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How many bearings are there?

How many bearings are there?
Update Time:2018-08-23
Plain bearing
consisting of a shaft rotating in a hole. There are several specific styles: bushing, journal bearing, sleeve bearing, rifle bearing, composite bearing.
Rolling-element bearing
in which rolling elements placed between the turning and stationary races prevent sliding friction. There are two main types
Ball bearing
in which the rolling elements are spherical balls
Roller bearing
in which the rolling elements are cylindrical,taper and spherical rollers
Jewel bearing
a plain bearing in which one of the bearing surfaces is made of an ultrahard glassy jewel material such as sapphire to reduce friction and wear
Fluid bearing
a noncontact bearing in which the load is supported by a gas or liquid
Magnetic bearing
in which the load is supported by a magnetic field
Flexure bearing
in which the motion is supported by a load element which bends.
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