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Journal of Materials Science

, Volume 43, Issue 14, pp 5028–5030 | Cite as

Improving the fatigue strength of the elements of a steel belt for CVT by cavitation shotless peening

  • Hitoshi Soyama
  • Masanori Shimizu
  • Yuji Hattori
  • Yuji Nagasawa
Letter

The elements of steel belts used for continuously variable transmission (CVT) are subjected to a bending load during operation. The weakest portion of the elements is at the root of the “neck” which works into metallic rings. In order to reduce the stress concentration, the root of the neck is rounded and the shape of element is optimized. Nevertheless, if the fatigue strength of the elements can be improved, the steel belt can be applied to larger engines. Although conventional shot peening is one way of enhancing the fatigue strength, it is very difficult for shot to reach into deep and narrow regions.

Recently, a peening method using the impact produced as cavitation bubbles collapse has been developed [1, 2, 3, 4, 5, 6, 7, 8, 9]. This method is called “cavitation shotless peening (CSP)”, as shot are not required [3, 4, 5, 6, 8]. CSP can peen the surface even through deep narrow cavities, as the bubbles can reach these parts and collapse where peening is required.

In the present...

Keywords

Residual Stress Cavitation Fatigue Strength Fatigue Test Compressive Residual Stress 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Hitoshi Soyama
    • 1
  • Masanori Shimizu
    • 2
  • Yuji Hattori
    • 2
  • Yuji Nagasawa
    • 3
  1. 1.Tohoku UniversitySendaiJapan
  2. 2.Toyota Motor CorporationSusonoJapan
  3. 3.Toyota Central R&D Labs. IncNagakuteJapan

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