Question

Which of the following is true for Length of path of contact?

(a) Sum of path of recess and path of approach

(b) Difference of path of approach and path of recess

(c) Twice the arc of approach

(d) Twice the path of recess

This question was posed to me in quiz.

My question is taken from Path of Contact in section Toothed Gearing & Gear Trains of Machine Kinematics

Answer 1

The correct answer is (a) Sum of path of recess and path of approach

Explanation: The path of contact is given by the sum of Length of path of approach and length of path of recess. Numerically it is dependent on pitch radius, addendum radius and the sine of pressure angle.