Numerical modelling of spiroid gears with localized tooth contact

A novel approach to obtaining localised bearing contact of spiroid gear drives has been developed. The localized contact is achieved by modifying the pinion tooth surface. With this approach, only the pinion cutter's geometrical angles and mounting position need to be adjusted, and, hence, it is simpler and more economical than other methods. In this paper the following are presented: overview of the approach, equations for modified spiroid gear tooth geometry, and computer simulation results. The results confirm that the proposed modification of the tooth geometry permits a localized bearing contact.