Rotation of the gear under external torque. F_a = 8, D_r = 0.001 and $\varphi =0.15$, i.e., the gear is in the URS in the absence of external torque. (A) Distribution of angular velocity of the gear under different positive external torques. Over 100 independent runs are performed from random initial conditions. (B) Mean angular velocities as functions of external torque, which are averaged over time and independent runs of positive $({\langle \omega \rangle }_p)$ and negative $({\langle \omega \rangle }_n)$ rotations, respectively.