Purpose

Under-race lubrication can increase the amount of lubricating oil entering a bearing and greatly improve lubrication and cooling effects. The oil-air two-phase flow and heat transfer characteristics inside a ball bearing with under-race lubrication play a key role in lubrication and cooling performance. The purpose of this paper is to study these two characteristics, and then provide guidance for lubrication and heat dissipation of bearing with under-race lubrication.

Design/methodology/approach

In this paper, a simplified three-dimension heat transfer model of ball bearing with under-race lubrication is established; the coupled level set volume of fluid method is used to track the oil-air two-phase flow, and the Palmgren method is used to calculate the heat generation. The influence of rotation speed and inlet velocity on oil volume fraction, temperature and convection heat transfer is investigated. A temperature test for under-race lubrication is carried out.

Findings

Because of the centrifugal force, lubricating oil is located more on the outer ring raceway. As the rotation speed decreases and the inlet velocity increases, the oil volume fraction increases and the temperature decreases. Furthermore, the area with high oil volume fraction has a large convection heat transfer coefficient and low temperature. The error between the simulation temperature and the test temperature is within 10%.

Originality/value

The research on the temperature field and convection heat transfer characteristics of under-race lubrication ball bearings at different rotation speeds and inlet velocities is rarely involved.

中文翻译：

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滚道下润滑球轴承油气两相流温度场及对流换热分析

目的

下圈润滑可以增加进入轴承的润滑油量，大大提高润滑和冷却效果。带下圈润滑的球轴承内部的油气两相流动和传热特性对润滑和冷却性能起着关键作用。本文的目的是研究这两个特性，进而为带下圈润滑的轴承的润滑和散热提供指导。

设计/方法/方法

本文建立了带下圈润滑的球轴承的简化三维传热模型；采用耦合水平集流体体积法跟踪油气两相流动，采用Palmgren法计算发热。研究了转速和入口速度对油体积分数、温度和对流传热的影响。进行了下滚道润滑的温度测试。

发现

由于离心力的作用，润滑油更多地位于外圈滚道上。随着转速的降低和入口速度的增加，油的体积分数增加，温度降低。此外，油体积分数高的区域对流换热系数大，温度低。模拟温度与测试温度的误差在10%以内。

原创性/价值

对不同转速和入口速度下圈下润滑球轴承的温度场和对流传热特性的研究鲜有涉及。