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Prototyp av växelspaksknopp CMG3
Jönköping University, School of Engineering, JTH, Mechanical Engineering.
Jönköping University, School of Engineering, JTH, Mechanical Engineering.
2016 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent 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. , 56 p.
Keyword [en]
Mechanical design, gearknob, Shift-By-Wire, SLS-models, mounting
Keyword [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: diva2:910183
External cooperation
Kongsberg Automotive
Subject / course
JTH, Mechanical Engineering
Supervisors
Examiners
Available from: 2016-04-05 Created: 2016-03-08 Last updated: 2016-04-05Bibliographically approved

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