摘要
从接头系统的角度,对副车架到车身的连接接头进行了设计计算,选择了固定点的数量和接头的类型。从接头外载计算入手,进行了紧固件的初选,并计算了接头预载损失、预载需求和紧固件的啮合长度。根据最大预载需求,得到了扭矩规范,并提出了根据试验结果,进行能力分析,以评价实际预载是否满足需求。最终试验结果表明:在扭矩下限时,剩余夹紧力满足可靠性设计要求;对接头的强度进行了理论计算和CAE分析,结果表明,理论计算在准确度和应用范围都有很大的局限性,CAE计算结果能更好地反映实际情况。
The connecting parts between subframe and vehicle body is designed as a joint sys tem. Numbers of connection points and connection type are selected. Then fasteners are selected when the load is identified, then the load loss, pre-load required and screw engaging length are calculated. The torque specification is get from the maximum pre-load requirement, and capability analysis on real test results is used to judge whether the pre-load can meet the requirement. The result shows that the remained clamping force is reliable when tighten to the lower torque limit. The strength of key compo- nents is also calculated in theory and analyzed by CAE. The result shows the academic formulas are not accurate enough and should not be widely used. CAE results are more practical.
出处
《上海汽车》
2014年第10期23-28,共6页
Shanghai Auto
