Crankshaft

Crankshafts, a strategic component in powertrain systems, convert the linear motion of pistons into rotary motion through connecting rods. The crankshaft is the heart of an internal combustion engine. A well-balanced crankshaft can significantly enhance acceleration, increase power output, reduce energy loss, and minimize engine vibrations.
Subjected to cyclic and repetitive loads, crankshafts require high fatigue strength, excellent wear resistance, and low thermal expansion. Consequently, crankshafts are typically made of medium-carbon steel or alloy steel containing chromium and nickel. Crankshafts can be manufactured through either casting or forging processes. The manufacturing process has a direct impact on the component's physical and mechanical properties.

Components of a Crankshaft:
• Front crankshaft: This houses the crankshaft gear, keyway, and pulley for accessories like the alternator and water pump.
• Connecting rod journals: These are the rotating surfaces where the connecting rods are attached.
• Main journals: These are the stationary surfaces where the main bearings are located, supporting the crankshaft within the engine block.
• Rear flange: This flange provides a mounting surface for the flywheel.
• Oil galleries: These channels distribute oil to lubricate the main and connecting rod bearings.
• Counterweights: These weights are strategically placed to balance the crankshaft and reduce vibrations.
• Thrust bearing surfaces: These surfaces allow for axial movement of the crankshaft while providing support.