nokkaakselista

Nokkaakseli, often translated as camshaft, is a vital component in internal combustion engines. Its primary function is to control the opening and closing of the engine's intake and exhaust valves. The camshaft is a rotating shaft that features a series of lobes, or cams, which are shaped to press on tappets or rocker arms. As the camshaft rotates, these lobes push on the valve train components, causing the valves to open at precisely timed intervals during the engine cycle. The shape and timing of these lobes are critical for the engine's performance, efficiency, and emissions.

The camshaft is typically driven by the engine's crankshaft, usually through a timing belt, timing chain, or gears, ensuring synchronization with the piston movement. This precise timing is essential for the proper intake of the air-fuel mixture and the expulsion of exhaust gases. Camshafts can be located either in the engine block (Overhead Valve or OHV design) or in the cylinder head (Overhead Camshaft or OHC design, including Single Overhead Camshaft or SOHC and Double Overhead Camshaft or DOHC). OHC designs generally allow for more precise valve control and higher engine speeds. The material used for camshafts is typically cast iron or steel, chosen for its durability and resistance to wear.