发动机主轴承是曲轴组的一个关键零件，对它的使用、维护或装配不当，都会造成主轴承的早期损坏，并直接影响着发动机的可靠性和使用寿命。现对主轴承早期损坏的类型。特点及原因分析如下：（1）机械损伤主轴承机械损伤系指轴承的合金表面出现程度不同的沟痕，严重时在接触面上 The main bearing of the engine is a key part of the crankshaft set. The improper use, maintenance or assembly of the main bearing of the engine can cause the early damage of the main bearing and directly affect the reliability and service life of the engine. Now on the main bearing the type of damage. Characteristics and reasons are as follows: (1) Mechanical damage The main bearing mechanical damage refers to the alloy bearing surface of different degrees of groove marks, serious in the contact surface