There is always a desire to develop and offer the best and most protable products on the market. This master thesis in mechanical engineering investigates the possibility to reduce the costs of the bogie suspension on Volvo's articulated haulers. The so called stays in the existing bogie suspension are significant components that connects the axle housings to the frame. The existing solution consists of stays that are expensive, heavy and time consuming to manufacture. Concepts in CAD will be compared to each other and and all concept will be evaluated in more detail. Totally five concepts were generated and modelled. They were compared regarding strains on rubber parts, required stay dimensions, collision between different parts and axle movements. Two proceeded concepts for further development after the evaluation and two new concepts were generated. A new comparison was made with additional tests. Simulations conrmed that it was only possible to proceed with one of the two developed concepts because one of the concepts would require large dimensions to manage the applied forces. The selected concept was redesigned and adapted to be as realizable as possible. Bushing kits, reinforcements, and detailed designs of parts were considered. Simple FEMcalculations was only made on parts that wasn't depending on components on the frame since these calculations would be too advanced and time consuming. The resulting concept needs more work to be realizable since there are geometry optimization on molded components left as well as advanced calculations when integrating the solution on the frame. A weight loss ofapproximately 95kg and a cost reduction of 3700SEK was made. Further investigations has to be done to determine if it's possible to obtain a positive business case with the new bogie suspension.

La réduction des coûts de maintenance est l’un des enjeux majeurs auquel doit faire face l’industrie ferroviaire pour rester concurrentielle. Parmi les organes de suspension nécessitant un entretien périodique fréquent, les éléments à base métal-caoutchouc jouent un rôle clé dans le fonctionnement du bogie. Les variations des propriétés mécaniques de ces éléments sont étudiées au travers de techniques de vieillissement accéléré pour représenter leur comportement tout au long du cycle de vie. Par ailleurs, des outils de description des variabilités observées sont proposés afin d’établir une stratégie de simulations dynamiques en considérant différents modèles d’un matériel roulant homologué. L’objectif est de quantifier leurs effets sur des indicateurs sécuritaires préconisés par les normes du secteur ferroviaire. Finalement, cette étude permet de justifier la pertinence d’une stratégie d’allongement de cycle de vie en maintenant le niveau de sécurité inhérent au matériel roulant ferroviaire. / The reduction of maintenance costs is a key stake for the competitivity of railway rolling stock manufacturers. The optimization of maintenance operations can be addressed by less, better-planned overhaul operations, through an increase of the life-cycle of some components. Among the most frequently checked suspension organs, rubber-to-metal elements have a key role on the bogie performance. The change on the mechanical properties of these elements are studied by accelerated ageing techniques, so as to represent their behaviour throughout their lifecycle. Several hyper-elastic laws, associated with the characterization of the rubber ageing, have been proposed in these works. These models have been used to simulate the behaviour of the real components. Hence, a set of tools describing the variability observed on the parts is proposed, allowing the design of a strategy for dynamics simulations considering several models of an already approved rolling stock model. The aim is to quantify the variability effect on the safety indexes demanded by standard norms. Finally, this study justifies the pertinence of a strategy aiming life-cycle extensions while ensuring the intrinsic safety levels required on railway rolling stock.