Valve train is one of the essential system in the operation of the engine. I think you must always hear about DOHC, VVT-i or VTEC when talking about the car. All this terms basically come from the valve train of the engine. The function of the valve train is to control the air-fuel mixing into and out of the cylinder.
In modern engine, the basic components in valve train are camshaft, cams and of course the valves. The valves’ function is to allow the air-fuel mixture to enter or exit the cylinder. The movement up and down of the valves will be controlled by the rotation of the cams. The rotation of the cams will somehow controlled by the camshaft because all the cams will be attached to the camshaft.
The camshaft will connect to the engine’s crankshaft by the belt or drive chain to ensure the timing of the movement of the valves matching with the movement of the piston. Below are the pictures to make you all more understand about the valve train.
Valve
Camshaft
Valve train operation
Source:
1. http://auto.howstuffworks.com/engine4.htm
2. http://en.wikipedia.org/wiki/Valvetrain
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