Modelling of Helical Gearing with Machining Errors for Load Calculation

A procedure for calculating load distribution on oblique contact lines of helical gear teeth is introduced. The effect of both machining errors and profile modification is accounted for. The procedure is based upon stiffness calculation and assumes that the sum of tooth deflection profile modification and machining errors at the pairs of contacting teeth are all equal. It is also assumed that the sum of the normal loads contributed by each pair of contracting teeth is equal to the total normal load. A detailed case study is outlined to explain the procedure. Experimental substantiation to prove the validity of the procedure is also introduced, where tooth fillet stresses were measured using strain gauges and the results were compared with those obtained from the procedure.