Its primary functions are to reduce wear and tear between bearing and shaft, and raise longevity of shaft and connection rod.
其主要功能是减少轴瓦与曲轴间的滑动摩擦磨损，提高发动机曲轴及连杆的使用寿命。
2
The some techniques of guide shaft and expansion excavation are improved for assure the successful construction and raise the safety coefficient.
为保证施工顺利进行，且提高安全性，对正反导井及扩挖系统进行了多项技术改进，提高了安全系数。
3
The top 15% of the shaft needs to be lined in order to make sure that a rescue capsule that will be used to raise the miners to the surface can run smoothly.