Purpose

This paper aims to propose a numerical method to calculate the convective heat transfer coefficient of spiral bevel gears under the condition of splash lubrication and to reveal the lubrication and temperature characteristics between the gears and the oil-air two-phase flow.

Design/methodology/approach

Based on computational fluid dynamics, the multiple reference frames (MRF) method was used to simulate the rotational characteristics of gears and the motions of their surrounding fluid. The lubrication and temperature characteristics of gears were studied by combining the MRF method with the volume of the fluid multiphase flow model.

Findings

The convective heat transfer coefficient can be improved by increasing the rotational speed and the oil immersion depth. Moreover, the temperature of the tooth surface having a large convective heat transfer coefficient is also found to be low. A large convection heat transfer coefficient could lead to a good cooling effect.

Originality/value

This method can be used to obtain the convective heat transfer coefficient values at different meshing positions, different radii and different tooth surface positions. It also can provide research methods for improving the cooling effect of gears under the condition of splash lubrication.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0233/

中文翻译：

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基于CFD的飞溅润滑下中间齿轮箱螺旋伞齿轮对流换热系数的计算方法

目的

本文旨在提出一种数值方法来计算飞溅润滑条件下螺旋锥齿轮的对流传热系数，并揭示齿轮与油气两相流之间的润滑和温度特性。

设计/方法/方法

基于计算流体动力学，使用多参考框架（MRF）方法来模拟齿轮的旋转特性及其周围流体的运动。通过将MRF方法与流体多相流模型的体积相结合，研究了齿轮的润滑和温度特性。

发现

对流传热系数可以通过增加旋转速度和浸油深度来提高。另外，还发现对流传热系数大的齿面的温度低。对流换热系数大可能导致良好的冷却效果。

创意/价值

该方法可用于获得在不同啮合位置，不同半径和不同牙齿表面位置的对流传热系数值。它也可以为提高飞溅润滑条件下齿轮的冷却效果提供研究方法。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-07-2020-0233/