1. Flat-and Round-Belt Drives
Muhannad Al_Waily_Machines Systems Design
Belts and Chain
Flat-and Round-Belt Drives
Belts
Flat Metal Belts
'V-Belts'
Roller Chain
Wire Rope

2. Flat-and Round-Belt Drives
Muhannad Al_Waily_Machines Systems Design
Flat-and Round-Belt Drives
open-belt drive
Crossed belt
Forced Analysis
The centrifugal force ' dS '
forces radially
forces tangentially

3. Muhannad Al_Waily_Machines Systems Design
' Fc ' is found as follows
The belt speed
The weight w of a meter of belt is given in terms of the weight density
Total Forces in belt

4. Muhannad Al_Waily_Machines Systems Design
The transmitted power
nominal power as
' Hd = Hnom . Ks . nd
These effects are incorporated as follows
For polyamide and urethane belts, use 'Cv=1 '

5. Muhannad Al_Waily_Machines Systems Design
The steps in analysis a flat-belt drive can include
Find ' exp(f.) ' from belt-drive geometry and friction
From belt geometry and speed find ' Fc '
From ' T = Hnom . Ks . nd / (2.π.n) ' find necessary torque
From torque ' T ' find the necessary
Find ' F2 '
find the necessary initial tension ' Fi '
Check the friction development

6. Muhannad Al_Waily_Machines Systems Design
dip (m)
L = center-to-center distance (m)
weight per foot of the belt (N/m)

7. Flat Metal Belts as thin as ' 0.05 mm ' and as narrow as ' 0.65 mm '
Muhannad Al_Waily_Machines Systems Design
Flat Metal Belts
as thin as ' 0.05 mm ' and as narrow as ' 0.65 mm '
A bending stress
Axial stress
The largest tensile stress
The smallest tensile stress

8. The selection of a metal flat belt can consist of the following steps
Muhannad Al_Waily_Machines Systems Design
The selection of a metal flat belt can consist of the following steps
Find ' exp(f.) ' from geometry and friction
Find endurance strength
Allowable tension
Choose
Check frictional development

9. Muhannad Al_Waily_Machines Systems Design
'V-Belts'
Pitch length ' Lp ' and the center-to-center distance ' C '

10. Muhannad Al_Waily_Machines Systems Design
allowable power

11. The centrifugal tension ' Fc '
Muhannad Al_Waily_Machines Systems Design
In a V-belt the effective coefficient of friction
sheave groove angles of ' 300, 340, and 380 '
The Gates Rubber Company declares its effective coefficient of friction to be ' ' for grooves
The design power
The centrifugal tension ' Fc '

12. Muhannad Al_Waily_Machines Systems Design
These equivalent tensions are added to ' F1 '

13. Muhannad Al_Waily_Machines Systems Design
Roller Chain
The chain velocity ' V '
number of sprocket teeth
chain pitch, m
sprocket speed, rev/s
The maximum exit velocity of the chain
the minimum exit velocity

14. Muhannad Al_Waily_Machines Systems Design
the speed variation

15. 'American Chain Association (ACA)'
Muhannad Al_Waily_Machines Systems Design
'American Chain Association (ACA)'
the nominal power ' H1 ', link-plate limited
the nominal power ' H2 ', roller-limited
number of teeth in the smaller sprocket
sprocket speed, rev/min
pitch of the chain, mm
( 29 ) for chain number ' 25, 35 '; ( 3.4 ) for chain ' 41 '; and ( 17 ) for chains ' '
The constant ( ) becomes ( ) for no. ' 41 ' lightweight chain
The allowable power ' Ha '

16. Muhannad Al_Waily_Machines Systems Design

17. Muhannad Al_Waily_Machines Systems Design

18. Muhannad Al_Waily_Machines Systems Design
The approximate length of the chain ' L ' in pitches
The center-to-center distance ' C ‘,
For a deviation
The maximum speed (rev/min) for a chain drive is limited by galling between the pin and the bushing

19. Muhannad Al_Waily_Machines Systems Design
Wire Rope
the radius of curvature '  ', we can substitute the sheave radius 'D/2'

20. Muhannad Al_Waily_Machines Systems Design
'bearing pressure'
The graph does show that the rope will have a long life if the ratio ' p/Su ' is less than (0.001)
The factor of safety in fatigue
Some guidance in strength of individual wires
Improved plow steel (monitor)
Plow steel
Mild plow steel

21. Muhannad Al_Waily_Machines Systems Design
The wire rope tension ' Ft ' due to load and acceleration/deceleration is
weight at the end of the rope (cage and load), N
number of wire ropes supporting the load
weight/foot of the wire rope, N/m
suspended length of rope, m
maximum acceleration/deceleration experienced, m/s2
The static factor of safety ' ns '