低速柴油机主轴承热弹流混合润滑与磨损耦合特性研究

In order to explore the lubrication characteristics of the main bearing under heavy load and its in⁃ teraction mechanism with wear, based on the micro-contact and fatigue damage mechanism of micro-convex body, the wear model of bearing material was constructed, and combined with the mixed thermal elastohydro⁃ dynamic lubrication theory, the coupling analysis model of mixed thermal elastohydrodynamic lubrication and wear of the main bearing was established, based on which, the wear distribution and evolution law of the main bearing under specific load at the time of ignition were investigated, and the effects of wear on lubrica⁃ tion characteristic parameters such as oil film pressure, oil film thickness and rough contact pressure were discussed. The effects of load, radius clearance, micro-convex friction coefficient and rotational speed on the wear characteristics of the main bearing were obtained. The results show that with the increase of wear time, the wear area increases from the center of the bearing zone along the circumferential direction of the bearing, the contact pressure decreases and the minimum oil film thickness increases, and that the increase of radius clearance and micro-convex friction coefficient and the decrease of rotational speed will aggravate the wear of bearing bush.