Prototyp av växelspaksknopp CMG3

Sammanfattning: This study has taken place in Mullsjö at Kongsberg Automotive (KA). The purpose of the study was to evaluate how to construct an easy mountable gearknob to the lowest cost based on design and functionality by using the techniques of concept generation and sifting. The knob is intended to be integrated in a Shift-ByWire shifter and generate prototypes through SLS. Researchers followed a concept study methodology following an abductive approach, to generate an appropriate mechanical design for the gearknob. Concepts were formed by a brainstorming process, followed by weighing criteria for the knob and were finalised by evaluating the formed concepts using a Pughs Matrix constructed by the researches. Relevant literature of mechanical designs processes was reviewed to develop the theoretical framework. In addition, data was collected from Kongsberg´s computer system and unstructured interviews with employees within certain specific areas to gain additional understanding. In cooperation with supervisors, pros and cons analysis of cost, functionality and mounting capability were used to enable the researchers to draw recommendations for mechanical designs meeting the requirements of specification. The study resulted in several findings in relation to each research question. In general, a gear knob has been constructed using SLS that can be both used for mounting and demounting purposes. In addition, this construction met the specification of requirements by KA. The Printed Circuit Board (PCB) were constructed using the geometrics in the inherent components of the knob. The study further resulted in a leather gaiter that were constructed as a link between the dashboard and the knob. Results from this study imply that more screws would be used for mounting different components in the prototype phase, which will impact the view on criteria for forthcoming knobs and their mounting methods. In addition, data collection have also shown that snaps in chromium details easily break, which can also further question the use of chromium snaps for dismantling purposes. Finalised recommendations for the gearknob met the requirements of specification since researchers constructed the most simple mounting on the current surface design. Researchers conclude that these concepts are applicable and could be presented in a following prototype phase. However, if the knob is to be produced, researchers do not have enough support regarding the liquid injection moulding, which requires to be further considered. Materials will require the design constructed in this study to be modified.