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Involute gears: centre distance of a meshing pair State the relationship that gives the centre distance between two meshing involute gears. Choose the correct expression.

Difficulty: Easy

Sum of base circle radii
Sum of addendum circle radii
Sum of pitch circle radii (i.e., (d₁ + d₂)/2)
Sum of dedendum circle radii

Correct Answer: Sum of pitch circle radii (i.e., (d₁ + d₂)/2)

Explanation:

Concept
For standard involute gears in mesh, the geometric centre distance equals the sum of the operating pitch circle radii (equivalently, (d₁ + d₂)/2). Base, addendum, and dedendum circles do not determine the centre distance directly.

Final Answer
Sum of pitch circle radii (i.e., (d₁ + d₂)/2)

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