Inspection method of shock absorber working condition

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2020-11-11 00:00

In order to quickly reduce the vibration of the frame and the body and improve the ride comfort and comfort of the car, the car suspension system is usually equipped with shock absorbers, and the two-way acting cylinder shock absorber is widely used in automobiles.


Shock absorber is a vulnerable part in the process of car use. The working quality of the shock absorber will directly affect the stability of the car and the service life of other parts. Therefore, the shock absorber should be kept in good working condition. You can use the following methods to check whether the shock absorber is working well.


1. After driving 10 kilometers on a road with poor road conditions, stop the car and touch the shock absorber shell with your hands. If the temperature is not high enough, it means that there is no resistance inside the shock absorber and the shock absorber is not working. At this point, you can add appropriate lubricant and perform the test again. If the shell becomes hot, it indicates that the shock absorber is out of oil, and enough oil should be added. Otherwise, it means that the shock absorber has failed.


2. Press the bumper firmly and then release it. If the car jumps 2 or 3 times, the shock absorber is working properly.


3. When the car is driving slowly and braking urgently, if the car vibrates violently, it means there is a problem with the shock absorber.


4. Remove the shock absorber and stand it upright, then clamp the lower end connecting ring on the vise, and then forcefully pull the shock absorber rod several times. At this time, there should be a stable resistance, and the resistance of pulling upwards should be greater than pressing downwards. Resistance. If the resistance is unstable or there is no resistance, it may be due to lack of oil inside the shock absorber or damage to the valve components, and the parts should be repaired or replaced.


After confirming that the shock absorber is faulty or invalid, first check whether the shock absorber is leaking or there are traces of old oil leakage.


If there is no oil leakage from the shock absorber, please check whether the bushing is damaged, disconnected, cracked or peeled off. If the above inspections are normal, the shock absorber should be further disassembled to check whether the matching gap between the piston and the cylinder is too large, whether the cylinder is strained, whether the valve sealing is good, whether the valve clack and the valve seat are tightly attached, and shock absorption Whether the extension spring of the shock absorber is too soft or broken, it should be repaired by grinding or replacing the connection pin, connecting rod, connecting hole, rubber, and conditions of the shock absorber.


In addition, due to the collision of the shock absorber with the leaf spring, the frame or the axle, the damage or fall off of the rubber pad, the deformation of the shock absorber dust tube, the lack of oil, etc., the shock absorber will produce noise in actual use. You should find out Reason and repair it.


After the shock absorber is inspected and repaired, the performance test should be carried out on a special test bench. When the resistance frequency is 100±1mm, the resistance of the extension stroke and compression stroke should meet the requirements, indicating that the shock absorber is basically normal.

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