Liquid/Solid Transition Lubrication in Hertzian Contacts

赫兹接触中的液/固转变润滑

• 批准号: 03650131
• 负责人: OHNO Nobuyoshi
• 金额: $ 1.34万
• 依托单位: Saga University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650131/
• 关键词: Herzian contact; Lubrication regimes; Bulk modulus; Free volume; Traction; Ball bearings; Lubricant properties; Liquid; Solid transition Lubrication; ガラス転移; 潤滑油

(1) The observed minimum film thickness at a rolling contact is plotted in the form of the Greenwood diagram. In the solidification ranges VE (Viscoelastic) and EP (Elastic-Plastic) larger thickness is formed. The upper parts of these thickness curves are limited by the boundary of the PR (Piezoviscous rigid) range defined by Houpert.(2) In the case of traction oils bearing life is hardly related with the film parameter in contrast to mineral oils, which show a general feature that bearing life increases with increasing film parameter.(3) Traction oils having larger pressure-viscosity coefficients and higher coefficients of traction are easily solidified under the operating conditions of bearings.(4) In the case of thrust ball bearings the merit of the solidified films is rather little recognized. They shorten bearing life, increase friction and operating temperature. These facts are related with bulk moduli of solidified films.(5) Demerits of traction oils are attributed to severe operating conditions of thrust ball bearings, which are strongly affected by the presence of spin moment.(6) The solidified oil films of traction oils easily cause breakdown owing to their brittle nature. The brittleness shows a relation reversed to the bulk modulus. It is estimated by measuring the temperature difference between solidified and failure temperature at lowering temperatures.(7) By raising operating temperatures by external heating bearing life is rapidly shortened as the product of the pressure-viscosity coefficient and the average contact pressure is reduced considerably lower than the critical value 25, i.e. necessary to maintain the elastic plastic state.

(1)在滚动接触处观察到的最小膜厚以格林伍德图的形式绘制。在凝固区VE(粘弹性)和EP(弹塑性)形成较大的厚度。这些厚度曲线的上半部分受Houpert定义的PR(压粘刚性)范围边界的限制。(2)与矿物油相比，牵引油的轴承寿命与油膜参数几乎没有关系，矿物油表现出轴承寿命随油膜参数增加而延长的一般特征。(3)在轴承的运行条件下，具有较大压粘系数和较高牵引系数的牵引油很容易固化。(4)在推力球轴承的情况下，凝固膜的优点很少被认识到。它们缩短了轴承寿命，增加了摩擦力和工作温度。(5)牵引油的缺陷是由于推力球轴承工作条件恶劣，受自转力矩的影响较大。(6)牵引油的凝固油膜因其脆性而容易发生故障。脆性与体积弹性系数成反比关系。通过测量在较低温度下凝固温度和失效温度之间的温差来估算。(7)通过外部加热提高工作温度，轴承寿命迅速缩短，因为压力-粘滞系数与平均接触压力的乘积大大低于保持弹塑性状态所必需的临界值25。

项目成果

大野 信義: "高圧固化油の機械的性質とクリープ挙動について" 日本潤滑学会トライボロジー会議予稿集東京. 247-250 (1992)

Nobuyoshi Ohno：“高压固化油的机械特性和蠕变行为”日本润滑学会摩擦学会议论文集，东京 247-250 (1992)。

N.Ohno: "Bulk Modulus of Solidified Oil at High Pressure as Predominant Factor Affecting Life of Thrust Ball Bearings" STLE 1993 Annual Meeting,Calgary,Canada. (1993)

N.Ohno：“高压固化油的体积模量是影响推力球轴承寿命的主要因素”STLE 1993 年会，加拿大卡尔加里。

K. Cosstick: "Pressure Effects on Thermal Isomerization in Highly Viscous Media. The First Clear-Cut Example of Viscosity-Induced Retardation of "Slow) Thermal Reactions" High Pressure Research:An International Journal. (1993)

K. Cosstick：“压力对高粘性介质中热异构化的影响。“慢）热反应的粘度引起的延迟的第一个清晰示例”高压研究：国际期刊。（1993 年）

平野 冨士夫: "トラクション油の自由体積に及ぼす溶解空気の影響" 日本潤滑学会トライボロジ-会議予稿集(東京 1992ー5). (1992)

Fujio Hirano：“溶解空气对牵引油自由体积的影响”日本润滑学会摩擦学会议论文集（东京 1992-5）（1992 年）。

N.Ohno: "Diagrams for Estimation of the Solidified Film Thickness at High Pressure EHD Contacts" 20th Leeds-Lyon Symposium on Tribology,Lyon. (1993)

N.Ohno：“高压 EHD 接触处固化膜厚度的估计图”第 20 届利兹-里昂摩擦学研讨会，里昂。