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MECHANISMS (ROTARY MOTION MECHANISMS (GEAR MECHANISMS AND COGWHEELS…
MECHANISMS
ROTARY MOTION MECHANISMS
FRICTION DRIVES
Friction drives are made up of two or more wheels that are in contact. 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
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
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GEAR TRAIN
This is a system of more than two gears, connected together as shown in the diagram
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VARIATON IN VELOCITY
Apart from transmitting force and motion, rotary transmission mechanisms allow velocity to vary
When 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
LINEAR MOTION MECHANISMS
LEVERS
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TYPES OF LEVERS
There are three types of levers: class 1, class 2 and class 3
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FIXED PULLEY
DEFINITION
A fixed pulley is a wheel that has a groove around it into which a rope chain or belt fits. It rotates around an axle that is fixed to an inmobile surface
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MOVABLE PULLEY
DEFINITON
A movable pulley is a set of two pulleys one is fixed while the other can move in a linear direction
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COMPOUND PULLEY
DEFINITION
This is a system of fixed pulleys, often called block and tackle. If you use more pulleys, the system becomes more complex, but less effort is needed to move the load
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DEFINITION
Mechanisms are devices that transmit and convert forces and motion from a driving force or input element to an output element. They allow us to carry out certain tasks more easily and efficiently
Around us we can many moving objects and mechanisms that produce movement that we can also call motion. The chain gear system of a bicycle the gears of a clock or watch the lever in a seesaw and the pulley in a well are some of the simpler mechanisms that can be found in many objects
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