How do fluid couplings work

It is also known as pump because it acts as a centrifugal pump. Turbine: It is connected to the output shaft to which the rotational power is to be transmitted. Impeller: The impeller is connected to the prime mover internal combustion engine which is a power source.

The turbine is connected to the output shaft where rotation power is needed to be transmitted. The impeller and turbine is enclosed in an oil-tight sealed housing. The housing consists of transmission fluid. On the same principle the fluid coupling works.

In which the impeller acts as first fan and the turbine act as second fan. Both impeller and turbine are enclosed in an oil tight housing. The impeller is connected to the input shaft of the prime mover and the turbine with the output shaft.

When the impeller is rotated by the prime mover, the fluid in housing experiences centrifugal force and due to curved vanes of the impeller the fluid is directed towards the turbine blades.

As the fluid strikes the turbine blades it starts imparts energy and causes it to rotate. With the increase in the speed of impeller, the velocity of the turbine increases and becomes approximately equal to the impeller speed. The fluid after passing through the turbine blades again return back to the impeller. This continues and the impeller and the turbine attain the same speed and works as one single unit.

Thus power is transmitted from the prime mover to the driven unit without being physically fastened. December 15, Jagarnath Mahato. Essential Parts: The driving input section known as impeller which acting as a pump.

The driven output section known as runner or rotor which acting as a turbine. The casing which bolts to the impeller enclosing the runner providing an oil tight reservoir. Fluid Coupling Working Principle As the electric motor accelerates to the running speed, the impeller begins to centrifugally pump oil to the stationary runner.

Power transmission is smooth even in extreme condition. Motor or engine starts unloaded. Overload protection. Controlled start up speed without shock loading of power transmission system. The maximum torque can be adjusted by varying the amount of oil filled in the casing. Fluid coupling can be used in both vertical and horizontal application.

Disadvantage There is always slip. There is always slight difference in speed of impeller and runner. It is used as an alternative for the mechanical clutch.

In practice there are two types of fluid couplings; Constant Filling, where the oil filling is fixed and variable filling also known as variable speed where the quantity of oil in the working circuit can be varied whilst running to give control over the amount of slip between the impeller and runner and so give speed regulation.

The variable filling fluid coupling also gives a means of declutching a machine from its drive and are used extensively in conveyor drives to control accurately the torque applied during acceleration and give easy load balancing using external controls.

In technical collaboration with Transfluid S. A, Italy and manufactured with Pressurised Aluminium die-casting to ensure no porosity over a period of time to avoid oil seepage, best aesthetics, superior quality. Also, our fluid couplings are fitted with proven quality Lovejoy flexible couplings for long-lasting. There are many types of coupling available in the market having its own importance in different parts of the transmission.