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Fault case analysis of universal transmission device

Views: 1     Author: Site Editor     Publish Time: 2021-12-03      Origin: Site

Case 1: annoying vehicle vibration fault phenomenon 

A 1997 dodge a minivan MPV commercial vehicles, car owners reflect the speed of the car at 60 km/h can obviously feel aboutsingle-double-universal-joint-shaft-price-Xinsanming body vibrate, the front body feel particularly, in the process of accelerated vibrate more severe, stepped accelerator pedal to vibrate rapidly became very intense, but if it is a slow step on the accelerator pedal vibrating will seem less, don't tread accelerator pedal is almost can't feel. The owners also reported that the vehicle was even more unbearable when it was going uphill with a heavy load, but recovered when the speed exceeded 70km/h. The axle driveshaft is broken.

Fault diagnosis and elimination

According to years of maintenance experience judgment, this kind of fault is mainly due to the loosening of suspension, or hinged part of the gap with a larger vibration, when the vibration and body vibration frequency in a moment of overlap caused by the vibration amplitude increased, the formation of resonance. Lift the vehicle, carefully check the chassis, and use a crowbar to pry each rubber sleeve and ball head. It is found that the ball head of the lower right control arm is slightly loose. After replacing the ball head, the fault is slightly improved, but still exists:

This kind of situation also occurs when the axial pendulum momentum of the wheel exceeds the standard. Remove the front wheel, re-balance it dynamically, and observe the car.

It was found that the yaw of the wheel was not serious, but the two wheels with lighter yaw were selected from the four wheels to be installed on the front wheel and tested again. The failure still exists.

Repeated test runs, chassis inspection, no valuable clues, it seems that we should shift the direction of thinking. Will the vibration source of the vehicle come from the engine or transmission, and eventually transmitted to the body? Raise the car, start the engine to rotate the front wheels and keep the speed at 60km/h. At this time in the car can obviously feel the engine and transmission left, right swing than the body more intense. After careful observation, it was found that the vibration source came from the left drive shaft. After turning off the car, the left drive shaft can be shaken hard, and the sound of "clanging" can be heard. Therefore, it can be determined that the fault is caused by the large internal clearance of the ball cage in the drive shaft.

Disassemble the ball cage in the transmission shaft, and check that the ball cage is a star three-pin universal joint. The clamp of the dustproof sleeve of the transmission shaft in the ball cage on the left has become loose, and the grease has leaked light, and there is water in it. Due to the lack of grease lubrication for a long time, the inner wall of the ball cage side has worn out a deep groove, three small bearing needle roller some also due to wear out of the slide.

Because there are grooves on the inner wall of the ball cage, the expansion of the drive shaft is limited, so it causes the engine to swing around, which leads to the body of the car. When the vehicle speed is at 60km/h, the frequency of transmission shaft expansion overlaps with the natural frequency of engine swing through the engine support seat, resulting in the maximum amplitude of vehicle shimmy. When the speed reaches 70km/h, the frequency of expansion of the drive shaft differs greatly from the natural frequency of the engine's swing through the support seat, so the phenomenon of shimmy will disappear when the speed exceeds 70km/h.

Troubleshooting after replacement of left drive shaft assembly.

Case two: driving left front wheel "click" sound

The fault phenomenon

A passenger car running 65400km jetta, when the vehicle is running, there is a "click, click" sound at the left front wheel, similar to metal extrusion sound, abnormal sound is more serious when turning.

Fault diagnosis and removal Lift the vehicle, after inspection found that the right drive shaft outside the constant speed universal joint dust-jacket broken, its internal grease overflow. Remove the right drive shaft, remove the dust jacket, found that there are a lot of silt in the outer uniform speed universal joint bead rack raceway. After cleaning with gasoline, it was found that there were two cracks in the universal joint bead stand, and there were scratches and pitting in the raceway, so it could not be used. Replace the new external constant speed universal joint and dust jacket, the fault is eliminated. According to the requirements, Jetta cars should be checked and maintained regularly. Once the dust jacket of the ball cage is damaged, it should be replaced in time to avoid damage to the ball cage.

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  : +86 29 86033971
 : +86 29 86033972
  :  zhao.wanbao@dcsxsm.com
  : The Innovation Industrial Park, No.36, Jingwei Road ,Xi'an Economic and Technological Development Zone,Xi'an City,Shaanxi Province,China
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