What causes the shock absorber to have resistance when compressed but not rebound?

[VonEmily]

The reasons why the shock absorber has resistance when compressed but does not rebound are as follows: Since the rebound force of the shock absorber is provided by the shock-absorbing spring absorbing road vibrations and impacts, once the shock-absorbing spring is damaged, it will greatly affect the rebound force of the shock absorber. The following is a related introduction to shock absorbers: 1. Working principle: The working principle is that when the frame (or body) and axle vibrate and undergo relative movement, the piston inside the shock absorber moves up and down, and the oil in the shock absorber chamber repeatedly flows from one chamber to another through different pores. 2. Purpose: To accelerate the attenuation of frame and body vibrations and improve the driving smoothness (comfort) of the car, most car suspension systems are equipped with shock absorbers.