Development of surface temperature evaluation method of rolling bearing inner and outer raceway by the Seebeck effect and law of homogeneous

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03843
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18040:Machine elements and tribology-related
• Research Institution: Kindai University
• Principal Investigator: Tozaki Yasuyoshi 近畿大学, 理工学部, 教授 (60610540)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 転がり軸受 / 温度計測 / 動的熱電対法 / 軌道面 / 真円度 / 軸受隙間 / 滑り

Outline of Final Research Achievements

Deep groove ball bearings are used in a variety of fields, and to improve efficiency, the use of low viscosity oil is progressing, which poses the risk of an increase in raceway surface temperature. The purpose of this study was to measure the bearing raceway surface temperature and find the cause of the temperature rise. From the previous year's research, we found that when the bearing gap becomes wide and uneven, the rolling element slips and the temperature of the bearing raceway surface increases. Therefore, it was concluded that the roundness is a big factor that changes the bearing clearance, and that the precision of the rolling bearing raceway surface affects the temperature rise. In this year's tests, we were able to ensure roundness accuracy by changing the material of the bearing, and we were able to confirm that when the bearing has good accuracy, the gap is stable, so there is no slippage, and the temperature rise is also small.

Free Research Field

機械要素　トライボロジー

Academic Significance and Societal Importance of the Research Achievements

転がり軸受の軌道面温度は，熱電対を用いる方法が主流で計測されてきた．熱電対法であると，真の軌道面では困難であり，また，熱電対を取り付けた位置でのみの計測となり，温度の連続的評価は困難となる．本研究のように，内輪，外輪，転動体の一つを異種金属とする動的熱電対法であれば，真の軌道面の温度を計測することが可能となり，また，転動体の公転に従い，連続的に変化する軌道面温度の計測が可能となり，熱電対法より細かく温度分布や変化を計測することができるため，温度予測手法の高精度化が可能となる．また，世の中の高効率化に伴い，軸受使用環境も厳しくなっており，厳しい状態での温度状態を正確に知ることが可能となる．