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Air Bearing Features

Air Bearing Features

2022-08-29

The features of Air Bearing

① Very low friction

Since the viscosity of gas is much lower than that of liquid, the viscosity of air at room temperature is only one-fifth thousandth of that of No. 10 mechanical oil, and the frictional resistance of the bearing is proportional to the viscosity, so the frictional resistance of the gas bearing is lower than that of the liquid lubricated bearing.


② Wide range of applicable speeds

The gas bearing has low friction resistance and low temperature rise. When the speed is as high as 50,000 rpm, the temperature rise does not exceed 20-30 °C, and the speed is even as high as 1.3 million rpm. Aerostatic bearings can also be used at very low speeds, even zero speeds.


③ Wide temperature range

The gas can maintain a gaseous state in a wide temperature range, and its viscosity is little affected by temperature (the viscosity increases slightly when the temperature increases, such as the temperature increases from 20 ° C to 100 ° C, the air viscosity increases by 23%), therefore, the gas The applicable temperature range of the bearing can reach -265℃ to 1650℃.


④ Low carrying capacity

The load-carrying capacity of a hydrodynamic bearing is proportional to its viscosity, and the load-carrying capacity of a gas hydrodynamic bearing is only a few thousandths of that of a hydrodynamic bearing of the same size. Due to the compressibility of the gas, the bearing capacity of the gas dynamic pressure bearing has a limit value, and the load per unit projected area can only be added to 0.36MPa.


⑤ High machining accuracy requirements

In order to improve the bearing capacity and air film stiffness of gas bearings, smaller bearing clearances (less than 0.015 mm) are usually used than liquid lubricated bearings, and the accuracy of parts needs to be improved accordingly.


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