Oil Churning losses in Automatic Transmission

التفاصيل البيبلوغرافية
العنوان:	Oil Churning losses in Automatic Transmission
عناروين إضافية:	Oljeförluster i en automatväxellåda
بيانات النشر:	KTH, Maskinkonstruktion (Inst.) 2013
تفاصيل مُضافة:	DESAI, KAUSHIK
نوع الوثيقة:	Electronic Resource
مستخلص:	Lately the discussion on how big impact vehicles has on the environment has grown bigger and bigger. The vehicle manufacturers are building cars, trucks, and wheel loaders etc. that are getting more and more fuel efficient for every year. But where do the engineers at the companies make the improvements? The drive train is one area of the vehicle where many different sources of losses are found. The gearbox is one example, where the losses are both dependent and independent on the torque transferred by the gear pairs. The gearbox consists of several components that all of them contribute to the total system power loss. It is therefore of great interest to understand the magnitude of the losses in the gears, for different operating conditions, and also to be able to determine how they change with, for instance, rotational speed, oil viscosity. The goal of the master thesis was to make a study about the oil churning losses in a 6 speed automatic gearbox. This model makes use of calculations which were based on scientific experiments. This makes the loss calculations more advanced and accurate than the generalized formulas in most commercial software’s. This model takes into account only the oil churning and oil pocketing losses and shall not hold account for the windage losses or the other losses such as losses occurring due to bearings, seals, pumps etc. Due to time constraint a user friendly programme could not be written but the generated programme can be modified to make it easier for the user to input the data and produce results. All gears are modelled in simple modules built using MATLAB m-codes. Assumptions are made in the code when it came to choosing the oil viscosity. På senare år har diskussionen om fordonens miljöpåverkan blivit allt mer intensiv. Fordonstillverkarna bygger bilar, lastbilar, hjullastare, etc., vars bränsleeffektivitet årligen når nya höjder. Var finns utrymme för förbättringar? Drivlinan är en del av fordonet där många olika förlustkällor påträffas; t.ex. växellådan, där förlusterna både är beroende och oberoende av det vridmoment som överförs av kugghjulsparen. Växellådan består av ett flertal komponenter som bidrar till systemets totala effektförlust. Det är därför av stort intresse att förstå omfattningen av förlusterna i kugghjulen, för olika driftsförhållanden, och att kunna bestämma hur förlusterna är relaterade till t.ex. rotationshastighet och oljeviskositet. Målet med examensarbetet var att göra en undersökning om oljeskvalpförluster (”oil churning losses”) i en 6-växlad automatlåda. Modellen använder beräkningar baserade på vetenskapliga experiment. Detta gör förlustberäkningarna mer avancerade och exakta än de allmänna formler som de flesta kommersiella programvaror nyttjar. Modellen tar endast hänsyn till oljeskvalpförluster och oljeficksförluster (”oil pocketing losses”) och tar icke hänsyn till vindförluster eller andra förluster såsom lagerförluster, friktion i tätningar, pumpförluster, etc. På grund av projektets tidsramar har förfiningen av programmets användargränssnitt prioriterats lågt; vid behov kan detta åtgärdas för att förenkla input och output av data. Alla kugghjul modelleras i enkla moduler som byggts som MATLAB-skript. Antaganden görs i koden när det gäller oljans viskositet .
مصطلحات الفهرس:	Automatic transmission, oil churning loss, oil pocketing loss, planetary gear, Automatlåda, oljeförluster, oljeskvalpförluster, planetväxel., Engineering and Technology, Teknik och teknologier, Student thesis, info:eu-repo/semantics/bachelorThesis, text
URL:	http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141768 MMK 2013:30 MKN 081
الإتاحة:	Open access content. Open access content info:eu-repo/semantics/openAccess
ملاحظة:	application/pdf English
أرقام أخرى:	UPE oai:DiVA.org:kth-141768 1233742100
المصدر المساهم:	UPPSALA UNIV LIBR From OAIster®, provided by the OCLC Cooperative.
رقم الأكسشن:	edsoai.on1233742100
قاعدة البيانات:	OAIster

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