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活塞销一般由合金钢(20Gr)制成,加工后经表面渗碳、淬火、抛光处理。活塞销与连杆套为间隙配合;与活塞销孔为过渡配合。 在发动机工作中,活塞销承受很大的周期性冲击载荷。其磨损部位主要是在与活塞销孔、连杆衬套相配合的工作表面。磨损后的活塞销在配合处形成环形台阶,工作时会产生金属敲击声。凡磨损出现环形台阶或疲劳裂纹的活塞销,均应更换。但有条件的修理厂可以采取按修理尺寸光磨、扩张和镀铬方法修理。
Piston pin usually made of alloy steel (20Gr), after processing the surface carburizing, quenching and polishing. Piston pin and connecting rod sleeve for clearance fit; and piston pin hole for transition fit. In engine work, the piston pin is subjected to a large cyclic impact load. The wear parts are mainly in the piston pin hole, connecting rod bushing match the work surface. The worn piston pin forms a ring-shaped step in the mating area, which produces a metal percussion sound when working. Piston pins that wear circular steps or fatigue cracks should be replaced. However, the condition of the repair shop can be taken by the repair size optical grinding, expansion and chrome repair methods.