1. Check whether the shock absorption of the car is smooth: press it by hand, whether it can be pressed to the end, and whether there is any irregularity in the pressing process.
2. Look at the damping of the shock absorber: it cannot be pressed like a spring by hand, it will go down when it is pressed, and it will bounce back when it is loosened. It should be slowly compressed and then bounced back slowly.
3. Look at the tightness of the shock absorber: after springing back, see if there are oil stains on the chrome-plated surface, that is, if there is a rainbow under the light; and then if there are oil stains around the sealing ring.
4. Look at the manufacturer's brand and workmanship.
Hydraulic
Hydraulic shock absorbers are widely used in automobile suspension systems. The principle is that when the frame and the axle reciprocate and the piston reciprocates in the cylinder of the shock absorber, the oil in the shock absorber shell will repeatedly flow from the inner cavity through some narrow pores into the other. An inner cavity. At this time, the friction between the liquid and the inner wall and the internal friction of the liquid molecules form a damping force against vibration.
Inflatable
Inflatable shock absorber is a new type of shock absorber developed since the 1960s. Its structural feature is that a floating piston is installed in the lower part of the cylinder, and a closed air chamber formed by the floating piston and one end of the cylinder is filled with high-pressure nitrogen. A large-section O-ring seal is installed on the floating piston, which completely separates oil and gas.