横向稳定杆支架失效分析与改进

Failure Analysis and Improvement of Anti-roll Bar Bracket

重型商用车通过增加横向稳定杆提升车辆抗侧倾能力,而横向稳定杆与车身的可靠连接能够保证车辆在复杂工况下仍能稳定行驶。文章基于某型自卸车在重载急转弯下坡的矿区工况下,稳定杆支架螺栓频繁出现断裂问题。通过对横向稳定杆支架螺栓断口进行失效分析,确定螺栓失效原因为稳定杆支架与稳定杆吊杆总成结合面处发生疲劳断裂。其次,结合转弯工况对车辆进行动力学分析,车辆发生侧倾时,横向稳定杆主要通过扭转或弯曲产生抗侧倾力,进一步分析出螺栓疲劳断裂是由于剪切力和扭转力综合作用导致。最后,对稳定杆支架结构进行优化,道路验证结果表明优化后的新结构疲劳寿命增加,可适用矿区等恶劣复杂工况。研究对重型商用车应对复杂工况,提升车辆稳定性具有一定的指导意义。

Heavy commercial vehicles increase the vehicle's anti-roll ability by adding lateral anti-roll bar,and the reliable connection of the lateral anti-roll bar to the body can ensure that the vehicle can still drive stably under complex conditions.The article is based on the frequent fracture of the anti-roll bar bracket bolts of a certain type of dump truck under the driving conditions of the mine area with heavy load sharp turns and downhills.Through the failure analysis of the bolt fracture of the lateral anti-roll bar bracket,it was determined that the cause of the bolt failure was fatigue fracture at the junction surface between the anti-roll bar bracket and the anti-roll bar suspender assembly.Secondly,combined with the dynamic analysis of the vehicle in combination with the turning conditions,when the vehicle rolls,the lateral anti-roll mainly produces anti-roll force through torsion or bending,and further analysis shows that the fatigue fracture of the bolt is caused by the combined effect of shear force and torsional force.Finally,the anti-roll bar bracket structure is optimized,and the road verification results show that the fatigue life of the new structure is increased,which can be applied to harsh and complex driving conditions such as mining areas.The research has certain guiding significance for heavy commercial vehicles to cope with complex driving conditions and improve vehicle stability.