Mechanics Clutch Quiz Flashcards
(20 cards)
What are the 3 types of clutches?
Friction, Electromagnetic, and Mechanical
What is the purpose of a clutch?
Power transmission
What are the actuation methods for clutches?
Mechanical, Electromagnetic, Pneumatic, and Hydraulic
What is the most common type of clutch?
Friction
What are the 3 types of Electromagnetic clutches?
Magnetic Particle, Eddy Current, and Hysteresis
Which creates more torque, Friction or Electromagnetic?
Friction
What are Electromagnetic clutches used for?
Light to medium duty applications
How are magnetic particle clutches engaged?
Electromagnetic force
What happens when power is supplied to a magnetic particle clutch?
Magnetic lines of flux span the space, and particles line up to form a bond between the input and output members.
What are magnetic particle clutches typically used for?
Tensioning and positioning applications which require continuous speed changes.
Which clutch type is one of the oldest and most basic style.
Direct mechanical connection
Why would you use direct mechanical contact clutches?
When exact no slip engagement and cycling is required.
What are the types of mechanical clutches?
Square Jaw, Spiral Jaw, Multiple Tooth, Wrap Spring, Sprag, Ramp and Roller, and Centrifugal.
Describe Square Jaw clutches.
Square teeth which lock into recesses in facing members, providing instant positive engagement in either direction. (Bidirectional)
Describe Spiral Jaw Clutches.
Ramped surfaces on on side of the teeth, allowing the clutch to be engaged at speeds up to 150RPM. (1 directional)
Describe Multiple Tooth Clutches.
Similar to a jaw clutch. Includes the advantages of mechanical lock up while allowing all forms of actuation. Significantly higher torque than friction style.
Describe Wrap Spring Clutches.
Input/Output members linked with coiled spring. Rotation toward the drive tightens/wraps the spring and transmits torque while reversed rotation will not.
Describe Sprag Clutches.
Use cylindrical inner and outer races with sprags inside. Sprags wedge between both races, transmitting torque when rotates in drive direction.
Describe Ramp and Roller Clutches.
Similar to sprag. In 1 direction, the roller moves along the ramp and wedges between the input/output and drives, but not the other direction.
Describe Centrifugal Clutches.
Input hub with friction shoes held in place. As it rotates, these shoes press against the outer race. More speed causes more torque..
