To make the frame and body vibrations decay rapidly, improve vehicle ride comfort and comfort, the automotive suspension systems generally are equipped with shock absorbers, now widely used in the car is double-acting telescopic shock absorber.
Automobile shock absorber is used in the process of wearing parts, shock absorbers work is good or bad, will directly affect the stability and other parts of the life of the cars, so we should make shock absorbers always in good working condition. The following methods can test whether the work of a good shock absorber.
1. make cars on the road conditions are poor road after driving 10km parking, touch damper housing, if not hot enough, indicating no internal shock resistance, shock absorber does not work. In this case, can be added to a suitable oil, and then to test if the case of fever, compared with internal shock absorber oil, should add enough oil; otherwise, indicating shock absorber failure.
2. Firmly press the bumper, then release, if the car has 2 or 3 times jump, then the shock absorber works well.
3. When the car slowly driving and emergency braking, if the car more intense vibration, indicating a problem with the shock absorber.
4. Remove the shock absorber to its upright, and the lower end of the connecting ring folder on the vise, pull compression damping lever several times, then there should be a stable resistance, pull up resistance should be greater than the downward pressure when resistance, such as resistance to unstable or no resistance, may be internal shock absorber valve parts lacking fuel or damage should be repaired or replaced.
In determining the shock absorbers have a problem or failure, you should first check whether the damper oil spills or traces of old oil spills. Seal gaskets, gasket rupture damaged oil storage cylinder head nut loose.
If it is found leaking, tighten the nut oil cylinder head first, if the damper is still leaking, there may be oil seals, sealing washers failure, should be replaced with new seals. If you still can not eliminate the leak, damping rod should be pulled out, if there was not a time card or severity, further check the clearance between the piston and cylinder is too large, whether the damper piston rod bending, piston rod whether the cylinder surface and scratch or pull marks.
If the damper does not leak phenomenon, should check the shock absorber connection pin, connecting rod, connecting hole, rubber bushings and other damage, sealing off, break or fall off place. If these were normal, should be further decomposed shock absorbers, check with the gap between the piston and cylinder is too large cylinder with or without injury, the valve seal is good, the valves and valve seat are tight fitting and Save Dilatation shock absorber spring is too soft or broken, take grinding way to repair or replace parts according to the situation.
In addition, the shock absorber in actual use will be beep of failure, which is mainly due to the shock absorbers and leaf springs, frame or shaft collide, damage or loss pads and shock absorbers dust tube deformation, oil lack of other causes, reasons should be identified, to be repaired.
After the inspection, repair the shock absorber should work in a special test rig performance test, when the resistance frequency at 100 ± 1mm, which stretch stroke stroke and compression resistance should be specified. As liberation CAl091 done stroke the biggest obstacle for 2156 ~ 2646N, the biggest obstacle is the compression stroke 392 ~ 588N; Dongfeng car done stroke the biggest obstacle for 2450 ~ 3038N, the biggest obstacle is the compression stroke 490 ~ 686N. If there are no experimental conditions, we can also use an empirical approach, which uses an iron bar penetrating the lower end of the inner damper rings, slam it ends with both feet, both hands, pull the rings back and forth 2-4 times, when pulled up great resistance, it does not feel effortless downward pressure, but compared to some recovery and repair before stretching resistance, no air-way sense, it indicates that the damper normal.