Geometric generation method and experimental study of gear pair with point contact pattern

Abstract

The geometric characteristic of tooth surface is the key factor to its performance. In this paper, a geometric generation method of point contact gear pair was proposed. By given a tooth surface, a smooth contact trace was determined according to the transmission demand, and the conjugated contact trace can be obtained. A new tooth surface of mating gear was derived by sweeping along the conjugated contact trace. The calculation of sliding coefficient of this type of gear pair was studied. The internal gear pair was taken as an example by taking involute gear as known gear and gear with quadratic curve profile as the mating gear. The gear pair was manufactured and performance experiment was carried out. The results show that the gear pair maintains point contact during the whole meshing process, and the contact point moves along the contact trace. The variation range of the sliding coefficient mainly depends on the involute parameter values at the meshing-in and meshing-out point. The actual contact trace of gear pair is consistent with the theoretical contact trace, and the efficiency is stable in 97.3% ~ 98.4%.

Keywords

• quadratic curve profile
• point contact
• tooth surface generation
• sliding coefficient
• efficiency experiment