Development of a new-type suspension spring for rally cars

The functions of the suspension springs for an automobile are to keep the control stability good and to improve riding comfort. Keeping control stability is important, especially for motor sports such as rallying. A new type rectangular wire helical spring is contrived by the authors, which joins the first coil part and the second coil part with a twisting part. If this spring is used as suspension springs for rally cars, the control stability can be kept good while absorbing impact from the road. It was clarified in this study that the spring characteristic is non-linear. Although the stress was checked by FEM analysis and theory on the twisting part, stress concentration was not detected. Furthermore manufacturing equipment for this spring was proposed by the authors.