Structures and mechanisms

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Structures and mechanisms

Leaonardo da Vinci

the first technological designer

different gears

screw and nut mechaism

Other mechanisms

ratchet

ramp

wedge

Motion conversion mechanisms

eccentric cam

convert rotary motion into linear reciprocating motion

ceank and slider

rack and pinion

smooth and precise

screw and nut

reversible

a good speed reducer

Rotary transmission mechanisms

worm gear

isn't reversible

compact and quiet

speed producer

chain and sprocket system

need greasing

don't slip

noisy

a lot of friction

large power transmission

belt and pulley system

Subtopic

can be subject to wear and tear

can slip

rotrates in the opposite direction

Simple machines

W1·d1=W2·d2 / W1·Z1=W2·Z2

moveable puelleys

fixed puelleys

F·d1=R·d2

Class 1 levers

Class 3 levers

Class 2 levers

Machines and mechanisms

mechanisms

function

motion conversion

screw and pinion

cams

motion transmission

rotary transmission

friction wheels

gears

liner transmission

pulleys

levers

types of motion

oscillating motion

reciprocating motion

rotary motion

linear motion

machine

converting and/or transmitting element

driven element

driver element

increase rigidity.Trusses

sections

open and closed

columns

beams

stay cables

a brace

trussing

diagomal bar

thanks to the triangle

Increase stability

center of gravity

Strengthening elements

obtain

making more rigid

making more stable

depends on

shape of the stucture

types of forces applied

Conditions for strong structures

stability

stable

equilibrium

rigidity

rigid, no deformable

Types of stress

shear

torsion

bending

tension/traction

Compression

Forces,stresses and strength

strong

stress

force

Structure

types

Frame

Truss

Suspended

Mass