2.
Driven/ Driver
30/10 = 3
15/30 = .5
Multiple the two gear ratios in the system to get the overall gear ratio.
3 * .5 = 1.5
Exercise I:
A.
Part Number
Gear Type
Number of
Teeth
Pitch
diameter
Diametral
Pitch
Gear Ratio
H2472
Spur
72
3
24
3:4
H2496
Spur
96
4
24
L112Y
Miter
24
1.5
16
1:1
L112Y
Miter
24
1.5
16
H1616R
Helical
16
1
16
1:2
H1632L
Helical
32
2
16
Speed
Gear Pair 1
Actual Velocity
Ratio
Theoretical
velocity ratio
N1
N2
5
6.0
3.75
1.60
1.33
7
7.5
5.5
1.36
1.33
9
9.75
7.6
1.28
1.33
Speed
Gear Pair 2
Actual Velocity
Ratio
Theoretical
velocity ratio
N1
N2
5
4.00
4.00
1.00
1.00
7
5.50
5.50
1.00
1.00
9
7.25
7.25
1.00
1.00
Speed
Gear Pair 3
Actual Velocity
Ratio
Theoretical
velocity ratio
N1
N2
5
4.00
2.00
2.00
2.00
7
5.50
3.00
1.83
2.00
9
7.25
3.80
1.91
2.00
B.
1. What is the service factor for the given application?
1.25
2. What is the overall drive ratio?
RPM Driver/ RPM driven
1750/47= 37.23:1
3. If a belt drive is used for secondary reduction, what should be the ratio of the worm gear reducer? Belt
drive ratio is 1.24.
Overall Drive Ratio/ Belt drive ratio
37.23/1.24 = 30.02
4. What is the actual torque at the reducer output shaft?
Torque at head shaft/ Belt drive ratio
2000/1.24= 1612.9
5. What is the normal torque?
Actual Torque * Service Factor
1612.9 * 1.25 = 2016.13
6. What is the selected size of the reducer based on the mechanical rating?
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- Fall '18
- gear, Gear Trains, speed reducers
