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MECHANISMS (ROTARY TRANSMISION (CHANGES IN SPEED (INCREASING (D1>D2…
MECHANISMS
ROTARY TRANSMISION
FRICTION WHEELS
PULLEYS WITH BELTS
INTERLOCKING GEARS
SPROCKETS WITH CHAINS
CHANGES IN SPEED
INCREASING
D1>D2 N2>N1
CONSTANT
D1=D2 N2=N1
DECREASING
D1<D2 N2<N1
SPEED RATIOS
N2/N1=D1/D2
BELT DRIVES AND GEAR TRAINS
N4/N1=D1xD3/D2xD4
LEVERS
CLASS 1
R-fulcrum-F
CLASS 2
fulcrum-R-F
CLASS 3
fulcrum-F-R
TORQUE=FORCExDISTANCE
LAW OF A LEVER
Fxd=Rxr
F=FORCE
d=DISTANCE FROM THE FULCRUM
R=RESISTANCE
r=DISTANCE FROM THE FULCRUM
INTRODUCTION
TRANSMIT AND TRANSFORM MOTION
PARTS
INPUT OF FORCE AND MOTION
MECHANISM
OUTPUT FORCE AND MOTION
PULLEYS AND COMPOUND PULLEY SYSTEMS
PULLEYS
FIXED PULLEY
F=R
MOVABLE PULLEY
F=R/2
COUMPOUND PULLEY SYSTEMS
VERTICAL SYSTEM
F=R/2xn
n= number of movable pulleys
HORIZONTAL SYSTEM
F=R/2xn
EXPONENTIAL SYSTEM
F=R/2^n
TRANSFORMATION OF MOTION
ROTARY-LINEAR TRANSFORMATION
WHEEL
2x3'14xr
RACK AND PINION MECHANISM
SLIDING DOORS
NUT AND BOLT MECHANISMTO HOLD THINGS TOGETHER
WINCH AND CRACK MECHANISM
FxD=Rxr
LIFTING LOADS
RECIROCATING ROTARY-LINEAR TRANSFORMATION
CRACK AND ROD MECHANISM
STEAM ENGINES
CRANKSHAFT
SEWING MACHINES
CAM MECHANISMS
TOYS
MECHANISMS THAT CONTROL MOTION
DIRECTION CONTROL
RATCHETS
ONLY ONE DIRECTION
CABLE-TENSORS
SPEED REDUCTION
BRAKES
USING FRICTION
ACTIVATED BY A LEVER
TYPES
DISC BRAKES
DISC CONNECTED TO AN AXLE
BAND BRAKES
DRUM IS CONNECTED TO AN AXLE
DRUM BRAKES
DRUM CONNECTED TO AN AXLE
A PAIR OF BRAKES PRESSURE INSIDE THE DRUM
ENERGY ACCUMULATION MECHANISMS
ACCUMULATION
SPRINGS
COMPRESSION SPRINGS
TRACTION SPRINGS
TORSION SPRINGS
SOFAS,BEDS
DISSIPATION
SUSPENSION SYSTEMS
SHOCK ABSORBERS
LEAF SPRINGS