AIRSUSTECH Air Springs Assembly Cross OEM No. Twthill 1998301 Double Convoluted Industrial Air Shocks
ALTERNATIVE NO
Twthill 1998301
Histeer 10316
Watson&Chalin AS-0089
Watson&Chalin AS 0089
Watson&Chalin AS0089
Reyco 19983-01 (21AR,74AR)
Goodyear 2B14-383
Goodyear 2B14 383
Goodyear 2B14383
Goodyear 578923356
Firestone W01-358-7557
Firestone W01 358 7557
Firestone W013587557
Firestone WO1-358-7557
Firestone WO1 358 7557
Firestone WO13587557
Firestone w01-358-7557
Firestone w01 358 7557
Firestone w01 358 7557
Firestone w013587557
Contitech FD 530-35 530
Contitech FD 530 35 530
Contitech FD530-35 530
Contitech FD530 35 530
Triangle 6412
Triangle 4530
Specifications and Detailed Technical Parameters: 2B7557
Nut/blind nut
Top plate screw (nut) teeth: M18×1.5, M12×1.75
Screw (nut) teeth of the bottom cover plate: 2×M12×1.75
Air hole/air inlet/air fittings
Air hole/air inlet: 1/4NPT
The air hole/air inlet is combined with the screw nut
Cover plate
Top plate diameter: 289 mm
Bottom cover diameter: 289mm
The screw center distance of the bottom: 158mm
Bell rubber bellows
Rubber Bellow Diameter: 353mm
Stroke: 104mm to 391mm
Bumper block/bumper block
With bumper block
Belt loop/Belt loop
With one piece of belt loop
Min. pressure: 0 bar
Return force to min.height: ≤400N
Overall weight with clamped plates: 7.7kg
Vibration isolation - dynamic characteristic values
Design Height H: recommended 285mm, minimum 265mm
| Pressure p[bar] | 3 | 4 | 5 | 6 | 7 | 8 | Vol. V[l] |
| Force(Load) [KN] | 18.7 | 25.1 | 31.6 | 38.2 | 44.6 | 51.2 | 23.5 |
| Spring rate [N/cm] | 1770 | 2250 | 2700 | 3180 | 3640 | 4100 |
| Natural frequency [Hz] | 1.5 | 1.5 | 1.5 | 1.4 | 1.4 | 1.4 |
Pneumatic application-static characteristic values
Force F[KN]
| Pressure p [bar] | 3 | 4 | 5 | 6 | 7 | 8 | Vol. V [l] |
| Height H[mm] | 320 | 14.9 | 20.4 | 25.9 | 32.0 | 37.6 | 43.7 | 26.0 |
| 280 | 18.5 | 24.5 | 31.0 | 38.1 | 45.0 | 51.7 | 23.2 |
| 240 | 21.1 | 28.0 | 35.5 | 43.3 | 50.3 | 57.9 | 20.5 |
| 200 | 23.1 | 30.7 | 38.5 | 47.1 | 54.8 | 62.8 | 17.5 |
| 160 | 24.8 | 33.1 | 41.3 | 50.4 | 58.4 | 67.2 | 14.1 |
| 120 | 26.2 | 34.8 | 43.4 | 52.9 | 61.5 | 70.6 | 10.8 |
Locking and unlocking systems for airbags
1. Airbag locking system If the airbag is not connected to the air source to control the height or has no air valve device, it is called a locking system. The system uses a fixed amount of gas as the elastic medium. A certain amount of gas is enclosed in the system, and the amount of gas remains unchanged under pressure and rebound.
2. Unlocking system of airbags
Unlocked systems for airbags are the most commonly used today. The air bag is connected to the air source through a height control or other air valve device, which is called an unlocked system. Whether at rest or under pressure, the bladder maintains relatively the same volume at the design operating height. Under the fixed condition of the height valve, the load force and elastic coefficient change with the change of the pressure of the fixed gas. With this system, the additional pressurized gas maintains the height of the air bag even as the air bag load changes. In this way, in the case of changes in load, since the system can keep the volume of the airbag unchanged, the natural vibration is more stable than the locking system. In short, the natural vibration frequency of the system will not change when the load changes.
Advantages of airbags
1. The elastic coefficient of spring expansion can be controlled;
2. Adjustable load carrying capacity;
3. Easy to achieve height control;
4. Reduce friction;
5. The load changes, but the natural frequency is basically unchanged.
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