The hydraulic coupler is one of the important components of the conveyor, which can ensure the efficient completion of the work of the conveyor. Hydraulic coupling is a non-rigid coupling with a liquid working medium, which is used to transfer rotating mechanical energy between shafts or drive shafts.

What do you know about the role of hydraulic coupler in the conveyor? The following will show you what hydraulic coupler is and its characteristics.

What are fluid couplings parts?

The hydraulic coupling, also known as hydraulic coupling, connects the engine or motor with the working machine, and transfers the rotating power from one shaft to another by the liquid momentum.

The hydraulic coupler is mainly composed of casing, turbine , and hydraulic oil. There is a seal around the shell. It is mainly used to protect the impeller and turbine. The turbine outputs the shaft by rotating the power link. Hydraulic oil is the turbine used to connect the transmission shaft.

Working principle of hydraulic coupler

The working principle of fluid can be simply explained by two fans, one connected to the power supply and the other not. When the power switch is turned on, the air from the first fan begins to blow to the second fan (not connected to the power supply). Initially, when the first fan blows at a lower speed, it cannot drive the second fan. However, as the speed of the power fan increases, the air speed impacting the second fan blade will also increase and start to rotate. Some time, it obtains the same speed as the first fan.

There are many structural forms of hydraulic couplers. Different hydraulic couplers are slightly different in structure and principle, but their basic principles are the same. They all convert the mechanical energy into the kinetic energy of the liquid through the pump wheel and then impact the turbine with the flowing liquid to realize the conversion of the kinetic energy of the liquid to the mechanical energy, and output power outward.

What are the advantages and disadvantages of hydraulic coupler?

The followings are the advantages and disadvantages of the hydraulic coupler.


  • l No wear power transmission: there is no mechanical connection between the driving shaft and the power shaft.
  • l Motor no-load start
  • l The output speed is lower than the input speed, and the speed difference between the two shafts increases with the increase of load
  • l It has strong adaptability to the environment and can work in cold, wet, dust and explosion-proof environments
  • l High performance-price ratio, low price, low initial investment and short payback period
  • l Simple structure, simple operation , and maintenance, no special complex technology, low maintenance cost
  • l With clutch function, speed-regulating type and clutch type hydraulic coupler can start or brake the working machine without stopping the rotation of the motor


  • l There is always an error in the matching of a hydraulic coupler and centrifugal machinery
  • l The output speed is always lower than the input speed, and the output speed will change
  • l It covers a large area and needs to occupy a certain space between the power machine and the working machine
  • l The variable speed hydraulic coupler needs a cooling system, which increases the investment and operation costs

Application of hydraulic coupler

Aviation applications;

Automobile: hydraulic coupler is used in semi-automatic transmission and automatic transmission. The coupler is a part of the flywheel and is called the hydraulic flywheel. The turbine is connected to the input shaft of the transmission. The liquid circulates between the pump wheel and the turbine, making the torque transfer from the engine to the transmission, driving the vehicle forward. In this respect, the function of a hydraulic coupler is very similar to that of a mechanical clutch in manual transmission;

Heavy industry: used for metallurgical equipment, mining machinery, chemical industry, etc;

The hydraulic coupler can help the conveyor work better and longer, and colleagues can save energy when moving products.

For more information on conveyors, please contact NAR.

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