Inefficiency predictions in a hypoid gear pair through tribodynamics analysis
journal contributionposted on 24.11.2017, 10:38 authored by Leonidas I. Paouris, Ramin RahmaniRamin Rahmani, Stephanos TheodossiadesStephanos Theodossiades, Homer Rahnejat, Gregory Hunt, William Barton
A tribo-dynamics model, predicting the conjunctional inefficiency and dynamic response of automotive hypoid gear pairs is presented. A dynamics model is coupled with an analytical friction model (viscous and boundary). The temperature rise at the centre of the conjunction is accounted for through use of thermal network model and Time Temperature Superposition (TTS) method, as well as the time varying geometry of the meshing gear teeth. Newtonian and non-Newtonian lubricant shear behaviour are both considered Surface topography measurements of a run-in pinions are obtained. Inefficiency calculations are performed for typical automotive drive cycle snapshots. Precisely measured lubricant shear characterstics for lubricants different blended viscosity modifiers and evolving surface topography are used in the study of transmission inefficiency. The integrated thermal-tribodynamic analysis is shown to distinguish between different viscosity modifier types, an approach not hitherto reported in literature.
The authors would like to express their gratitude to Lubrizol Ltd. for sponsorhip of this research.
- Mechanical, Electrical and Manufacturing Engineering