Bear­ing tol­er­ances

Car (South Africa) - - TECH -

Bear­ings are man­u­fac­tured to tight tol­er­ances down to a thou­sandth of a mil­lime­tre de­pend­ing on the bear­ing size and type. A term called “in­ter­nal clear­ance” points to the rel­a­tive move­ment of the outer to the in­ner ring. In­ter­est­ingly, the in­ter­nal clear­ance may be greater than the op­er­a­tional clear­ance spec­i­fied for the bear­ing. This is be­cause the in­ter­fer­ence fit lo­cat­ing the bear­ing ei­ther ex­pands the in­ner ring or com­presses the outer ring (or both), thereby re­duc­ing the in­ter­nal clear­ance. The op­er­at­ing heat may also lead to ther­mal ex­pan­sion that, in turn, can in­flu­ence the in­ter­nal­clear­ance di­men­sion.

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