Hydraulic Pump

hydraulic pump

The hydraulic pump is the power component of the hydraulic system. It is driven by an engine or an electric motor, sucks oil from the hydraulic oil tank, forms the pressure oil and discharges it, and sends it to the actuator. Hydraulic pumps are divided into gear pumps, plunger pumps, vane pumps and screw pumps according to their structure.


A hydraulic pump is a hydraulic component that provides pressurized liquid for hydraulic transmission, and is a type of pump. Its function is to convert the mechanical energy of power machines (such as electric motors and internal combustion engines) into liquid pressure energy. There are many factors affecting the service life of the hydraulic pump, in addition to the design and manufacturing factors of the pump itself, the selection of some components related to the use of the pump (such as couplings, oil filters, etc.), and the operation during the commissioning process are also related.

The working principle of the hydraulic pump is that the movement brings about a change in the volume of the pump cavity, thereby compressing the fluid so that the fluid has pressure energy.

The necessary condition is that there is a change in the sealing volume of the pump cavity.

Common types of hydraulic pumps:

According to whether the flow can be adjusted, it can be divided into: variable pump and quantitative pump. The output flow can be adjusted according to the needs called variable pump, the flow can not be adjusted called quantitative pump.

According to the pump structure commonly used in the hydraulic system, it is divided into four types: gear pump, vane pump, plunger pump and screw pump.

Gear pump: small in volume, simple in structure, less strict on oil cleanliness, and cheaper in price; but the pump shaft is subject to unbalanced force, serious wear, and large leakage.

Vane pump: divided into double-acting vane pump and single-acting vane pump. This kind of pump has uniform flow, stable operation, low noise, higher working pressure and volumetric efficiency than gear pump, and more complicated structure than gear pump.

Plunger pump: high volumetric efficiency, small leakage, can work under high pressure, mostly used in high-power hydraulic systems; but complex structure, high requirements for materials and processing accuracy, high price, and high requirements for oil cleanliness.

Screw pump: It has the characteristics of variable amount conveying, strong self-priming ability, reversible, and can convey liquid containing solid particles. The conveying liquid is stable, no pulsation, no stirring, small vibration and low noise. It can be mixed with multiple phases, and can transport many corrosive media. The external bearing structure adopts independent lubrication and can transport various non-lubricating media.


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