例1 一辆尼桑双排座客货车,当行驶速度到达40km/h时,底盘出现“咕噜、咕噜”的响声;当行驶速度为 50 km/h～60 km/h时,响声增大;当行驶速度达到 80 km/h以上时,则听不到异响。从现象看,其响声与后桥轴承及半轴轴承发出的响声有相似之处。但经仔细反复听诊,后桥及半轴轴承并无异响。后在试车时,发现前轮响声明显,遂停车检查,见两前轮胎冠外侧磨损严重(呈坑穴状)。换上经动平衡试验后的两前轮,并校正前轮前束后试车,响声消失。 Example 1 A Nissan double-decked passenger van with a “grunt and grunt” sound when the driving speed reaches 40 km / h and a loud noise when the driving speed is 50 km / h to 60 km / h. When When the driving speed reaches more than 80 km / h, no abnormal sound will be heard. From the phenomenon of view, its sound and rear axle bearings and half-shaft bearing the sound of similarities. However, after careful repeated auscultation, axle and axle bearings no abnormal sound. After the test, it was found that the frontal ringing sound was obvious, then stop inspection, see the two front tire crown outside the serious wear and tear (pit). Put on the two front wheels after the balancing test, and correct the front wheel before the beam test, the sound disappears.