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.
Mechanical Engineering
Machine Design
Difficulty: Easy
Choose an option
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ASum of base circle radii
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BSum of addendum circle radii
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CSum of pitch circle radii (i.e., (d₁ + d₂)/2)
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DSum of dedendum circle radii
Answer
Correct Answer: Sum of pitch circle radii (i.e., (d₁ + d₂)/2)
Explanation
ConceptFor 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 AnswerSum of pitch circle radii (i.e., (d₁ + d₂)/2)