发明名称 |
Earth boring bit with bearing sleeve |
摘要 |
An earth boring bit having an improved two piece bearing construction using an internally tapered and threaded, cantilevered bearing lug extending obliquely inwardly and downwardly from a leg carried by the body of the bit. An internally tapered and threaded bearing sleeve is made up on the lug, and includes a mouth that engages a shoulder on a base region of the bearing lug. The mouth of the sleeve has a minimum radial thickness such that the sleeve may be made up to a selected minimum torque. The bearing sleeve has a length greater than that of the treaded portion to define a thick walled inner end region to receive a resilient retainer ring in a groove that provides a minimum section over the threads on the interior of the sleeve. The sleeve is boronized to achieve wear resistance in a manner that does not substantially reduce strength.
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申请公布号 |
US4600064(A) |
申请公布日期 |
1986.07.15 |
申请号 |
US19850705158 |
申请日期 |
1985.02.25 |
申请人 |
HUGHES TOOL COMPANY |
发明人 |
SCALES, STANLEY R.;SHOTWELL, DUANE E.;ATKINSON, GERALD O. |
分类号 |
E21B10/20;E21B10/22;F16C33/08;(IPC1-7):E21B10/20 |
主分类号 |
E21B10/20 |
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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