Compared with similar oil-lubricated bearings, gas-lubricated bearings have a bearing capacity of about one to two orders of magnitude lower. According to the bearing capacity per unit area, oil-lubricated bearings are generally (0.5 to 2) MPa, while gas-lubricated bearings are only (0.02 to 0.04) MPa.
(2) Poor reliability
On the one hand, gas-lubricated bearings are prone to instability, and common air hammer vibrations and eddy instability occur. On the other hand, gas-lubricated bearings are stuck, hung or bitten.
(3) High manufacturing precision and expensive construction
Since the gas film is very thin, generally between a few micrometers and several tens of micrometers, the manufacturing precision of parts is required to be high, and the cost is increased. In addition, there are special process requirements such as processing spiral grooves, orifices and porous materials, which increases manufacturing difficulty and cost.
(4) demanding working conditions
Gas lubricated bearings require a high clean working environment and strict adherence to operating procedures to ensure proper bearing operation and no accidents. To this end, its widespread application and commercialization have been limited to a certain extent.
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