Micromethods for the investigation of lubricating grease composition

1980 ◽  
Vol 16 (10) ◽  
pp. 685-688 ◽  
Author(s):  
L. N. Sosulina ◽  
T. G. Skryabina ◽  
N. K. Volobuev ◽  
G. G. Kotova ◽  
T. K. Ostrovskaya
Keyword(s):  
Lubricating Grease ◽  
Grease Composition

Cavitation Phenomena in Pure-Sliding Grease EHL Films

2010 ◽  
Author(s):  
Takefumi Otsu ◽  
Yuichiro Nagata ◽  
Joichi Sugimura ◽  
Romeo Glovnea
Keyword(s):  
The Other ◽  
Complex Nature ◽  
Operating Parameters ◽  
Lubricating Grease ◽  
Lubricating Oils ◽  
Lubrication Regime ◽  
Ehd Lubrication ◽  
Machine Elements ◽  
Grease Composition

Grease lubricants are widely used in many machine elements which work in elastohydrodynamic (EHD) lubrication regime. They have advantages over lubricating oils, but are prone to starvation, especially when operating at large speeds. At the same time the complex nature of lubricating grease is little understood and only little knowledge about its chemistry and physics is accessible, which makes the prediction of grease film behavior difficult. In the present paper the relation between lubricating grease composition and operating parameters on one hand and the cavitation length on the other, was evaluated.

Die intrinsische Systemreaktion des tribologisch beanspruchten Schmierfettes

2021 ◽  
Author(s):  
Erik Kuhn
Keyword(s):  
Driving Forces ◽  
Observation Point ◽  
Point Of View ◽  
Experimental Results ◽  
Research Paradigm ◽  
Lubricating Grease ◽  
New Research

This article deals with the observed reactions of a lubricating grease to tribological stress. An attempt is made to find the driving forces describe that are responsible for the intrinsic response. From these considerations, a new research paradigm is derived that leaves the traditional observation point of view. The investigations are illustrated with experimental results.

Tribological properties of beef tallow as lubricating grease

2017 ◽  
Vol 69 (5) ◽  
pp. 645-654 ◽  
Author(s):  
Juozas Padgurskas ◽  
Raimundas Rukuiža ◽  
Ihor Mandziuk ◽  
Arturas Kupcinskas ◽  
Katerina Prisyazhna ◽  
...  
Keyword(s):  
Critical Load ◽  
Tribological Properties ◽  
Beef Tallow ◽  
Friction And Wear ◽  
Load Level ◽  
Synthesis Process ◽  
Polymer Additives ◽  
Lubricating Grease ◽  
Content Type ◽  
Thermally Processed

Purpose The purpose of this paper is to report on the tribological properties of beef tallow grease and improvements therein through modification with special processing, polymeric compounds and additives. Design/methodology/approach Pure original beef tallow grease was used as a biological lubricating grease reference material for the tribological research. Beef tallow was modified and synthesized by adding special biological anti-oxidant additives, LZ anti-wear additives, waste polyethylene terephthalate (PET) polymer compounds and thermally processed graphite. Findings Rheometric measurements indicate that the beef tallow grease modification technology used in this study enables control of the synthesis process to produce lubricants with the required microstructure. Investigation results of the tribological properties of differently modified greases show that beef tallow synthesized with polymer additives efficiently operates together with anti-wear additives to reduce friction and wear. The grease compound with thermally processed graphite has good tribological properties at 300 N load levels. The critical load level of lubricating greases could be significantly increased through the use of anti-wear additives and thermally processed graphite. Originality/value Investigation results of the tribological properties of differently modified beef tallow greases show that beef tallow synthesized with polymer additives efficiently operates together with anti-wear additives to reduce friction and wear. The critical load level of lubricating beef tallow greases could be significantly increased using anti-wear additives and thermally processed graphite.

The Elastohydrodynamic Traction of a Grease LGLT2

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Yanshuang Wang ◽  
Pu Li ◽  
JiaWei Cao ◽  
Yan Li
Keyword(s):  
Experimental Data ◽  
Regression Analysis ◽  
Experimental Observation ◽  
Normal Load ◽  
Rolling Speed ◽  
Test Rig ◽  
Lubricating Grease ◽  
Traction Coefficient ◽  
Coefficient Versus

The elastohydrodynamic (EHD) traction coefficients of a lubricating grease LGLT2 were tested at various loads and rolling speeds on a self-made test rig. Traction coefficient versus slide-to-roll ratio curves were generated. Formulae which relate traction coefficient with normal load and rolling speed are put forth. The coefficients of the formulae may be computed by regression analysis of the experimental data. The results show that the calculated traction coefficients agree well with the experimental observation. The critical normal load exists when the traction coefficients change with the normal loads.

Structural Degradation of a Lithium Lubricating Grease after Thermal Ageing

2016 ◽  
Vol 49 (7) ◽  
pp. 579-587 ◽  
Author(s):  
Jiabao Pan ◽  
Yanhai Cheng ◽  
Jinyong Yang
Keyword(s):  
Thermal Ageing ◽  
Structural Degradation ◽  
Lubricating Grease
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