Belts and Pulleys
Why Belts and Pulleys
• Transmitting power (long distances)
• Conveyer belts
• May simplify the cost and design of the
machine
• Increase machine life (damping vibrations)
• Vacuum your floor
Types
of
Belts
..And
More
Belts
Flat Belts
Transmits up to 5000kW of power
Round Belts
Construction of Belts
Design Guidelines For Timing
Belts
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•
•
•
Friction and Creep
Tension Member Tensile Strength
Flexibility
Tooth shear strength
Tension Member Tensile Strength
Allowable tensile load on belt cross section.
Don’t forget about start up and acceleration.
Flexibility and Fatigue
Drive without contraflexure
Drive with contraflexure
Tooth shear strength
The more belt teeth in
mesh attainable, the
better the load is
spread.
The shear strength
calculation is based
on the smallest pulley
in the configuration.
Actual Load Distribution
Pulleys
All types
• Pick a pulley to match your belt
• Many types of materials
(common: Aluminum, Steel, Nylon)
• Consider load requirements
Thank You!
All questions will now be directed to Dr. Chase