When is gear designed for bending?

Q. If (σ_b x Y)_pinion > ( σ_b x Y)_gear then ________ is designed for bending.
- Published on 19 Oct 15

a. pinion

b. gear

c. both a. and b.

d. none of the above

ANSWER: gear

Krishna Murthy G -Posted on 27 Mar 21
Nice explanation mam thank you so much
Twabona Dennis -Posted on 14 Apr 18
This is interesting
Sravanthi -Posted on 25 Sep 15
According to Lewis equation, beam strength of gear and pinion is calculated using the formula,
F_b = σ_b b mY
Face width and module for pinion and gear are same, so product of σb & Y is considered to decide the weaker member between pinion and gear. If pinion and gear are made of same material pinion is always weaker as Lewis factor for pinion is less than gear

If (σ_b x Y)_pinion > ( σ_b x Y)_gear, gear is weaker in bending. Hence gear is designed for bending

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