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This paper examines solid additives as a function of contamination of lubricant to explore and evaluate the influence on the frictional coefficient. Silica sand with different particle sizes and Fe powder all at five concentration levels were used to
This paper is the second in a series that examines grease lubrication mechanisms and failure in rolling element bearings. The aim of the work was to understand the grease condition changes during use and the relationship to lubrication performance
With the aid of specific test device, twelve harmonic drive gears whose inner fexspline diameter is 60mm and . reduction ratio is 200:1, were divided into four groups to estimate their performance degradation and life under four kinds of output torque stress respectively in vacuum.
Read "The influence of bearing grease composition on friction in rolling/sliding concentrated contacts, Tribology International" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
A microbubble phenomenon induced by micro-oscillation in the grease lubricating film confined within a nanogap between a highly polished steel ball and a smooth glass disc has been observed with an interferometer. Experimental results show that when the micro-oscillation frequency is a constant ...
where ∆ is the net penetration and S g is the generated entropy. Parameters m and b are unique for each grease. For example for Grease A, m=4.162 and b=0.71 mm (see Fig. 3) .When a grease has a smaller m value, its net penetration is less affected by the change in the entropy generated inside the grease during a shear process. Thus, the slope of the characteristic line shows the durability ...
The research paper published by IJSER journal is about DEVELOPING THE TRIBOLOGICAL PROPERTIES OF LITHIUM GREASES TO WITHSTAND ABRASION OF MACHINE ELEMENTS IN DUSTY ENVIRONMENT ... Cann P. M. “Grease degradation in a bearing simulation device”, TribolInt; 39, pp. 1698 – 1706, (2006).
A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.
Grease is degraded during use in rolling element bearings and as a result the lubrication performance can deteriorate. Under severe conditions this can result in lubrication failure and, thus, the ...
The invention relates to a method of predicting when a grease in a grease-lubricated rolling element bearing ( 10 ) will reach an unacceptable condition. According to the invention, a time series of a parameter is measured and recorded, whereby the parameter is directly or indirectly indicative of a degree of breakdown of a lubricant film separating the rolling contacts.
Modeling of the Non-Linear Rheological Behavior of a Lubricating Grease at Low-Shear Rates José M. Madiedo , José M. Franco , Concepción Valencia and Crı́spulo Gallegos [ + - ] Author and Article Information
Stuttgart/Ostfild- observed for the methyl and methylene groups character- ern, Germany (2008) istic for lithium 12-hydroxystearate molecules. This con- 10. Paszkowski, M.: Some aspects of grease flow in lubrication systems and friction nodes.
Bearing performance limits with grease lubrication: the interaction of bearing design, operating conditions and grease properties. P M E Cann 1 and A A Lubrecht 2. Published 30 August 2007 • 2007 IOP Publishing Ltd Journal of Physics D: Applied Physics, Volume 40, Number 18
Biocides are critical components of hydraulic fracturing (“fracking”) fluids used for unconventional shale gas development. Bacteria may cause bioclogging and inhibit gas extraction, produce toxic hydrogen sulfide, and induce corrosion leading to downhole equipment failure. The use of biocides such as glutaraldehyde and quaternary ammonium compounds has spurred a public concern and debate ...
Stuttgart/Ostfild- observed for the methyl and methylene groups character- ern, Germany (2008) istic for lithium 12-hydroxystearate molecules. This con- 10. Paszkowski, M.: Some aspects of grease flow in lubrication systems and friction nodes.
Abstract. A ball-disc traction test rig is improved through the development of a lubricant traction measurement system, consisting of a resonance force sensitive quartz sensor, a circuit of the sensor and a rigid bracket jointed by a frictionless hinge.
Lubricant film thickness and friction were measured for different grease thickener types in a bearing simulation device. The results showed that the greases formed thick (20–80nm), low friction surface layers at low speeds, which were much greater than the corresponding base oil film. ... P. M. Lugt, R . Bosman, C ... Thermal modeling of a ...
Lubricants, Volume 4, Issue 3 (September 2016) . Issues are regarded as officially published after their release is announced to the table of contents alert mailing list.; You may sign up for e-mail alerts to receive table of contents of newly released issues.; PDF is the official format for papers published in both, html and pdf forms.
Cann P.M.: Grease degradation in a bearing simulation device. Tribology International 39 (2006) 1698–1706. 5. Krawiec S., Krawiec M., Leśniewski T.: Wpływ dodatków ...
The invention relates to a method of predicting when a grease in a grease-lubricated rolling element bearing ( 10 ) will reach an unacceptable condition. According to the invention, a time series of a parameter is measured and recorded, whereby the parameter is directly or indirectly indicative of a degree of breakdown of a lubricant film separating the rolling contacts.