Cause analysis of abnormal sound of automobile transmission shaft

1. Observe the fault symptoms

1. When the car starts or when it is driving, there is a sound of impact on the transmission shaft, especially when it is driving at low speed in the high-speed gear position.

2. When the car starts, the drive shaft has the same sound, and when the car is running, the drive shaft has the impact sound.

3. When the car starts, the drive shaft has the same sound, and when the car slides, the drive shaft has the different sound.

The car made a lot of noise the whole time.

Two, analyze the cause of the failure

1. The flange connection of the transmission shaft (or the connecting bolt) is loose, causing abnormal sound.

2, all the grease fitting (commonly known as grease nipple), spider note not into the oil duct jam for grease, fail to filling grease, cross shaft oil seal damage and causes such as oil, caused the spider needle roller bearing under the condition of lack of lubricating oil for a long time to work, make a cross shaft neck, needle and sleeve wear is too large, forming loose kuang is caused by the different ring.

3, universal cross shaft assembly is too tight.

4, sleeve and universal joint fork hole with loose, loose support bolt lead to sleeve rotation, so that the universal joint fork hole wear is too large, loose and cause abnormal sound.

5, transmission second shaft spline and flange spline wear is too large, the formation of loose and loose and cause abnormal sound.

6, the middle support bracket fixing bolt of the transmission shaft is loose, the middle support and the journal of the middle transmission shaft are loose, the spline and flange keyway of the rear end of the middle transmission shaft are loose and the rear nut is loose.

7. The middle support bearing of the transmission shaft is broken, the bearing raceway is damaged, the bearing is poorly lubricated, and the wear is excessive and loose.

8. The installation position of the middle supporting bracket of the transmission shaft is skewed, the bearing pretightness is adjusted improperly, the rubber cushion ring is damaged, the fixing bolt of the middle supporting bracket is tightened too much or too small, which causes the deviation of the bracket position and other reasons, and causes abnormal sound.

9. The universal joint forks at both ends of the transmission shaft are not in the same plane, so that the constant speed arrangement is damaged and causes abnormal sound.