Title: Studying the load capacity and frictional force in an engine based on microtexture's different dimensions

Authors: Jili Zha; Vanliem Nguyen

Addresses: School of Mechanical and Electrical Engineering, Hubei Key Laboratory of Intelligent Conveying Technology and Device, Hubei Polytechnic University, Huangshi, 435003, China ' School of Mechanical and Electrical Engineering, Hubei Key Laboratory of Intelligent Conveying Technology and Device, Hubei Polytechnic University, Huangshi, 435003, China

Abstract: The solid contact force (F_sc) and frictional force (F_fsc) generated in the mixed lubricating zone of the crank pin bearing are very high and greatly affect the engine power. Based on the lubricating model of the crank pin bearing, the hemispherical structure (HS) and round cylindrical structure (RCS) of the microtextures are researched and added in this mixed lubricating zone to reduce both F_sc and F_fsc. Research indicates that both HS and RCS improve the lubrication and friction better than without microtextures (WMT). Besides, HS's performance in improving the lubrication and friction is also better than RCS. Especially, with the optimised HS using r_t = 1.4 mm and h_t = 10 μm, the average values of F_sc and F_fsc are reduced by 35.1% and 36.4% compared to HS while these average values are greatly reduced by 56.9% and 57.4% compared to WMT. Therefore, this is a feasibility study in improving engine power.

Keywords: engine power; crank pin bearings; load capacity; frictional force; microtextures; hemispherical structure; round cylindrical structure; RCS.

DOI: 10.1504/IJSURFSE.2025.144834

International Journal of Surface Science and Engineering, 2025 Vol.19 No.1, pp.43 - 60

Received: 28 Mar 2024
Accepted: 10 May 2024
Published online: 04 Mar 2025 *

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