Investigation of Macro- Geometric and Micro- Geometric Modification on the Static Transmission Error and Load Sharing Factor of Helical Gears

The aim of this study is an investigate the effect of design parameters and profile modification on static transmission error and load sharing factor of helical gears using analytical method with Matlab software. In the first step, we define the concept of transmission error that is the source of noise in the gear pair. Then load sharing factor and static transmission error are calculated using the gear mesh stiffness. In this paper the total stiffness of helical gear’s and the load sharing factor is determined using an accumulated integral potential energy method. In the next, results are verified and the effect of design parameters on avarege and pick to pick of the helical gears transmission error and load sharing factor is investigated. This parameter is called macro-geometric parameters of gear pairs. At the end, we write a Matlab code to modify the tip relif of tooth to optimize the load sharing factor and static transmission error. The results of this study show that the simultaneous correction of macro-geometric modifications and profile modification (micro-geometric modifications) cause a more uniform load distribution and significantly reduce the transmission error of the helical gear and consequently reduce the noise and vibration of the gearboxes.