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<div class="section abstract"><span class="label">1</span><div class="htmlview paragraph">In order to reduce the size and weight of the hybrid motor, improving motor cooling performance is essential. Therefore, we have been working on the development.</div><div class="htmlview paragraph">This paper will explain the development of cooling technology TOYOTA has been working on, specifically the evolution of the hybrid motor cooling system and structure from the 1st generation Prius to the current model.</div></div>

Owing to the population aging, it is expected that the number of patients undergoing acetabular bone and hip joint disease will increase. A total hip arthroplasty (THA) is one of the treatments for serious disease of hip joint. However, in the situation of massive acetabular bone loss, an acetabular reconstruction cage is additionally needed to reconstruct the hip joint. In this study, we focus on the acetabular reconstruction cage. The conventional cage is mainly made of metal. However, due to the lack of mechanical biocompatibility, there is a serious problem of 'stress shielding' of metal. The acetabular reconstruction cage made of CFRP could be possible to reduce the stress shielding, but the applicability for strength should be guaranteed. Therefore, the purpose of this study is to develop a numerical modeling method for acetabular reconstruction cage, and estimate the mechanical behaviors of bone and the cage. According to the numerical simulation, relative displacement of CFRP cage to bone was almost the same as Ti-6Al-4V cage. Moreover, strain energy density of CFRP was higher than Ti-6Al-4V in a wide range. Therefore, it was concluded that CFRP enables to design acetabular reconstruction cage which is more excellent for restraint of bone atrophy and promotion of bone remodeling than ready-made without influence on micromovement.