Study On Tooth Profile Modification Of Involute Gear Pair With A Small Number Of Teeth

Alignment error, machining error and deformation because of transmitting load change the meshing condition of gear pair. Tooth profile modification can improve its meshing performance. Researches on tooth profile modification of involute gear pair with a small number of teeth have been carried out. Involute gear pair with a small number of teeth refers to gear pair of which the pinion has less than 6 teeth. The following work has been done:Firstly, the effect that alignment error and machining error have on meshing performance of gear pair is analyzed from end-face and longitudinal angle respectively. Taking contact line deviation as influence evaluation index of alignment error on evenness of longitudinal contact, analysis of alignment error is conducted. Secondly, end-face meshing and whole meshing of gear pair, deformation of gear body and tooth and its effect on meshing condition are analyzed. Thirdly, longitudinal tooth profile modification of involute gear pair with a small number of teeth is designed aiming at error and deformation. Aiming at tooth comprehensive elastic deformation, diagonal modification is designed, which means to eliminate engaging-in and engaging-out impact and keep static transmission error constant. At last, deformation values as resources of tooth profile modification parameters are achieved with finite element software, and an example of tooth profile modification has been given.The analysis on effect of error and deformation on meshing performance, and the design of tooth profile modification have certain reference value on improving the performance of involute gear pair with a small number of teeth in really circumstance.