The Design of Rolling Bearing Mountings

at least normal cleanliness (contamination factor V = 1),in most cases improved cleanliness (V = 0.5) or evenutmost cleanliness (V = 0.3) can be achieved. Thus,with a viscosity ratio of = 1, a cleanliness factor s is obtainedwhich is between 1 and 3.So dirt-protected transmission bearings (deep grooveball bearings or angular contact ball bearings) reachlives which are up to six times longer than those of unsealedbearings running in the "contaminated" transmissionoil.Machining tolerancesAt all bearing locations the inner rings are subjected tocircumferential load and the outer rings to point load.The bearing seats on the shafts are machined toj6...m6 and those in the housings to M6...P6 (lightmetal) and to J6...K6 (grey-cast iron), respectively. Thetighter bearing fits in light-metal housings take intoaccount the differences in the thermal expansion oflight metal and steel.49 FAG