| 摘要 |
A bearing (2, Fig. 1 ) comprising a plurality of rolling elements 8, 10 disposed between a first race 4 and a second race 6. At least one of the rolling elements 8, 10 is a control element 10 having characteristics which differ from the remaining rolling elements 8. Rotation of the first race 4 with respect to the second race 6 causes the control element 10 to travel at a precessional speed which is greater than or less than the precessional speed of the remaining rolling elements 8.
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