Intake, induction or suction: The intake valves are open as a result of the cam lobe pressing down on the valve stem.The piston moves downward increasing the volume of the combustion chamber and allowing air to enter in the case of a CI engine or an air fuel mix in the case of SI engines that do not use direct injection.
The air or air-fuel mixture is called the charge in any case. Compression: In this stroke, both valves are closed and the piston moves upward reducing the combustion chamber volume which reaches its minimum when the piston is at TDC.The piston performs work on the charge as it is being compressed; as a result its pressure, temperature and density increase; an approximation to this behavior is provided by the ideal gas law.
In the case of a CI engine the fuel injector quickly injects fuel into the combustion chamber as a spray; the fuel ignites due to the high temperature. Power or working stroke: The pressure of the combustion gases pushes the piston downward, generating more work than it required to compress the charge.
Lubrication Diagram of an engine using pressurized lubrication Wikimedia Commons has media related to Internal combustion piston engine lubrication systems. Surfaces in contact and relative motion to other surfaces require lubrication to reduce wear, noise and increase efficiency by reducing the power wasting in overcoming friction, or to make the mechanism work at all.
Toothed belts do not require lubrication. Źródło: https://en.wikipedia.org/wiki/Internal_combustion_engine
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