Friction and Wear Performance of Double-bump Design of Piston Skirt Main Thrust Side
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ght © 2020 KSAE/ 11823 pISSN 12299138/ eISSN 19763832
FRICTION AND WEAR PERFORMANCE OF DOUBLE-BUMP DESIGN OF PISTON SKIRT MAIN THRUST SIDE Yin Bifeng1)*, Zu Jiajun1), Xu Bo1), Huang Gongyin2) and Yang Manying2) School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China Technology Center, Kolbenschmidt Huayu Piston Co., 11 Taibo Road, Shanghai 201800, China 1)
2)
(Received 8 January 2020; Revised 28 February 2020; Accepted 10 March 2020) ABSTRACTAs 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 doublebump 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 %. KEY WORDS : Piston, Skirt profile, Main thrust side, Concave cavity, Wear
1. INTRODUCTION
original profile test result, the result showed that the new profile piston friction average effective pressure decreased by 12 %. Mansouri and Wong (2005) established a secondorder motion model, which was based on the fluid dynamic lubrication theory and force balance equation of the piston. The results showed that the middle convex profile can greatly reduce the second-order motion amplitude and improve the piston guidance capability. Wu et al. (2014) took earthworm as a bionic object, and designed different bionic hole parameters in the skirt, which could optimize the friction of the skirt surface to further reduce the piston skirt wear. The above research explored the influence of the piston profile on the engine performance, and the researches focused on the optimization of the parameters such as the middle bump height and the curvature. Most researchers investigated the main convex profile, but the double-bump profile was seldom applied. The double-bump profile is based on the main convex profile, with the addition of the upper bump and the cavity feature. The focus of this paper is to improve the wear distribution of the piston skirt and the lubrication contact between piston and cylinder. The novel profile in this paper is proposed to reduce the effective contact area
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