Question

What is the name of angle which is present between line of action and common tangent to the pitch circles?

(a) Helix angle

(b) Lead angle

(c) Pitch angle

(d) Pressure angle

The question was asked during an interview.

I would like to ask this question from Terminology of Gear Tooth topic in chapter Measurement and Testing of Gears of Engineering Metrology

Answer 1

Correct answer is (d) Pressure angle

Easiest explanation: The angle between the line of action and the common tangent to the pitch circles is called as pressure angle. The standard values of pressure angle are 14.5 degree and 20 degree. Pressure angle is generally represented by φ.