How to recognize automobile transmission shaft
发布时间：2016.10.18 新闻来源：邢台远拓汽车零部件制造有限公司
The identification method of transmission shaft is as follows:
The universal transmission device is often affected by vehicle in complex on the road, so that the transmission shaft in the angle and length of the changing situation of the transmission torque, therefore often drive shaft dynamic unbalance, universal joint and the middle support Songkuang, sound fault.
1) analysis of the common faults of the drive shaft
Fault one, when the car starts to have the impact sound, always has the unusual sound in the movement.
Phenomenon: when the car starts, there is a crash; when driving heavy, when the speed change or high-speed gear travel at low speed, there is a crash sound, the whole process is almost noisy.
Reason
There is looseness at the joint of a flange of a drive shaft.
Universal joint journal and bearing wear loose.
The middle bearing support bolt is loose.
The inner ring of the intermediate bearing is loose or shock absorbing and rubber is damaged.
The bolts on the E and rear leaf springs are loose.
Diagnosis
When the car suddenly changes speed, there is always a metal percussion, most of the individual edge or universal joint bearings loose.
When the brake is slowing down, the heavy metal impact is found on the drive shaft, and it should be checked whether the riding bolts on the leaf spring are loose or not.
In the starting or running, there is always obvious abnormal sound and vibration, but generally it is the middle bearing, the support bolt of the bracket is seriously loose or the middle bearing is damaged.
When starting and changing the speed of the car, the impact is obvious. When the car is running at low speed, the abnormal sound is obvious when compared with the high speed. It shows that the inner race of the middle bearing is loose.
After parking, visually inspect and shake each part of the drive shaft to verify the above diagnosis.
Fault two, when starting is no noise, but there is a strange noise in driving.
Although the car started the phenomenon of abnormal sound, but when the speed when the abnormal sound, the sound clear, when coasting in neutral.
Reason
When the sliding fork is installed and dislocated, the universal joint fork at both ends of the transmission shaft is not in the same plane.
The middle bearing wear loose, lubrication bad or slight damage.
The bracket is crooked, the crossbeam rivet is loose, and the shock absorber rubber block is invalid.
The cardan joint is too tight and inflexible to rotate.
Diagnosis
At low speeds appear crisp and rhythmic metal percussion sound, coasting in neutral sound when clearly exists, the majority of the gimbal bearing outer ring is pressed, the rotation is not flexible. Such failures often occur after repairs and repairs.
Increase the speed after the sound increases, especially coasting in neutral, until disappeared after stopping. For intermediate bearing ring, if the sound muddy, dull and continuous, it indicates that the bearing pieces, removable drive shaft gear running, verify the sound is from the middle bearing. If the sound is continuous, can loosen the bearing cap bolt. If the sound disappears, indicating that the intermediate bearing installation deviation, if there is still noise, should check the bearing lubrication. If the sound is messy, and sometimes irregular impact, you should check the alignment of the drive shaft universal joint fork.
High speed shaft noise, coasting in neutral does not disappear, it should check whether there is damage to the surface of intermediate bearing seat and installation support.
Fault three: running in a periodic sound, the higher the speed, the greater the noise.
When the technology of the universal joint and the sliding fork is in good condition, the vehicle runs periodically. The higher the speed, the greater the noise, even accompanied by body vibration, the hands of the steering wheel feel numb.
Reason
The balance block falls off on the drive shaft.
The shaft is bent or the shaft is depressed.
The drive shaft tube is not welded with the universal joint fork, or the driving shaft has not been subjected to dynamic balancing test and calibration.
When the sliding fork is installed and dislocated, the universal joint fork at both ends of the transmission shaft is not in the same plane, and the speed of the drive with equal angles is not satisfied.
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