A CI bevel gear pair, having pitch circle diameters of 80 mm and 100 mm, is used for transmitting 3 kW power at a pinion speed of 1200 r.p.m The tooth system is $14 1/2^0$ composite. If the static strength of pinion and gear is 56MPa, determine:

i) the module ii) the face width and iii) the surface hardness

Assume velocity factor accounts for dynamic load.

Mumbai University > Mechanical Engineering > Sem 7 > Machine Design 2

Marks: 14M

Year: Dec 2016

Given

PCD (d_1) = 80

PCD (d_2) = 100

P = 3000 W

N = 1200

$\alpha = 14.5^0$

$[\sigma_b] = 56MPa$

Solution:

$d_1 = m_tz_1$

where

No. of teeth on pinion = z_1

Assuming $\sum = 90^0$

$\delta_1 = tan^{-1} \bigg[\frac{sin \sum}{i + cos \sum}\bigg] = 38.659 \hspace{2cm} i …