发明名称 |
COMPOSITE ROCK BIT SEAL |
摘要 |
A high performance rock bit journal seal is formed from a composite material comprising an elastomeric material and a nonelastomeric polymeric material. The polymeric material is preferably in the form of fibers woven into a sheet. The elastomeric material includes at least one lubricant additive. The composite 'seal' material comprises a number of repeating sheets of polymeric fabric that are bonded together with the elastomeric material. In one embodiment, the seal includes a body formed entirely from the composite material, in which case both the static and dynamic seal surfaces are the same. In another embodiment, the seal includes a first body portion formed from the composite material, and a remaining body portion formed from a noncomposite elastomeric seal material. Seals formed from the composite seal material display enhanced wear resistance, reduced coefficient of friction, and improved high-temperature stability and endurance when compared to noncomposite seal materials, thereby both extending the useful life of seals formed therefrom and of rock bits that employ such seals.
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申请公布号 |
CA2217661(C) |
申请公布日期 |
2004.01.20 |
申请号 |
CA19972217661 |
申请日期 |
1997.10.07 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
CAWTHORNE, CHRIS E.;DENTON, ROBERT;KYKER, G. STEVE;HUANG, SUJIAN;JAMES, BRIAN A.;FANG, ZHIGANG |
分类号 |
E21B10/22;E21B10/25;(IPC1-7):E21B10/08 |
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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