Theoretical and Experimental Research on Lubrication Performance of Laser Surface Texturing Cylinder Liner

Abstract

By applying the laser surface texturing technique to the engine cylinder liner surface,a mixed lubrication theoretical model of cylinder liner-piston ring is established.The model is calculated to reveal the influence of laser surface texturing on tribology performance with barrel-shaped ring.The results show that after the laser surface texturing,the lubrication and friction performance of the cylinder is improved,the effect of dimple is superior to the groove texturing,the minimum oil ratio in the middle regions of the strokes is increased by 29%,while the friction peak is decreased about 30%.By comparing the engine bench test,it is found that after the surface texture cylinder liner,the engine cylinder fuel consumption shows a declining trend relative to the original engine,the effect is improved significantly at a low speed,the maximum rate of fuel consumption is reduced 9.8 g/(kW h),a decline of 4.62%,which confirms that the surface texture technology is effective for reducing engine friction loss.Meanwhile,the other engine performance indicators also are improved to some extent,air leakage,smoke,oil consumption and other parameters is declined,the smoke is declined obviously,the largest leakage is decreased by 34.6%,and the oil consumption is reduced by 33.8%.