Question

Lewis equation in spur gear is applied:

• A. Only to the pinion
• B. Only to the gear
• C. To weaker of pinion or gear
• D. To stronger of pinion or gear

Hint:

In gear design, always apply the Lewis equation to the weaker of the pinion or gear to ensure that the weakest component is strong enough to handle the load.

Answer 1

The Correct Option is C

The Lewis equation in spur gears is used to determine the strength of the gear teeth, and it is applied to the weaker of the pinion or gear. This is because the pinion or gear that is weaker (with a lower number of teeth or smaller diameter) is more likely to fail under the applied load. The equation helps in calculating the bending stress and ensuring that the gears are designed with sufficient strength to withstand the applied forces.