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Concept
Air suspension
Summary
Air suspension is a type of vehicle suspension powered by an electric or engine-driven air pump or compressor. This compressor pumps the air into a flexible bellows, usually made from textile-reinforced rubber. Unlike hydropneumatic suspension, which offers many similar features, air suspension does not use pressurized liquid, but pressurized air. The air pressure inflates the bellows, and raises the chassis from the axle.
Air suspension is used in place of conventional steel springs in heavy vehicle applications such as buses and trucks, and in some passenger cars. It is widely used on semi trailers and trains (primarily passenger trains).
The purpose of air suspension is to provide a smooth, constant ride quality, but in some cases is used for sports suspension. Modern electronically controlled systems in automobiles and light trucks almost always feature self-leveling along with raising and lowering functions. Although traditionally called air bags or air bellows, the correct term is air spring (although these terms are also used to describe just the rubber bellows element with its end plates).
On 7 January 1901 the British engineer Archibald Sharp patented a method for making a seal allowing pneumatic or hydraulic apparatus described as a "rolling mitten seal", and on 11 January 1901 he applied for a patent for the use of the device to provide air suspension on bicycles. Further developments using this 1901 seal followed. A company called Air Springs Ltd started producing the A.S.L. motorcycle in 1909. This was unusual in having pneumatic suspension at front and rear - rear suspension being unusual in any form of motorcycle at that time. The suspension units were similar to the normal girder forks with the spring replaced by a telescopic air unit which could be pressurised to suit the rider. Production of the motorcycles ceased in 1914.
On 22 January 1901 an American, William W. Humphreys, patented an idea - a 'Pneumatic Spring for Vehicles'. The design consisted of a left and right air spring longitudinally channeled nearly the length of the vehicle.
Official source
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