Calculate output torque on Helical Gears:

A gear train contains helical gears the pitch radii of the driver, intermediate and driven gear are respectively 5 cm, 8 cm and 6 cm. The normal pressure angle is 20^o and a helix angle of 30^o. The input torque is as 15000 N.

Solution

It is given:

Input torque = 15000 N

Radii r₂ = 5 cm, r₃ = 8 cm and r₄ = 6 cm

Transmitted force= 15000 /5 = 3000 N

2 Drivers RH

3 Idler LH

4 Followers RH

(ii)

Figure 8

Figure 8(i) illustrates the sense of rotation of several gears and head of the threads Figure 8(ii) shows pitch circles of the three gears. The several components are also illustrate

The output torque T₄ = 3000 × 6 = 18000 N

Action of axial components at pitch circles provide increase to resistance torque around

Y-axis

The influence of these couples around the OY-axis is to turn each shaft end that results in added reactions at the bearings in the direction of X-axis.