发动机关键工位螺栓包括连杆螺栓、曲轴螺栓、主轴承盖螺栓、气缸盖螺栓、飞轮螺栓和减振器螺栓等均属螺纹联接。

The key position bolt of the engine include connecting rod, crankshaft, main bearing, cylinder head, flywheel and shock absorber bolt, all of which belong to bolt fastening.

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本文论述了连杆螺栓联接松动的机理，并指出横向交变动载荷是使螺纹松动的主要因素。

The mechanism of self-loosening of con-rod bolts is discussed. It was found that trans-verse cyclic load is the most important factor affecting self-loosening of connecting rod bolts .

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