Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Study on the Fluid Film Thickness and Pressure of Elliptical Elastohydrodynamic Lubrication with Spin Effect for the Power Transmitting Contact in the Continuously Variable Transmission

무단 변속기의 동력전달 접촉에서 회전운동을 고려한 타원형상의 점접촉 탄성유체윤활연구

  • Jang, Si-Youl (School of Mechanical and Automotive Engineering, Kookmin University)
  • 장시열 (국민대학교 기계자동차공학부)
  • Published : 2005.12.01
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Abstract

Continuously variable transmission (CVT) of toroidal type has a elliptical shape of contact zone under the elastohydrodynamic lubrication (EHL) condition, where the power is transmitted only by shearing the lubricant. Due to the small contact area of elliptical shape, the traction of the shear behaviors of lubricant over the contact zone is under extremely high contact pressure over 1.0GPa. During the power transmission by shearing the fluid, many kinds of mechanical movements occur such as squeezing, sliding, rolling and spin. Among the movements, the spin effect that is the most undesirable contact behavior in transmitting the power frequently makes significant abnormal wear damage. In this work, the analysis of elliptical contact of EHL with spin effect is performed, which will give very useful information to understand the traction behaviors in toroidal type of CVT system.

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References

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