CLUTCHES PPT Flashcards
is a machine member used to connect a driving shaft to a driven shaft so that the driven shaft may be started or stopped at will, without stopping the driving shaft.
Clutch
The use of a clutch is mostly found in __________.
automobiles
____________s are used when a positive drive is required.
Positive Clutch
The simplest type of a positive clutch is a
jaw or claw clutch
The use of __________ are frequently applied to sprocket
wheels, gears and pulleys.
jaw clutches
A __________ type is used where engagement and
disengagement in motion and under load is not necessary.
This type of clutch will transmit power in either direction of
rotation.
square jaw
The _________ may be left-hand or right-hand, because
power transmitted by them is in one direction only. This
type of clutch is occasionally used where the clutch must be
engaged and disengaged while in motion.
spiral jaws
has its principal application in the transmission of power of shafts and machines which must be started and stopped frequently.
Its application is also found in cases in which power is to be
delivered to machines partially or fully loaded.
The force of friction is used to start the driven shaft from
rest and gradually brings it up to the proper speed without
excessive slipping of the friction surfaces.
Friction Clutch
A _____________ may be used when a large torque is to be transmitted.
Multiple Disc Clutch
The __________ (usually of steel) are fastened to the driven
shaft to permit axial motion (except for the last disc).
inside discs
The ___________ (usually of bronze) are held by bolts and
fastened to the housing which is keyed to the driving shaft.
outside discs
It consists of one pair of friction surface only.
The driver is keyed to the driving shaft by a sunk key and has an inside conical surface or face which exactly fits into the outside conical surface of the driven.
The driven member resting on the feather key in the driven shaft, may be shifted along the shaft by a forked lever (shifting fork) provided at groove B, in order to engage or disengage the clutch.
The compression spring placed around the driven shaft provides the force to engage the clutch.
The contact surfaces of the clutch may be metal to metal contact, but more often the driven member is lined with some material like wood, leather, cork or asbestos, etc.
Cone Clutch
The _____________ is usually incorporated into the motor pulley.
It consists of a number of shoes on the inside of a rim of the pulley.
centrifugal clutch
