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MECHANISM (Diving force (Friction drives (Pulleys with belt (Gear…
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Around us we can see many moving objects and mechanisms that produce movement that we can also call motion
Mechanisms are devices that transmit and convert forcs and motion from a drivmg force or input element to an output element.
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Compound pulley
This ts a system of fixed and moveable pulleys, often called block and tackle
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The driving force can be a spring, an electric motor or our own muscles.
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The first wheel is called the primary drive wheel. When it moves, it
turns or drives the second our output wheel , causing it to move as wheel.
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The ratio between the rotation velocity of the wheels or pulleys depends on the relative size of the wheels.
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N1 and N2 are the velocities of the primary drive wheel and output wheel. These velocities are expressed in revolution per minute.
D1 and D2 are the corresponding diameters .Ther are expressed in units of length: usually millimetres. The ratio D1/D2 is called the gear ratio
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The two pulleys, and the two axles, rotate in the same direction.
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The cogs fit into the spaces between the cogs of another wheel, so that one wheel moves the other.
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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 → Z1/Z2 = N2/N1
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This is a system of more than two gears, connected together.
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Z1,Z2,Z3 and Z4 are the number of teeth on the wheels.
It's a system of pulleys, or wheels, with a belt formed by more than two wheels.
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D1,D2,D3 and D4 are the diameters of each wheel.
