High-quality shock absorbers for Renault trucks OE: 20906196

Working principle
Compression stroke: When the wheel approaches the vehicle body, the shock absorber is compressed and the piston moves downward. The volume of the lower chamber of the piston decreases and the oil pressure rises. The oil flows to the upper chamber of the piston through the flow valve. Due to the space occupied by the piston rod, the increased volume of the upper chamber is smaller than the reduced volume of the lower chamber. Some of the oil pushes open the compression valve and flows back to the oil storage cylinder. The throttling of these valves on the oil forms the damping force of the compression stroke. However, in this stroke, the damping force of the shock absorber is relatively small to fully exert the elastic effect of the elastic element and ease the impact.
Extension stroke: When the wheel is away from the vehicle body, the shock absorber is stretched and the piston moves upward. The oil pressure in the upper chamber of the piston rises. The flow valve is closed. The oil in the upper chamber pushes open the extension valve and flows into the lower chamber. Due to the presence of the piston rod, the oil flowing from the upper chamber is not enough to fill the increased volume of the lower chamber. A vacuum is generated in the lower chamber. The oil in the oil storage cylinder pushes open the compensation valve and flows into the lower chamber to supplement. The throttling effect of the valve plays a damping role on the suspension extension movement. Moreover, the damping force generated in the extension stroke is greater than that in the compression stroke, which can quickly absorb shocks.