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For stress calculus, the spiral bevel gears are replaced with virtual cylindrical gears corresponding to the median frontal cones. The tension during the contact stress reaches its pitch in a point in the median area of the segment of singular gearing of the virtual cylindrical gear. The correspondence between the contact stress in the driving pole and the one in the point in which this stress is maximal is made through the mid-zone factor ZM-B. The main geometrical parameters which are taken into consideration in the analysis of the variation of the factor ZM-B are: the number of teeth of the pinion z1; the gear ratio u; the nominal coefficients of the radial profile shifts xc1,2; the median division inclination angle of the teething βm and the median width coefficient of the teething ψRm.

INFLUENCE OF GEOMETRICAL PARAMETERS ON THE MID-ZONE FACTOR ZM-B IN THE ELOID SPIRAL BEVEL GEARS