牙轮钻头目前的发展趋势是实现高速化，随着钻头转速的不断提高，在恶劣环境下工作的普通轴承密封这一环节的薄弱性将显得越来越突出。
The recent development trend of cone bits is to realize their high speed. Faster the speed of bit is, the more weak of common bearing seals worked under the rough environment is.
牙轮钻头目前的发展趋势是实现高速化，随着钻头转速的不断提高，在恶劣环境下工作的普通轴承密封这一环节的薄弱性将显得越来越突出。
The recent development trend of cone bits is to realize their high speed. Faster the speed of bit is, the more weak of common bearing seals worked under the rough environment is.
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