The main thrust bearing directly positions...

🔍 Key Concepts

• Main thrust bearing function – how it transmits propeller thrust into the hull and controls axial movement of the shafting • Location of thrust bearing in relation to the reduction gear train (which element is on the same shaft line) • Difference between pinions and bull gear in a double‑reduction gear set (which turns faster/slower, which is on the output shaft)

💭 Think About

• Think about which gear element is on the same shaft as the main propulsion shaft that actually drives the propeller. • Ask yourself: the thrust from the propeller travels along which shaft, and which gear element is mounted on that shaft inside the reduction gear casing? • Which of these parts would need its axial (fore‑and‑aft) position controlled to protect clearances and alignment in the gear set?

✅ Before You Answer

• Identify which gear (bull gear vs pinions) is attached to the propeller (output) shaft in a main reduction gear. • Confirm which bearing in the system is specifically designed to take axial thrust, not just radial loads. • Before choosing, picture the gear train layout from turbine to propeller and trace the direction of thrust from the propeller back into the hull.

The main thrust bearing directly positions which part(s) of the main reduction gear?

Bull gear.

High-speed gear.

Low-speed pinion.

High-speed pinion.

🔍 Key Concepts

💭 Think About

✅ Before You Answer