Reduction of Vibroacoustic Characteristics of Generating Bevel and Hypoid Gears

Abstract

AbstractThe article analyzes the cutting and grinding of the teeth of generating bevel and hypoid gears which are made by reproducing the machine gearing of the teeth of an imaginary generating wheel with the teeth of the processed wheel during their reciprocal generating. During generating, a rough structure forms on the teeth surface shaped by flat cuts inclined to the base of the tooth. It has been shown that the cut width has a significant effect on the accuracy of the gearing, the roughness of the side surfaces of the teeth, and the vibroacoustic features of bevel and hypoid gears. It has been established that the vibroacoustic activity of a grinding generating hypoid gear largely depends on the roughness of the teeth surface formed by flat cuts. The authors revealed that the composition of the surface roughness of mating gears’ teeth can be controlled by using micro-pulses along the controlled X-axis of the grinding machine, acting towards the workpiece axis. The introduction of micro-pulses during gear grinding makes it possible to avoid contact with the microroughness peaks of teeth surfaces. The tests conducted have shown that the composition of the surface roughness of mating teeth manufactured with micro-pulses along the X-axis during the teeth grinding helped to reduce the vibration features of the generating hypoid gear at the first three harmonics by 15–20%.KeywordsGenerating methodTooth cuttingTooth grindingSurface structureGear accuracyRoughness of tooth surfaces