Computerized Design and Generation of Low-Noise Gears With Localized Bearing Contact.

SUMMARY The results of research projects directed at the reduction of noise cause by misalignment of the following gear drives: double-circular arc helical gears, modified involute helical gears, face-milled spiral bevel gears and face-milled formate cut hypoid gears are presented. Misalignment in these type of gear drives causes periodic, almost linear discontinuous functions of transmission errors. The period of such functions is the cycle of meshing when one pair of teeth is changed for the next. Due to the discontinuity of such functions of transmission errors high vibration and noise are inevitable. A predesigned parabolic function of transmission errors that is able to absorb linear discontinuous functions of transmission errors, and change the resulting function of transmission errors into a continuous one is proposed. The proposed idea was successfully tested using spiral bevel gears and the noise was reduced a substantial amount in comparison with the existing design. gears. The effectiveness of the proposed approach has been investigated by developed TCA (Tooth Contact Analy- sis) programs. The bearing contact for the mentioned above gears is localized. Conditions that avoid edge contact for the gear drives have been determined. Manufacturing of helical gears with new topology by hobs and grinding worms has been investigated. The idea of a predesigned parabolic function is applied for the reduction of noise of helical and hypoid 1. INTRODUCTION Vibration and noise of gears