Your agricultural
parts connection

Fluid coupling

A liquid coupling or hydraulic coupling is a hydrodynamic or ‘hydrokinetic’ device utilized to transmit rotating mechanical power. It’s been used in automobile transmissions as an alternative to a mechanical clutch.

Fluid couplings are hydrodynamic gadgets that transmit rotation between shafts by acceleration and deceleration of hydraulic fluid. Shafts are utilized industrially to supply rotary motion to a wide spectrum of vehicles and products and shaft couplings are key to providing secure rigid, flexible or non-linear connection between shafts, wheels and rotary equipment.

Fluid couplings consist of a housing containing an impeller in the input or driving shaft and a runner in the output shaft. Both of these contain a fluid which is usually oil that is put into the coupling through a filling plug on the housing. The impeller, which works as a pump, and the runner, which functions as a turbine, are both bladed rotors. The parts of fluid couplings are generally crafted from metallic materials-aluminum, steel or stainless steel. Fluid couplings are found in the motor vehicle, railroad, aerospace, marine and mining industries. They are used in the transmissions of automobiles as an alternative to mechanical clutches. Forklifts, cranes, pumps of most kinds, mining machinery, diesel trains, aircrafts and rotationally-powered commercial machinery all use fluid coupling when an application requires variable speed operation and a startup without shock loading the system. Manufacturers utilize these couplings to connect rotary devices such as drive shafts, collection shafts, generators, wheels, pumps and turbines in a number of automotive, coal and oil, aerospace, water and waste treatment and construction industries.

In a fluid coupling, the impeller and rotor are both bowl-shaped and have many radial vanes. They encounter one another but unlike gear couplings haven’t any mechanical interconnection rather than touch. Fluid is usually directed by the pump in to the impeller. The generating turbine or pump is usually rotated by an internal combustion engine or electrical motor imparting both linear and rotational movement to the liquid. The velocity and energy is transferred to the fluid when the impeller rotates. It is then converted into mechanical energy in the rotor. Every fluid coupling has differing stall speeds, which is the highest swiftness that the pump can turn when the runner is certainly locked and maximum input power is used. Slipping always occurs because the input and result angular velocities are identical, and therefore the coupling cannot reach full power efficiency-some of it will always be lost in the liquid friction and turbulence. Versatile shaft couplings such as fluid couplings are necessary because during operation, some types of shafts have a tendency to shift, causing misalignment. Versatile couplings provide efficient lodging for moderate shaft misalignment that occurs when the shafts’ axes of rotation become skewed. Shaft movement is caused by bumps or vibration and it results in parallel, angular or skewed shaft misalignment.
Quick release coupling (quick connect-disconnect coupling), is usually a mechanical device,that delivers a fast, practical way to repeatedly connect and disconnect any liquid line.


Get In Touch

Interested in our products? Need some technical support? Just have a few questions? Feel free to contact us.


    The use of original equipment manufacturer’s (OEM) part numbers or trademarks , e.g. CASE® and John Deere® are for reference purposes only and for indicating product use and compatibility. Our company and the listed replacement parts contained herein are not sponsored, approved, or manufactured by the OEM.