摘要：This article presents an approach for improving the water film’s carrying capacity in the gear-shaft/journal-bearing interface in water hydraulic internal gear pumps by applying micro shapes to the gear shaft’s surface. The micro shapes are in the shape of sinusoidal waves that can be determined by three design parameters in terms of the wave number, the wave amplitude, and the convex ratio. An elasto-hydrodynamic model, which involves the evaluations of the film height, the film pressure, and the bearing deformation, is proposed to analyze the performance of the micro shapes, and the model is validated by comparison with the results from other research groups. By observing the performance of the micro shapes, it is seen that the convex shape has a positive effect while the concave shape has a negative effect on the film’s carrying capacity, and the carrying capacity decreases as the wave number increases. Additionally, further discussions are performed with respect to the design parameters of the convex shape under different operating conditions, suggesting that the wave amplitude should be maintained 0.8–0.9 times the maximum deformation of the bearing and the convex ratio should be 1/3.
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