据现场反映,车辆检修后,尤其是心盘下面加垫木的车辆出厂后,运用一段时间,常发现心盘螺栓松动,有的心盘螺栓的背母或两个螺母一起脱落丢失。我厂虽特别重视螺栓紧固问题,但出厂后的车辆仍发现有些心盘螺栓松动。我们认为产生心盘螺栓松动的原因是心盘在车辆自重和载重的作用下,其翘起部分被压平,厚度也被压薄了,使心盘垫木与螺母间产生间隙。因该螺栓是双螺母紧固,没 According to the scene, vehicles overhaul, especially under the heart plate under the car after the car factory, the use of a period of time, often found heart screw loosening, and some bolt heart nut or two nuts off with the loss. Although our factory attaches great importance to the bolt fastening problem, the factory-found vehicles still find that some heart-plate bolts are loose. In our opinion, the cause of loosening of the heartbeat bolt is that the heartbeat of the heartbeat is flattened under the action of self-weight and load of the vehicle, and the thickness is also thinned, so that a gap is formed between the heartbeat pad and the nut. Because the bolt is a double nut, not