Effect of Solidification Characteristics of Lubricants on Lubricating Performance Under EHL Condition

EHL条件下润滑油凝固特性对润滑性能的影响

• 批准号: 01550119
• 负责人: YAMAMOTO Yuji
• 金额: $ 1.15万
• 依托单位: Kyushu 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: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550119/
• 关键词: Tribology; EHL; Lubricant; Solidification; Critical shear stress; Glass transition; 弾性流体潤滑; トラクション; 粘弾性; 弾塑性

Lubricants behaved as elastic-plastic solid at temperatures below their glass transition temperatures in shear ring tests carried out with a concentric double cylinder apparatus. In the temperature range a lubricant were sheared only within a narrow shear band in the vicinity of the inner cylinder surface. There was a critical shear stress, of which the magnitude decreased with the sliding velocity. A lubricant with high traction coefficient in two disc machine testing had a large critical shear stress.In four ball testing, the lubricant with the lowest solidification pressure made the thickest oil film. Once a thick solidifies film was formed under a condition of high sliding velocity, the thick film was retained and had an ability to prevent the rubbing surfaces from direct contact even when the sliding velocity was decreased.Under rolling/sliding contact conditions, in contrast to viscous fluid the traction coefficient decreased with an increase in the shear rate or the sliding velocity in cases where the lubricant behaved as a elastic-plastic solid. The traction coefficient of the elastic-plastic solid could be practically determined only by the value of ap, where a is the viscosity-pressure coefficient of the lubricant and p the mean contact pressure. The ap seems to be a measure of the packing state of the lubricant molecules in the contact region.

在使用同心双缸装置进行的剪切环测试中，润滑剂在低于其玻璃化转变温度的温度下表现为弹塑性固体。在该温度范围内，润滑剂仅在内筒表面附近的窄剪切带内被剪切。存在临界剪应力，其大小随着滑动速度的增加而减小。在二盘机试验中牵引系数高的润滑剂具有较大的临界剪切应力。在四球机试验中，具有最低凝固压力的润滑剂形成最厚的油膜。一旦在高滑动速度条件下形成厚的固化膜，厚膜就会被保留，并且即使在滑动速度降低时也具有防止摩擦表面直接接触的能力。在滚动/滑动接触条件下，与对于粘性流体，在润滑剂表现为弹塑性固体的情况下，牵引系数随着剪切速率或滑动速度的增加而降低。弹塑性固体的牵引系数实际上只能由 ap 值确定，其中 a 是润滑剂的粘度压力系数，p 是平均接触压力。 ap 似乎是接触区域中润滑剂分子堆积状态的量度。

项目成果

T. Sakai, T. Murakami, Y. Yamamoto et al.: "A Naphthenic Oil of Hydrogenated Coal-Tar Pitch as a Lubricant" Proc. 5th Intern. Congress on Tribology. 4. 245-250 (1989)

T. Sakai、T. Murakami、Y. Yamamoto 等人：“氢化煤焦油沥青的环烷油作为润滑剂”Proc。

山本 雄二: "Tractional Characteristics of a Naphthenic Oil of Hydrogenated CoalーTar Pitch," Proceedings of the Japan International Tribology Conference Nagoya,1990. 3. 1725-1730 (1990)

Yuji Yamamoto：“氢化煤焦油沥青环烷油的牵引特性”，日本国际摩擦学会议名古屋会议记录，1990 年 3. 1725-1730 (1990)。

山本雄二,橋本正明: "潤滑油の高圧下におけるトラクション特性の経時変化" トライボロジスト(日本潤滑学会誌). 35. (1990)

Yuji Yamamoto、Masaaki Hashimoto：“高压下润滑油牵引性能随时间的变化”摩擦学家（日本润滑学会杂志）35。（1990）。

山本 雄二: "Changes in Traction of Lubricants during Test Runs at High Pressures" Japanese Journal of Tribology.

Yuji Yamamoto：“高压试运行期间润滑剂牵引力的变化”日本摩擦学杂志。

T. Sakai, T. Murakami, Y. Yamamoto: "Lubricating Performance of a Naphthenic Oil of Hydrogenated Coal Tar Pitch with Low Solidification Pressure" Proc. Jpn Intern. Tribology Conf. Nagoya. 3. 1719-1724 (1990)

T. Sakai、T. Murakami、Y. Yamamoto：“低凝固压力氢化煤焦油沥青环烷油的润滑性能”Proc。