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MECHANISM:are devices that transmit and convert forces and motion from a
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MECHANISM:are devices that transmit and convert forces and motion from a
driving force or input element to an output element.
A lever is a rigid bar that is supported by a fulcrum.
The following equation indicates a balanced lever:
F · d = R · r
It is called the law of the lever.
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A fixed pulley is balanced when the effort F is equal to the resistance of the load, R. (F = R)
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If we use more pulleys, the system becomes more complex, but less
effort is needed to move the load.
F = R / (2n)
F = R / 2^n
The ratio between the rotation velocity of the wheels or pulleys depends on the relative size of the wheels.
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D, and D, are the corresponding diameters
They are expressed in units of length: usually millimetres
The ratio D/D, is called the gear ratio.
Gear mechanism and cog wheels (and gear mechanism with a chain). Cogwheels are sets of wheels that have teeth called cogs. Z are the numbers of teeth. N1 • Z1 = N2 • Z2
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Mechanism for controlling and directing motion.
The most typical mechanism of this type is the ratchet, which allows rotation in one direction but impedes it in the oppositedirection, as you can see in the diagram.
Disc brakes, band brakes and drum brakes.
mechanism that store energy.
Springs are devices that absorb energy This energy can be released later, little by lit tle or all at once.
Springs work in different ways:
By compression
By traction
By torsion
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