Reduction gears for main propulsion turbines...

Reduction gears for main propulsion turbines...

Question 1 of 2707066636ef128f7522a1c5218b0

Reduction gears for main propulsion turbines are lubricated by __________.

Question 1 of 27070

Q

Reduction gears for main propulsion turbines are lubricated by __________.

🔍 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?