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Planetväxelinnovation: Planetväxel med cylindriska kuggar
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2011 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Planetary gear innovation : Planetary gear train with cylindrical gears (English)
Abstract [sv]

I den här rapporten presenteras en ny typ av planetväxel. Rapporten är en fortsättning på föregående års kandidatarbete Planetväxelinnovation – En studie i hur omkonstruktion av planetväxlar medför effektivare tillverkning (Allvar, Engel, & Karlsson Öhrvall, 2010). Arbetet grundar sig i att konventionella planetväxlars ytterringar är dyra att tillverka, delvis på grund av att de måste härdas efter formgivning. Härdningen gör att ringen blir skev och att den i vissa fall behöver efterbehandlas. Föregående års kandidatarbete hittade två potentiella lösningar till detta problem varav den ena, som vi valt att gå vidare med, var att ha cylindriska kuggar i en ytterring med enklare geometri för härdning. Denna potentiella lösning utreds vidare i denna rapport där formgivning och geometrier för planetväxeln tagits fram i sin helhet.Resultatet i rapporten är en planetväxel med kedjeväxel. Ytterringen har alltså bytts ut till en fixerad stel kedja med cirkulär form, en slags metallring med rullar i. Planethjulen har vidare fått formen av kedjekugghjul samtidigt som solhjulet kan liknas vid ett hamsterhjul, alltså liknande ytterringen fast med kuggingreppet på utsidan av ringen. Rapporten beskriver hur formerna för planetväxeln tagits fram analytiskt och med hjälp av operationer i MATLAB. Illustrationer och animeringar i MATLAB och CAD hjälper också till att beskriva den framtagna planetväxelns beteende.

Abstract [en]

This report investigates a new type of planetary gear that was initiated by last year's candidate's work, Planetary gear innovation – A study of how redesigning planetary gears leads to more efficient manufacturing (Allvar, Engel, & Karlsson Öhrvall, 2010). Instead of using gear teeth rollers are used for the internal ring wheel. The investigation is based on the fact that the outer ring is expensive to produce due to form changes after hardening, which means that further operations is needed in order to reduce the deformations. Allvar et al. concluded that the outer ring supporting the rollers does not need to be hardened, which can be advantageous for reducing form variations. This was investigated further and a new planetary gear set has been developed.This work has resulted in a planetary gear with chain drive. The outer ring has been replaced by a chain of rigid rollers mounted in metal rings. The planetary gear profile has received the profile by using the outer ring as tool. The sun gear has the same appearance as the outer ring and can be seen as a hamster wheel. In this report the method and simplifications used for designing this new type of planetary gear is described in detail.

Place, publisher, year, edition, pages
2011. , 67 p.
Series
MMKB 2011:60 MKNB 043
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-51366OAI: oai:DiVA.org:kth-51366DiVA: diva2:464031
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-05-28 Created: 2011-12-12 Last updated: 2013-05-28Bibliographically approved

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