A liquid coupling or hydraulic coupling is a hydrodynamic or ‘hydrokinetic’ device used to transmit rotating mechanical power. It has been found in automobile transmissions instead of a mechanical clutch.

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

Fluid couplings consist of a housing containing an impeller on the input or driving shaft and a runner about the result shaft. Both these include a fluid which is generally oil that is added to the coupling through a filling plug on the casing. The impeller, which acts as a pump, and the runner, which functions as a turbine, are both bladed rotors. The components of liquid couplings are generally made out of metallic materials-aluminum, steel or stainless. 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 all kinds, mining machinery, diesel trains, aircrafts and rotationally-powered commercial machinery all use liquid coupling when a credit card applicatoin requires variable speed operation and a startup without shock loading the machine. Manufacturers make use of these couplings to connect rotary equipment such as drive shafts, series shafts, generators, wheels, pumps and turbines in a variety 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 also have many radial vanes. They encounter each other but unlike gear couplings haven’t any mechanical interconnection rather than touch. Fluid can be directed by the pump in to the impeller. The driving turbine or pump is rotated by an interior combustion engine or electrical electric motor imparting both linear and rotational movement to the liquid. The velocity and energy is certainly transferred to the fluid when the impeller rotates. It is then changed into mechanical energy in the rotor. Every fluid coupling offers differing stall speeds, which is the highest acceleration that the pump can change when the runner is certainly locked and maximum insight power is applied. Slipping always occurs because the input and output angular velocities are similar, and then the coupling cannot reach complete power efficiency-some of it will always be dropped in the liquid friction and turbulence. Versatile shaft couplings such as for example fluid couplings are essential because during procedure, some types of shafts tend to shift, causing misalignment. Flexible couplings provide efficient lodging for moderate shaft misalignment occurring when the shafts’ axes of rotation become skewed. Shaft movement is caused by bumps or vibration and it outcomes in parallel, angular or skewed shaft misalignment.
Quick release coupling (quick connect-disconnect coupling), is a mechanical device,that delivers a fast, convenient way to repeatedly connect and disconnect any liquid line.