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 SoyamaEmail author
  • Masanori Shimizu
  • Yuji Hattori
  • Yuji Nagasawa

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...


Residual Stress Cavitation Fatigue Strength Fatigue Test Compressive Residual Stress 


  1. 1.
    Soyama H, Park JD, Saka M (2000) Trans ASME J Manuf Sci Eng 122:83. doi: CrossRefGoogle Scholar
  2. 2.
    Soyama H, Kusaka T, Saka M (2001) J Mater Sci Lett 20:1263. doi: CrossRefGoogle Scholar
  3. 3.
    Soyama H, Saito K, Saka M (2002) Trans ASME J Eng Mater Technol 124:135. doi: CrossRefGoogle Scholar
  4. 4.
    Odhiambo D, Soyama H (2003) Inter J Fatigue 25:1217. doi: CrossRefGoogle Scholar
  5. 5.
    Soyama H, Sasaki K, Odhiambo D, Saka M (2003) JSME Int J 46A:398. doi: CrossRefGoogle Scholar
  6. 6.
    Soyama H, Macodiyo DO, Mall S (2004) Tribol Lett 17:501. doi: CrossRefGoogle Scholar
  7. 7.
    Soyama H (2004) Trans ASME J Eng Mater Technol 126:123. doi: CrossRefGoogle Scholar
  8. 8.
    Soyama H, Macodiyo DO (2005) Tribol Lett 18:181. doi: CrossRefGoogle Scholar
  9. 9.
    Soyama H (2007) J Mater Sci 42:6638. doi: CrossRefGoogle Scholar
  10. 10.
    He BB (2003) Powder Diffr 18:71. doi: CrossRefGoogle Scholar
  11. 11.
    Little RE (1972) ASTM STP 511:29Google Scholar

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

Personalised recommendations