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发动机在大批生产条件下,气缸活塞组报废的主要象征除摩擦表面的磨合质量外,就是配合面之间的敲击。敲击经常发生在活塞头与缸套的接触表面之间。在连杆摆动的平面内敲击是活塞头间隙不足和工作时活塞裙部的变形较大。在缸体纵向并与纵轴成30°～60°角方向,有敲击则由于气缸活塞组和曲柄连杆机构的位置偏差。在零件位置偏差值较大时会在活塞头部及裙部产生边界压力,致使与缸套接触的活塞头磨损加剧。这些部位磨合变坏使活塞环、活塞和缸套产生擦痕和擦伤。
Engine in a large number of production conditions, the main symbol of the cylinder piston group scrapped in addition to the quality of the friction surface of the run-in, that is, with the surface between the percussion. Tapping often occurs between the piston head and the contact surface of the liner. In the swinging plane of the connecting rod, the piston head gap is insufficient and the deformation of the skirt portion of the piston is larger when working. In the longitudinal direction of the cylinder and the longitudinal axis of 30 ° ~ 60 ° angle direction, there is knock due to the cylinder piston group and the crank link mechanism position deviation. When the position deviation of the part is larger, the boundary pressure will be generated on the head and the skirt of the piston, resulting in the abrasion of the piston head in contact with the cylinder liner. These parts run into bad so that the piston ring, piston and cylinder liner scratches and abrasions.