| 摘要 |
<p>A sealing system acts as a barrier to the drilling fluid, pulverized cuttings and other materials in the borehole preventing the materials from entering the bearing area of an earth boring cutter and retains lubricant inside the bearing area. At least one bearing pin extends from the body of an earth boring bit and a rolling cutter is mounted on the bearing pin. A seal assembly is located between the mouth of the cutter and the bearing pin. The seal assembly includes an "O" ring and a washer ring. The washer ring has a semi-circular or semi-elliptical cross section.</p> |
