Transverse backlash deviation at working pitch circle

Indicates the deviation of the transverse backlash at working pitch circle of the individual instance of a planet from the nominal value.

The transverse backlash at working pitch circle j_wt is the length of the pitch circle arc by which each of the two gears can be rotated with the mating gear held in place from the contact of the right flanks until the contact of the left flanks. The following conversion to the normal backlash applies: j_bn = cos(α_wt) cos(β_b) j_wt