Effect of Temperature on Aero-Engine Bearing Measurement
Bearings are the core of aero-engines,which require high precision in the assembly process,and their measurements are generally carried out at 17℃ to 23 ℃.By measuring the bearings at different temperatures,the effect of temperature on the measured values of inner and outer rings and radial clearance of the bearings is investigated.By measuring the inner and outer rings of the bearing at two temperatures,18.8℃ and 22.8℃,it was found that the measured values of the inner and outer rings of the bearing changed very little at the two temperatures.This phenomenon can be explained by the fact that the material of the inner and outer rings of the bearing is 8Gr4Mo4V,and the material of the standard part is GrWMn.The linear expansion coefficients of the two materials are similar,so that the bearings and the standard parts expand or contract quite a lot during the constant temperature process.In 18.8 ℃ and 22.8 ℃ two temperatures,the bearing radial clearance measurement value difference is very small,this is due to the bearing inner and outer ring and rolling element material is all 8Gr4Mo4V,radial clearance measurement value with the amount of change in temperature can be simplified as △d=dα△T,linear expansion coefficient α(12.5 × 10-6(/℃))is very small,when the temperature change is not too big,the radial clearance change is very small.
bearingmeasuring temperatureradial clearancelinear expansion coefficientinner and outer diameters
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