What is a crankshaft and what does it do?

The engine crankshaft runs at the bottom of the car's motor, converting the vertical motion of the piston into horizontal rotating motion, which ultimately drives the wheels through the gearbox.

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In today's cars, the crankshaft consists of evenly distributed "crankshafts" (there are four crankshafts in a four-cylinder engine, as shown below) connected to the bottom of the piston by connecting rods. 

These "strokes" deviate from the axis of the crankshaft, which is responsible for the energy of rotation.

The crankshaft is connected to the engine by large bearings at each end. It is connected to the flywheel and through it to the clutch.

When the clutch engages, the rotating energy of the crankshaft is transferred through the gearbox and differential to the drive shaft, which is connected to the wheels and thus creates the ability of the car to move.

★Camshaft and crankshaft

01)The camshaft is located near the top of the engine and is driven by the crankshaft through a timing chain or belt.

02)The camshaft (there can be up to four per engine, although the crankshaft diagram below shows two) has CAM angles along its length, working in conjunction with the valve mechanism (including the push rod, valve tappet, valve spring, valve and tappet or rocker arm) to 03)promote air and fuel into the combustion chamber and exhaust gas after the done power stroke portion of the internal combustion engine cycle.

03)The camshaft's rotating CAM convex Angle opens and closes the engine valve. The size and shape of the bump varies from engine to engine to control how long and how much the valve opens. The more valves, the more air and fuel is drawn in, and the more exhaust gas is emitted, increasing engine power.

04)The engine crankshaft is located near the bottom of the engine (as shown below) and is connected to the piston by a connection channel - the combustion process causes the piston to move down causing the crankshaft to rotate.

★What's wrong with the crankshaft?

01)The crankshaft is an extremely complex and well-honed engineering component that includes more than just the crank stroke. Key components include crank pin, oil channel, keyway, spindle neck and flywheel mounting flange.

02)But engine cranks also include many built-in counterweights and balances designed to keep vibration while spinning to a minimum.

03)Any such vibration is amplified and can damage the bearings on which the crankshaft is mounted as well as the connecting rods and pistons.

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