Development of a New Light-Weight Suspension Coil Spring

Paper #:
  • 930263

Published:
  • 1993-03-01
Citation:
Sakakibara, T., Kusakari, W., Nakano, O., Yasuda, S. et al., "Development of a New Light-Weight Suspension Coil Spring," SAE Technical Paper 930263, 1993, https://doi.org/10.4271/930263.
Pages:
12
Abstract:
This newly developed helical spring can be used at a stress level up to 1300 MPa. The material is composed of Fe-C-Si-Mn-Ni-Cr-Mo-V alloy. Its strength-toughness balance was greatly superior to that of other spring steels.To improve the fatigue strength at a higher stress level, decarburization at the surface upon austenitizing was severely controlled, applying induction heating. Then, a special shot peening process, introduced for the first time, was applied to obtain a surface residual stress at the surface of over 1000 MPa. The spring was first applied to a 1992 TOYOTA model car. Plans are to increase the use since the spring material achieves a weight reduction of at least 30 % and, possibly, 35 to 40 %.
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