| 摘要 |
A bearing armed at light duty rotation consists of an outer race (20) and an inner race (10) rotatably contained inside the outer race (20). Multiple annular ribs (13) are formed between the outer race (20) and the inner race (10) to reduce the contact area between the outer race (20) and the inner race (10) to minimize the friction force. Consequently, the bearing has a simple structure and excellent rotating efficiency.
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