发明名称 |
An improved rotary roller reamer |
摘要 |
<p>The invention relates to a roller assembly (20) including a roller pin (22) and a roller (24) arranged to be mounted on said roller pin, seal means (34a,34b) between the roller pin and the roller arranged to prevent leakage of a lubricant from a clearance between the roller pin and the roller. The roller pin includes a bore (22c) which acts as a lubricant reservoir and is arranged so that lubricant from the lubricant reservoir can flow into the clearance. The bore is further arranged to receive a stationary pressure equalisation means (36). The pressure equalisation means serves to substantially equalize the pressure of the lubricant in the clearance on the seal means with the pressure of drilling mud surrounding the roller during use of the roller assembly so as to prevent damage to or blow out of the seal means.</p> |
申请公布号 |
EP2058470(A2) |
申请公布日期 |
2009.05.13 |
申请号 |
EP20090001726 |
申请日期 |
2003.11.07 |
申请人 |
EXTREME MACHINING AUSTRALIA PTY LTD |
发明人 |
KENNEDY, JOHN FRANCIS;SLATTERY, MICHAEL DESMOND |
分类号 |
E21B10/30;E21B10/24 |
主分类号 |
E21B10/30 |
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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