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MECHANISMS - Coggle Diagram
MECHANISMS
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Rotary motion mechanisms
Friction drives
The first wheel is called the primary drive wheel When it moves, it turns or drives the second or output wheel, causing it to move as well.
he ratio between the rotation velocity of the wheels or pulleys depends on the relative size of the wheels. velooty N. It is expressed by the followmg equation N · D = N,· D
N1 and N2 are the velocities of the primary drive wheel and the output wheel. These velomties are expressed in revolutions per minute (rpm)
D1 and D2 are the corresponding diameters. They are expressed in units of length: usually millimetre
Pulleys with belt
They consist of two pulleys or wheels that are a certain distance apart. Their axles are parallel and they rotate simultaneously due to the effect of the belt. The rotation of one axle is transmitted to the other through the connected pulleys. The two pulleys, and the two axles, rotate in the same direction
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Gear train
This is a system of more than two gears, connected together as shown in the diagram. The rotary motion of the first wheel (1) drives the second wheel (2), and so on. In this system, the rotary movement of the first axle is transmitted to the second by means of wheels 1 and 2
Pulley trains with belts
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 transmitted to pulley 4 by the belt that connects them. All the wheels rotate in the same direction
Variation in velocity
Wh e n the wheels and the gears have the same diameter or the same number of teeth, they rotate at the same velocity. When they are different sizes, the smallest rotates more quickly
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Linear motion mechanisms
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Fixed pulley
A fixed pulley is balanced when the effort F is equal to the resistance of the load, R:
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Compound pulley
This is a system of fixed and moveable pulleys, often called block and tackle. If we use morepulleys, the system becomes more complex, but less effort is needed to move the load
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Other mechanisms
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Connecting mechanisms
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Mo v able connections are used to connect shafts that can move
along the axle or at an angle to each other. There are two main types: Oldham joints and Cardan joints.
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Mechanisms are devices that transmit and convert forces and motion from a
diving force or input element to an output element.
