By D. Dowson
Elasto-Hydrodynamic Lubrication bargains with the mechanism of elasto-hydrodynamic lubrication, that's, the lubrication regime in operation over the small parts the place computer parts are in nominal aspect or line touch. The lubrication of inflexible contacts is mentioned, in addition to the consequences of excessive strain at the lubricant and bounding solids. The governing equations for the answer of elasto-hydrodynamic difficulties are presented.
Comprised of thirteen chapters, this quantity starts off with an summary of elasto-hydrodynamic lubrication and illustration of contacts by means of cylinders, through a dialogue on equations appropriate to lubrication, together with the Reynolds equation. The reader is then brought to lubrication of inflexible cylinders; the significance of movie thickness in hugely loaded inflexible contacts; the pliancy of solids in touch; and the speculation of elasto-hydrodynamic lubrication. next chapters concentrate on gear and measurements of movie thickness and movie form; friction and viscosity; and lubrication of gears and curler bearings.
This ebook may be of curiosity to tribologists.
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Extra resources for Elasto-Hydrodynamic Lubrication: International Series on Materials Science and Technology
Example text
In Purday's parabolic cylinder analysis the shear stresses within the cavitated zone were omitted. If the lubrication conditions are such that the shear forces in the cavitated part of the divergent clearance space make a maximum contribution to the total friction force compatible with the cavitation boundary condition discussed earlier, the sliding friction force component is increased by about 23 per cent. Dowson and Higginson (1963) have demonstrated that this difference can lead to significant changes in the predicted motion of rollers subjected to small torques in a roller bearing assembly.
These high pressures will influence both the lubricant and the solid bearing components. The two significant lubricant properties which will be affected by high pressures are density and viscosity. The density of liquid lubricants may increase by about 20 per cent at exceedingly high pressures. Changes of this order of magnitude cannot be expected to affect materially the separation of the bearing surfaces, and in any event the result will not be beneficial. The viscosity of lubricants is also pressure dependent, and under isothermal conditions a simple exponential relationship gives a reasonable approximation to the viscosity-pressure characteristics of a liquid.
IN HIGHLY LOADED RIGID CONTACTS 53 The influence of pressure on viscosity is thefirstfactor we have encountered which yields in increase in the predicted film thick ness. The increase of about 130 per cent calculated above is sub stantial, but it is still not sufficient to bring the predicted film thickness safely above the values of surface roughness in many contacts which are known to operate hydrodynamically. This brief examination does, however, show that a satisfactory ana lysis of highly loaded lubricated contacts must include the effect of high pressure on viscosity.
