<p>This thesis has the overall objective to develop the optimum sealing system between the retarder and transmission. Today, there is a pressure-relief and two radial seals separation between the retarder and transmission. It has been found that carbon residue formation may occur between retarder axle and seal lips with, in some cases, leakage as a result.</p><p>We have in this thesis tried to explain the phenomenon of carbon residue, how it is formed and why it can be seen just on the seals? A rig test was conducted where we show how friction, speed, transmission temperature and mitigation phases of the retarder affects temperatures in the sealing environment. Factors affecting the coke structure are reported, together with proposals for measures that provide a mitigating seal environment. The material is PTFE, which is standard in the seals today; we believe meets all requirements for the sealing material.</p><p>The final recommendation is a tripartite cooperation between Scania, a petroleum company and an additive manufacturer where the different base oils and additive tested as multi-factorial experiments to identify what gives the best results. On transmission side we recommend to ensure a constant oil flow to the seal.</p>

This thesis has the overall objective to develop the optimum sealing system between the retarder and transmission. Today, there is a pressure-relief and two radial seals separation between the retarder and transmission. It has been found that carbon residue formation may occur between retarder axle and seal lips with, in some cases, leakage as a result. We have in this thesis tried to explain the phenomenon of carbon residue, how it is formed and why it can be seen just on the seals? A rig test was conducted where we show how friction, speed, transmission temperature and mitigation phases of the retarder affects temperatures in the sealing environment. Factors affecting the coke structure are reported, together with proposals for measures that provide a mitigating seal environment. The material is PTFE, which is standard in the seals today; we believe meets all requirements for the sealing material. The final recommendation is a tripartite cooperation between Scania, a petroleum company and an additive manufacturer where the different base oils and additive tested as multi-factorial experiments to identify what gives the best results. On transmission side we recommend to ensure a constant oil flow to the seal.

This thesis is about product and process development. The thesis has been done at ABB Robotics AB in Västerås under 20 weeks with half study pace, which is equivalent to 15 higher education credits (15hp). Thesis purpose was to improve an assembly station for assembling of robot IRB 360. Problems at the assembly station are that there are some non-value-creating activities and assembling methods which correspond to low safety factor for workers. The focus of thesis was to investigate opportunities and to produce solid proposals for how to eliminate these problems. After a written contract with ABB AB, the work started with the planning with the company supervisor and Gantt Schema was created to schedule all steps for this project, to ensure during the process. The project has followed the methods described in the book "Produktutveckling konstruktion och design " by Karl T Ulrich &amp; Steven D Eppinger. Product development tools like Quality function deployment (QFD), functional analysis, specification of requirement and Pugh's analysis matrix have been used in the development process. In the first phase of the project, observation and investigation has been performed to identify and analyse problems. In the later phases, ideas and concepts has created to solve the problems and achieve successful results. The result of the project is an improved material flow at assembling stations which eliminates nonvalue-creating activities and leads to better safety for workers. Another result of the project is an elimination of hand hammering at assembling station and for this purpose a new pressing tool has been developed for pressing down a seals around radial shaft in assembling process. The software Solidworks has been used to create a new 3D layout for the existing assembly station to understand and find the better solution for material flow. Solidworks is also used for doing Finite element method (FEM) analysis to validate the new developed pressing tool. / Detta examensarbete handlar om produkt och processutveckling. Arbetet utfördes hos ABB Robotics AB i Västerås och bedrivs under 20 veckor långt på halvfart vilket motsvarar 15 högskolepoäng. Uppdraget är att förbättra en monteringsstation för plockningsrobot IRB360 FlexPicker. Problem på monteringsstation är att det sker icke värdeskapande aktiviteter, och monteringsprocess som leder till arbetsmiljöproblem. Arbetet fokus var att undersöka möjligheter och ta fram konkreta förslag att hur man kan eliminera dessa problem. Efter skriftligt kontrakt med ABB AB, arbetet började med planeringen med företaget handledare och skapades Gantt Schema. Projektet har följt metoderna som beskrivs i boken ”Produktutveckling konstruktion och design” av författare Karl T Ulrich &amp; Steven D Eppinger. I utvecklingsprocessen har använt produktutvecklingsverktyg, några av dessa är QFD, funktionsanalys, kravspecifikation och Pughs analysmatris. I första fas av projekt gjorde undersökning och observation för att hitta och analysera problem. I senare faserna genererade koncepter för åtgärden och sedan vidare utvecklades utvalda koncept för nå framgångsrikt resultat. Resultatet av arbetet blev förbättrad materialflöde som eliminerar icke värdeskapande aktiviteter. Dessutom utvecklades fram ett nytt pressverktyg som eliminerar arbetsmiljöproblem. Mjukvaran Solidworks har använt för att skapa en ny layout för monteringsstation. Med hjälp av Solidworks gjordes FEM -analys (Finita elementmetoden) för att validera den nya pressverktyg