Because the pressure of the gear pump comes from the closed cavity between the gear and the casing, there must be end face clearance and radial clearance for the gear to rotate. To increase the output pressure of the gear pump, it is necessary to reduce the clearance. When the gear rotates at high speed, the friction will increase, and the gap will become larger after a period of time, and the pressure will increase.
Because the pressure of the gear pump comes from the closed cavity between the gear and the casing, there must be end face clearance and radial clearance for the gear to rotate. To increase the output pressure of the gear pump, it is necessary to reduce the clearance. When the gear rotates at high speed, the friction will increase, and the gap will become larger after a period of time, and the pressure will still not increase. Generally, axial and radial clearance compensation measures are used.
In addition, the pressure of the gear pump increases, the radial force on the gear increases, and the bearing capacity of the bearing will be tested.
Let's analyze the specific reasons for this situation.
1. The KCB gear oil pump is a positive displacement pump, and its outlet pressure is determined by the back pressure, that is, the pipeline resistance drop pressure. If the pressure of the pipe network is large, the outlet pressure of the KCB gear oil pump will be high.
2. Check again whether the diameter of the outlet pipe is the same as the size of the pump outlet
3. The problem may be in the oil circuit, such as blockage, the valve is not fully opened, or the oil-using part is blocked.
4. The KCB gear oil pump itself should also be checked, but not as the focus.