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A liquid coupling used to transmit turning effort from the engine to the clutch is called as Fluid coupling or fluid drive or fluid flywheel. It is located between the crankshaft and the clutch and Fluid coupling is always a major part of the engine flywheel assembly.

Construction and working of fluid coupling

Construction and working of fluid coupling as follows:
An automotive fluid coupling consists of a split housing which is rotate by the engine crankshaft. Inside the housing is a driven member is called runner and the driven member is connected by a shaft to the gear box. The driving member is mounted on the crankshaft and it is called impeller.

The driving (input) and driven (output) members are very close with their ends facing each other and enclosed in housing, so that they can be turned without touching each other. The liquid or oil is filled in the housing. The fly wheel housing is divided into a number of cells by means of radial vanes. These cells correspond to similar openings in the driven member.

When the crankshaft turns, the driving member or impeller also rotates. The fluid flows outwards due to the centrifugal force and circulates from the flywheel to the driven member. Now, the fluid tends to rotate the driven member because the fluid is also carried out round by the driving member. The fluid is also carried out round by the driving member. The fluid is also carried out round by the driven member so; the fluid tends to rotate the driven member. Thus the torque is transmitted from the crankshaft to the gear box shaft.
The liquid coupling is not suited for use with an ordinary gear box. It is generally used in conjunction with epicyclical gears to provide a semi or fully automatic gear box.





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