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1.引起连杆螺栓断裂的原因 (1)连杆螺栓材质不佳,加工粗糙,承受不了标准扭矩而变形或产生裂纹,在冲击力作用下产生应力集中而断裂。 (2)连杆螺栓未按规定力矩拧紧,螺栓过松,使连杆轴瓦间隙过大,发动机工作时,螺栓所受冲击力增大,而产生断裂。 (3)连杆螺栓拧得过紧时,螺栓受拉伸而产生塑性变形,强度降低,引起断裂。 (4)拧紧螺栓时,不是分几次交替拧紧,而是先拧紧一个再拧紧另一个,使螺
1. Cause connecting rod bolt fracture reasons (1) connecting rod bolt material is poor, rough processing, can not stand the standard torque and deformation or cracks, resulting in the impact of stress concentration and fracture. (2) The connecting rod bolt is not tightened according to the specified torque, the bolt is too loose, so that the clearance between the connecting rod bearing bush is too large. When the engine is working, the impact force of the bolt increases, resulting in fracture. (3) When the connecting rod bolts are tightened too much, the bolts are stretched and plastically deformed, the strength is reduced, and the fracture is caused. (4) When tightening the bolts, instead of tightening alternately several times, tighten one and then tighten the other,