The variable spring rate is due to air spring geometry, internal air pressure, and changing effective area. Like Marsh Mellow® springs, Airmount® isolators have a variable spring rate. With an air spring, you have a more compliant support.The low natural frequencies and large travel of the air spring allow it to reduce the need for a large inertia mass. However, this is expensive, and is sometimes impossible without serious structural enhancement. This allows a relatively stiff isolator to do an acceptable job, and a more compliant one to do a good job. Most solid forms of isolation devices have historically been used with large inertia masses whose function is to reduce the amplitude of the vibration to within the ability of the isolator to comply to the motion. As a load shifts, air springs can be inflated or deflated to maintain a constant height, and therefore a level surface. An additional benefit is the ability to maintain a level surface with a compliant isolation system. For the designer this gives a generous tolerance to his calculations. An air spring can support loads varying by hundreds or even thousands of pounds with the same effective isolation. While it may be theoretically possible to have a coil spring as effective as an air spring at a particular load, it is impossible to construct a spring that has as wide a load range, or is as effective throughout the range. This gives the designer greater freedom to control the height of his equipment.Īir springs also have a unique capability unavailable in a solid spring: they are adjustable.
Installed heights for air springs are normally less than an equivalent coil spring.
FIRESTONE AIRMOUNT BEARING STYLE 224 WEIGHT FREE
This would necessitate a coil spring with an impossibly long free height. Air springs can be constructed to have spring rates as low as a coil spring with over 9 inches of static deflection.
While it may be theoretically possible to construct a solid isolator that has as low a spring rate as an air spring, it is often impossible practically. Airmount® Advantages Compact installed height
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