What are the hazards of transmission shaft torsional vibration?

There are many hazards of drive shaft vibration, which will produce noise, reduce transmission efficiency, loosen fit, and even cause parts to break and cause accidents.

Due to the high speed of the drive shaft, its rotation time changes. When it is unbalanced, it will generate large centrifugal forces of different sizes and directions. The light ones will produce vibrations, and the heavy ones will produce bending and twisting deformations, aggravating the wear of the drive shaft splines, intermediate bearings, universal joint cross journals, etc. In severe cases, the car body will shake, the drive shaft will also produce strong noises, and the steering wheel will also tremble and numb, making it impossible for the car to drive at high speed.

As follows: Methods for judging the torsional vibration fault of the car drive shaft:

1) Fix the gear plate vertically on the drive shaft, and fix the magnetoelectric sensor on the body through the bracket so that the magnetoelectric sensor is perpendicular to the gear plate and the distance is less than 2 mm. ;

The second is to connect the sensor to the test acquisition device, test according to different working conditions, and record the data collected by the magnetoelectric sensor;

Use Brahms software to process the above data, convert the time domain data into frequency domain data, and draw the speed-torsion angle curve;

When the curve has an obvious peak, it is judged that there is a problem with the torsional vibration of the car drive shaft.

Abnormal noise from the transmission shaft: Because the wheels jump up and down during driving; the output end of the gearbox is far away from the input end of the drive axle, and the distance is constantly changing due to the fluctuation of the wheels during driving.

Damage, wear, deformation and loss of dynamic balance of the transmission shaft will cause abnormal noise and vibration during the driving of the car, and in severe cases will cause damage to related parts. When the car is driving, a "Gordon" sound will be made when starting or accelerating quickly, which obviously shows the feeling of loose parts. If the driving gear of the drive axle is not loose, it is obviously the loose part of the transmission shaft. The loose parts are nothing more than the universal joint cross shaft or steel bowl, flange fork, spline shaft and spline sleeve of the telescopic sleeve. Generally speaking, the gap between the diameter of the cross shaft and the bearing should not exceed 0.13 mm, and the meshing gap between the telescopic spline shaft and the spline sleeve should not exceed 0.3 mm.