Belts and Pulleys

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Belts and Pulleys
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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

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Types of Belts
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..And More Belts
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Flat Belts
Transmits up to 5000kW of power
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Round Belts
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Construction of Belts
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Design Guidelines For Timing Belts

• Friction and Creep
• Tension Member Tensile Strength
• Flexibility
• Tooth shear strength

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Tension Member Tensile Strength
Allowable tensile load on belt cross section.
Dont forget about start up and acceleration.
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Flexibility and Fatigue
Drive without contraflexure
Drive with contraflexure
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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.
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Actual Load Distribution
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Pulleys
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All types

• Pick a pulley to match your belt
• Many types of materials (common
  Aluminum, Steel, Nylon)
• Consider load requirements

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Thank You!
All questions will now be directed to Dr. Chase