Inequidistant planetary gears - feasibility study for gear noise reduction
* Präsentierender Autor
Zusammenfassung:Inequidistant gears are characterized by uneven tooth thicknesses and uneven tooth positions. They are designed to minimize tonal gear noise by rendering the teeths’ meshing irregular. In recent years, the principle of inequidistant gears, developed at the research group SAM at TU Darmstadt, was successfully applied to spur gears and helical gears (see DAGA 2018 and DAGA 2019, for example). However, in many drive train applications, as those in automotive and robotic industry, planetary gears are used. Therefore, this paper evaluates the noise reduction potential of inequidistant planetary gears. The requirements for the design of inequidistant planetary gears are presented and discussed. An exemplary inequidistant planetary gear set and an equivalent conventional planetary gear set with regular toothing are designed. The excitation forces of both planetary gear sets due to the elastic deformation in the mesh are determined by means of numerical simulations. The radiated airborne noise is estimated by calculating the sound radiation of a simplified housing using the fundamental equation of machine acoustics. The results show that the principle of inequidistant gears is also suitable to reduce the noise of planetary gears. Finally, the chances and risks of inequidistant planetary gears regarding their practical application are discussed.