blob: fca93a04db527adc76aaf837dda37396cab2d0b1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
clc
//Example 18.3
//Strength of gear pair
P=12e3
N=1000
phi=14.5
m=6
b=60
Np=30
Ng=75
yp=0.101
S_bend_perm=100e6
surface_endurance=600e6
E=100e9
printf('Beam Strength:\n\tBoth gears are made of same material, hence the pinion is weaker\n')
Mt = (P*60)/(2*%pi*N)
Rp=(m*Np)/2
F=Mt/Rp
printf('F = s b Pc y = %0.3f N\n',F)
s=F/(b*1e-3*%pi*0.006*yp)
printf('Induced stress s=%0.3f MPa\n',s*1e-3)
printf('Induced stress < Permissible stress\n\tHence it is safe in bending\n\n')
printf('Wear Strength:\n')
printf('Fw=Dp b K Q\n')
Dp=2*Rp
K=(surface_endurance^2 * sind(phi) * ((1/E)+(1/E)))/1.4
Q=(2*Ng)/(Ng+Np)
Fw=Dp*1e-3*b*1e-3*K*Q
printf('\t=%0.3f N\n',Fw)
printf('The pair is strong in wear as well.')
//End of programme
|
