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

The solid contact force (Fsc) and frictional force (Ffsc) 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 Fsc and Ffsc. 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 rt = 1.4 mm and ht = 10 μm, the average values of Fsc and Ffsc 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.