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Beveloid gears in planetary gear trains for increased power density and reduced backlash
Swepart Transmiss AB, Liatorp.
Swepart Transmiss AB, Liatorp.
Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
2017 (English)In: INTERNATIONAL CONFERENCE ON GEARS 2017/ INTERNATIONAL CONFERENCE ON GEAR PRODUCTION/ INTERNATIONAL CONFERENCE ON HIGH PERFORMANCE PLASTIC GEARS 2017, VOLS 1 AND 2, V D I-V D E - VERLAG GMBH , 2017, no 1-2, p. 579-590Conference paper, Published paper (Refereed)
Abstract [en]

By using beveloid gears in planetary gear trains it is possible to achieve very equal load sharing between the planet gears also for gear trains with more than 3 planet gears, thus making it possible to increase torque density and reduce weight. The planet gears in conventional planetary gear trains do not carry equal load especially if more than 3 planet gears are used. Even if the space allows more planet gears, the gain in torque transfer may be limited or even decreased if too many planet gears are used. The balance between cost and increased torque density must also be considered when choosing number of planet gears. The load sharing between the gear meshes depends on many factors such as stiffness in the system, difference in gear tooth thickness between the planet gears and position of the planet gears. Multi Body Dynamic simulations have shown that by using beveloid gears and a balancing system creating equal axial force between the axially floating planet gears the transmitted torque will be very equally shared also for high number of planet gears. Compared to general guidelines for calculating the torque distribution factor ky simulations show that a balanced gear train with for example 6 planetary gears may reduce the weight up to 30% for the same torque transfer and ratio compared to a conventional planetary gear train with 3 planet gears. The cost will be almost the same whether 3 or 6 planetary gears are used. In compound planetary gear trains such as the Wolfrom type very high ratios can be reached. This is very attractive in many applications, e.g. in gear boxes used for robotics. By using preloaded beveloid gears the dimension and weight can be reduced and backlash eliminated also over time independent of wear. No service or adjustment is needed. Calculations show a considerable reduction in gear box weight compared to for example cycloid type gear trains which are commonly used today in robotic applications. Planetary gear trains with beveloid gears are also possible to use in gear trains with hollow center. The planet gears are normally most critical as they are subjected to alternating bending loads. By using clean steels e.g IQ-steel from Ovako in the sun and planet gears the dimensions for the planetary gear train can be further decreased.

Place, publisher, year, edition, pages
V D I-V D E - VERLAG GMBH , 2017. no 1-2, p. 579-590
Series
VDI Berichte, ISSN 0083-5560 ; 2294
National Category
Mechanical Engineering
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-69756ISI: 000417013300051ISBN: 978-3-18-092294-2 OAI: oai:DiVA.org:lnu-69756DiVA: diva2:1173357
Conference
International Conference on Gears, SEP 13-15, 2017, Tech Univ Munchen, Garching, GERMANY
Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-12Bibliographically approved

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