| 摘要 |
A sealing system acts as a barrier to the drilling fluid, pulverized cuttings and other materials in the borehole to prevent the materials from entering the bearing area of a rotary rock bit. The bit body and the base of the cone cutter cooperate to retain the seal unit. The seal is located in a groove and an effective seal is provided without reducing the bearing capacity of the bit's bearing system. The sealing system allows excessive pressures in the lubricant to be relieved. |
