This paper takes the soft connection of passenger car instrument panel bolts as the object.To determine the main influencing factors for the occurrence of loosening of the bolted soft joints by conducting theoretical analysis of them.Design the instrument panel bench test according to the actual service environment conditions,including natural environment and road load.To obtain the tightening torque and the degree of decay of the preload force of the bolted soft connection points under different service conditions through the bench test,which verified the correctness of the results of the analysis of the main influencing factors of soft joint loosening.Based on the main influencing factors and failure mechanism of bolt loosening,the inverse proportional decay model of bolt soft connection preload force with environmental vibration and the exponential decay model of bolt soft connection preload force with high and low temperature cycles are established.Loosening prevention suggestions such as increasing the strength of the connection,reducing the mounting hole,and adjusting the mounting direction of the connection point are put forward.
关键词
仪表板/螺栓软连接/松动/预紧力/衰减规律
Key words
instrument panel/bolt soft connection/looseness/preload/decay law
维普
万方数据