A bearing is a machine element that constrains relative motion between moving parts to only the desired motion. The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts. Bearings are classified broadly according to the type of operation, the motions allowed, or to the directions of the loads (forces) applied to the parts.
The term "bearing" is derived from the verb "to bear"; a bearing being a machine element that allows one part to bear (i.e., to support) another. The simplest bearings are bearing surfaces, cut or formed into a part, with varying degrees of control over the form, size, roughness and location of the surface. Other bearings are separate devices installed into a machine or machine part. The most sophisticated bearings for the most demanding applications are very precise devices; their manufacture requires some of the highest standards of current technology.
Other articles related to "bearings, bearing":
... There are many different types of bearings ... Friction Stiffness† Speed Life Notes Plain bearingRubbing surfaces, usually with lubricant some bearingsuse pumped lubrication and behave similarly to fluid bearings ... lifetime can be higher or lower than rolling element bearings ...
Famous quotes containing the word bearing:
“the whole sea become an entanglement of watery bodies
lost to the world bearing what they cannot hold. Broken,
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they cry out, failing, failing! their cries rising
in waves still as the skillful yachts pass over.”
—William Carlos Williams (18831963)