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

Fluid couplings are hydrodynamic devices that transmit rotation between shafts by acceleration and deceleration of hydraulic fluid. Shafts are used industrially to provide rotary motion to a wide spectral range of vehicles and tools and shaft couplings are fundamental to providing protected rigid, flexible or non-linear connection between shafts, wheels and rotary equipment.

Fluid couplings contain a housing containing an impeller on the input or driving shaft and a runner about the result shaft. Both these contain a fluid which is generally oil that is added to the coupling through a filling plug on the housing. The impeller, which functions as a pump, and the runner, which works as a turbine, are both bladed rotors. The parts of fluid couplings are generally made out of metallic materials-aluminum, steel or stainless steel. Fluid couplings are used in the motor vehicle, railroad, aerospace, marine and mining sectors. They are used in the transmissions of automobiles as an alternative to mechanical clutches. Forklifts, cranes, pumps of most types, mining machinery, diesel trains, aircrafts and rotationally-powered industrial machinery all use fluid coupling when an application requires variable speed procedure and a startup without shock loading the system. Manufacturers make use of these couplings for connecting rotary products 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 have many radial vanes. They encounter each other but unlike gear couplings haven’t any mechanical interconnection and never touch. Fluid can be directed by the pump in to the impeller. The traveling turbine or pump is certainly rotated by an internal combustion engine or electric engine imparting both linear and rotational motion to the fluid. The velocity and energy is usually transferred to the liquid when the impeller rotates. It really is then changed into mechanical energy in the rotor. Every liquid coupling has differing stall speeds, which is the highest velocity that the pump can change when the runner can be locked and maximum insight power is used. Slipping always occurs since the input and result angular velocities are similar, and therefore the coupling cannot reach full power efficiency-some of it’ll always be lost in the fluid friction and turbulence. Versatile shaft couplings such as fluid couplings are necessary because during procedure, some types of shafts tend to shift, causing misalignment. Versatile couplings provide efficient accommodation for moderate shaft misalignment that occurs when the shafts’ axes of rotation become skewed. Shaft movement is due to bumps or vibration and it results in parallel, angular or skewed shaft misalignment.
Quick release coupling (quick connect-disconnect coupling), is certainly a mechanical device,that delivers a fast, practical way to repeatedly connect and disconnect any liquid line.