MECHANISMS

1. Rotary-linear transformation
   1. wheel

      Anotações:

      • We use in vehicles
   2. rack and pinion

      Anotações:

      • We use for sliding doors, conveyor belts and other devices
   3. nut and bolt

      Anotações:

      • we use to hold things together. We find them in scissor jacks for lifting cars
   4. winch and crank

      Anotações:

      • We uses winches for lifting loads. We find them in construction cranes and in the window blinds
2. Reciprocating rotary-linear tranformation
   1. crank and rod

      Anotações:

      • We find them in internal combustion engines, such as windscreen wiper mechanisms
   2. crankshaft

      Anotações:

      • We use for combustion motors that use pistons
   3. cam

      Anotações:

      • We can find in toys, automatic tools and combustion motors.

1. direction control: ratchets

   Anotações:

   • We find ratchets in watches, cable-tensors, and elevator brake systems.
2. speed reduction: brakes
   1. disc brakes

      Anotações:

      • apply pressure to the disc
   2. band brakes

      Anotações:

      • applies pressure to the outside of the drum 
   3. drum brakes

      Anotações:

      • apply pressure to the inside of the drum

1. accumulation: springs

   Anotações:

   • Release the energy in a controlled way
   1. we push on compression springs

      Anotações:

      • we use in sofas
   2. we pull on traction springs

      Anotações:

      • we use in metallic bed frames
   3. we bend torsion springs

      Anotações:

      • we use in clothes pins
2. dissipation: suspension systems
   1. shock absorbbers

      Anotações:

      • are usually made with spiral steel springs
   2. leaf springs

      Anotações:

      • are made with long, curved pieces of steel of different lengths

1. rigid coupligs

   Anotações:

   • form a permanent connection between two shafts
2. clutches

   Anotações:

   • form a rigid connection which isn't permanent 
   1. friction clutch

      Anotações:

      • when one shaft turns there is a friction, this turns the second shaft.
   2. jaw clutch

      Anotações:

      • the ends of two shafts are connected by interlocking teeth. It doesn't slip easily
3. flexible coupligs
   1. oldham coupling

      Anotações:

      • is used to connect shafts that are not perfectly aligned 
   2. cardan joint

      Anotações:

      • connects two shafts that are an angle to each other. We use in cars

1. antifiction bearings

   Anotações:

   • are used in many machines
   1. the inner ring

      Anotações:

      • is in contact with the rotating shaft
   2. the outer ring

      Anotações:

      • is connected to the rest of the mechanism
   3. the rolling elements

      Anotações:

      • are cylindrical rollers or round balls
   4. the retainer

      Anotações:

      • keeps the rolling elements in position
2. plain bearings

   Anotações:

   • are formed by two rings, are made of smooth material, but need lubrication to reduce friction

Anotações:

• There is a freewheel chain mechanism on your bicycle and cars

1. transmits motion in one direction
2. turns freely in the opposite direction.