| 摘要 |
<p>The seal rotary rock bit comprises a main bit body having legs which each have a rolling cone cutter. A lubrication system is provided in each leg to provide lubricant to the bearing area between the cutter and the leg. The lubrication system includes a reservoir of lubricant communicating via passageways with the bearing area. The reservoir further includes a rubber boot moulded around a metal stiffener sleeve. A cover cap is attached to the rubber boot. The rubber boot is in the form of a resilient membrane and is exposed through the cover cap to the exterior of the rock bit and through the passageways to the interior of the lubricated bearing area. The vent and pressure relief system comprises an annular seat formed in the wall of the reservoir.</p> |
