clutches and brakes Flashcards
what is the purpose of clutches in power transmission systems ?
to engage or disengage a driven machine with out stopping the prime mover
square jaw clutch can only be engaged at very ?
low speeds , but can be disengaged at any speed as long as its not transmitting torque
name 3 types of positive clutches
square jaw
spiral jaw
multiple tooth design
true or false
friction clutches can connect or disconnect the power source at any speed?
true
postive contact clutches do not allow ?
slippage , cannot be engaged at high speeds due to shock loads
true or false
friction clutches depend on on the coefficient of friction between clutch surfaces and a pressure plate
true
when a clutch is flooded with oil they are considered to be?
wet clutch- have a much longer service life due to the cooling effect
non metallic friction linnings may use ?
asbestos or an asbestos replacement as filler
metalic friction material may be solid plates of disks made of?
steel or bronze or may consist of sintered bronze material bonded to steel backing
radial clutches has the contact pressure applied against ?
a rim or drum
expanding shoe and contracting shoe
what does rapid wear on a clutch indicate
undersized clutch
axial clutches have contact pressure applied to the face using a?
friction disc and pressure plate
single disk
multi disk and cone
the friction disc functions as the main wearing surface which allows for replacement with out ?
changing the entire unit
name 3 types of axial friction clutches
single friction clutch
multiple disc friction clutch
cone clutch
on a single friction clutch what is used to press on the fingers of the pressure plate to disengage the clutch ?
a release bearing or sleeve
