Abstract This paper proposes a thermal network model to predict the contact temperature of spur gears. A crucial parameter in gear scuffing evaluation is the contact temperature, which comprises the bulk and flash temperatures. Herein, thermal network models of gear bulk temperature and flash temperature are established, by dispersing tooth into multiple temperature elements connected by the thermal resistances of heat conduction and heat convection. The thermal network model of gear bulk temperature is verified by the finite element model and previous work, and the presented model for gear flash temperature is validated by Blok flash temperature formula. Following ISO standard, gear scuffing is evaluated by comparing the contact temperature with scuffing critical temperature. The effects of geometric and operating parameters on the gear temperature are subsequently investigated. Contact temperature is found to decrease with increased tooth width, pressure angle and module, but increases with increased rotational velocity and input torque. These findings indicate that reasonable geometric and operating parameter matching are beneficial for increasing gear-scuffing resistance.

中文翻译：

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一种预测直齿轮接触温度的新型热网络模型

摘要 本文提出了一种热网络模型来预测直齿轮的接触温度。齿轮磨损评估中的一个关键参数是接触温度，它包括整体温度和闪蒸温度。在此，通过将齿分散成由热传导和热对流热阻连接的多个温度元件，建立齿轮整体温度和闪蒸温度的热网络模型。齿轮整体温度热网络模型通过有限元模型和前人工作进行验证，提出的齿轮闪蒸温度模型通过Blok闪蒸温度公式进行验证。按照 ISO 标准，通过比较接触温度和磨损临界温度来评估齿轮磨损。随后研究了几何和运行参数对齿轮温度的影响。发现接触温度随着齿宽、压力角和模数的增加而降低，但随着转速和输入扭矩的增加而增加。这些发现表明，合理的几何和操作参数匹配有利于提高齿轮抗划伤性。