What is a camshaft?
The camshaft is one of the main components for the operation of the engine, since it is in charge of controlling the opening and closing of the valves that make the mixture of air and fuel enter the cylinders and also control those that serve to expel gases that are generated during the engine’s combustion process.


How does a camshaft work?
This component is practically a shaft that rotates on itself and has cams embedded throughout. That’s where the name Camshaft comes from.

You could say that the cams are small bumps and when this shaft begins to rotate they push two different sets of valves. intake and exhaust valves.


Parts of a camshaft
This element is made up of several parts and each one does a special job.

Cams: Open and close intake and exhaust valves
Gears: We can find two different pinion gears, one in a distribution system that is coupled together with the crankshaft to synchronize and the other is used for the oil pump.
Stumps: These serve as a support point for the tree.
Camshaft parts

Camshaft systems
Automotive engines use two different systems, either one where only one tree is incorporated or another system where two different ones are used.

SOCH – Single Overhead Camshaft (simple)
These only use a shaft that is responsible for the two sets of valves, the intake and the exhaust

Soch system

Afrank99 [ CC BY-SA 2.5 ], via Wikimedia Commons

DOCH – Double Overhead Camshaft (Double)
This incorporates two trees to make the process of opening and closing the valves. One is used for admission, while the other is used for expulsion.

tree doch

Stahlkocher [ CC BY-SA 3.0 ], via Wikimedia Commons

Types of camshafts
We can find two different types according to their construction.

This type is characterized by its stumps going from largest to smallest diameter. These mechanisms are not rectifiable because all the diameters are different.

Unlike the telescopic type, the dies are all of the same diameter and thanks to this they can be rectified, except when they are twisted and the cams have excessive wear.

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