汽车在使用过程中,会发生机械磨损、粘附磨损和腐蚀磨损。其磨损规律如图一所示。在正常行驶里程OA内,磨损量随行驶里程的延长而缓慢地增加;当行驶里程超过OA以后,磨损量由OM迅速上升到极限磨损量OB。此时车辆将丧失工作能力并迅速损坏。需进行大修理作业才能恢复其技术性能。O In the process of using the car, there will be mechanical wear, adhesion wear and corrosion wear. The wear rule shown in Figure one. In the normal driving mileage OA, the amount of wear slowly increases with the extension of the mileage; when the mileage exceeds OA, the wear amount rapidly increases from OM to the limit wear OB. At this point the vehicle will lose its ability to work quickly damaged. Requires major repairs to resume its technical performance. O