Structures and mechanisms

types

Mass

Suspended

Truss

Frame

force

stress

strong

Compression

tension/traction

bending

torsion

shear

rigidity

rigid, no deformable

equilibrium

equilibrium

stability

stable

strong

depends on

types of forces applied

shape of the stucture

obtain

making more stable

making more rigid

stable

center of gravity

trussing

thanks to the triangle

diagomal bar

a brace

stay cables

sections

beams

columns

open and closed

machine

driver element

driven element

converting and/or transmitting element

mechanisms

types of motion

linear motion

rotary motion

reciprocating motion

oscillating motion

function

motion transmission

liner transmission

levers

pulleys

rotary transmission

gears

friction wheels

motion conversion

cams

screw and pinion

levers

F·d1=R·d2

Class 2 levers

Class 3 levers

Class 1 levers

pulleys

W1·d1=W2·d2 / W1·Z1=W2·Z2

fixed puelleys

moveable puelleys

friction wheels

rotrates in the opposite direction

can slip

can be subject to wear and tear

belt and pulley system

Subtopic

Subtopic

gears

large power transmission

a lot of friction

noisy

chain and sprocket system

don't slip

need greasing

noisy

worm gear

speed producer

compact and quiet

isn't reversible

screw and nut

a good speed reducer

reversible

rack and pinion

smooth and precise

reversible

ceank and slider

reversible

cams

convert rotary motion into
linear reciprocating motion

eccentric cam

wedge

ramp

ratchet

the first technological designer

worm gear

screw and nut mechaism

different gears