Shock absorber common faults and maintenance

Common Faults and Maintenance In order to quickly attenuate the vibration of the frame and body and to improve the smoothness and comfort of the car, shock absorbers are generally installed on the vehicle suspension system.

Currently widely used in cars is a two-way drum shock absorber.

Shock absorbers are vulnerable parts in the use of automobiles. The shock absorbers work well and will directly affect the smooth running of the car and the life of other parts. Therefore, we should make the shock absorbers always in a good working condition. The following methods can be used to verify that the shock absorber is working properly.

1. Make the car stop on roads with poor road conditions for 10km, stop and touch the shell of the shock absorber. If it is not hot enough, there is no resistance inside the shock absorber and the shock absorber does not work. At this point, you can add appropriate lubricants, and then test, if the shell is hot, it is the lack of oil inside the shock absorber, should add enough oil; otherwise, the shock absorber failure.

2. Press the bumper firmly and release it. If the car has 2 or 3 jumps, the shock absorber works well.

3. When the car is moving slowly and braking suddenly, if the car vibrates more violently, there is a problem with the shock absorber.

4. Remove the shock absorber to erect it, and clamp the lower end of the connecting ring on the vise. Pull the damping rod several times. This time, there should be stable resistance. Resistance to pull up (restoration) should be greater than downward pressure. Resistance at the time, such as unstable or no resistance, may be due to lack of oil inside the shock absorber or damage to the valve parts. Repair or replacement of parts should be performed.

After determining that the shock absorber is defective or has failed, check the shock absorber for signs of oil leakage or old oil leakage.

Oil seal gaskets and gaskets were broken and damaged, and the fuel tank cap nuts were loosened. It may be the oil seal and the gasket failure. Replace the new seal. If you still can not eliminate the oil spill, you should pull out the shock absorber, if you feel there is a hairpin or different severity, and then further check the piston and cylinder bore is too large, the shock absorber piston rod is bent, the piston rod Whether the surface and cylinder are scratched or scratched.

If there is no oil leakage in the shock absorber, check the shock absorber connecting pin, connecting rod, connecting hole, rubber bush, etc. for damage, loosening, cracking or falling off. If the above inspection is normal, the shock absorber should be further decomposed to check whether the clearance between the piston and the cylinder is too large, whether the cylinder is damaged, whether the valve seal is good, and whether the valve flap and the valve seat are tightly adhered or not. Whether the extension spring of the shock absorber is too soft or broken, it is repaired or replaced according to the situation.

In addition, shock absorbers may malfunction in actual use. This is mainly due to shock absorbers colliding with leaf springs, frames, or shafts, damage or detachment of rubber pads, and deformation of the shock absorber dust caps. If it is caused by lack of reasons, the cause should be ascertained and repaired.

After the shock absorber is checked and repaired, the work performance test shall be conducted on a special test bench. When the resistance frequency is 100±1mm, the resistance of the extension stroke and the compression stroke shall meet the requirements. For example, the maximum resistance of the liberation CA1091 is 2156~2646N, and the maximum resistance of the compression stroke is 392~588N. The maximum resistance of the east windmill's extension stroke is 2450~3038N, and the maximum resistance of the compression stroke is 490~686N.

If there is no test condition, we can also use an empirical approach, that is, with an iron rod into the lower end of the shock absorber ring, with both feet on both ends of the foot, both hands hold the ring to pull back and forth 2 to 4 times, when There is a lot of resistance when pulling up. When you press down, you don't feel a lot of effort, and the resistance of stretching is restored compared with that before the repair. Without a sense of flight, it means that the shock absorber is basically normal.