On main turbine propulsion units, gear-type...

On main turbine propulsion units, gear-type...

Question 1 of 270705eccefa1bacbc34ba4d471e7

On main turbine propulsion units, gear-type flexible couplings are generally used between the __________.

Question 1 of 27070

Q

On main turbine propulsion units, gear-type flexible couplings are generally used between the __________.

🔍 Key Concepts

• Main turbine train layout: high‑pressure turbine, low‑pressure turbine, pinions, quill shafts, reduction gears, thrust bearing, and line shafting • Purpose of gear‑type flexible couplings: to transmit torque while allowing small misalignment and axial movement • Where misalignment and thermal growth are greatest in a steam turbine reduction gear unit

💭 Think About

• Picture the full power train from the turbine rotor all the way to the propeller shaft. At which interface is small angular or axial misalignment most likely and most critical to absorb? • Which two shafts need some flexibility between them because one is directly connected to the turbine rotor (subject to heat and growth) and the other is part of the geared reduction train? • For each option, ask: is this normally a rigid gear mesh, a bearing support point, or a location where a flexible coupling would be installed?

✅ Before You Answer

• Confirm which components are normally connected by rigid gear meshes (pinion to gear) rather than flexible couplings • Identify where the thrust bearing is located in a typical main turbine propulsion train (is a flexible coupling usually placed right at the thrust bearing?) • Verify which shaft (rotor, pinion, quill) is designed specifically to help accommodate misalignment and flexibility in the reduction gear system