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An quantitative analysis for unsteady partial-EHL and experimental discussion

非定常部分EHL的定量分析及实验讨论

基本信息

批准号：
06452166
负责人：
NAKAHARA Tsunamitsu
金额：
$ 0.64万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

The purpose of this study is to get a useful analysis model for dynamically loaded mixed lubricated machine elements with concentrated contact. In this report, a new numerical model has been developed and some experiments have been done to obtain the prosperity of the model.First, a steady state analysis based on thermal elast-hydrodynamic mixed Lubrication theory (TEHML) is introduced. It considers thermal effects of lubricant visco-elasticity and heat at contact area. In this analysis, not only equations of the elast-hydrodynamic mixed lubrication (EHML) but also energy equations of lubricant film are used. Results of pressure, temperature distribution and friction coefficient are presented. Results of this calculation are compared with those of normal EHML,so film thickness by TEHML calculation is more thin than that by normal EHML calculation. At low slip ratio, friction of TEHML calculation is more large than that of normal calculation. It means thermal calculation for dynamically loaded mixed lubricated machine elements with concentrated contact is important.Second, for example of dynamically analysis, friction and lubrication between cam and follower has been calculated including equations of motion of cam, and squeeze effect for lubricant film. In this calculation, At the point near cam nose where the load significantly changes, the effects of fluid adiabatic change can not be neglected.Cam and follower friction experiments has been done to valid the calculations. Friction of caluclations accord with that of experiments. But the test equipment (type I) was not enough rigid, it was influenced natural vibration, so type II equipment has been developed.

本研究的目的是建立一个有用的集中接触动加载混合润滑机械元件的分析模型。本文建立了一种新的数值模型，并进行了一些实验，以验证该模型的有效性。首先，介绍了基于热弹性-流体动力混合润滑理论的稳态分析方法。它考虑了润滑剂的粘弹性和接触区热的热效应。在分析中，不仅使用了弹性-流体动力混合润滑方程，而且还使用了润滑膜的能量方程。给出了压力、温度分布和摩擦系数的计算结果。将计算结果与常规EHML计算结果进行了比较，结果表明，采用TEHML计算的膜厚比常规EHML计算的膜厚更薄。在低滑移比下，TEHML计算的摩擦力比常规计算的摩擦力大。这意味着对集中接触的动载混合润滑机械元件进行热计算是十分重要的。其次，以动力学分析为例，计算了凸轮与从动件之间的摩擦和润滑，包括凸轮的运动方程和润滑膜的挤压效应。在此计算中，在载荷变化较大的凸轮鼻附近，流体绝热变化的影响不容忽视。通过凸轮与从动件的摩擦实验验证了计算结果。计算结果与实验结果吻合。但由于ⅰ型试验设备刚性不够，受固有振动的影响，研制了ⅱ型试验设备。