缺点：脆性，使用时注意尽量避免或减少敲击，摔打，突然性碰撞等。

Shortcoming: fragility, Pay attention to avoid or reduce knock and bang and sudden collision.

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说明改进活塞的结构，对于降低活塞碰撞冲击力和活塞敲击噪声具有一定的效果。

It is proved that the improvement of piston structure is effective to decrease the impact force and the knock noise caused by the piston.

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又通过发动机机体表面振动加速度，确定活塞敲击噪声产生的根源在于活塞与缸套的碰撞冲击。

It has also been clear that the source of piston knock noise is the impact between piston and cylinder sleeve by the vibration acceleration of the engine's body surface.

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