Abstract
The lubrication modes of line contacts between vane and camring in oil hydraulic vane pumps with and without intravanes have been investigated. First, the variations of the radial acting force of a vane were calculated on the basis of the results measured for the dynamic internal pressure in the four chambers surrounding a vane in addition to the results in the previous paper(4). Next, distinctions of the lubrication modes were made with Hooke's chart which represents an improve-ment over Johnson's. Finally, the influence of the boundary conditions in the lubrication region on the fluid film lubrication was examined by calculating the film pressure distributions. The results show that the high-frequency pressure ripple acts as the force causing separation of vanes from the camring, that the lubrication mode of the vane tip is the rigid-variable-viscosity region, and that discharge pressure higher than 7 MPa exerts a great influence on the oil film pressure in the large arc section because of the Piezo-viscous effect.
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