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Mechanisms (Rotary Motion Mechanisms (These mechanisms transmit motion and…
Mechanisms
Mechamsms are devices that transmit and convert forces and motion from a driving force or input element to an output element.
They allow us to carry out certain tasks more easily and more efficiently
Linear Motion Mechanisms
levers and fixed, mobile and compound pulleys.
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Rotary Motion Mechanisms
These mechanisms transmit motion and effort in a circular way, from the input to the output.
include: friction drives, pulley systems, gears and worm gears.
N·D=N2·D2 --> D1/D2=N1/N2
N1 and N2 are the velocities of the primary drive wheel and the
output wheeL
D1 and D2 are the corresponding diameters
The ratio D1/D2, is called the gear ratio.
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Gear mechanisms and cogwheels
Cogwheels are sets of wheels that have teeth called cogs.
N1·Z1=N2·Z2 --> Z1/Z2=N1/N2
N1 and N2 are the velocities of the corresponding wheels
Z1 and Z2 are the numbers of teeth.
Worm gear: This is a screw that moves a helical cogwheel that is set perpendicular
to the screw
N wheel= N screw·Z grooves/ Z screw
Gear Mechanisms with a chain
These are two cogwheels with parallel axles that are a certain distance apart, they rotate simultaneously by means of a metal chain or a toothed belt stretched over both wheels.
N1·Z1= N2·Z2--> Z1/Z2=N1/N2
N1 and N2 are the velocities of the corresponding wheels
Z1 and Z2 , are the number of teeth
Gear Train:
This is a system of more than two gears, connected together as shown in
the diagram
N4/N1= Z1·Z3/Z2·Z4
Pulley trains with belts:
It's a system of pulleys, or wheels, with a belt
formed by more than two wheels.
N4/N1= D1·D3/D2·D4
N1 and N4 are the respective velocities of the drive and driven
pulleys.
D1,D2,D3 and D4 are the diameters of each wheel.
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