副车架开裂及中横梁焊缝断裂的原因和加固方法

ＸＱＤ３１４０Ｇ６Ｄ７．５吨自卸汽车所用底肋是由ＥＱ１１４１Ｇ５普通载货汽车改制而成的，使用中出现副车架开裂及中横梁焊缝断裂的故障，分析后认为产生故障的主要原因为：使用中超载；应力集中，自卸车车箱满载时，负载全部集中在副车架上，二者并没有形成刚性联结，当车在不平路面上行驶时，车箱对副车架产生冲击，轴距较长，轴荷分配不尽合理，相对而言副梁受力不好。针对上述故障，采取了加固措施，排除了故障。

Causes of Subframe Crack and Middle Cross Beam Welding Seam Breakage and Method of Reinforcement

Chassiss of 7. 5 ton dumper truck model XQD3140G6D is made by modifying the cornmon truck model EQ1141GJ. Failure of sub-frame crack and middle cross beam welding seam breakage has occurred in operation. Main causes of the failrure have been detected by analysis to be as follows:overload in operation;stress concentration;load to tally on the sub-frame,while the dumper truck body is in full load; when the dumper truck drivers on uneren road,impact occurres between the body and sub-frame as the two components have not been formed a rigid conncction ithe length of wheel base is cornparitively too long, load distribution is not so rational,and load on sub-frame relatively worse. Reinforcement measures are then adopted corresponoling to the above causes of failure,whick eliminates the trouble.