17-12-2012, 06:52 PM
CLUTCH
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Clutch Introduction
A Clutch is ia machine member used to connect the driving shaft to a driven
shaft, so that the driven shaft may be started or stopped at will, without stopping
the driving shaft. A clutch thus provides an interruptible connection between two
rotating shafts
Clutches allow a high inertia load to be stated with a small power.
A popularly known application of clutch is in automotive vehicles where it is used
to connect the engine and the gear box. Here the clutch enables to crank and
start the engine disengaging the transmission Disengage the transmission and
change the gear to alter the torque on the wheels. Clutches are also used
extensively in production machinery of all types
Mechanical Model
Two inertia’s I1and I2 and traveling at the respective angular velocities ω1
and ω2, and one of which may be zero, are to be brought to the same speed
by engaging. Slippage occurs because the two elements are running at different
speeds and energy is dissipated during actuation, resulting in temperature rise.
FRICTION CLUTCHES
As in brakes a wide range of clutches are in use wherein they vary in their are in
use their working principle as well the method of actuation and application of
normal forces. The discussion here will be limited to mechanical type friction
Machine Design II Prof. K.Gopinath & Prof. M.M.Mayuram
Indian Institute of Technology Madras
clutches or more specifically to the plate or disc clutches also known as axial
clutches
Frictional Contact axial or Disc Clutches
An axial clutch is one in which the mating frictional members are moved in a
direction parallel to the shaft. A typical clutch is illustrated in the figure below. It
consist of a driving disc connected to the drive shaft and a driven disc
co9nnected to the driven shaft. A friction plate is attached to one of the
members. Actuating spring keeps both the members in contact and
power/motion is transmitted from one member to the other. When the power of
motion is to be interrupted the driven disc is moved axially creating a gap
between the members as shown in the figure.