Marine Propeller Shaft Flange Design

In summary, the conversation discussed the design of a flange for a marine duty gear installation. The gear is suitable for shafts up to 4" in diameter, but the user needs to use a 4.5" shaft. They are seeking guidance on how to determine the required flange length and thickness. The flange is made of high strength steel and the shaft material is Aquamet22 with a tensile strength of 87,000psi. Additional information such as the type of shaft, exact diameter, fit to the flange, loads, gear type, and fastening method is needed for a complete design.
  • #1
Destiny
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First of all this is for marine duty. Iam using a Gear which supplies the shaft flange good for shafts up to 4" in diameter but iam restricted to use a 4.5" shaft. In this case i have to design the flange .. iam struck here could anyone of you please guide me ..
how to find out the flange length and thickness required..?
the flange is made of high strength steel with material strength of 800 to 950 N/sq.mm. where as the shaft material is Aquamet22 and has a tensile strength of 87,000psi
Please Help?
 
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  • #2
ping @jrmichler . This is a legit question from 2005, can you help?
 
  • #3
That's a heavy duty gear installation. We need a sketch of the setup, plus more information:

Is the shaft cold rolled, rough turned, or smooth turned where the flange will be installed?
What is the exact shaft diameter to the nearest 0.001"? Need to measure to +/- 0.0005" or better.
Is the flange clamp fit, or shrink fit to the shaft?
What are the loads - gear pitch diameter, RPM, and horsepower?
Is the gear spur or helical? If helical, what is the helix angle?
How is the gear fastened to the flange? If by a bolt circle, what is the bolt circle diameter and number of bolts? Does the gear manufacturer specify the bolt grade? If so, what is it?
Is the gear piloted on the shaft or the flange? Show in the sketch.
Are there shock loads when the clutch is engaged, or is it a smooth engagement?
 
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1. What is a marine propeller shaft flange?

A marine propeller shaft flange is a component of a ship's propulsion system that connects the propeller shaft to the engine or motor. It is typically a disc-shaped piece of metal with holes for bolts or studs to secure it in place.

2. Why is the design of a marine propeller shaft flange important?

The design of a marine propeller shaft flange is important because it affects the performance and efficiency of the ship's propulsion system. A well-designed flange can minimize vibration and stress on the shaft, reduce drag, and improve the overall performance of the ship.

3. What factors should be considered when designing a marine propeller shaft flange?

When designing a marine propeller shaft flange, factors such as the size and power of the engine, the size and shape of the propeller, the material and strength of the shaft, and the operating conditions of the ship should all be taken into account. The flange must also be designed to withstand the forces and torque generated by the propeller.

4. How is the material for a marine propeller shaft flange chosen?

The material for a marine propeller shaft flange is typically chosen based on its strength, corrosion resistance, and compatibility with the shaft and propeller materials. Common materials used include stainless steel, bronze, and aluminum. The material must also be able to withstand the marine environment and any potential impacts or collisions.

5. What are some common design considerations for marine propeller shaft flanges in different types of ships?

The design of a marine propeller shaft flange may vary depending on the type of ship it is used in. For example, flanges for high-speed vessels may need to be designed for reduced drag and increased strength, while flanges for large cargo ships may need to accommodate larger and heavier propellers. Other design considerations may include the location of the flange on the shaft, the number of bolts or studs used, and the need for additional components such as a thrust collar or keyway.

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