Nukkvõllid

Nukkvõllid, also known as camshafts, are a crucial component in internal combustion engines. Their primary function is to control the opening and closing of the engine's intake and exhaust valves. This precise timing is essential for the efficient flow of the air-fuel mixture into the combustion chamber and the expulsion of exhaust gases.

A nukkvõll is a rotating shaft featuring a series of lobes, or cams. As the nukkvõll rotates, these lobes push on followers, which in turn operate the valve mechanisms. The shape and profile of these lobes determine the duration and lift of the valves, directly influencing the engine's performance characteristics such as power output and fuel efficiency.

Nukkvõllid are typically driven by the engine's crankshaft via a timing belt, timing chain, or gears. This ensures that the nukkvõll rotates at a specific ratio to the crankshaft, usually at half the speed of the crankshaft for a four-stroke engine. The design and material of the nukkvõll are critical for its durability and performance. Common materials include cast iron and hardened steel. Over time, wear on the lobes or bearings can lead to reduced engine performance and increased fuel consumption.