Abstract:
An account
of numerical solutions to the isothermal and flooded elastohydrodynamic lubrication (Fhl) of a logarithmic profile
roller, which is rolling over a flat plane, is given. The
analysis takes account of sideways flow of lubricant in the
inlet region of the contact. When the results are presented in
suitable non-dimensional groups, it is shown that more uniformly
pressure and shape of the film distribution in axial direction
is taken place under light loading. As the increase of the load,
the end closure is displayed and the oil pressure rises sharply
at the ends. The seal action formed by the end closure makes the
film thickness a little. And the minimum film thickness is
transferred from the central to the ends and the value is
reduced rapidly. As the increase of the speed, the end closure
becomes much serious. The optimum crowing value obtained in EHL
state is larger than the design value obtained in elastostatic
contact state for the same working conditions. In order to
verify the correctness of theory, optical interferometry is
applied to measure the oil film thickness between a logarithmic
profiled roller and a glass plate under pure rolling
conditions. It is found the agreement between numerical solutions
and experiments is very good.
Key words: Elastohydrodynamic lubrication (EHL) Logarithmic profile roller finite line contacts Optical interferometry measurement
*
This project
is supported by National Natural Science Foundation of China (No.59475037).
Manuscript received on May 16, 2000; revised manuscript May 28, 2001
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