大功率柴油机组合活塞裙部摩擦特性研究

摘要

根据流体动力润滑理论和系统动力学原理对16V280ZJB型大功率柴油机组合活塞裙部进行摩擦特性研究.由活塞的二阶运动理论建立动力学运动方程,由缸套-活塞裙部流体动力润滑理论和微凸体弹性接触模型建立缸套-活塞裙部摩擦学方程,根据以上两个耦合方程计算出活塞裙部的摩擦力,摩擦功耗以及在主次推力面上的最小油膜承载厚度.以及活塞在不同工况下的横向运动和摇摆运动等动力学结果,对计算的结果进行分析和优化可以降低组合式活塞裙部对气缸套的撞击和摩擦,改善活塞裙部的润滑条件.%Based on the hydrodynamic lubrication theory and system dynamics,the research on tribology characteristic of the combined piston of 16V280ZJB type high-power diesel engine was established. According to the secondary movement of the combined pi$ton,the piston transverse and swing movement was calculated.The friction force,friction power consumption and minimum oil film thickness would be calculated by the means of the coupled hydrodynamic lubrication theory and the convex body elastic contact model.The analysis and optimization will lessen the crash and friction and improve the lubrication condition towards cylinder jacket.