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MECHANISM (CLASSIFICATION (Transmitting motion (linear, rotary),…
MECHANISM
CLASSIFICATION
Transmitting motion
linear
rotary
Transforming motion
rotary to linear
rotary to reciprocating
Controlling and regulating motion
Joining elements
Storing energy
LINEAR MOTION MECHANISM
LEVERS ( F x d = R x r )
R ( load)
d distance from F to the fulcrum
F (effort)
r distance from R to the fulcrum
Fixed pulley ( F = R )
Movable pulley ( F = r/2)
Compound pulley ( F = R/2n) n= number of movable pulleys
OTHER MECHANISMS
MECHANISMS THAT STORE ENERGY
CONNECTING MECHANISM
MECHANISMS FOR CONTROLLING AND DIRECTING MOTION
SUPPORTS: BUSHINGS AND BEARING
MECHANISMS THAT TRANSFORM MOTION
FROM ROTARY INTO LINEAR
nut and bolt systems
winch and crank handle F x d= R x r
rack and pinion system L = P x Z x N
FROM ROTARY INTO RECOPROCATING MOTION
crankshaft
cam
crank link slider
eccentric cam
ROTARY MOTION MECHANISMS
Transmit motion and effort in a circular way from the
input
to the
output
pulleys with belt
( two pulleys or wheels that are a certain distance apart)
Their axles are parallel and they rotate simultaneously due to the effect of the belt
gear mechanisms and cogwheels
(N, Z ,=N ,.Z,)
N are the velocities of the correponding wheels
Z numbers of teeth
friction drives
( N, x D, = N, x D)
D
corresponding
diameters
N
are the velocities of the
primary drive wheel
and the
output wheel
worm gear
screw
that moves a
helical cogwheel
that is set
perpendicular
to the screw
gear mechanism whit 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.
Relation between the rotation veloaties of the wheels depends on the number ofteeth on each gear.
gear train
system of more than two gears, connected together as shown in
the diagram
The gear ratio between the drive wheel (I) and the driven wheel (4) depends on the number ol geared teeth in the system:
pulley trains whit bells
The gear ratio between the drive pulley (I) and the driven pulley depends on the relative size of the pulleys in the system. It's expressed as a function of their diameters
