As a key component of the engine, piston have to work in harsh environment for a very long time, its friction performance and operational reliability have been the research focus. In this paper, a four-cylinder diesel engine was used as the research object. The dynamic model considering multi-factors such as inertial parameters, surface roughness, thermal deformation and elastic deformation was established in Ricardo-Pisdyn software. The research mainly focused on the double-bump design of the main thrust side of the piston (exploring the parameters of the upper bump height, cavity depth etc.) on the friction and wear performance. The research showed that appropriately increasing the depth of the cavity can improve the wear within a certain range. However, if the cavity depth increase too much, the abrasion of the main thrust surface will be aggravated. After optimizing of the clearance and adopting the double-bump profile on the main thrust side, the accumulated wear load of the piston can be significantly reduced and its friction and wear performance will be improved. In this paper, the optimized accumulated wear load decreases from 31.65 MW/m² to 14.64 MW/m², drops by 53.7 %.

作为发动机的关键部件，活塞必须在恶劣的环境下工作很长时间，其摩擦性能和运行可靠性一直是研究的重点。本文以四缸柴油机为研究对象。在Ricardo-Pisdyn软件中建立了考虑多种因素的动力学模型，如惯性参数，表面粗糙度，热变形和弹性变形。研究主要集中在活塞主推力侧的双凸点设计（探讨上凸点高度，腔深等参数）的摩擦和磨损性能上。研究表明，适当增加型腔深度可以在一定范围内改善磨损。但是，如果型腔深度增加太多，主推力表面的磨损会加剧。优化间隙后，在主推力侧采用双凸点轮廓，可以显着降低活塞的累积磨损负荷，并改善其摩擦和磨损性能。在本文中，优化的累积磨损负荷从31.65 MW / m降低²至14.64 MW / m ²，下降了53.7％。