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一、拉缸的原因 1.活塞定位销钉松脱 起动机活塞材料为铸造铝合金,每个环槽内部设有铜质活塞环定位销钉,限制环的转动,以防活塞环开口端落入气缸壁面上的配气孔中而折断。起动机在工作时,活塞处于高温、高压、高速运动之中,当活塞受热后,其膨胀系数大于定位销钉的膨胀系数,所以定位销钉难以保持原来的配合紧度。活塞往复运动产生振动,会使定位销钉出现松动,使销钉孔慢慢磨大,直到销钉脱出,拉坏缸壁。
First, the reasons for pulling the cylinder 1. Pistons Positioning pin loose starter piston material is cast aluminum alloy, each ring groove with copper piston ring positioning pin to limit the rotation of the ring to prevent the piston ring opening end into the cylinder Wall with the hole in the fracture. When the starter is working, the piston is under high temperature, high pressure and high speed movement. When the piston is heated, its expansion coefficient is larger than the expansion coefficient of the positioning pin, so the positioning pin can not keep the original tightness. Piston reciprocating vibration, will make the positioning pin loose, the pin hole slowly grinding until the pin prolapse, pull the cylinder wall.