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Mechanisms - Coggle Diagram
Mechanisms
- classification of mechanisms
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- controlling and regulating motion
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- 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
- If we use more pulleys, the system becomes more complex, but less effort is needed to move the load
- the ration between the rotation velocity of the wheels or pulleys depends on the relative size of the wheels :
N1 and N2 are the velocities of the primary drive wheel and the output wheel (rpm); D1 and D2 are the corresponding diameters; D1/D2 is called the gear ratio
- they consist of two pulleys or wheels that are a certain distance apart ; their axles are parallel and they rotate simultaneously due to the efffect of the belt ;
- gear mechanisms and cogwheels
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- cogwheels are sets of wheels that have teeth called cogs ; the cogs fit into the spaces between the cogs of another wheel, so that one wheel moves the another ; they transmit a rotary motion between the two connected axles, which can be parallel, perpendicular or oblique ;
- this is a screw that moves a helical cogwheel that is set perpendicular to the screw; each time the screw rotates, the gear moves forward as many teeth as there are grooves in the screw, ussualy small number: 1, 2 or 3;
- gear mechanism with a chain
- there 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;
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- this is a system of more than two gears, connected together as shown in the diagram
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the rotary motion of axle 1 is transmitted to axle 2 by the belt that connects them; pulleys 2 and 3 rotate at the same velocity; the motion of pulley 3 is transmittded to pulley 4 by the bell that conects them; all the wheels rotate in the same direction;
when the wheels and the gears have the same diameter or the same number of teeth, they rotate at the same velocity; when they're different sizes the smallest rotates more quickly;
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- mechanisms that transform motion
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- from rotary to reciprocating
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- mechanisms for controlling and directing motion
- mechanisms that store energy
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- supports: bushing and bearings