Reduction gears on main propulsion turbines...

Reduction gears on main propulsion turbines...

Question 1 of 270705eccefa1bacbc34ba4d471b3

Reduction gears on main propulsion turbines are double helical cut to __________.

Question 1 of 27070

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Q

Reduction gears on main propulsion turbines are double helical cut to __________.

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🔍 Key Concepts

• Double helical (herringbone) gears and how the two opposite helix angles interact • What axial (thrust) forces are created by single helical gears • The main design goals of reduction gears on main propulsion turbines (smooth power transmission, load sharing, alignment)

💭 Think About

• Think about what happens to the direction of force along the shaft when you have two gear sets with opposite helix angles machined together • Ask yourself: in a single helical gear, which direction does the tooth load tend to push the gear along the shaft, and what problem can that cause? • Which option directly addresses a known side‑effect of helical gears, rather than changing torque or gear size?

✅ Before You Answer

• Identify which choice is about axial thrust along the gear shaft, not torque or bending • Recall that reduction gears are mainly used to change speed and torque, so ask if they would be designed specifically to reduce torque • Verify which option relates to a known benefit of double helical (herringbone) gear design in marine reduction gears