Construction and Working Of Fluid Coupling
Introduction To Fluid Coupling:
Parts Of Fluid Coupling:
A fluid coupling consists of three components, plus the hydraulic fluid:
- The housing, also known as the shell (which must have an oil-tight seal around the drive shafts), contains the fluid and turbines.
Two turbines (fan like components):
- One connected to the input shaft; known as the pump or impeller, primary wheel input turbine
- The other connected to the output shaft, known as the turbine, output turbine, secondary wheel or runner
|Construction and Working Of Fluid Coupling|
- If there is a difference between input and output angular velocities the motion has a component which is circular (i.e. round the rings formed by sections of the torus).
- If the input and output stages have identical angular velocities there is no net centripetal force – and the motion of the fluid is circular and co-axial with the axis of rotation (i.e. round the edges of a torus), there is no flow of fluid from one turbine to the other.
- Used For industrial application where heavy starting torque or ineria is needed under constant cyclic Loading.
- Automobile: Mainly used in automobile sector in semi Automatic or Fully Automatic Transmission system:-In automotive applications, the pump typically is connected to the flywheel of the engine—in fact, the coupling’s enclosure may be part of the flywheel proper, and thus is turned by the engine’s crankshaft. The turbine is connected to the input shaft of the transmission. While the transmission is in gear, as engine speed increases torque is transferred from the engine to the input shaft by the motion of the fluid, propelling the vehicle. In this regard, the behavior of the fluid coupling strongly resembles that of a mechanical clutch driving a manual transmission.
- Aeronautical applications