What’s the function of Risidual Pressure Copper Air Valve on the air suspension?
In the suspension system, vibration is generated due to the impact of the elastic element. In order to improve the ride comfort of the car, a shock absorber is installed in parallel with the elastic element in the suspension. In order to damp the vibration, the vibration damper used in the automobile suspension system is mostly hydraulic vibration damping. The working principle is that when there is relative movement between the frame (or body) and the axle due to vibration, the piston in the shock absorber moves up and down, and the oil in the shock absorber cavity repeatedly passes through a cavity through different The pores flow into another cavity. At this time, the friction between the hole wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, so that the vibration energy of the car is converted into the heat energy of the oil, and then absorbed by the shock absorber and emitted into the atmosphere. When the oil channel cross-section and other factors remain unchanged, the damping force increases and decreases with the relative movement speed between the frame and the axle (or wheel), and is related to the oil viscosity.
The shock absorber and the elastic element undertake the tasks of buffering shock and damping. Excessive damping force will deteriorate the elasticity of the suspension and even damage the connection parts of the shock absorber. Therefore, the contradiction between the elastic element and the shock absorber must be adjusted.
(1) During the compression stroke (the axle and the frame are close to each other), the damping force of the shock absorber is small, so as to give full play to the elasticity of the elastic element and mitigate the impact. At this time, the elastic element plays a major role.
(2) During the extension of the suspension (the axle and the frame are far away from each other), the damping force of the shock absorber should be large to quickly damp the vibration.
(3) When the relative speed between the axle (or wheel) and the axle is too large, it is required that the shock absorber can automatically increase the fluid flow, so that the damping force is always kept within a certain limit to avoid being subjected to excessive shocks Load.
The cylinder type shock absorber is widely used in the automobile suspension system, and it can play the role of vibration damping in both compression and extension strokes. It is called a two-way type shock absorber, and there is a new type of shock absorber, which includes an inflatable damper Vibrator and resistance-adjustable shock absorber.
Description of the working principle of the two-way cylinder shock absorber. During the compression stroke, it means that the vehicle wheel moves closer to the body and the shock absorber is compressed. At this time, the piston 3 in the shock absorber moves downward. The volume of the lower chamber of the piston decreases, the oil pressure increases, and the oil flows through the flow valve 8 to the chamber (upper chamber) above the piston. The upper chamber is occupied a part of the space by the piston rod 1, so the increased volume of the upper chamber is smaller than the reduced volume of the lower chamber, and a part of the oil then pushes open the compression valve 6 and flows back to the oil storage cylinder 5. The oil saving of these valves creates the damping force of the suspension under compression.
When the shock absorber stretches the stroke, the wheel is equivalent to being away from the body, and the shock absorber is stretched. At this time, the piston of the shock absorber moves upward. The oil pressure in the upper chamber of the piston rises, the flow valve 8 closes, and the oil in the upper chamber pushes the expansion valve 4 into the lower chamber. Due to the existence of the piston rod, the oil flowing from the upper chamber is not enough to fill the increased volume of the lower chamber, which mainly creates a vacuum in the lower chamber. At this time, the oil in the oil storage cylinder pushes the compensation valve 7 to flow into the lower chamber. supplement.
медный воздушный клапан для ремонта амортизатора Mercedes Benz W220 с пневматической подвескойDue to the throttle effect of these valves, the suspension has a damping effect during the extension movement. Since the stiffness and pretension of the expansion valve spring are designed to be greater than that of the compression valve, under the same pressure, the sum of the channel load area of the expansion valve and the corresponding constant-through slot is smaller than the total cross-sectional area of the compression valve and the corresponding constant-through slot channel. This makes the damping force of the expansion stroke of the shock absorber greater than that of the compression stroke, meeting the requirement of rapid vibration damping.