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A worm gear set is designed to have pressure angle of 30° which is equal to the helix angle. The efficiency of the worm gear set at an interface friction of 0.05 is

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  1. 89.1%
  2. 77.9%
  3. 67.9%
  4. 57.9%

Answer (Detailed Solution Below)

Option 1 : 89.1%
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Detailed Solution

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Concept:

Interface friction, μ

Efficiency, 

Calculation:

Given, μ = 0.05, ϕ = 30°

tan λ = 0.948

cos ϕ = 0.866

Therefore, 

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