Breaks And Cluthes Flashcards
What do clutches do?
Smooth transmission of power
Protect machines or saftey feature
What are breaks used for?
Stop slow or hold a load
What are the methods of power transmission?
Friction types
Magnetic and electromagnetic
Mechanical lockup
What are the methods of actuation of power transmission?
Hydraulic
Pneumatic
Electromagnetic
Mechanical
Lines of flux is?
Putting current into a coil creating magnatisum
Friction types
Rotation in both directions
Heat generation / heat dissipation
Electromagnetic
- Magnetic particle - lines of flux attract particles to give power transmission
-Rotation in both directions - non friction
-Eddy current - DC voltage
-will not stop or hold
-small to light load
-rotation in either directions
-must be motion between two magnetic surfaces to work
Direct mechanical lock up
-oldest
-self actuation
TYPES
-wrap spring- one direction
-sprag - one direction
-Ramp and roller- one direction
- centrifugal- both directions / more speed =more torque transmission
^^^ no outside control needed
AKA backstopping / overrunning / one way
-square jaw
- positive engagement
-0-10 RPM
- no overload
- both directions
- spiral jaw
-0-150 rpm
-one direction
-positive engagement
-Multi tooth
- same as square jaw but uses electromagnetic/ hydraulic/ pneumatic engagement