| 摘要 |
A plurality of retaining grooves for rolling members are arranged in the inner cylinder. The retaining grooves have semicircular bottom halves and top halves having sector-shaped sections diverging radially outwardly. The rolling members are accommodated in the bottom halves of the retaining grooves and grease fills the top halves. Then, the inner cylinder is fit into the outer cylinder. In rotating the bearing, the rolling members are rotated by the bottom halves of the retaining grooves serving as a sliding bearing and rolled on the inner peripheral surface of the outer cylinder. When a heavy load is applied, the rolling members are pushed down to the same level as the outer peripheral surface of the inner cylinder, thereby distributing and supporting the load by the outer peripheral surface of the inner cylinder and the rolling members. Therefore, the present invention can provide a roller bearing which is made compact by omitting the retainer for the rolling members and which exhibits good lubrication performance and endurance, avoiding vibration and noises.
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