Q:
From the following data:
Teeth on pinion: 30
Teeth on gear: 80
Pressure angle: 20°
Module: 12mm
Addendum: 10mm
Find the contact ratio.
Answer & Explanation
Answer: B) 1.75
Explanation: R = mT/2 = 480mm
r = mt/2 = 180mm
Addendum radius of pinion = 190mm
Addendum radius of gear = 490mm
Using the relation for length of path of approach
We get path of approach = 27.3mm
Path of recess = 25mm
adding both we get total length of path of contact
= 52.3mm
Length of arc of contact = length of path of contact / cos?
Contact ratio = Length of arc of contact/Pc
=1.75.
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