重型自卸汽车设计中经常选用三角臂组合式倾卸机构 ,应用的是铰链四连杆机械运动工作原理。通常对自卸汽车倾卸机构的计算是以三角臂为受力分析的研究对象 ;而若全面表达倾卸机构的受力状态 ,则须将倾卸机构作为受力分析的研究对象。实践证明 ,后者明显优于前者 ,具有应用的广泛性和较强的实用价值 Heavy-duty dump truck design often choose triangular arm combination dumping mechanism, the application of hinged four-bar mechanical movement working principle. The calculation of the dumping mechanism of the dump truck is usually carried out by using the triangular arm as the force analysis. If the stress state of the dumping mechanism is fully expressed, the dumping mechanism should be taken as the research object of stress analysis. Practice has proved that the latter is obviously better than the former, with wide range of applications and strong practical value