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김상기(Sangki KIM),허인호(Inho HUR),사이토료헤이(Ryouhei SAITOU) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Recently, it has been required to be downsizing and weight reduction of automotive automatic transmissions. As a result, planetary carrier which is main transmission mechanism also has been required to have a compact and light weight for highly durable planetary gear. There are various failure modes of planetary gears used in the automatic transmission (refer to Table 1). And the design method of pitting and wear that occurs to tooth surface, and tooth root breakage has already been established as a conventional failure mode. However, for small module planetary gears, it has not been established clearly of design method for spalling (or case crash) failure modes yet. In this paper, we introduce a design method that can predict spalling life quantifiably that is considering not only existing parameters which are shear stress and residual stress but also considering tooth root stress newly.
이춘미(Chunmei Li),송호성(Hosung Song),맹성호(Sungho Maeng),허인호(Inho Hur) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The automatic transmission is composed by many rotating parts transmitting a driving force. Heat is generated by the friction between the rotating parts, and the function of the parts can be degraded due to the heat. Therefore, adequate lubricating oil (oversupply= power losses, undersupply= lack of lubrication) is needed for the friction parts. The amount of lubricating oil is decided by the shape of lubrication flow and lubricant properties and quantity of lubricating oil. For the adequate amount of the lubricating oil without trial and error, lubrication design method should be developed that can consider the above factors. In this study, CFD is used for the lubrication design method to analyze and reflect the above factors, and the result is equivalent to the experiment. In the future, it is expected to be optimization of the lubrication flow design by using this method.