Design 5 - Worm Gear

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written 5.4 years ago by

yashbeer ★ 11k

A worm and worm wheel pair is to be designed for the following specifications, Power = 15kW, Worm speed = 960RPM, Velocity ratio = 28.

i) Find the number of start and number of teeth on the gear

ii) Select suitable material and find the axial module of the worm based on wear criteria

iii) Check design for bending and dynamic load

iv) Check the design for thermal conditions

Solution

Steps	Particulars	Detail
Step 1	Given data	Single stage worm gear box, Power ($P_m$)=15kW, $N_1$ = 960 rpm, i=28, design criteria- wear, checking criteria- bending strength and thermal analysis
Step 2	Assumptions	'1' or 'w'-driver (worm) and '2' or 'g'-driven (gear or wheel), external meshing, closed structure, commercially cut gears, using load and duty factor=1.5, module-m, face width (b)=10 m, FDI profile, normal pressure angle - $\alpha$ or $\alpha_{n}=20^{\circ}$ starts on worm=2, wheel rotation in one direction only, minimum temperature rise $\Delta t_{\min }=20^{\circ} \mathrm{C}$

Further steps are explained below.

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