Abstract
The leaf spring is one of the important constituents of automobiles. So its improved quality and durability will be vital factors for increasing car working efficiency and reducing maintenance cost.In order to be used for long time in good condition the leaf spring is not only required to be designed suitably but also attention should be paid to the quality of material and processing.Of course, the leaf spring is apt to snap earlier than usual when the working conditions on road, speed and load etc. are not suitable. We suppose, however, that it is apt to snap earlier owing to the various defects on the quality of materials used. Accordingly, we wanted to investigate what defect will force the leaf spring to snap earlier. And so we picked out about 170 leaves snaped within their guarantee period, and we investigated each their snapped position, surface aspect, fracture, hardness, depth of decarburized layer, micro-structure etc. In addition, we investigated on characteristics of vibration when automobiles run through various roads, and on the effect of shock absorbers which were used on a bad road.
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