AGMA 19FTM09 PDF

The noise behavior of transmission is mainly caused by the excitation in the gear mesh. The standardized design and calculation methods for gears concentrate on the reduction of the excitation level. However, often the physical noise characteristics do not conform with the human noise perception. Thus, gear design rules and guidelines are required that are able to rate the excitation according to the perception. The effect of the targeted topography scatter generally described is the reduction of the gear mesh amplitudes with an increase of the background noise. In this report, the noise behavior of bevel gears is investigated with a targeted topography scattering. The excitation and noise behavior is analyzed from the excitation in tooth contact by transmission error measurements up to noise emission in the form of airborne noise. Finally, it is the objective to evaluate the impact of individual topography scattering on the dynamic noise behavior. The analysis of the noise behavior of two variants are compared regarding the difference in psychoacoustic parameters such as loudness and tonality. The potentials of the topography deviation for the optimization of ground bevel gears in terms of tonality reduction will be shown by test results. A test fixture for the evaluation of the operational behavior under loaded and dynamic conditions will be used. Finally, the method is applied to a vehicle transmission and the noise behavior on the test bench and inside of the vehicle is investigated and evaluated.