality of rolling elements interposed between the raceway surfaces of the outer and inner members, and a cage for circumferentially equi-spacing the rolling elements. In this bearing, the ratio of the diameter DB of the rolling element to the pitch circle diameter PCD of the bearing is equal to or less than 0.03. In addition, the ratio L/M falls within a range of 0.8 to 0.95 in which L is the radial thickness of the cage and M is the radius difference between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member.
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