Abstract
In this paper, Finite Difference Method (FDM) is used to calculate the pressure distribution in lubricated oil film inside the internal gear motor and pump. The effects of geometric and working parameters on the pressure distribution is then analysed. The simulation results point out that the pressure distribution as well the maximal pressure in film thickness greatly depends on the position of oil supporting nuts. Based on the analysis of the pressure distribution, a new concept for oil supporting system for the internal gear motor/pump is proposed. The simulation results point out that the new concept of oil supporting system allows the IGMaP to avoid the negative effect of nut position on pressure distribution even when the internal gear motor and pump operates in 4 quadrants.
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