Based on the cam-roller pair of an internal combustion engine,a mathematical model of transient thermal elastohydrodynamic lubrication under finite line-contact and the corresponding full numerical solver were established.Under an actual load spectrum and other working parameters,the detailed lubrication performance of the cam-roller pair was obtained in a cam rotation cycle.The influences of the sliding between cam and roller and the roller tilting on the contact pair lubrication were analyzed.The results show that the cam-roller sliding results in noticeable increase in temperature and friction coefficient,which can deteriorate the contact zone lubrication.The roller tilting can worsen the lubrication of the contact zone,and increase the possibility of lubrication failure.Research is shown that considering the tilting of rollers when designing roller convexity can alleviate its negative impact to a certain extent.The results provide some theoretical data basis for the lubrication design of cam-roller pairs.