A hydraulic coupling is a device that uses hydraulic power to connect two axes and transmit torque. It usually consists of an inner and outer sleeve, a spring, a sealing ring and a liquid.

The working principle of the hydraulic coupling is that when the two shafts rotate, the inner and outer sleeves drive the liquid to rotate together. The fluid enters the inlet of the hydraulic coupling and forms a layer of hydraulic pressure in the casing. This hydraulic pressure connects the inner and outer sleeves together so that they achieve the effect of coupling. 

At the same time, hydraulic couplings provide additional connection and sealing by means of springs and sealing rings. The spring makes the coupling have a certain elasticity, which can absorb and relieve the shock and vibration between the shafts. The sealing ring prevents liquid leakage and ensures stable operation of the hydraulic coupling.

Hydraulic couplings are characterized by compact structure, light weight, small moment of inertia, easy to assemble, safe and reliable, and can be flexibly combined with a variety of other transmission components. Hydraulic couplings are suitable for applications requiring high torque transmission and smooth transmission, such as Marine engineering machinery, heavy equipment and other fields.

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