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众所周知,柴油机曲轴和主轴承的装配工艺工序实际上需要满足一系列要求,其中最重要的是主轴承的最佳安装间隙和轴颈圆柱面与轴承抗摩擦层所形成的接触面贴合质量。这些要求的必要性和重要性是肯定的,因为它基本上决定了曲轴主轴承液体摩擦的稳定性和热状态。问题在于另一方面,即为保证主轴承的最大工作能力,如何让曲轴在静态位置时使轴颈和轴瓦贴合面接触良好。显然,对此问题反面回答要比正面回答更清楚。实际上,船用柴油机的使用经验和大量研究工作证明,只符合静态装配精度要求的曲轴主轴承在柴油机工作时将产生动负荷,引起曲轴的弹性挠曲,支承下沉等问题,总之会明显改变主轴颈和轴瓦支承面的接触位置,并破坏它们的接触质量。润滑间隙的任何变差都会造成液体摩擦状态破坏的先决条件,并相应地降低部件工作的可靠性。
As we all know, diesel engine crankshaft and main bearing assembly process actually need to meet a series of requirements, the most important of which is the main bearing the best installation clearance and journal cylindrical surface and bearing anti-friction layer formed by the contact surface fit quality. The necessity and importance of these requirements is affirmative because it basically determines the stability and thermal state of the fluid friction of the main crankshaft bearings. The problem is, on the other hand, how to ensure that the maximum working capacity of the main bearing, the crankshaft in the static position of the journal and bearing surface contact with a good fit. Obviously, the negative answer to this question is clearer than the positive answer. In fact, the experience of using marine diesel engines and a large amount of research work prove that crankshaft main bearings that only meet the requirements of static assembly precision will generate dynamic loads when working on diesel engines, causing the crankshaft to flex, The contact positions of the main journal and the bearing surface of the pad and the destruction of their contact quality. Any deterioration of the lubrication gap will cause preconditions for the destruction of the liquid friction state and correspondingly reduce the reliability of the part’s operation.