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一、活塞销的故障原因及现象 活塞销工作时,在高温下承受很大的周期性冲击载荷,且润滑条件差。当其配合间隙超过一定数值时,就会由于配合件松动而发出敲击声,引起额外的冲击负荷。配合间隙过小不能保证足够的润滑,容易引起抱死现象,造成活塞工作时对气缸壁的撞击。 二、活塞销的装配 1.活塞销与销座孔的修配 由于铝活塞的热膨胀大于钢活塞销,为防止发动机工作时两者配合间隙过大,引起冲击而加快磨损,因此在冷状态下,必须使销在座孔中有一定紧度。 (1) 铰削活塞销座孔至用手掌力量
First, the piston pin failure causes and phenomena Piston pin work, under high temperature to withstand a great cyclical impact load, and poor lubrication conditions. When the gap with more than a certain value, it will be due to the loose parts with a rattle, causing additional impact load. With the gap is too small can not guarantee adequate lubrication, easy to cause locking phenomenon, resulting in piston cylinder wall when the impact. Second, the piston pin assembly 1. Piston pin and pin seat hole repair As the aluminum piston thermal expansion greater than the steel piston pin, in order to prevent engine work both with the gap is too large, causing the impact and speed up wear and tear, so in the cold state, Must make the pin in the seat hole has a certain tightness. (1) Reaming piston pin hole to palm power