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MECHANISMS (1.Clasification (transmiting motion (linear, rotary),…
MECHANISMS
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these mechanisms transmit motion and effort in a circular way, from the input to the output .
They include friction drives, pulley systems, gears and worn gears:
friction drives : the ratio between the rotation veloaty of the wheels or pulleys depends on the relative size of the wheels.Ecuation: N1xD1=N2xD2
gear mechanisms and cogwheels:.Cogwheels are sets of wheels that have teeth called cogs. The ratio between the rotation velocities of the wheels depends on the
number of teeth on each wheel. It's expressed by this equation: N1 x Z1 = N2 x Z2
worm gear : this is a screw that moves a helical cogwheel that is set perpendicular to the screw . A worm screw fulfils this equation:
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3.Fixed pulley
A fixed pulley is balanced when the effort F is equal to the resistance of the load , R : F = R
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compaund pulley:
This ts a system of fixed and moveable pulleys, often called block and tackle .
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