Ppt (fluid coupling)

Fluid coupling

1. Mr. KulwinderpalSingh
Brar
M.Tech
A. P.(Deptt. of Mechanical),
School of Engg. & Tech.
Bachelor of Technology (AE) 6
th
Semester
Automotive Transmission–MEA 407

2. Fluid coupling
A device for transmitting rotation between
shafts by means of the acceleration and
deceleration of a hydraulic fluid. Structurally, a
fluid coupling consists of an impeller on the
input or driving shaft and a runner on the
output or driven shaft. The two contain the
fluid (see illustration). Impeller and runner are
bladed rotors, the impeller acting as a pump
and the runner reacting as a turbine.

3. Basically, the impeller accelerates the fluid from
near its axis, at which the tangential component
of absolute velocity is low, to near its periphery,
at which the tangential component of absolute
velocity is high. This increase in velocity
represents an increase in kinetic energy. The fluid
mass emerges at high velocity from the impeller,
impinges on the runner blades, gives up its
energy, and leaves the runner at low velocity