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FE analysis of a dog clutch for trucks withall-wheel-drive
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
2010 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesisAlternative title
FE-analys av en klokoppling för allhjulsdrivna lastbilar (Swedish)
Abstract [en]

The thesis is carried out in order to improve the transfer case in trucks with all-wheel-drive. When the truck loses traction at the rear wheels, due to slippery surfaces, wheel-spin occurs. If the driver engages the all-wheel-drive at a point where traction already has been lost, a relative rotational speed in the dog clutch will occur. If this relative speed is too high the dog clutch bounces of itself before coupling or it does not couple at all.

To avoid this problem, the geometry of the teeth is modified. FE simulations are done for the existing model as well as for all the new models in order to find out which of them can handle the highest relative rotational speed.

The results show that the original model is not the best one. Simple modifications of the teeth’s chamfer distance and chamfer angle shows that the dog clutch can handle up to 120 rpm of relative rotational speed whereas the original model only handles 50 rpm.

Abstract [sv]

Examensarbetet är utfört för att försöka förbättra inkopplingen av allhjulsdrift på lastbilar. När en lastbil kör på halt eller löst väglag kan hjulspinn uppstå vid bakhjulen. Om föraren kopplar in allhjulsdriften när hjulen börjat slira uppstår en relativ rotationshastighet mellan halvorna i klokopplingen. Om denna relativa rotationshastighet är för hög kommer halvorna i kopplingen studsa mot varandra innan de kopplas ihop eller inte koppla ihop alls.

För att undvika detta problem har klokopplingens tandgeometri modifierats. FE simuleringar är gjorda på den ursprungliga modellen samt alla nya modeller för att ta reda på vilken som kopplar vid högst relativa rotationshastighet.

Resultaten visar att förbättringar kan göras. Enkla modifieringar på avfasningarnas avstånd och vinklar visar att klokopplingen kan klara upp till 120 rpm i relativ rotationshastighet jämfört med den ursprungliga modellen som endast klarar 50 rpm.

Place, publisher, year, edition, pages
2010. , 70 p.
Keyword [en]
Gleason type curvic coupling, Dog clutch, All-wheel-drive, FE analysis
Keyword [sv]
Klokoppling, Allhjulsdrift, FE-analys
National Category
Mechanical Engineering
URN: urn:nbn:se:lnu:diva-27295OAI: diva2:634202
External cooperation
SwePart Transmisson AB
Subject / course
Mechanical Engineering
Educational program
Mechanical Engineering, Master Programme, 60 credits
Available from: 2013-06-28 Created: 2013-06-28 Last updated: 2013-06-28Bibliographically approved

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