Classification of hydraulic pumps

Classification of hydraulic pumps

According to the structure, it is divided into three categories: plunger pump, gear pump and vane pump.

According to whether the displacement is adjustable: quantitative pump, variable pump.

According to the direction of oil discharge: one-way pump, two-way pump.

According to the pressure level: low pressure, medium pressure, medium high pressure, ultra-high pressure 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.

Gear pumps are widely used in mining equipment, metallurgical equipment, construction machinery, construction machinery, agricultural and forestry machinery and other industries.

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. High-pressure vane pumps are used in the hydraulic systems of lifting and transport vehicles and construction machinery.

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. Plunger pumps are often used in cycling diesel engines to deliver high-pressure fuel.

Classification of hydraulic motors

According to the structure, it is divided into several main forms: gear type, vane type and plunger type.

According to the speed and torque range: high-speed motor and low-speed motor.

The gear type hydraulic motor is simple in structure and cheap in price, and is often used in occasions where high speed, low torque and low requirements for motion stability are not required. Such as driving grinders, fans, etc.

The vane hydraulic motor has small rotational inertia, sensitive action, low volumetric efficiency, and soft mechanical characteristics.

The axial piston motor has high volumetric efficiency, large adjustment range, and good low-speed stability.