Selection of hydraulic pump motor parameters

1. The selection principle of hydraulic pump motor
Index ①Do you need variables: If you need variables, please select radial piston pumps, axial piston pumps and single-acting vane pumps.
Index ②Working pressure: Generally, the pressure of the plunger pump is 31.5MPa, which is high pressure; the pressure of the vane pump is 6.3MPa, which can reach 16MPa after high pressure, which is medium pressure. The gear pump pressure is 2.5MPa, which is a low pressure, but the highest can reach 21MPa, reaching a medium-to-high level.
Indicator ③Working environment: resistance to pollution sources. Gear pumps have the best anti-pollution ability, followed by vane pumps, and finally plunger pumps.

Index ④Noise: Low noise is mainly internal gear pump, double-acting vane pump and screw pump. The instantaneous flow of the double-acting vane pump and the screw pump is uniform without too much pulsation.
Index ⑤ Efficiency: The total efficiency of the axial piston pump is the highest, followed by the vane pump, and finally the gear pump; the pump with the same structure, the pump with the larger displacement has higher total efficiency. Pumps of the same displacement have the highest total efficiency under rated conditions.
2. Selection of hydraulic pump motor size
After determining the type of hydraulic pump motor, we need to calculate the parameters.
The selection of the hydraulic pump motor is usually based on the performance requirements of the hydraulic pump to select the type of the hydraulic pump, and then determine its specific specifications according to the pressure and flow that the hydraulic pump should guarantee.
The characteristics of various hydraulic pump motors
Gear pump
External gear pump: insensitive to oil, simple structure, low cost, large pulsation, large noise
Internal gear pump: insensitive to oil, simple structure, high cost, low pulsation, low noise
Vane pump
Double action: sensitive to oil, compact structure, unchanged, free from radial imbalance force, low noise
Single acting: variable variable, low pressure, bearing radial unbalanced force, high noise
Plunger pump: high pressure, variable, sensitive to oil, loud noise