+1 vote
in Machine Kinematics by (38.0k points)
Common contact ratio of a pair of spur pinion and gear is

(a) Less than 1·0

(b) Equal to 1

(c) Between 2 and 3

(d) Greater than 3

This question was posed to me in an international level competition.

Asked question is from Reverted Gear Train topic in portion Toothed Gearing & Gear Trains of Machine Kinematics

1 Answer

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by (87.2k points)
Correct option is (c) Between 2 and 3

The best explanation: The ratio of the length of arc of contact to the circular pitch is known as contact ratio i.e. number of pairs of teeth in contact. The contact ratio for gears is greater than one. Contact ratio should be at least 1.25. For maximum smoothness and quietness, the contact ratio should be between 1.50 and 2.00. High-speed applications should be designed with a face-contact ratio of 2.00 or higher for best results.

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