Question

The type of gears used to connect two non-parallel non-intersecting shafts are

(a) spur gears

(b) helical gears

(c) spiral gears

(d) none of the mentioned

I had been asked this question in an online quiz.

Enquiry is from Toothed Gearing in portion Toothed Gearing & Gear Trains of Machine Kinematics

Answer 1

Correct choice is (c) spiral gears

Explanation: The two non-intersecting and non-parallel i.e. non-coplanar shaft connected by gears. These gears are called skew bevel gears or spiral gears and the arrangement is known as skew bevel gearing or spiral gearing. This type of gearing also have a line contact, the rotation of which about the axes generates the two pitch surfaces known as hyperboloids.