Breaks And Cluthes Flashcards

1
Q

What do clutches do?

A

Smooth transmission of power
Protect machines or saftey feature

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2
Q

What are breaks used for?

A

Stop slow or hold a load

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3
Q

What are the methods of power transmission?

A

Friction types
Magnetic and electromagnetic
Mechanical lockup

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4
Q

What are the methods of actuation of power transmission?

A

Hydraulic
Pneumatic
Electromagnetic
Mechanical

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5
Q

Lines of flux is?

A

Putting current into a coil creating magnatisum

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6
Q

Friction types

A

Rotation in both directions
Heat generation / heat dissipation

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7
Q

Electromagnetic

A
  • 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

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8
Q

Direct mechanical lock up

A

-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

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