The camshaft and the gas change principle. Designed by M. Turat

The combustion engine works by the gas change principle. Fresh charge flows through an opened inlet valve into the cylinder, gets compressed, burnt, expanded and flows through the opened outlet valve into the exhaust system. The opening and closing of the valves of a four-stroke engine is done by cams. The main task of the camshaft is to open and close the valves at predetermined times for the change of charge. The conventional valve control opens its valves with a force of the cams over an actuating part. The valve opens itself against the valve spring force. The outlet valve closes with the preloaded valve spring.
The camshaft of a four-stroke engine, which is driven by the crankshaft, turns with half of the crankshaft speed.
The provision of the opening and closing time of the valves happens with the geometry of the cams. The valve timing affects torque, performance and fuel consumption.
The main part of the camshaft is its cylindrical shaft. It can be either hollow or made of full material. The individual cams for the valve timing are arranged on the shaft. The actuating forces of the cams are absorbed by the camshaft bearings. The camshaft is connected to a drive wheel, which itself is either driven by a timing belt or chain.

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Well done!!!! Thanks!