Web Definition: Bearings
A bearing is a component used to reduce friction in a machine. Bearings may be classified broadly according to the motions they allow & according to their principle of operation. Common motions include linear & rotary. A linear bearing allows motion along a straight line, for example a drawer being pulled out & pushed in. A rotary bearing allows motion about a center, such as a wheel on a shaft or a shaft through a housing. Common kinds of rotary motion include both one-direction rotation & oscillation where the motion only goes through part of a revolution. sliding bearings, usually called bushings, journal bearings, or plain bearings ; rolling-element bearings such as ball & roller bearings; jewel bearings, in which the load is carried by rolling the axle slightly off-center; fluid bearings, in which the load is carried by a gas or liquid; magnetic bearings, in which the load is carried by a magnetic field ; & flexure bearings, in which the motion is provided by a load element which bends. An early type of linear bearing was an arrangement of tree trunks laid down under sleds.
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Timken
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Bearings Information
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Bearings In The Free Online Encyclopedia
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