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Fluid bearings
bearings, ball bearings, roller bearings, needle roller bearing, tapered roller bearing, spherical roller bearings, thrust bearings

Fluid bearings are bearings that support their loads solely on a thin layer of liquid or gas. They can be broadly classified into two types: fluid dynamic bearings and hydrostatic bearings. Hydrostatic bearings are externally pressurized fluid bearings, where the fluid is usually oil, water or air, and the pressurization is done by a pump. Hydrodynamic bearings rely on the high speed of the journal (the part of the shaft resting on the fluid) to pressurize the fluid in a wedge between the faces. Fluid bearings are frequently used in high load, high speed or high precision applications where ordinary ball bearings would have short life or cause high noise and vibration. They are also used increasingly to reduce cost.

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