Design Method of Optimum Number of Teeth for Vehicle Transmission Considering Human Aural Characteristics

摘要

The gear noise has been reduced by reducing the meshing transmission error to improve the gear noise up to now. However, it seems that there is no research that considers even human aural characteristic yet in this field. Therefore, we propose a new design method of the low noise gear, which according to human aural characteristic. The proposed technique is a gear design to control the frequency of the gear noise by changing number of tooth. First of all, human aural characteristic was researched in a special acoustic environment in the vehicle. Secondly, the characteristic of vehicle interior sound was investigated. Thirdly, the relationship between the number of teeth and the sound level of the gear noise was investigated. Finally, it was demonstrated that a proposed method was effective to design an advantageous number of gear teeth according to human aural characteristic. It was found that the proposed method of varying the number of teeth was effective for designing gears with optimal human aural characteristics.