| Summary: | The following report describes the execution of the master’s thesis that constitutes the completion of the masters degree in Mechanical Engineering with specialization in mechanical construction at Luleå University of Technology, Luleå. The work has been carried out by Johan Marklund in close cooperation with JAMA Mining Machines, Skelleftehamn. The main part of the development work has taken place on the premises of JAMA, with only a number of meetings with the external supervisor at Luleå University of Technology. The main goal of this work is to create a new design for the articulated joint in the chassis on which a number of JAMA’s machines is based on. This new construction will withstand higher loads with lower service needs which together gives the machines greater availability. Service and installation should be simplified with the new construction, primarily with respect to the space around and design of components. By using a structured work method called creative product development by Ulrich & Eppinger ensures a high quality throughout the entire process. As a step in this method, a detailed needs analysis was performed in which several, for JAMA, hidden problems and needs were identified. Several different concepts of alternative solutions were created during the work which four were selected for deeper analysis. On those a static stress analysis was conducted and then compared to a reference model based on the existing articulated joint. The final concept was chosen by qualitative selection methods inspired by Ulrich & Eppinger which consists of a number of weighting and selection matrices. These concepts were scored in consultation with the supervisor of JAMA. The winning concept was further developed and constructed on both system- and detail level. The result is a new articulated joint, which significantly reduces the problem areas that the old design had. The critical stress concentrations previously severely limiting the articulated joints life span has now almost decreased by half. ...
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