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The crankshaft acts as the engine’s backbone for motion conversion. As the pistons move up and down during combustion, the crankshaft’s offset crankpins transform this linear motion into rotational motion. This rotation drives the transmission, ultimately moving the wheels.
A well-balanced crankshaft is critical for engine smoothness, performance, and longevity. Modern engines use precision-engineered crankshafts with counterweights and oiling systems to handle high RPMs and torque loads efficiently.
The crankshaft is a key rotating component in an internal combustion engine. It converts the reciprocating motion of the pistons into rotational motion, which ultimately powers the vehicle’s drivetrain.
Main Journals – Cylindrical surfaces that sit in the engine block bearings, allowing the crankshaft to rotate smoothly.
Crankpins (Rod Journals) – Offset sections where connecting rods attach, converting piston movement into rotation.
Crank Throws – The sections between main journals and crankpins that create the offset necessary for rotation.
Counterweights – Balance the crankshaft to reduce vibration and ensure smooth engine operation.
Flange – The rear end of the crankshaft connects to the flywheel or flexplate.
Material Strength – Usually made of forged steel or cast iron to withstand high stress and torque.
Oil Passages – Internal channels provide lubrication to bearings and moving parts.
Surface Treatment – Often ground and polished to reduce friction and wear.
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