Reduction gears for main propulsion turbines...

🔍 Key Concepts

• How high-speed turbine shafts and reduction gears are normally lubricated on large main propulsion systems • Difference between boundary lubrication (like grease) and forced-pressure lubrication systems • Where lubrication is most critical in a reduction gear: gear tooth contact surfaces vs. general bearing areas

💭 Think About

• Think about the size, speed, and load of main propulsion reduction gears on a turbine-driven ship. Would simple passive methods (like rings or gravity) be reliable enough? • Which method would best ensure a continuous, positive supply of oil exactly where the gear teeth mesh under heavy load? • For a large, high-power reduction gear, which option looks like something you’d see in a pressurized lube oil system instead of a small auxiliary machine?

✅ Before You Answer

• Eliminate any option that sounds like low-tech, low-pressure, or intermittent lubrication that might be used only on small, slow-moving machinery. • Focus on the choice that reflects a forced, directed oil delivery system suitable for very high loads and high surface speeds at the tooth contact points. • Ask yourself: which choice describes oil being applied right where the gear teeth come into contact, not just generally in the housing or bearings?

Reduction gears for main propulsion turbines are lubricated by __________.

leakoff lines from the lube oil cooler

oil flinger rings mounted on the shaft

grease cups and gravity feed lines

spray nozzles at the gear meshing points

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🔍 Key Concepts

💭 Think About

✅ Before You Answer