This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Effect of Vehicle Cruising Speed on the Dynamics of Automotive Hypoid Gears
Technical Paper
2012-01-1543
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The dynamics of automotive differentials have been studied extensively to improve their efficiency and additionally, in recent years, generated noise and vibration. Various mathematical models have been proposed to describe the contact/impact of gear teeth pairs. However, the influence of vehicular cruising speed on the resisting torque has not been considered in sufficient detail. This can lead to unrealistic predictions with regards to loss of contact of teeth pair, a phenomenon which leads to NVH issues. The current work presents a torsional model of a hypoid gear pair. The resisting torque is a function of the traction force and aerodynamic drag, whilst the vehicle is cruising at nominally constant speed. The pinion input torque is derived through assumed instantaneous equilibrium conditions. In this approach, realistic excitation capturing the vehicle's driving conditions is imposed on the dynamics of the hypoid gear pair. The dependence of the gear pair meshing stiffness on the torque amplitude is also considered using Tooth Contact Analysis (TCA). As a result the natural frequency of the system is subject to condition-based variations. The dynamic response of the system is presented at various cruising speeds. Frequency response spectra are derived to illustrate the limiting speed when gear flank separation occurs. The novelty of this model is related to the accurate prediction of gear teeth impacts, leading to the appearance of the axle whine phenomenon. The validation of the numerical findings with published experimental data is part of the planned future work.
Authors
Topic
Citation
Karagiannis, I., Theodossiades, S., and Rahnejat, H., "The Effect of Vehicle Cruising Speed on the Dynamics of Automotive Hypoid Gears," SAE Technical Paper 2012-01-1543, 2012, https://doi.org/10.4271/2012-01-1543.Also In
References
- Sun, Z. Steyer, G. Meinhardt, G. Ranek, M. “NVH Robustness Design of Axle Systems,” SAE Technical Paper 2003-01-1492 2003 10.4271/2003-01-1492
- Colabawala, M. Sorenson, J. Houser, D. “An Experimental Procedure for Characterization of Gear Whine Noise in a Variety of Vehicle Applications,” SAE Technical Paper 2003-01-1488 2003 10.4271/2003-01-1488
- Donley, M. Lim, T. Steyer, G. “Dynamic Analysis of Automotive Gearing Systems,” SAE Technical Paper 920762 1992 10.4271/920762
- Wang, J. Lim, T.C. Li, M. 2007 Dynamics of a hypoid gear pair considering the effects of time-varying mesh parameters and backlash nonlinearity Journal of Sound and Vibration 229 2 287 310
- Vijayakar, S. 1998 Tooth Contact Analysis Software: CALYX Advanced Numerical Solutions Hilliard, OH
- Robert Bosch Gmbh 2011 Automotive Handbook 8 th
- Koronias, G. Theodossiades, S. Rahnejat, H. Saunders, T. 2011 Axle whine phenomenon in light trucks: a combined numerical and experimental investigation Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 225 7 885 894
- Cheng, Y Lim, T.C. 2003 Dynamics of hypoid gear transmission with non-linear time-varying mesh characteristics Trans. ASME, Journal of Mechanical Design 125 373 382
- Choi, B. Yoon, J. Oh, J. 2011 A study on axle gear whine noise reduction with deflection test Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering