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Perfect Protection for Servo Axes: Page 2
Mechanical torque limiting clutches from mayr power transmission have always been used in the servo drives of machine tools, and have proven their worth thousands of times. Nevertheless, machine manufacturers still renounce such protective devices in many servo axes. In most cases, they are still concerned about the additional mass moments of inertia, the loss of torsional rigidity and last but not least about the higher costs. The latest generation of mayr-torque limiting clutches with the brand name EAS-smartic has confronted these concerns. They have been specially adapted to the requirements of machine tool axes.
Over 20 years of experience in the construction and production of completely backlash-free, positive-locking torque limiting clutches have influenced the development of the extremely compact and high performance density EAS-smartic. The outer diameter equals that of a standard shaft coupling, and it is only c. 10 to 15 mm longer in total length. This results in a very low mass moment of inertia which is lower than for example on a steel servo coupling. Hardened components with the tried and tested ball-detent principle and special cup springs provide extremely high torsional rigidity. All components have been dimensioned so that reliability and lifetime do not have to be compromised despite the high performance density.
- EAS-smartic-torsionally rigid between a servo motor and a spindle. The torque limiting clutch limits the torque to the set value, the mounted flexible,
Another new feature is the comfortable torque adjustment. If no specific value is required, the clutch is pre-set manufacturer-side to approximately 75 per cent of the maximum torque and delivered. A reference marking and torque indication on the clutch show the set value directly. In only a few simple steps, the torque can be changed to another required value. Comfortable handling and cost-saving were also the centre of interest when the installation mode was chosen. The clutch is mounted onto the shaft by tightening one single screw. The EAS-smartic clamping hub is dimensioned so that it transmits even the maximum torque safely and reliably.
During failure-free operation, the EAS-smartic transmits the torque from the drive shaft onto a drive element (sprocket wheel, toothed belt pulley) or - in combination with an elastic coupling - onto an output shaft. The torque is transmitted backlash-free over the entire clutch service lifetime. If the preset torque is exceeded, the clutch disengages. The torque immediately drops. A mounted limit switch registers the disengagement movement and switches off the drive. After the cause of the malfunction has been removed, the clutch reengages automatically and is ready for operation immediately.