某柴油发动机主轴承盖螺栓拧紧规范研究

Research on Tightening Specification for Certain Diesel Engine's Main Bearing Cap-screws

针对某柴油机主轴承盖螺栓采用现有拧紧规范拧紧后产生的预紧力不能满足设计要求的问题,通过改进涂油方式和拧紧方式对现有拧紧规范进行了优化。现场测量和数据分析表明:采用这一优化的拧紧规范,该螺栓达到了预紧力设计要求,从而在很大程度上提高了缸体和曲轴乃至发动机整机的可靠性。

It was found that the preload of the main bearing cap-screws using the existing tightening specification did not satisfy the design requirements. To solve this problem, the existing tightening speci- fication was optimized from the aspects of lubricating and tightening method. Field measurement and data analysis show that with the employment of this optimized tightening specification, the cap-screw has reached the design requirements for tightening, thus could substantially improve the reliability of cylinder block and crankshaft, and the engine as a whole.