Automotive Bearing Introduction: one of the two members of the class of rolling, or so-called antifriction, bearings (the other is the roller bearing). The function of a ball bearing is to connect two machine members that move relative to one another in such a manner that the frictional resistance to motion is minimal. To minimize friction, the contacting surfaces in a bearing may be separated by a film of oil or gas; these are sliding bearings (see oil seal). In ball bearings and roller bearings, the surfaces are
There are six common principles of operation: sliding bearings, usually called sleeve bearings", or "plain bearings"; rolling-element bearings such as ball and 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; and flexure bearings, in which the motion is provided by a load element which bends. Rotary bearings are required for many applications, from heavy-duty use in vehicle axles and machine shafts, to precision clock parts. The simplest rotary bearing is the sleeve bearing, which is just a cylinder inserted between the wheel and its axle. This was followed by the roller bearing, in which the sleeve was replaced by a number of cylindrical rollers. Each roller behaves as an individual wheel.
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