DESCRIPTION The TRANSFLUID coupling (K series) is a
constant filling type comprising of three main elements: 1) Driving impeller
(pump) mounted on the input shaft. 2) Driven impeller (turbine) mounted on the
output shaft. 3) Cover, flanged to the output impeller, with an oil-tight seal.
The first two elements can work both as pump and/or turbine.
OPERATING CONDITIONS The TRANSFLUID coupling is a
hydrokinetic transmission. The impellers perform like a centrifugal pump and a
hydraulic turbine. With an input drive to the pump (e.g. electric motor or
Diesel engine) kinetic energy is imparted to the oil in the coupling. The oil
moves by centrifugal force across the blades of the turbine towards the outside
of the coupling. This absorbs the kynetic energy and develops a torque which is
always equal to input torque thus causing rotation of the output shaft. The
wear is practically zero since there are no mechanical connections. The
efficiency is influenced only by the speed difference (slip) between pump and
turbine. The slip is essential to the functioning of the coupling: there could
not be torque transmission without slip!
The formula for slip, from which the power loss can be deduced is as
follows: input speed - out speed slip %= _____________________ x
100 input speed
In normal
conditions (standard duty) the slip can vary from 1,5% (large power) to 6%
(small power).
The TRANSFLUID couplings follow the laws of all
centrifugal machines:
Transmitted
torque is proportional to the square of input speed;
Transmitted
power is proportional to the cube of input speed;
Transmitted
power is proportional to the fifth power of circuit outside
diameter.
