Elenco Tumbling Robot Manual do Utilizador descarregar pdf (Página 9)

Various Linkage

MECHANISM OF MACHINES MASTER CLASS

CRANK

-TRANSFER ROTATIONAL MOTION TO LINEAR MOTION-

A crank is a system that change

a rotational motion into a linear

sliding motion. It is widely used

in many equipments just like

gears and belts.

•Basic structure of a crank

A crank has a circular disk called crank and a straight

rod attached at an off center location of the disk. As

crank rotates, the end of the rod slides linearly.

Crank

Front Windshield

Wiper blade

Axis of a motor

rod

• Crank of a Car Engine

A gasoline explosion in a

cylinder pushes down the

piston. This motion of the

piston is transferred by

connecting rod to the crank

and to the flywheel

(attached at the end of the

crankshaft, but omitted from

the illustration). The

flywheel keeps the

momentum of the rotation.

The crank keeps rotating

and pushes the piston back

up. The piston moves up

and down and the crank

shifts that motion into

rotational motion.

•Windshield Wiper

Windshield wiper of a car

uses a crank to change

rotational power of a motor

to sliding motion so that

the wiper blades move side

to side on a windshield.

There are various linkage technics to power one part

of the system and move other parts in different

patterns. There are many more technics other than

the examples of windshield wipers and car engines.

Combining a crank

and a slider, a

rotational motion

can be changed

into linear sliding

motion or vice

versa.

Joining four bars and

form a loop, one side

to side motion can be

changed to another

side to side motion.

Combining a

crank and a four

bar linkage, a

rotational

motion can be

changed into a

side to side

fanning motion

or vice versa.

Crank Slider Mechanism

Four Bar Linkage with Crank

Four Bar Linkage

CRANK

Worm

Piston

Cylinder

Connecting rod

Crank

Crankshaft

Crank Connecting Rod

16 17

JR. SCIENTIST

TUMBLING ROBOT

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