Figure 2: Changing the chordal length of the arc L of the active part of the Novikov gear in the process of running-in. L0: after running-in at the moment on the output shaft T2=1000 Nm; L1: as a result of running-in at the time of failure—a breakdown on the tooth of the tooth fillet at T2 = 3550 Nm with the operating time of 7.2⋅106 loading cycles; ρα: radius of curvature of the tooth; αк: pressure angle at the theoretical contact point; αρ: the minimum angle of the profile of the active part of the tooth.