Mechanical elements manufacturer Miki Pulley has announced its Step-Flex™ Couplings, designed to improve ball screw performance while solving resonance and vibration problems.
The Step-Flex coupling, which has a two-part elastomer element combination, is designed to dampen vibration caused by the actuator carrier when struggling to find its home position by making small adjustments in rapid sequence.
With this design, the hard (black) element is separated from the aluminum alloy hubs by a softer (green) elastomer disc. According to the company, this combination maintains adequate torsional stiffness for precise positional accuracy while still allowing for minimal angular and parallel misalignment, and absorbing vibration. The power-transmitting element, consisting of different hardness layers, also achieves a reduction in counter force generated by misalignment, thus reducing the load on the bearing and resulting in reduced heat load.
Another key feature is the electric and temperature isolation provided by the coupling’s elastomer element. This mitigates conductive heat transfer from motor to output shaft, important in rotary motion applications. Applications include automation of all types where ball screws are used including packaging systems, semi-conductor assembly systems, laboratory automation and medical equipment.
Image courtesy of Miki Pulley.