# Worm gears – tooth force analysis a) The tangential force components, axial and radial acting on worm and gear are shown in Fig. 15.4

b) The normal angle 90 shaft, the worm tangential force equal to the force axial gear and vice versa. c) The worm and gear or radial separation forces also identical, If the power and the speed of either the input or output is known, can the tangential force acting on the member from equation. 1. In Fig . 15.4, the worm drive member rotating clockwise right hand.

2. instructions shown force can easily be visualized by considering the worm as a right-turning screw so as to pull the “nut” (worm gear tooth) toward the “one screw”.

3. Force mixtures can further instructions manual worm and rotation direction similarly visualized.

Thrust Force Analysis.

The thrust direction applied to conditions worm and worm wheel drive variety shown in Fig. 15.6 Corresponds to the angle of screw thread thread λ the pressure angle φn of the worm. We can apply the effect, efficiency, and self-locking equations of power just a worm screw and gear set. These equations derived below with reference to the worm and gear geometry. 15.9 Figs.15.7 show in detail that the forces acting on he gear. The force components normal tooth shown solid. Components of the force of friction shown by

Fig.15.9 Directions show rotation torque but with the reverse direction (ie drive, gear). Then contact shifts to the other side of the gear tooth, and reverses the normal burden.

.15.7 show in detail that the forces acting on he gear. The force components normal tooth shown solid. Components of the force of friction shown by

The friction force is always oriented to oppose the sliding motion. The worm drive rotating clockwise: Combining Eqns. (15:12) to (15:13), we have: Combining Eqns. (15:12) to (15:14) and (15:13) to (15:14), we have:  