Shaft and bearing tolerance matching - bearing knowledge

FAG bearings and cooperation between shaft and bearing seat is by ISO tolerance and bearing inner hole tolerance Δ DMP and outer tolerance Δ DMP. The tolerance zone, ISO tolerance in the form of tolerance zone is defined. Tolerance zone is by their relative datum line distance ( Location = tolerance zone) And the difference in size ( = tolerance zone level) Decision. The tolerance zone position with letters ( Small said the hole tolerance, capital letter said shaft tolerance) 。 Rolling bearing is the most commonly used fit tolerance diagram 1, line 2, nominal diameter 3, 4, loose fit transition fit 5, interference fit 6, 7, trunnion bearing hole Δ DMP, bearing inside diameter tolerance Δ DMP, bearing outside diameter tolerance of shaft and bearing hole tolerance table with cylindrical hole of centripetal bearing diameter of axle tolerance 1) 2) easy to install C / P> 103). C / P> 124). C / P> 125). C / P> 10 thrust bearing shaft tolerance 1) The G7 used to made by gray iron bearing seat, if bearing outside diameter D> The difference in temperature between 250 mm and the outer ring and bearing & gt; 10K。 2) F7 bearing for grey cast iron manufacturing, if bearing outside diameter D> The difference in temperature between 250 mm and the outer ring and bearing & gt; 10K。 Thrust bearing housings tolerance special application, there may be deviation involves running accuracy, for example, the softness of the operation or working temperature. Running accuracy higher needs smaller tolerance, such as category 5 tolerance is higher than 6 levels of tolerance. If in the process of running FAG bearing inner ring temperature higher than axis, cooperate will become loose and exceed the allowable values. So you must choose tighter fit, for example with alternative k6 m6.