在商用车传动轴系统布置设计时,传动轴当量夹角、最大夹角及角加速度幅值应严格限制并尽可能小,但在某些工况下,校核好的参数并不能避免商用车重载爬坡工况下动态当量夹角对整车异常振动造成的影响,这就需要使重载爬坡工况下的传动轴动态当量夹角满足设计要求。1故障描述2014年5月,在河北唐山某品牌重卡服务站,批量出现某品牌6×4自卸车重载爬大坡抖动故障;但该车型在平整路面运行,无论空载还是满载,均没有出现抖动。如果对 Commercial vehicle drive shaft system layout design, the drive shaft equivalent included angle, maximum angle and angular acceleration amplitude should be strictly limited and as small as possible, but in some conditions, check the parameters well and can not be avoided commercial vehicles The impact of the dynamic equivalent included angle on the abnormal vibration of the whole vehicle under heavy load climbing condition needs to make the dynamic equivalent included angle of the transmission shaft under overloading condition meet the design requirements. 1 Fault description May 2014, a heavy truck service station in Tangshan, Hebei, a large number of brand 6 × 4 dumper truck ramp load jitter failure; but the model is running in the flat road, no-load or full load, no Jitter appears. If yes