The problems caused by the high pressure of the gear pump to increase the working pressure are:
　　 (1) Bearing life is greatly shortened, shortening the life of the pump:
　　 (2) Pump leakage is intensified and volumetric efficiency is reduced. The root cause of these two problems is that the unbalanced radial hydraulic pressure acts on the gear, and the higher the working pressure, the greater the radial hydraulic pressure.
A few days ago, domestic and foreign scholars conducted research on the above two issues:
　　 (1) Compensation for the radial gap of the gear pump ;
　　 (2) Improve the bearing capacity of the bearing, such as the use of composite sliding bearings instead of needle bearings; the use of dynamic pressure sliding bearings.
　　 (3) reduce the radial hydraulic pressure of the gear pump, such as optimizing the gear parameters, reducing the size of the liquid discharge port, using a balanced composite gear pump;
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