Abstract
The static characteristic of oil filled porous journal bearings with anisotropic permeability are theoretically investigated. Considering anisotropic permeability, the Reynolds equation for the oil film is modified to include the effect of tangential velocity slip at the interface between the oil film and the porous medium, and the pressure equation for the porous medium is obtained from Darcy's law and the continuity equation. These equations are applied to the system and are numerically solved. This paper analyzes the porous bearings with anisotropic permeability for the case that permeability in one direction is lower than that in the other two directions. It is found that the static characteristics of porous bearings with anisotropic permeability are better than those with isotropic and homogeneous permeability from the following results. (1) Load capacity increases and total side leakage flow decreases. (2) Coefficient of friction decreases in the case of lower permeability in an axial or a radial direction.
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