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Mechanisms Presentation.notebook
1
July 13, 2015
Sep 248:07 AM
Mechanisms
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A mechanism is a device that contains two or more pieces arranged to move in series, or
together.
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Mechanisms are used to:
• Change the direction of movement• Change the type of movement• Change the speed of the output• Change the torque or force of the output.
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Changing Direction:
Gears that are laced together move in opposite directions.
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Gear Trains:
Gear trains, or a series of gears put together, always have a drive gear (the input) and a
driven gear (the output).
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Power Flow:
The flow of power is reversible if you can move the driven gear and the drive gear
moves also.
Not all mechanisms are reversible!
Mechanisms Presentation.notebook
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July 13, 2015
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Types of Outputs:Rotary
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Types of Outputs:Linear
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Types of Outputs:Reciprocating
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Types of Outputs:Oscillating
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Force vs. Torque
Force: linear
Torque: circular
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Speed and Torque
Speed and Torque have an inverse relationship:
• If speed goes up, torque goes down.• If speed goes down, torque goes up.
Mechanisms Presentation.notebook
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July 13, 2015
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Gear Ratios:Gear ratios compare input and output.
Count the teeth to compare.
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If the input gear is larger than the output gear, the speed is increased.
If the output gear is larger than the input gear, the torque is increased.
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Example:
Input: 32 tooth gear
Output: 8 tooth gear
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Example:
Input: 5 tooth gear
Output: 40 tooth gear
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Mechanisms Presentation.notebook
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