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Ningbo Power Hydraulic Motor Co.,Ltd
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Add:No.588 Danshuihong Road, Cixi City, Ningbo, China

Performance Parameters Of Hydraulic Pump

The hydraulic pump is the power element of the hydraulic system. Its function is to supply the hydraulic oil to the hydraulic system. From the point of view of energy change, it will be the pressure energy of the mechanical energy of the prime mover (such as the engine). The hydraulic motor is assigned to the fulfillment element, which can change the pressure of the input liquid to the mechanical energy of the output shaft roll, which is used to drag the load. According to the construction method, hydraulic pump and hydraulic motor can be divided into gear type, blade type, plunger type and so on.

1. Hydraulic pump pressure

Hydraulic pump working pressure refers to the pump (or motor) in the practice of work output (or input) the pressure of the oil, the choice by the external load.

The rated pressure is the maximum pressure that can be continuously operated according to the test standard under normal operating conditions. Its size is limited by the number of longevity, if the pressure exceeds the rated work, the pump (or motor) life expectancy will be shorter than the design of the number of life. When the working pressure is greater than the rated pressure, said overload.


The working speed is the speed at which the pump (or motor) is running at work.

Rated speed refers to the rated pressure, can continue for a long time to work the maximum speed. If the pump exceeds the rated speed work will be the formation of lack of oil absorption, the occurrence of oscillation and large noise, parts will suffer cavitation damage, the number of life reduction.

The minimum safe speed is the minimum speed at which the motor is normally operated. At this speed, the motor does not show a crawling scene.

3. Displacement and flow

Displacement is the volume of the discharge (or input) liquid that is changed by the geometric standard of the sealed cavity at each turn of the pump (or motor) for one week. The common unit is ml / r (ml / rev). Displacement can be changed by scheduling the variable pump (or variable motor), the displacement can not be changed to become a quantitative pump (or quantitative motor).

Internship flow refers to the flow of the pump (or motor) at the exit (or inlet) at work. Due to the existence of the pump itself leak, in fact, the flow is less than the theoretical flow. As the motor itself also exists within the leak, to achieve the specified speed, in order to compensate for the amount of leakage, the input flow is necessary to greater than the theoretical flow.

4. power

Volume power, the hydraulic pump is the ratio of the actual flow and theoretical flow. The hydraulic motor is the ratio of the theoretical flow to the internship flow.

Mechanical power, the hydraulic pump is the theoretical torque and the actual input torque ratio. The torque applied to the hydraulic motor is the torque of the theoretical torque over the friction force, and its mechanical power is the ratio of the actual output torque to the theoretical torque.

The total power is the ratio of the output power of the pump (or motor) to the input power. The total power is equal to the product of the volumetric power and the mechanical power.