Den här rapporten handlar om ett maskintekniskt konstruktionsprojekt som framtagits av Christian Wikman och Oliver Öhman. Det är ett uppdrag som givits av EcoistVehicleTM för att slutföra högskoleingenjörsexamen inom maskinteknik vid Högskolan i Halmstad. Princip- och Primärkonstruktion (Olsson, 1995), Fundamentals of Vehicle Dynamics (Gillespie, 1992) och en stor mängd egen sökning har använts som grund till metoden som använts under projektets gång.   EcoistVehicleTM är ett fordonsprojekt som startats av Thomas Koch. Det är en eldriven, singelsits och trehjulig bil med ett drivande bakhjul. Idén bakom bilen är att transportera föraren till sin destination på ett miljövänligt sätt. Bilen är lämpad till landsbygd och pendling med en räckvidd på 40-50km. Syftet med uppdraget som gavs våren 2017 var att hitta snabbare metoder att konstruera och tillverka en svingarm till fordonet.   Uppdraget som gavs var att konstruera och möjligtvis tillverka en svingarm för det drivande bakhjulet som skall passa in på bilens dimensioner samt ha en relativt snabb tillverkningsprocess för en produktionsserie på 10-20 bilar. Uppdragsgivarens önskemål var att 3D-printa ut de större delarna av svingarmen och sedan efterbearbeta monteringsdelar och passytor med fräsning. Flera tillverkningsprocesser som används inom fordonsindustrin för framtagning av motorcykelsvingarmar har setts över och jämföras för att få fram den metod som passar detta projekt.   Det som författarna bidragit med till projeketet är en högre kunskap om 3D-printning av metall, då specifikt aluminium, olika koncept för tillverkning samt analyser av konstruktionen för att testa hållfasthet till den slutgiltiga produkten. / This report will be about a mechanical design project that has been developed by Christian Wikman and Oliver Öhman. The assignment was given by EcoistVehicleTM to complete a bachelor’s degree in mechanical engineering at Halmstad University. Princip- och Primärkonstruktion (Olsson, 1995), Fundamentals of Vehicle Dynamics (Gillespie, 1992) and a large amount of research on the web has been used as the foundation for the method that’s been used all through this project.   EcoistVehicleTM is a vehicle project started by Thomas Koch. It is an electrically powered, single seat, three wheeled vehicle that's driven by a single rear wheel. The idea behind the car is to transport the driver to his destination in an environmentally friendly way. The car is suited for commuting in the countryside with a range of 40-50km. The purpose of the assignment that was given in the spring of 2017 was to look into faster methods of designing and manufacturing a swingarm for the vehicle.   Our assignment was to design and possibly manufacture a swingarm for the driving rear wheel that should fit the specifications of the car and have a relatively fast manufacturing process for a series of 10-20 cars. Our mentor and taskmaster has a request to 3D-print the larger parts of the swingarm then after work the mounting surfaces and mating surfaces with milling. Several manufacturing processes used in the automotive industry for the production of motorcycle swingarms will be screened and compared to get the method that will fit this project.   The authors have contributed with a higher knowledge of 3D-printing, specifically aluminum, different design concepts together with analysis of the design to test the solidity of the final product.

This report is about a construction project carried out in collaboration with an electric car developer of a three-wheeled vehicle to fit the production version, improve production conditions and ease of use. The project was carried out together with the electric car developer, Ecoists, founder Thomas Koch who is an experienced engineer with a great passion for his product. The project includes a study of different types of swing arms and its advantages and disadvantages from both a manufacturing and a user point of view. The project group then evaluates these and finally chooses to continue the development of a single-sided swingarm of welded profiles as the project group considers it to be the most suitable design in terms of user-friendliness, production conditions and economy. Subsequently, CAD data is created for the final design. On this, finite element calculations are performed to optimize the design after calculated load cases and then modified to improve the design. This concludes with a first edition in the form of drawing data for cost calculations and prototype production. The project group also reports on surrounding factors that affect the development of the swingarm, its surrounding components and investigation of the self-production of an eccentric hub in relation to acquiring a finished component. The report also includes a brief study of the impact of design and manufacturing on social, economic, environmental and work environment aspects.