What is shock Absorber

vertical direction during driving, and the elastic elements in the suspension system will vibrate accordingly when impacted. Therefore, it is necessary to install shock absorbers in parallel with the elastic elements in the suspension to attenuate vibration and improve the ride comfort of the car
The hydraulic shock absorber is usually used in the automobile suspension system. Its working principle is that when the frame or the body and the axle are subject to relative motion due to vibration, the piston in the shock absorber moves up and down, and the oil in the shock absorber flows from one cavity to another repeatedly through different gaps. At this time, the friction between the hole wall and the oil and the internal friction between the oil molecules consume the vibration energy, and form a damping force on the vibration, so that the vehicle vibration energy is converted into oil heat energy, which is then absorbed by the shock absorber and distributed to the atmosphere. When the factors such as the oil channel load surface remain unchanged, the damping force changes with the increase or decrease of the relative motion speed between the frame and the axle, and is related to the number and size of the oil viscosity holes.
Elastic elements and shock absorbers are responsible for buffering and damping. If the damping force is too large, the vibration attenuation becomes too fast, which makes the buffering effect of the elastic elements of the suspension worse, and even damages the shock absorber connectors and the frame. Generally, the car may be in three states during driving; The first is to drive on a good road, where elastic elements are required to play a full role; The second is that the shock absorber plays a leading role in the case that the vehicle bears medium strength vibration; The third case is that the vehicle is subject to severe vibration, which is closely related to the tire grounding. In order to work in coordination with elastic elements under the above three conditions, the shock absorber must meet the following requirements:
(1) During the suspension 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 elastic role of the elastic elements and mitigate the impact. At this time, the elastic element plays a major role;
(2) During the suspension stretching stroke (the axle and the frame are far away from each other), the damping force of the shock absorber should be large to reduce the vibration quickly. At this time, the shock absorber plays a major role;
(3) When the relative motion speed between the frame or body and the axle is too high, the shock absorber is required to increase the fluid flow freely to keep the damping force within a certain limit, so as to avoid the frame or body bearing excessive impact load.
The hydraulic shock absorber widely used in automobile suspension system is a cylindrical shock absorber, which is also called a two-way shock absorber because it can reduce vibration in both compression and extension strokes.
The working principle of the two-way acting shock absorber. The outer steel cylinder is a dust cover, and the upper part is connected with the frame (body) by a ring. The steel cylinder in the middle is an oil reservoir, with a certain amount of shock absorber oil inside, and a ring at the lower part is connected with the axle. The innermost steel cylinder is a working cylinder filled with shock absorber oil. In the inner part of the working cylinder, the piston rod, which is integrated with the dust cover and the upper ring, is used to fix the piston at its bottom end. The piston is equipped with an extension valve and a flow valve, and the lower base of the working cylinder is equipped with a compression valve and a compensation valve. In order to make the shock absorber meet the working requirements, the springs of the flow valve and the compensation valve are relatively soft, and smaller oil pressure can be opened or closed. The springs of the compression valve and the extension valve are relatively hard, and can only be opened when the oil pressure increases to a certain extent; As long as the oil pressure drops slightly, the valve will be closed immediately
The working process of the two-way acting cylinder shock absorber is as follows: when the stroke is compressed, the shock absorber is compressed, the car wheels move closer to the body, the piston in the shock absorber moves downward, the volume of the lower chamber decreases, and the oil pressure increases. Most of the oil flows into the upper chamber after flushing the flow valve. Since the upper chamber is occupied by the piston rod, the increased volume of the upper chamber is smaller than the decreased volume of the lower chamber, so the other part of the oil flows back to the oil reservoir by pushing the compression valve. When the oil passes through the valve hole, the shock absorber is stretched and the wheels are far away from the body. At this time, the piston of the shock absorber moves upward, the oil pressure in the upper chamber rises, the flow valve is closed, and the oil hydraulic opening valve in the upper chamber flows 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 solution deposit in the lower chamber, prompting the lower chamber to produce a certain degree of vacuum. At this time, the oil in the oil reservoir pushes the compensation valve open and flows into the lower chamber for supplement. The throttling of these valves has a damping effect on the suspension during stretching movement.
As the spring stiffness and pre tension force of the stretching valve are designed to be greater than those of the compression valve, under the same force, the total load area of the stretching valve and the corresponding normal gap channel is less than the total load area of the compression valve and the corresponding normal gap channel, which makes the damping force generated by the stretching stroke of the shock absorber greater than the damping force generated by the compression stroke, so as to meet the requirements for rapid vibration reduction.
In addition, the suspension systems of some models use inflatable shock absorbers, adjustable damping force shock absorbers and inflatable shock absorbers. The lower part of the cylinder barrel of the shock absorber is equipped with a floating piston, and a closed gas chamber is formed between the floating piston and one end of the cylinder barrel, with high-pressure nitrogen inside. The floating piston (gas sealing piston) is covered with oil, and the piston is equipped with a large section O-ring, which is used to completely separate oil and gas. The movement speed of the working piston changes, resulting in different damping forces. Both the stretching valve and the compression valve are composed of a group of spring steel sheets with the same thickness and different diameters arranged from large to small.
Compared with the two-way acting cylinder shock absorber, the inflatable shock absorber has the following advantages:
(1) The floating piston reduces the system of a set of valves, simplifying the structure and reducing the weight.
(2) As the shock absorber is filled with high pressure nitrogen, it can reduce the vibration of the wheel under sudden impact and eliminate noise.
(3) As the working cylinder and piston diameter of the gas filled shock absorber are larger than those of the two-way acting cylinder shock absorber under the same conditions, its damping is greater and its working reliability is stronger.
(4) The high-pressure gas and oil in the pneumatic shock absorber are separated by the floating piston, which eliminates the oil emulsification.
The disadvantage of gas filled shock absorber is that it has high oil seal requirements, complex gas filling process, and is difficult to maintain. When the cylinder cylinder is changed due to large external impact, it cannot work.
2.What Shock Absorber you sell ?
We Have Volvo Scania Benz DAF MAN Iveco Renault Shock Absobers
Volvo Number Have as follows ： 21243048 21172373 20960913 21137458 3198859 1076860 20721166 3172986 5010130797 5010629414 20906196 20399204 20453258 20889136 21111942 3198837  1075076 1075077 1629725 20883347 20593743 25379046 5010316210 281700001960 7420374543 1079151 20374543 20585556 21172387 1622227 20960909 3198849 3986315 21111925 3198836 3092136 21739593 22040665 20709798
21243048 21862164 7421243060 0021909816 21430905 21171973 21430901 21821033 23670438 21170510 21739591 23111320 23111328 1498862 2438272 20443547 5001857903 0019191245 1622227 3198849 3986315 290493 21171975 22128971 CB0208 1609553 1094138 1137028 1137029 1599623 1608949 1609000 21170510 21739591 23111320 23111328 3092136 3198836 21111925 1076860 20721166 3172986 312 694 20712868 21171973 CB0211
21171973 CB0211 5010269605 5010460113 5010615880 7420840318 20840318 CB0046
1075478 CB0008 22040665 21739593 CB0175 21170510 21739591 23111320 23111328
20960907 21111925 3092136 3198836 1620086 1585586 1629483 1628136 1628103 1629483 1628136 1628103 3037213 1075077 1075076 1629725 1075077 1075076 1629725
20571686 20717431 5010630004
Benz Shock Absorber Number 9613101555 9603107555 9603100755 9613100955 9603106655 9603106755 9603108955 9603109055 9613101055 9428902219 9428902819 9428905418 9428905418 A9428902219 A9428902819 281700002010 9428901819 9428903119 9438900919 9438901119 9438901419 A9428901819 9428905418 9428902019 9428905019 9428905119 A9428902019 A9428905019 0053239900 0063238300 A0053239900 A0063238300
0053239900 0063238300 A0053239900 A0063238300
0053267400 0063260100 0063261100 A0053267400
0053267400 0063260100 0063261100 A0053267400
0063260500 9428905419 9428905519 9438900119 9438900319
9408900819 9408900919 9408901319 9408901519 9583170403
9438903019 9438902919 9428905419 9428905519 9438900119 9438900319 290 248
9408903819 3758900419 3758900919 3758901119 9408904719 9583171003 9428906119 311 664 9428905419 9428905519 9438900119 9438900319 290 248
9428903619 9428901619 9428901719 9428903619 9428904019 313 76
9428906119 311 664 9428904719
0063201530 0053260900 124 567 9603106955 9603109255 9613101255
9603106955 9603109255 9613101255
0019191245 81623856047 5001857903 1498862 20443547 2438272
9428902819 9428902219 131 850 9438904619 9438904919 312 651
9428905419 9428905519 9438900119 9438900319 290 248
9428903619 9428901619 9428901719 9428903619 9428904019 313 76

9603100755 9603107555 9613101555 A9603100755 A9603107555
9603100755 9603107555 9613101555 A9603100755 A9603107555
9428900219 9428906019 9438903919
9438902919 9438903019 A9438902919 A9438903019
9428900419 9428901519 9438902419 A9428900419
9428905419 9428905519 9438900119 9438900319
3758900519 9408903919 9408904119 9583172103
9428903819 9428903919 9438901219 9438901319 A9428903919
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