Air springs
(Rubber­ air springs/­Membrane air springs)

Air springs are used for highly effective vibration isolation and structure-borne sound insulation for a wide variety of machine types, optical and electronic devices, laser systems as well as vehicle, engine and transmission test benches.
Air Springs

General Information

The use of Bilz BiAir® air spring isolators with active level control maintains the correct level of machines or foundations. The level control and adjustment is entirely automatic.
The pressure in the air springs is appropriately adjusted by pressurising or venting in response to load changes. This keeps the isolating effect constant in all events.

Unlike steel springs air springs do not transmit structure borne sound.

Air springs

Rubber air spring isolators for highly effective shock and vibration isolation

FAEBI® rubber air springs are used for the highly effective insulation of machines, apparatus and aggregates from shocks, vibrations and structure borne noise. The element comprises of a bellshaped rubber form made from high-grade elastomer.

The constructive design enables highly effective vertical vibration isolation without the disadvantage of large horizontal deflection. Overloading of the element due to a sudden pressure drop is virtually impossible.

On request, the system is also available with mechanical or electronic level control (see “Accessories” section). The base plate is equipped with an anti-slip plate to eliminate the need for floor anchoring. The FAEBI® rubber air spring is also available in a stainless steel version for use in outdoor areas (e.g. air-conditioning technology).

Applications for rubber springs

Perfectly suited for source insulation of fast running presses, forging hammers and other machines and aggregates with highly dynamic disturbance forces. Passive isolation of measuring and test equipment as well as highly accurate machine tools.

Shock and vibration isolation with rubber air springs

The natural frequency of the rubber air spring in the vertical direction is between 3 and 14 Hz depending on the static load. The maximum spring deflection in response to a pulse load is up to 15 mm depending on the type and size of the air spring.

Air pressure control

FAEBI® elements can be equipped with an air pressure control on request. The air pressure monitor will indicate if the air pressure falls below the required setpoint.

Bilz level control systems

The level control is a significant component to ensure the optimal function of an air spring system. The level control can correct load changes that cause undesired deflection of the air elements or inclination of the machine in a machine or system equipped with air springs.

Detailaufnahme Bilz Luftteder
Air springs by Bilz for highly effective vibration isolation
Detailfoto Bilz Luftfeder
Air spring (detail)
Detail Bilz Membran Luftfeder
Bilz air spring (detail)
Air Springs

Membrane air springs for effective vibration isolation and damping

With our BiAir® air spring isolator, the air volume is enclosed by a thin-walled, flexible and pressure-resistant rolling membrane. The piston sits on the membrane and is pressed into place by the air volume.

This design allows for highly effective vibration isolation.

Applications for membrane air springs

For highly effective receiver isolation of measuring and testing machines, inspection and production machines in the semiconductor industry, optical and electronic devices, laser systems, precision machining machines, as well as vehicle, engine and gearbox test benches etc.

How the membrane air springs work

In order to simultaneously achieve the highest degree of damping possible, the air space is divided into two chambers (load/damping volume) connected by a bypass. An adjustable throttle valve is used from the outside to set the flow cross-section in the connecting line of the bypass to the desired damping. A degree of damping of up to 15% is possible.

General information regarding selection and application of our BiAir® membrane air springs
  • The maximum permissible movement amplitude in the horizontal plane is between approximately 1 to 2 mm depending on the size of the air spring.
  • In addition to the standard solutions listed here we also offer numerous air springs with a larger stroke and lower natural frequency.
  • Powder coated air springs are also available in other RAL colours on request.
  • Permissible temperature range: -20 °C to +80 °C
  • Damage to the rolling membrane due to overpressure is virtually impossible through the use of additional safety valves or a mechanical piston stroke limit.
Illustration describing the elements of a Bilz BiAir membrane air spring

Schematic illustration of the elements structure of a membrane air spring

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