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Industrials vehicules and passengers car have to reduce their tare weight, and to improve safety as well as life expectancy of their components… Composit compression spring is the solution in order to do successfully the job! We will star our statement with a presentation of our study on composit torsion springs and will go on describing SARDOU SA installations devoted to composit. Then, we will introduce compression spring concept, and will explain why they are so good, compared to composit leaf springs and hairpins. We will then show some experimental results and some potential applications.

This paper presents information on new technology which has made the Composite Coil Spring a practical Reality. The light weight and low cost nature of this novel component presents very interesting possibilities for reducing the weight of automotive models. The experimentation with composite materials which was focused on developing practical components with viable manufacturing methods began in our company 1983. The first episode was with very strong torsion members for truck applications. This was followed by development of a unique “C” spring design in 1993 (reported in SAE paper 2000-01-0100). This paper deals with the new successor to these earlier designs, the “Composite Coil Spring”. This paper identifies the manufacturing process that has been developed and patented to provide composite Coil springs cost effectively. The paper also presents the physical properties of the springs which are made from thermoset Epoxy, and E type glass fibers.

Composite C Springs for suspension have been developed by our company since 1993. This paper show some examples of our C springs manufacturing, realization, testing and optimization features. We will start our presentation by an analysis of reasons why Composite Compression Springs (patented) perform well compared to leaf springs. Then we will give examples of some development programs we have successfully carried out from study up to vehicle road testing. The C Springs have been tested in static measuring bench, in fatigue and in relaxation machine. C Springs have been (and are), also road tested. More than hundreds of thousand of kilometers have been achieved with success (near exhaust pipes). We will present examples of spring integration giving a dramatic weight reduction, as well as ride and handling improvement. We will also introduce cost evaluations showing that Composite Compression Springs save money as well as weight on a vehicle.

This paper show some examples of our C springs manufacturing, realization, testing and optimization features. Composite C Springs have been developed by our company Since 1993. We will start our presentation by an analysis of reasons why Composite Compression Springs (patented) perform well compared to leaf springs. Then we will give examples of some development programs we have successfully carried out from study up to vehicle road testing. The C Springs have been tested in static measuring bench, in fatigue and in relaxation machine. C Springs have (and are), also road tested. More than hundred of thousand kilometers have been achieved with success (near exhaust pipe). We will present examples of spring integration giving a dramatic weigh reduction, as well than ride handing improvement. We will also introduce cost notions showings that Composite Compression Springs save money as well as weight on a vehicle.