发动机曲轴是发动机中最重要的部件之一，它承受复杂、交变的冲击载荷，是发动机设计的重点和难点。
The crankshaft is one of the most important components of engine, it endures complex and alternate load and it is the key point and difficulty of the engine design.
在齿形链传动中，链条承受周期性的交变载荷，其中链节啮入轮齿时产生的冲击载荷影响较大。
In odontoid chain drive, the chain bears a periodical alternating load, in which the impact load produced while the link meshes into the tooth of sprocket makes comparatively big effect.
这些接头和接箍在长期承受交变、冲击和振动载荷的工作条件下经常发生脱扣，甚至断裂。
Those tie-in and adaptor regularly drop out on secular cyclical loading, impulsion and vibration force, even breaking.
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