发明名称 |
PCD Enhanced radial bearing. |
摘要 |
<p>Bearing rings containing PCD faced bearing inserts are mounted adjacent tungsten carbide radial bearing sufaces at the ends of respective bearing sleeves attached to the drive shaft of a down hole well drilling motor, thereby preventing excessive wear at the extremities of the radial bearing surface in controlled and steerable drilling applications.</p> |
申请公布号 |
EP0290839(A2) |
申请公布日期 |
1988.11.17 |
申请号 |
EP19880106481 |
申请日期 |
1988.04.22 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
MCPHERSON, JAMES N. |
分类号 |
E21B4/00;E21B7/06;F16C33/04;F16C33/24 |
主分类号 |
E21B4/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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