Fluid Coupling

 A fluid coupling or hydraulic coupling is a
hydrodynamic device used to transmit rotating
mechanical power

 The fluid coupling originates from the work of
Dr. Hermann Föttinger, who was the chief
designer at the AG Vulcan Works in Stettin.
 Hermann Föttinger (born 9 February 1877 in
Nuremberg; died 28 April 1945 in Berlin) was a
German engineer and inventor

 Fluid couplings are used in many industrial
application involving rotational power,[9][10]
especially in machine drives that involve high-
inertia starts or constant cyclic loading

 It has been used in automobile transmissions as
an alternative to a mechanical clutch

 A fluid coupling consists of three components,
plus the hydraulic fluid
 The housing, also known as the shell[5] (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 impellor,[5] primary wheel[5] input turbine
 The other connected to the output shaft, known as
the turbine, output turbine, secondary wheel[5] or
runner

Advantages
 Makes it easy the gently
accelerate the driven
machines
 Limites torque, provied
load sharing, dampen
torque vibrations
 During start up will
reduce current draw on
your electric moter by
33%
Disadvantages
 Under stall conditions
all of the engines power
would be dissipated in
the fluid coupling as
heat leading to damage
 Fluid coupling cannot
develop output torque
when the input and
output angular
velocities are indentical

 Fluid couplings are relatively simple
components to produce. For example, the
turbines can be aluminum castings or steel
stampings, and the housing can also be a
casting or made from stamped or forged steel.

Fluid Coupling

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