Prototyp av växelspaksknopp CMG3
2016 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE credits
Student thesisAlternative title
Prototype of a gear knob CMG3 (English)
Abstract [en]
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.
Abstract [sv]
Arbetet har skett i Mullsjö på Kongsberg Automotive (KA). Syftet med studien var att
konstruera en lättmonterad växelspaksknopp till lägsta kostnad utifrån design och
funktionalitet. Detta baserat på konceptgenerering och sållningstekniker. Knoppen
kommer att integreras i en Shift-by-Wire växelspak och tillverkas i SLS prototyper.
Arbetet är en konceptstudie som har följt en abduktiv ansats. Tidigare
konstruktionslösningar har studerats för att få kunskap om hur en knopp utformas.
Koncepten har genererats via brainstorming och har följts upp av parvis viktning.
Koncepten har sedan sållats med hjälp av Pughs matris. Relevant litteratur inom
produktutvecklingsprocesser samt intervjuer med anställda har gett grunden till det
teoretiska ramverket. Handledare har givit sin input under hela arbetsprocessen för att
hjälpa studenterna att välja rätt koncept utifrån monterbarhet, funktionalitet och pris.
Studien har svarat på de tre frågeställningarna som utformats. En knopp i SLS har
konstruerats utifrån enkel montering och demontering som möter företagets
kravspecifikation. Kretskorten inuti knoppen har formats utefter de ingående delarnas
geometrier. Vidare har övergången mellan knopp och centerkonsol resulterat i en
läderdamask.
Studiens resultat kan få konsekvenser i att mer skruv kommer att användas i
prototypfasen vid framtida projekt. Detta kan komma att ändra synen på hur viktigt
monterbarheten kan vara i kommande knoppar. Informationsinsamling har också visat
att snäppen i kromdetaljer lätt går av och detta kan ifrågasätta användningen av dessa.
Vid materialval rekommenderas det att se över konstruktionslösningarna då de
uppnådda egenskaperna kan avvika. Arbetet har utformat konstruktionen så att det
fungerar bra för SLS prototyper men studenterna kan inte garantera att dessa fungerar
om komponenterna ska formsprutas.
Place, publisher, year, edition, pages
2016. , p. 56
Keywords [en]
Mechanical design, gearknob, Shift-By-Wire, SLS-models, mounting
Keywords [sv]
Konstruktion, växelspaksknopp, Shift-By-Wire, SLS-modeller
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:hj:diva-29589OAI: oai:DiVA.org:hj-29589DiVA, id: diva2:910183
External cooperation
Kongsberg Automotive
Subject / course
JTH, Mechanical Engineering
Supervisors
Examiners
2016-04-052016-03-082016-04-05Bibliographically approved