Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Research on Friction Characteristics of Constant Velocity Joint Grease

등속조인트용 그리스 마찰특성 연구

  • Lee, Sung Uk (Materials Technology & Analysis Team, Hyundai Motor Company) ;
  • Bae, Dae Yoon (Materials Technology & Analysis Team, Hyundai Motor Company)
  • 이승욱 (현대자동차 재료분석팀) ;
  • 배대윤 (현대자동차 재료분석팀)
  • Received : 2013.04.30
  • Accepted : 2013.06.03
  • Published : 2013.08.30
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Abstract

A GAF (generated axial force) is produced at a plunging-type CVJ (constant velocity joint). A high GAF can cause vibrations in a vehicle. Grease is used to reduce friction between the roller and the track of the outer case of a CVJ. The grease performance depends on the surface conditions and operating temperature. The surface of the outer case is extremely rough and hard. In recent times, the maximum operating temperature of CVJs has crossed $140^{\circ}C$, because the exhaust line is now located close to the CVJ. In this study, we examined the friction characteristics of friction additives at $25-150^{\circ}C$ and determined an optimal formulation with a low friction coefficient. This formulation can be used to develop low-friction grease that can reduce the GAF produced at a CVJ by approximately 7-26%.

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References

  1. J. Park, "A Study on Axial Force of Tripod Constant Velocity Joint," KSAE Fall Conference Proceedings, pp.1008-1013, 2007.
  2. S. T. Oh, "Vehicle Shudder Associated with Axial Thrust Force of C.V.Joint for Automobile," Transactions of KSAE, Vol.4, No.2, pp.198-208, 1996.
  3. S. T. Oh, "A Study on the Vehicle Shudder Associated with Axial Force of Tripod Joint for Automobile," Transactions of KSAE, Vol.5, No.6, pp.53-63, 1997.
  4. Gareth Fisf and James Cole, "Tribology and Lubrication Requirement of Constant Velocity Joint," SAE 980835, 1998.
  5. Chul-Hee Lee, Jae-Young Choi, In-Sik Jeon, Won- Ho Cho, and Hyuk-Chae Yun, "Grease Degradation in Constant Velocity (CV) Joints," STLE, Tribology Transaction, Vol. 54, 825-831, 2011. https://doi.org/10.1080/10402004.2011.606958
  6. Masayoshi Muraki, "Synergistic Effect on Frictional Characteristics Under Rolling-sliding Conditions due to a Combination of Molybdenum Dialkyldithiocarbamate and Zincdialkyldithiophosphate," Tribology international, Vol. 30, No.1 pp. 69-75, 1997. https://doi.org/10.1016/0301-679X(96)00025-4
  7. R. Unnikrishnan, "Additive-additive interact ion : an XPS study of ZDDP on AW/EP characteristics of molybdenum based additives," Wear, Vol. 252 pp. 240-249, 2002. https://doi.org/10.1016/S0043-1648(01)00865-1
  8. Young Whan Kim, "Friction Reduction with oilsoluble Molybdenum Dialkyle Dithio Carbamate and Environmental Effect," KSTLE, Vol. 6, No. 1, pp. 68-73, 1990.
  9. J Crawford, A Psaila, In RM Mortier and ST Orszulik, eds. "Chemisty and Technology of Lubricants," Miscellaneous Additives. London, pp. 160-165, 1992.
  10. Jian-Huei Choo, "Influence of Organic Friction Modifier on Liquid Slip : A New Mechanism of Organic Friction Modifier Action," Tribo lett., Vol. 27, pp. 239-244, 2007. https://doi.org/10.1007/s11249-007-9231-z