Gear standards for reliable measurement of noise-causing tooth flank ripples: Quick verification of the measurement precision

Abstract

In modern drives, the requirements regarding low noise, transmittable torque and low weight are constantly increasing. As soon as a noise excitation occurs in the transmission, tooth flank ripples at the gears are frequently responsible. These ripples usually have an amplitude between 0.10 and 1.00 µm. Fine structures like these can only be reliably detected with high-precision gear measuring machines. However, there are no validation and traceability options for the calculated ripple characteristics. In this paper, a ripple standard with a 69th ghost order is presented, allowing to check the accuracy of ripple measurement on gear measuring machines. The standard is tested regarding its practicality in comparative measurements, to be able to evaluate and improve the accuracy of the ripple measurement used today. The investigation of a large number of gear measuring machines indicates that they achieve a very low variance. Finally, the influence of the selected filter on the measurement result of high-frequency ripples is shown. The filter can be adjusted to control an amplitude absorption.