VAROLASTIC® F

The peculiar characteristic of the slightly to moderately progressive torsional stiffness characteristic curve is achieved by special rollers made of synthetic elastomer material precisely guided and loaded between the coupling flanges with increasing load. This is realized by the convex-concave contour guide in the pockets of the coupling flanges.

This contour guide is optimally adjusted based on numerical calculations for each size, the nominal torque range of the coupling can subsequently be utilized for up to 100 %.

With low operating loads (like with idle mode) the torsional stiffness of the coupling is very low, heavily insulating vibration amplitudes on the driving side and thus, for example, preventing noise excitation generated by gearbox splines.

In real-life operation the torsional stiffness permanently changes depending on the base load, amplitude and frequency (as well as the engine excitation systems). This non-linearity does not create any stationary, settling condition in the range of natural frequencies. Finally the coupling stiffness in the overload range increases more strongly so that peak and special loads are effectively damped.