This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Multi-Variable Experimental Study of Diesel Geartrain Rattle
Technical Paper
2011-01-1561
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Geartrain noise can be a significant contribution to the overall sound level of diesel engines. Some engine manufacturers employ isolation solutions such as sound deadening covers and foam panels to combat the problem, but these add cost. Little has been published on geartrain noise reduction, and public standards for diesel geartrain design and development are not available. This paper describes an experimental study of the relative influence of gear design parameters on the rattle noise of a diesel engine timing geartrain. The geartrains of several diesel engines were benchmarked to determine the noise reduction strategies employed. A total of three gear sets were designed and tested in a 3.3L four cylinder normally aspirated diesel engine. The experimentation quantified the influence of an anti backlash idler gear in reducing gear rattle noise, and revealed that a key path for gear rattle noise transmission is through an idler gear journal bearing shaft. A backlash investigation showed that increasing backlash increases rattle, with a greater penalty at lower speed. While definite conclusions could not be made, there was evidence that changing to a different idler gear material with increased internal damping properties had an effect in reducing gear rattle noise. Increasing the contact ratio in a helical gear set and increasing the idler gear journal bearing clearance allowed the anti-backlash gear to be eliminated while maintaining the same overall noise level. The gear rattle sound became audible, however.
Recommended Content
Citation
Bailey, G. and Fussner, D., "A Multi-Variable Experimental Study of Diesel Geartrain Rattle," SAE Technical Paper 2011-01-1561, 2011, https://doi.org/10.4271/2011-01-1561.Also In
References
- Özgüven Houser “Mathematical Models Used in Gear Dynamics - A Review” Journal of Sound and Vibration 121 3 1988 383 411
- Padmanabhan, C. Rook, T. Singh, R. “Modeling of Automotive Gear Rattle Phenomenon: State of the Art,” SAE Technical Paper 951316 1995 10.4271/951316
- Houser “Gear Noise Sources and Their Prediciton Using Mathematical Models” Proceedings OEM Conference 213 222 September 11 1985 Philadelphia, Pennsylvania
- Spessert, B. Ponsa, R. “Investigation in the Noise from Main Running Gear, Timing Gears and Injection Pump of DI Diesel Engines,” SAE Technical Paper 900012 1990 10.4271/900012
- Houser Harianto Talbot “Gear Mesh Misalignment: Defined, Corrected and Analyzed for Stresses and Noise” Gear Solutions June 2006 34 43
- Cai “Simulation on the rotational vibration of helical gears in consideration of the tooth separation phenomenon (a new stiffness function of helical involute tooth pair)” ASME Journal of Mechanical Design September 1995 117 460 469