The outer packaging of authentic truck parts is of good quality. The writing on the packaging box is clear and the overprinting color is bright. Some manufacturers also put their own marks on the accessories. Some important components, such as generators, distributors, fuel injection pumps, etc., are also equipped with instruction manuals, certificates of conformity and inspector's stamps to guide users in correct use and maintenance. Be careful not to buy counterfeit and shoddy products.
Hydraulic shock absorbers are widely used in automobile suspension systems. The principle is that when the frame and the axle reciprocate relative to each other and the piston reciprocates in the cylinder barrel of the shock absorber, the oil in the shock absorber shell will repeatedly flow from the inner cavity through some narrow pores to the other. a 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 on the vibration.