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MECHANISMS (Rotary motion mechanisms (Friction drives (The ratio between…
MECHANISMS
Rotary motion mechanisms
Friction drives
The first wheel is called the primary drive wheel. When it moves, it turns or drives the second or output wheel, causing it to move as well
The output wheel rotates in the opposite direction of the primary wheel. lf we use more than two wheels, each one rotates tn the opposite direction to the one next to it.
The ratio between the rotation velocity of the wheels or pulleys depends on the relative size of the wheels
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They include friction drives, pulley systems, gears and worm gears
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worm gear
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Each time the screw rotates, the gear moves forward as many teeth as there are grooves in the screw, usually a small number: 1, 2 or 3
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pulley trains with belt
the gear rauo between the drive pulley and the driven pulley depends on the relative size of the pulleys in the system. It's expressed as a function of their diameters
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gear train
This is a system of more than two gears,
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linear motion mechanisms
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pulleys
movable pulleys
A moveable pulley ts a set of two pulleys, one is fixed while the other can move in a linear direction.
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compound pulleys
this is a system of fixed and moveable pulleys, often called block and tackle
If we use more pulleys, the system becomes more complex, but less effort is needed to move the load.
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fixed pulleys
it's a wheel that has a groove around lt into which a rope,
chain or belt fits. It rotates around an axle that is fixed to an immobile surface
A fixed pulley is balanced when the effort F is equal to the resistance of the
load, R
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pulleys
movable pulleys
A moveable pulley is a set of two pulleys one is fixed while the other can move in a linear direction
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compound pulleys
This is a system of fixed and moveable pulleys, often called block and tackle
If we use more pulleys, the system becomes more complex, but less effort is needed to move the load
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fixed pulleys
A fixed pulley is a wheel that has a groove around lt into which a rope, chain or belt fits. It rotates around an axle that is fixed to an immobile surface
Mechanisms are devices that transmit and convert forces and motion from a
drivig force or input element to an output element