Ventilstillingsfjær

Ventilstillingsfjær, often translated as valve spring, is a crucial component in many internal combustion engines. Its primary function is to ensure the valve returns to its closed position after being opened by the camshaft. This rapid and reliable closure is essential for maintaining proper compression within the cylinder, preventing leakage of exhaust gases, and controlling the timing of the intake and exhaust events.

The design of a ventilstillingsfjær can vary, but it typically consists of a coiled spring made of high-strength steel. The spring is compressed when the valve is pushed open, and its stored energy is released to snap the valve shut. The stiffness and length of the spring are carefully engineered to match the engine's speed and operating characteristics. Factors such as engine RPM, valve lift, and valve weight influence the required spring force to achieve optimal performance.

Failure of a ventilstillingsfjær can lead to significant engine damage. If a spring breaks or loses its tension, the valve may not close properly, leading to a loss of compression, misfires, and potential piston-to-valve collision. Regular inspection and replacement of valve springs, especially in high-performance or heavily used engines, are part of routine engine maintenance. The material composition and heat treatment of the spring are critical for its durability and resistance to fatigue.