In the case of a spin-resistant-differential (Borg-Warner) shown in the figure above, the frictional moment is transferred over two cone brakes, each linked with an output shaft-on the common differential housing and thus between both outputs. The braking force is produced on the one hand by a constant spring load and on the other hand, depending on the input torque, by the forces of tooth interference between planetary wheels and axle cone wheels. Thus the locking torque consists of a fixed and a load-dependent share.
The locking effect of locking worm differentials is based on an increased tooth friction during the rotational compensating motion between the output shafts. This can be achieved using worm gears with a leading angle that is adjusted for high tooth face friction and by an increased number of gear wheel pairs. Using this principle, locking values up to 90% are achieved in the load-independent friction moment.