Calculating Gear and Gearbox Torque

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    Gear Torque
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SUMMARY

This discussion focuses on calculating gear torque for various types of gear systems, specifically worm reduction gearboxes and helical gearboxes. The primary formula for torque calculation is τ = r * F, where τ represents torque, r is the radius, and F is the force applied. It is essential to consider the input torque from the motor and apply the reduction ratio to determine the output torque, factoring in a typical loss of 10% due to mechanical inefficiencies. For example, an input of 10Nm at 10 RPM with a gear radius doubling results in an output of 20Nm at 5 RPM.

PREREQUISITES
  • Understanding of basic torque calculations
  • Familiarity with gear mechanics and reduction ratios
  • Knowledge of motor specifications and performance metrics
  • Basic principles of mechanical efficiency and losses
NEXT STEPS
  • Research "Worm Gearbox Torque Calculations" for specific methodologies
  • Explore "Helical Gearbox Design Principles" for advanced insights
  • Learn about "Mechanical Efficiency Losses in Gear Systems" to optimize designs
  • Investigate software tools for "Torque Calculation in Mechanical Design" for practical applications
USEFUL FOR

Mechanical engineers, gear design specialists, and anyone involved in the calculation and optimization of torque in gear systems will benefit from this discussion.

yew105
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Somebody tell me how to calculate gear torque for gears and also for engineering gearbox like worm reduction gearbox and helical gearbox. Any software or hand book is available to find out gear torque and gearbox torque ?

Please help me.

Thanks

Satish Patel
 
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Well, it depends on your input torque. If you have a motor diving your gear, look up the torque coming out of the motor (or calculate it) and then multiply that torque by the reduction ratio. Also, you will lose torque just by the nature of the mechanics. You could factor in a loss of 10% to be safe.

Otherwise, torque for a gear is

τ = r * F
torque = radius * Force


If you have a input of 10Nm of torque at 10 RPM, and your output gear has twice the radius of the input gear, your Torque will double and your speed will halve. You will end up with 20Nm of torque and 5 RPM.
 

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