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:star: MECHANISMS:star: (Lever: law of the lever; F·d=R·r (class 1 image,…
:star: MECHANISMS:star:
Lever: law of the lever; F·d=R·r
class 1
class 2
class 3
A fixed pulley is balanced when the effort F is equal to the resistance of the
load, R:
F = R
A moveable pulley is balanced when it satisfies this equation
F=R/2
Friction drives
Gear mechanisms and cogwheels
Worm gear
gear mechanisms with chain
Gear train
Pulley trains with belts
Gear mechanisms and cogwheels
worm gear
Gear mechanisms with a chain
The relation between the rotation velocities of the wheels depends on the
number ofteeth on each gear
gear train The gear ratio between the drive wheel (I) and the drive wheel (4) dependson the number of geared teeth in the system:
Pulley trains with belts
The gear radio between the drive pulley (I) and the driven pulley l4) depends
on the relauve size of the pulleys in the system. It's expressed as a function of
their diameters
Rack and pinion system
the ratio between the number of rotations of the pinion and the velocity of
the movement of the rack is expressed by this equation:
L=P·Z·N
Winch and crank handle
A winch is balanced when it satisfies this equation
