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The interference between a given pinion tooth and a gear tooth can be avoided by using 1. smaller pressure angle 2. larger pressure angle 3. Less number of teeth on the gear for a pinion with predefined number of teeth 4. More number of teeth on the gear for a pinion with predefined number of teeth Which of the above statements are correct?

The interference between a given pinion tooth and a gear tooth can be avoided by using 1. smaller pressure angle 2. larger pressure angle 3. Less number of teeth on the gear for a pinion with predefined number of teeth 4. More number of teeth on the gear for a pinion with predefined number of teeth Which of the above statements are correct? Correct Answer 2 and 4

Explanation:

Interference involute gear: If the tip of the pinon will touch the non-involute portion of the gear then involute to non-involute connection will be there, consequently law of gearing will not be satisfied, and this condition is known as interference in the involute gears.

Selection of a larger pressure angle can eliminate interference. Larger pressure angle gives smaller base circle. Due to this more tooth profile becomes involute. In this case, the tip of the tooth of one gear will not have a chance to contact the flank of the other gear on its non-involute portion.

By increasing the number of teeth addendum of the tooth decreases which decreases the addendum circle radius, which decrease the interference. 

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