Development of High Fatigue Strength Spring - Application on Clutch Disc Torsional Damper 950903
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.
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. Download Citation