| 发明名称 |
BORKRONE MED PRESISJONS-RULLELAGER. |
| 摘要 |
A sealed bearing roller cone rock bit (10) is disclosed having precision roller bearings (44) with very close fits. The bearing package includes highly refined and hardened surface finishes, special roller bearing metal materials and lubricants with specific lube viscosities. |
| 申请公布号 |
NO885102(D0) |
申请公布日期 |
1988.11.16 |
| 申请号 |
NO19880005102 |
申请日期 |
1988.11.16 |
| 申请人 |
SMITH INTERNATIONAL INC |
发明人 |
CROCKETT, DAVID PRESTON;ERPENBECK, GERARD PAUL;HOOPER, MICHAEL E. |
| 分类号 |
E21B10/22;F16C33/30 |
主分类号 |
E21B10/22 |
| 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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