Heat transfer at the contact point of rolling and heat generating elements

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04225
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Toyota Technological Institute
• Principal Investigator: Takeno Keiji 豊田工業大学, 工学部, 教授 (70705201)
• Co-Investigator(Kenkyū-buntansha): 古谷 克司 豊田工業大学, 工学部, 教授 (00238685)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 接触熱抵抗 / 球面 / 低圧力雰囲気 / 分子運動 / クヌッセン流

Outline of Final Research Achievements

In order to understand the details of the heat generation pattern due to elastic deformation, the contact point between a flat surface and a sphere was considered as an elemental phenomenon, and a heat transfer model was constructed based on the relationship between temperature measurements and experimental parameters, as well as the effect of ambient pressure. Experiments was conducted in air on the contact heat resistance between a sphere and a flat surface with the upper and lower end surfaces controlled at a constant temperature, measured the temperature distribution inside the sphere and flat surface, obtained the heat flux through the contact point and the contact heat resistance, and constructed a heat transfer model that can describe the relationship between heat conductivity and the contact area, and verified the model by simulation. The model was verified by simulation.

Free Research Field

伝熱

Academic Significance and Societal Importance of the Research Achievements

工作機械など荷重がかかる精密回転体の軸受部分の多くは，ボールねじやベアリング構造となっているが，回転体軸受においてベアリングでの発熱と温度上昇の現象は過去より知られていたものの，近年の工作機械や宇宙機器における要求精度の向上により、ボールの温度管理技術が新たに重要視されている。本研究では，詳細な温度計測と実験パラメータ変化に基づく伝熱モデルの構築を行い，転動体の温度変化に関する予測を可能とした。また宇宙機器を想定し，雰囲気圧力を変化させ，分子流域での接触熱抵抗の貴重なデータが得られた。