Harmonic Drive
Universal Testing Machine Torsion Axis
Precision output bearing
In many industrial sectors the testing of materials and piece parts is an indispensable part of product development and quality assurance. Universal testing machines are used to test specimens in tension, compression, bending and hysteresis under conditions of continuous, dead and swelling strain. The material's behaviour is measured and documented at every stage of the straining process. This design example shows how a HFUC component set has been applied in the torsion axis of a universal testing machine.
This axis is used to measure the torsional stiffness of material specimens. In this application particular importance is attached to high stiffness, high reduction ratio and above all, zero backlash. The latter feature is essential to ensure that the measured data is completely reliable. The high reduction ratio and excellent angular transmission characteristics of the Harmonic Drive gear ensure a slow and even rotation of the specimen, even under heavy torque loads.
The component set is mounted in a housing and is driven by an AC servomotor. The output shaft is mounted in stiff pre-loaded taper roller bearings.
