Development of High Fatigue Strength Spring - Application on Clutch Disc Torsional Damper

Paper #:
  • 950903

Published:
  • 1995-02-01
Citation:
Nakano, O., Suzuki, M., Koyasu, Y., Morii, A. et al., "Development of High Fatigue Strength Spring - Application on Clutch Disc Torsional Damper," SAE Technical Paper 950903, 1995, https://doi.org/10.4271/950903.
Pages:
10
Abstract:
We have developed a new torsional damper spring which lowers the torsional rigidity of the clutch disc while retaining its conventional size. The following two items have been adopted in the newly developed spring: 1) A new steel wire which suppresses any core-softening of the element wire through nitriding. 2) A dual-stage shot peening method which uses harder steel shots (rather than conventional shots) in order to obtain an optimal residual stress profile.As a result of evaluating the fatigue characteristics of this spring, it was discovered that its fatigue strength is approximately 35% higher than that of the conventional spring. A clutch disc using this spring was able to absorb rattling noises which conventional clutch discs could not.
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