Transfer of the method for aurally correct design to ground bevel gears extended by the embossing of a targeted microgeometry scattering

 

Starting Situation

Lapped bevel gears are perceived more pleasantly acoustically. The cause is considered to be the microgeometry scatter and pitch deviation due to the not completely compensated hardness distortions of the heat treatment in the lapping process. Ground bevel gears, on the other hand, show a high reproducibility of the geometry and small pitch deviations. The high geometry quality can lead to a tonal excitation in the noise spectrum at high modification amounts. In the basic projects WE 550/162-1+2 / BR 2905/32-1+2, methods for dynamic simulation of the tooth mesh and psychoacoustic evaluation of the gear noise were determined which show the potential for noise-compliant design in practice.

Research Objective

The aim of the research project is to transfer the method for aurally correct design to a bevel gear set from an automotive application. The method from BR 2905/32-1+2 and WE 550/162-1+2 is to be transferred in such a way that the hearing-related design is extended to the consideration of a rollover in order to specifically design signal-noise effects from microgeometry scattering over the circumference of a gear. Microgeometry scattering is to be used to reduce the tonality of the gear noise spectrum.