Validation of Noise Reduction Using Low-Tone Gearing on a Push-Rod System

Abstract:

Electric motors with very high speeds are used widely for highly automated and autonomous driving. A low weight design of high-speed electric motors can reduce the demand for environmentally harmful materials. However， due to the regular involute gears， which are usually used with high-speed motors to bring the rotation speed and output torque into target values， a noticeable and extremely annoying tonal noise occurs， which compromises the comfort of passengers significantly. Thus， an innovative low-tone gearing with irregular design of tooth is introduced to reduce the noise of gear transmissions. To obtain a low-tone gearing design for an electric push-rod system， which operates the tailgate of vehicles to either open or close， an optimization is conducted. Then for comparison， the sound pressure of the low-tone gearings and a regular design is measured during the operation of the push-rod system. Finally， the reduction of noise by using the low-tone gearing， especially from the aspect of the tonality， is validated by analyzing the measured data.

Key words:low-tone gearing;noise reduction;tonality