Hydraulic motors


A hydraulic motor is an actuator of a hydraulic system that converts the liquid pressure energy provided by a hydraulic pump into the mechanical energy (torque and speed) of its output shaft. It is an important device to realize the conversion of hydraulic energy into mechanical energy, which is mainly composed of motor shell, rotor, gear, rack, oil circuit, etc.


Hydraulic motors have a wide range of applications, mainly used in injection molding machinery, ships, hoists, construction machinery, construction machinery, coal mining machinery, mining machinery, metallurgical machinery, petrochemical, port machinery and other fields. In these fields, hydraulic motors can drive the actions of various equipment, such as lifting, rotating, walking, etc., to meet the requirements of various complex working conditions.


In addition, hydraulic motors are also widely used in the field of automated production lines, such as injection molding machines, paper machines, extruders, etc., as well as in the field of concrete engineering, such as pump trucks, mixer trucks, etc. In the aerospace sector, hydraulic motors also play an important role, such as for aircraft landing gear, flight simulators, etc.


The main components of a hydraulic motor include motor housing, rotor, gear, rack, oil circuit, etc. In addition, the specific structure may also include the following parts:

1. Shell: Usually made of cast iron or aluminum alloy, which is used to support and protect internal parts.

2. Rotor: also known as the rotor assembly, it is the core part of the hydraulic motor, which is usually composed of an oscillating wheel, a flow grid and a groove on the shaft. The rotor is equipped with gears or blades, which are the key components for the conversion of hydraulic energy into mechanical energy.

3. Plunger assembly: It is composed of multiple plungers and plunger seats, which reciprocate under the action of hydraulic pressure and convert hydraulic energy into mechanical energy.

4. Motor shaft: The part that converts the motion of the plunger into rotational motion, usually made of steel.

5. Bearing: used to support the rotating parts in the hydraulic motor to ensure that they rotate normally without excessive friction.

6. Interface board: Usually used to connect hydraulic motors and other hydraulic system components, such as hydraulic pumps and valves.

7. Oil port and oil drain port: used for incoming and outgoing hydraulic oil, lubricating and cooling parts of the hydraulic motor.

8. Guide: used to control the direction and position of the plunger to ensure the normal operation of the motor.

9. Seals: used to strengthen the sealing performance of the hydraulic motor, reduce the leakage of the hydraulic system, and ensure the lubrication of the internal parts of the motor.


In addition, depending on the type of hydraulic motor and the application scenario, it may also contain other specific components, such as reducers, end caps, pressure reducing valves, etc. The end cover is divided into hydraulic and transmission end cover, the hydraulic end cover is encapsulated with various valves, and the transmission end cover is encapsulated with oil circuit and various transmission shafts. The pressure reducing valve is the main control element of the motor, which is used to control the output pressure of the hydraulic system.


When designing and using a hydraulic motor, a variety of factors need to be considered, such as working pressure, flow rate, working environment, etc., to ensure its proper operation and long service life. At the same time, regular maintenance and maintenance are also the key to ensure the long-term stable operation of the hydraulic motor.


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