Question

Lewis Equation for bevel gear is corrected for

(a) variation in p.c.d.

(b) variation in tooth thickness

(c) taking care of axial thrust

(d) variation in torque acting on the tooth

This question was posed to me in class test.

My question is from Bevel Gears-1 topic in portion Toothed Gearing & Gear Trains of Machine Kinematics

Answer 1

Right choice is (a) variation in p.c.d.

Easy explanation: As radius of bevel gear varies along the width, the torque does not produce the same tangential force.