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A Study of the Effects of Ceramic Valve Train Parts on Reduction of Engine Friction
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English
Abstract
We developed a quantitative evaluation method based on observation of torque wave due to valve train friction. We evaluated the reduction of energy consumed in one cam drive cycle. The result of torque wave analysis shows the Si3N4 adjusting shim with a mirror-finished surface reduces valve train friction by 25%-30% in some limited range of engine speed. We discussed that by what means the reduction in valve train friction was being achieved and that the oil film parameter Λ, according to the EHL(Elasto-Hydrodynamic Lubrication) theory.
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Izumida, H., Nishioka, T., Yamakawa, A., and Yamagiwa, M., "A Study of the Effects of Ceramic Valve Train Parts on Reduction of Engine Friction," SAE Technical Paper 970003, 1997, https://doi.org/10.4271/970003.Also In
References
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- Tashiro K. et al. “Ceramics Rocker Arm” Journal of The Society of Automotive Engineers of Japan 39 10 1179 1985
- Nishioka T. et al. “High Strength Si 3 N 4 Ceramics and It's Application for Automotive Parts” Journal of The Japan Society for Precision Engineering 60 9 1994
- (4) Nishioka T. et al. “Development of High Strength Si3N4 Sintered Body for the Valve Systems of Automotive Engines” SAE TECHNICAL PAPER SERIES No. 920384
- (5) Kato A. et al. “An Analysis of Friction Reduction Techniques for Direct-acting Valve Train Systems” 1992 JSAE Autumn Convention Proceedings 924 85 1992