Abstract
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 %.
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