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活塞销与销孔间属于过渡配合,在组装时活塞应进行加热,如果冷砸,往往会带来不良后果。 (1)热车起动困难由于冷砸活塞销,使活塞产生变形,特别是环槽被局部挤窄,环与环槽的正常间隙被破坏,即局部间隙太小,热车时环会卡死在环槽里,造成气缸压缩力不足,起动困难。冷车时却好起动,因为活塞环处在良好的密封状态。 (2)窜机油严重冷砸活塞销后,活塞油环的环槽变形最大,甚至油环不能进入环槽,即使勉强进入环槽,在高温下工作,油环很快被卡死,不能灵活
Piston pin and pin hole between the transition fit, the piston should be assembled in the heating, if the cold hit, often will have adverse consequences. (1) difficult to start the hot car cold piston pin, so that deformation of the piston, especially the ring groove is partially crowded narrow, ring and ring groove of the normal gap is destroyed, that is, the local clearance is too small, hot car ring will die In the ring groove, resulting in insufficient compression force cylinder start difficult. Cold start good, because the piston ring in a good state of sealing. (2) After channeling the oil severely, the ring groove of the piston oil ring deforms most, even the oil ring can not enter the ring groove. Even if it can barely enter the ring groove and work under high temperature, the oil ring will be stuck quickly and can not be flexible