Numerical analysis of effect of geometric parameters on hybrid pressure distribution in internal gear motor and pump

Abstract

The paper analyzes the effect of geometric parameters on proportion of hydrodynamic and hydrostatic pressure in the oil lubrication film of internal gear motor and pump. The Reynolds equation with appropriate boundary condition is solved to obtain 2D hydrodynamic pressure distribution by using the finite difference method (FDM). The resistance network model (RNM) is used to predict the hydrostatic pressure profile. Numerical calculations point out that the radial clearance has much effect on both static and dynamic pressure. The axial clearance has effect only on hydrostatic pressure profile. Meanwhile, the L/D ratio has slightly effect on pressure distribution.