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Mechanical Engineering QUESTION #2457
Question 1
The law of conjugate gear-tooth action (the fundamental law of gearing) states that for constant angular velocity ratio, the common normal at the point of contact must:
  • Always pass through the center of the smaller gear (pinion)
  • Always intersect the line of centers at the same fixed point — the pitch point P✔️
  • Be parallel to the line of centers
  • Be perpendicular to the tooth profile at all times
Correct Answer Explanation
The fundamental law of gearing: the common normal to the mating tooth surfaces at the contact point must always pass through the pitch point P (fixed point on the line of centers).