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Shock absorber principle

Source: 互联网    Release time:2014-12-18
Vibration generated due to elastic element is affected by the impact of the vehicle suspension system, in order to improve the ride comfort, suspension and the elastic element arranged in parallel for shock absorber, damping vibration, vehicle suspension system with damper is hydraulic shock absorber, its working principle is when the frame (or body) and the bridge between vibration relative motion inside, the shock absorber piston moves up and down, oil shock absorber cavity will be repeated from a cavity through different pore flow into another chamber. At this point the hole wall and the friction between oil and oil internal friction between the molecules on the vibration damping force, so that the automobile vibration energy into heat oil, and then absorbed by the absorber and emitted into the atmosphere. In the constant factors section oil channel and etc., the damping force with the frame and axle (or wheel) or relative velocities between, and with oil viscosity.
Shock absorber components and flexibility with ease to assume the task of the impact and vibration, the damping force is too large, will make the suspension elastic deteriorate, even make the shock absorber connecting piece is damaged. Because the surface to this contradiction adjustment of elastic element and shock absorber.
(1) in the compression stroke (vehicle axle and frame close to each other), small damping force, so as to give full play to the elastic effect of the elastic element, mitigate the impact. Then, the elastic element plays the major role.
(2) in the suspension extension stroke (axle and frame away from each other), shock absorber damping force should be large, rapid damping.
(3) when the axle (or wheel) and the relative velocity between the axle is too large, demand shock absorber can automatically increase the liquid flow, so that the damping force is always maintained within certain limits, in order to avoid too much to bear the impact load.
Widely uses in the automobile suspension system is the shock absorber, and in the compression and expansion stroke can play a damping effect is called a double acting shock absorber, and the use of new shock absorber, which comprises a pneumatic shock absorber and resistance adjustable shock absorber.
Explain the bidirectional adjustable shock absorber principle. During the compression stroke, refers to the automobile wheel moved closer to the body, shock absorber under compression, at this time the shock absorber piston 3 moves downwards. The piston chamber volume reduction, higher oil pressure, oil flows through the flow valve 8 to above the piston cavity (cavity). Superior is a piston rod 1 occupied part of the space, thus increase the volume of less than on the cavity vena reduced volume, part of the oil liquid and then push the compression valve 6, back into the oil storage cylinder 5. The valve on the oil saving formed by compression damping force of the suspension movement. The shock absorber in the expansion stroke, the wheel is equivalent to away from the body, shock absorber under tension. When the shock absorber piston moves upward. The piston cavity pressure increases, the flow valve 8 is closed, the upper chamber oil pushing expanding valve 4 into the inferior vena cava. As the piston rod cavity flow exists, since the oil is not enough to fill a cavity increased volume, the inferior vena generates a vacuum, then the oil storage cylinder push valve 7 into the vena supplement. Due to the valve of the throttle effect on suspension play a damping effect in stretching exercises.
Because the stiffness and preload design expanding valve spring is greater than the compression valve, at the same pressure, expansion valve and the corresponding Changtong slit channel area is less than the sum of the compression valve and corresponding Changtong slit channel cross-sectional area of the total. This makes the shock absorber damping force of the expansion stroke produces greater than compression stroke damping force, achieve the rapid damping requirements.
For the attenuation of accelerating frame and body vibration, to improve vehicle ride comfort (comfort), in the vehicle suspension system with internal shock absorber most car.

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