This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of Hydrogen-Free Diamond-Like Carbon Coating for Piston Rings
Technical Paper
2012-01-1327
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The first-ever application of a hydrogen-free diamond-like carbon (H free DLC) coating to a mass-production gasoline engine reduces friction between the cylinder bore and piston by 18%. It is explained the reducing friction effect of H free DLC by oil film thickness of piston ring. When H-free DLC is applied to top ring, friction is over 10% reduced. Because low friction coating is effective in a thin oil film at a large area near top dead center (TDC). It is also found that the friction reduction effect is enhanced when low viscosity engine oil is used. DLC as a low friction coating is more effective in a thinner oil film. In this study, the adhesion strength of H-free DLC coating on piston rings is improved because of providing a smooth substrate, the new washing process and the optimized coating characteristics. Adhesion strength is verified by test results using actual parts considered to contribute to piston ring load. Piston rings with low friction and high reliability are developed.
Recommended Content
Authors
Citation
Higuchi, T., Mabuchi, Y., Ichihara, H., Murata, T. et al., "Development of Hydrogen-Free Diamond-Like Carbon Coating for Piston Rings," SAE Technical Paper 2012-01-1327, 2012, https://doi.org/10.4271/2012-01-1327.Also In
References
- Mabuchi, Y. Hamada, T. Yasuda, Y. Kano, M. Ariga, K. Diamond-like carbon for reducing valve-train friction FISITA 2004 F388
- Okuda, S. Sagawa, T. Kubo, T. Nanao, H. Minami, I. Mori, S. Investigation of tribo-chemistry using stable isotopic tracers: Mechanism of low friction of DLC lubricated by friction modifiers ASIATRIB, Proceeding 2006 11
- Tung, Simon C. Gao, Hong Tribological characteristics and surface interaction between piston ring coatings and a blend of energy-conserving oils and ethanol fuels WEAR 255 2003 1276 1285
- Shin, K. Tateishi, Y. Furuhama, S. “Measurement of Oil-Film-Thickness Between Piston Ring and Cylinder,” SAE Technical Paper 830068 1983 10.4271/830068
- Takiguchi, Masaaki Ando, Hajime Takimoto, Takahiro Uratsuka, Akiyoshi Characteristics of friction and lubrication of two-ring pistons JSAE Review 17 1 January 1996 11 16
- Dowson, D. Proc. Elastohydrodynamics., Inst. Mech. Eng. 182 1968 151