| 摘要 |
<p>A downhole apparatus, such as a stabiliser, having rotary bearing members in the form of bearing balls (36) which are each mounted for omni-directional movement within a bearing assembly (20) mounted on the body (12) of the apparatus. Each bearing assembly (20) comprises a housing (22) containing a plurality of circulating balls (28) confined to the interior of the housing and forming a supporting bed for the bearing ball (36).</p> |
