Question 373Steam Plants - 1st Asst/Chief

70% to pass

What is the significance of pinion deflection in the operation of reduction gears?

APinion deflection causes unequal tooth loading.
BDeflection is minimal because a longer pinion is more rigid.
CDeflection causes excessive wear at the center of the pinion.
DDeflection causes excessive wear at both ends of the pinion.
AI Explanation

The correct answer is A) Pinion deflection causes unequal tooth loading. Explanation: Pinion deflection is an important consideration in the operation of reduction gears. When the pinion experiences deflection under load, it causes the teeth to become unevenly loaded across the face width. This unequal tooth loading can lead to accelerated wear and potential gear failure. Option A correctly identifies this as the key significance of pinion deflection. The other options are incorrect: Option B is incorrect because a longer pinion is not necessarily more rigid - the design must account for pinion deflection. Options C and D are incorrect because unequal tooth loading, not excessive wear at specific locations, is the primary issue caused by pinion deflection.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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