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Reliable Clutches for High-Speed Applications

Drive axes in the high-speed range require reliable couplings - both for overload protection and to compensate for shaft misalignment. At Automatica, Mayr Antriebstechnik will be presenting its new developments for test bench technology on Stand 317 in Hall B6.

Based on the Roba DS steel disc clutch, Mayr Antriebstechnik has developed a weight-optimized version made of aluminium. Compared to the steel version, the outer diameter of this new clutch has been reduced by up to 10 millimetres, while the mass and inertia—depending on the design and size—are 40 to 60 percent of the steel version. The power density, on the other hand, remains unchanged.

This is tailored for high-speed applications, for example in the field of test bench technology. Shaft compensation couplings are a crucial accessory in this area, as they minimize the disturbance variables acting on the measuring flange. These disturbance variables or so-called parasitic forces are often caused by misalignment in the drive train. Offsets between the input and output sides occur in almost all applications. Shaft compensation couplings are therefore used together with the measuring flange. Here it is important that the geometric basis is correct and that the couplings are already designed for measuring flanges and high speed in their standard version. It is important to find the balance between rigidity and elasticity in order to avoid restoring forces on the system.

If the torque in a test bench exceeds the limit value set on the safety clutch, the clutch disengages and separates the input and output within fractions of a second. In the worst case scenario, the measuring shaft has to be recalibrated after an overload, but the safety clutch reliably prevents expensive damage to the drivetrain or test specimen. The EAS HSE safety clutches transmit torques backlash-free and with high torsional rigidity. They are also compact and have a low mass moment of inertia with a high power density.

The compact, power-dense design of the couplings is achieved through a small outer diameter with a relatively large bore diameter. Ultimately, the following applies to the design: Bore diameter, outer diameter and element size must harmonize in order to achieve a low-vibration system that functions precisely when triggered.