Coefficient of friction in mixed film lubrication: Gears versus twin-discs

2007 ◽  
Vol 221 (3) ◽  
pp. 399-411 ◽  
Author(s):  
J Castro ◽  
J Seabra
Keyword(s):  
Coefficient Of Friction ◽  
Mixed Film ◽  
Film Lubrication

First Paper: Effect of Under-Lip Temperature on the Lubrication of Rotary Shaft Garter Spring Seals

1966 ◽  
Vol 181 (1) ◽  
pp. 185-190 ◽  
Author(s):  
D. J. Lines ◽  
J. M. Lawrie ◽  
J. P. O'Donoghue
Keyword(s):  
Coefficient Of Friction ◽  
Operating Temperature ◽  
Lubrication Theory ◽  
Fluid Film ◽  
Hydrodynamic Parameter ◽  
Accurate Knowledge ◽  
The Coefficient Of Friction ◽  
Surface Thermocouple ◽  
Sealing Mechanism ◽  
Film Lubrication

Although rotary shaft garter spring seals are widely used throughout industry, very little is known about the sealing mechanism of the lip-shaft interface. It is now generally accepted that some sort of fluid film separates the lip and the shaft. Previous workers have also postulated a relationship between the coefficient of friction and a non-dimensional hydrodynamic parameter, as in standard lubrication theory. This present paper clarifies this relationship, and shows that seals can also operate over the mixed friction, as well as the full film lubrication region. The results were obtained by accurate knowledge of the operating temperature under the sealing lip. Two types of surface thermocouple were developed to do this and these are described in full.

Porous Retainers for Rolling Bearings

1981 ◽  
Vol 23 (6) ◽  
pp. 263-271
Author(s):  
R. Gohar ◽  
H. So
Keyword(s):  
Ball Bearing ◽  
Porous Matrix ◽  
Critical Value ◽  
Eccentricity Ratio ◽  
Rolling Bearings ◽  
High Coefficient ◽  
Lubrication Regime ◽  
Permeability Parameter ◽  
Mixed Film ◽  
Film Lubrication

A theoretical analysis is made for the lubrication of ball bearing retainers made of porous material. The results show that at low Sommerfeld reciprocals, the eccentricity ratio tends to unity with a high coefficient of friction. At a certain critical value of the reciprocal, a minimum friction occurs, thereafter followed by hydrodynamic operation. The critical value depends on the permeability parameter of the porous matrix and increases with its porosity. Experiments suggest that at low Sommerfeld reciprocals or with the oil supply coming only from the retainer pores, mixed film lubrication occurs, friction being less than that obtained theoretically. Such a lubrication regime would still allow sufficient oil to be carried by the balls to the races for their lubrication.

A thermal analysis of strip-rolling in mixed-film lubrication with O/W emulsions

2006 ◽  
Vol 39 (12) ◽  
pp. 1591-1600 ◽  
Author(s):  
A.K. Tieu ◽  
P.B. Kosasih ◽  
A. Godbole
Keyword(s):  
Thermal Analysis ◽  
Strip Rolling ◽  
Mixed Film ◽  
Film Lubrication

A novel model for a mixed-film lubrication with oil-in-water emulsions

2013 ◽  
Vol 66 ◽  
pp. 241-248 ◽  
Author(s):  
Rong-Tsong Lee ◽  
Kun-Ta Yang ◽  
Yuang-Cherng Chiou
Keyword(s):  
Oil In Water ◽  
Mixed Film ◽  
Novel Model ◽  
Film Lubrication
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