On the Relation between Friction Increase and Grease Thickener Entraining on a Border of Mixed EHL Lubrication

Lubricants

Petr Sperka¹  Tomas Zapletal¹  Ivan Krupka¹  Martin Hartl¹ 

[1] Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic;

关键词: film thickness;    friction;    grease;    base oil;    ehl;   

DOI  :  10.3390/lubricants8020012

来源: DOAJ

【 摘 要 】

This paper deals with an experimental study of film thickness and friction of commercial-grade grease and its base oil in a highly loaded contact. In-situ measurements were conducted for two surface textures on a ball-on-disc optical tribometer at the border of mixed lubrication. At high speeds, the film thickness and the friction of grease correspond with the base oil, while, the thickener enters the contact area and locally affects the film thickness and friction at low speeds. It was found out that the thickener starts to enter the contact area approximately at the same speed when the base oil friction increases on Stribeck curve but without direct solid to solid contact. It indicates that both effects can have the same origin. Change of lubricant flow in contact inlet area was discussed as a possible explanation.

【 授权许可】

Unknown