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

Transmits up to 5000kW of power

Flat Belts

Round Belts

Construction of Belts

Design Guidelines For Timing Belts

• 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