Crankshaft
The main parts of a crankshaft include the main journals, connecting rod journals (also called crankpins), crank web, counterweights, and thrust washers.
Other important components include the flywheel mounting flange, oil passages, and oil seals.
a crankshaft, a key component of internal combustion engines—including marine diesel engines like the Akasaka DM38AK.
🔧 What is a Crankshaft?
A crankshaft converts the reciprocating (up-and-down) motion of pistons into rotational motion that drives the ship’s propeller or generator.
⚙️ Key Parts Visible in the Image:
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Main Journals – Support the crankshaft and rotate within the engine block bearings.
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Crank Pins – Connect to the connecting rods from the pistons.
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Counterweights – Balance the crankshaft and reduce vibrations.
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Gear – Often drives the camshaft or auxiliary systems.
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Oil Passages – Small holes visible in the webs to allow for lubrication of moving parts.
🛠️ Why It’s Important:
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It’s the central rotating component of the engine.
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Must be precisely balanced to prevent vibrations and engine damage.
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Made of high-strength forged steel to withstand massive loads and stresses.