Spiral springs for overhead contact line systems are designed for high torques of up to 1,000 Nm. They fall into the category of “heavy spiral springs”.
Tensioning systems with spiral springs reliably compensate for temperature-related changes in the length of the overhead contact lines whatever the season.
51CrV4
Spiral springs for carbon brush systems have a typical S-shaped outer hook in order to achieve the flattest possible force curve.
Carbon brush springs create the required contact pressure and can therefore maintain the electrical contact over the required service life.
Stainless spring steel strip SUPERFLEX
These spiral springs work like bimetal springs. However, they do not react to heat, but rather to moisture.
The activator, a kind of paper, is connected to the passivator, a steel strip. When the humidity rises, the paper becomes longer as the fibers swell and acts on the steel strip, which retains its length. The resulting curvature causes the pointer to deflect.
Hygroband
