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The path of contact of two gears in a mesh is 50 mm and the pressure angle is 45°. The module is 8 mm. Find the contact ratio of these two gears.

The path of contact of two gears in a mesh is 50 mm and the pressure angle is 45°. The module is 8 mm. Find the contact ratio of these two gears. Correct Answer 2.8

Arc of contact = Path of contact/cos φ = 50/cos 45° = 70.71 mm Contact ratio = Arc of contact/ Circular pitch = Arc of contact / πm = 70.71/(πx8) = 2.8.

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