Mutual influence of plateau roughness and groove texture of honed surface on frictional performance of piston ring–liner system

Abstract

The cylinder liner surface finish, which is commonly produced using the honing technique, is an essential factor of engine performance. The characteristics of the texture features, including the cross-hatch angle, the plateau roughness and the groove depth, significantly affect the performance of the ring pack–cylinder liner system. However, due to the influence of the honed texture features, the surface roughness of the liner is not subject to Gaussian distribution. To simulate the mixed lubrication performance of the ring–liner system with non-Gaussian roughness, the combination of a two-scale homogenization technique and a deterministic asperities contact method is adopted. In this study, a one-dimensional homogenized mixed lubrication model is established to study the influence of groove parameters on the load-carrying capacity and the frictional performance of the piston ring–liner system. The ring profile, plateau roughness, and operating conditions are taken into consideration. The main findings are that for nonflat ring, shallow and wide groove textures are beneficial for friction reduction, and there exists an optimum groove density that makes the friction minimum; for flat ring, wide and sparse grooves help improving the tribological performance, and there exists an optimum groove depth that makes the friction minimum.

Effects of the array modes of laser-textured micro-dimples on the tribological performance of cylinder liner–piston ring

“…For example, when texturing the liner with grooves, the effects of groove parameters are opposite for nonflat ring and flat ring. 9 Guo et al 10 textured micro-dimples on the liner of a marine diesel engine and suggested the best depth-to-diameter ratio is 0.1. Even under the poorly lubricated condition, surface textures on liner can also reduce the friction of ring-liner pair.…”

Cross-hatched groove influence on the load carrying capacity of parallel surfaces with random roughness

“…Similarly, Hu et al [30] studied the mutual influence of the plateau roughness and the groove texture on the frictional performance of PRCL. The effect of plateau roughness is incorporated at a local scale by the homogenized technique while the valley component is considered at a global scale, see Spencer [31].…”

Improving frictional performance of ring-liner system under cylinder deactivation conditions by surface texturing

“…ICE) has been widely explored by the researchers. [1][2][3][4] On the one hand, the CDA technology is observed to have high fuel economy by reducing the number of the active cylinders and closing the valves under some working conditions. 5,6 Gosala et al 7 investigated the impact of the CDA on the fuel economy of a six-cylinder ICE under low load conditions, the transient engine response for different modes of the CDA was also studied.…”