| 摘要 |
<p>A bearing system in an annulus between a shaft and a housing comprising a seal means in the annulus and bearing means on either side of the seal means, one of the bearing means having a piston means associated therewith to provide a lubricant reservoir which is sealed from external pressures and which will vary in volume depending upon the amount of lubricant present. A downhole drilling tool employing the above bearing system together with a downhole motor operably connected to the shaft of the bearing system, the other end of the shaft being adapted to carry a drilling bit.</p> |
