【作者】 王平；

【导师】 谢友柏；

【作者基本信息】 上海交通大学 ， 机械设计， 2008， 硕士

【摘要】 内燃机的活塞环-缸套系统的磨损对内燃机性能和寿命有着重大影响,并且与运动、润滑、摩擦等构成一个复杂的摩擦学系统。在设计内燃机时,以一个系统的角度来研究活塞环-缸套系统的磨损是非常必要的。本文从摩擦学系统的角度对活塞环-缸套系统的磨损进行了研究。首先给出了一个考虑了活塞-活塞环-缸套系统动力学、润滑、摩擦等因素的磨损模型,建立了磨损计算数值仿真模型。活塞环-缸套系统粘着磨损率随曲柄转速、润滑油粘度的增加而增加,随表面综合粗糙度、活塞环弹力增加而降低;活塞环-缸套系统磨粒磨损率随曲柄转速、表面综合粗糙度、润滑油粘度的增加而增加,随活塞环弹力的增加而降低。本文针对活塞环的形状提出了降低活塞环-缸套系统磨损率的减磨措施,包括:增加活塞环桶面高度、活塞环轴向高度、活塞环下半部分高度可以有效降低系统的粘着磨损率;通过选择合适的活塞环形状可以获得磨损率最低的活塞环设计方案。通过多种铁谱实验表明随着运转时间的增加,活塞环-缸套系统的磨损率逐渐增加。更多还原

【Abstract】 Wear of internal combustion engine piston ring-liner system, which has a closed relationship with the system’s lubrication and friction, has a significant impact on the engine’s performance. The Wear model should be a system model which contains lubrication and friction.A wear model was developed in a tribology system. Firstly, building a theoretical model which contains dynamic, lubrication and wear; secondly, building a mathematical simulation program using Fortran. Along with the increasing of crank speed, oil viscosity, the adhesive wear rate would increase and the abrasive wear rate would decrease. Along with the decreasing of surface roughness, ring elastic pressure, the adhesive wear rate would increase and the abrasive wear rate would increase.Giving some advises on the design of ring profile to decrease the piston ring-liner system’s wear rate. Increasing ring barrel profile height, ring axial height and ring barrel profile bottom part height could decrease the ring-liner system adhesive wear rate. There is a best ring profile for each engine to have a best decreasing wear rate design. Through different types of ferrograph analyzing, the piston ring-liner system wear rate increase with the running time increasing.更多还原