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3NT Mechanisms

Mechanisms
by

Eugene Tan

on 27 April 2011

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Transcript of 3NT Mechanisms

Mechanisms
Motion
Levers
Gears
Pulleys
Cranks
Rack-and-Pinion
Linkages
Cams
Linear
Rotary/ Circular
Reciprocating
Oscillating
First Class
Second Class
Third Class
Function
small input force to
create a large output
force
Move loads
increase movement
change direction of movement
Fulcrum/ pivot in the middle
Scissors
Pliers
Load in the middle
Wheelbarrow
nutcracker
Effort in the middle
Broom
Fishing rod
Function
Control speed
Increase turning force
Change direction of motion
Spur Gear
Bevel Gear
Worm Gear
2 gears meshed together
meshing rotate in oposite direction
smaller gear turn faster than bigger gear
Idler gear
placed in between driver
and driven gear to make both
gears turn in same
direction
Gear train
made by many gears
meshed together
can significantly increase or
decrease
- turning speed
- turning force
Transmit motion through 90°
Worm gear
turns a worm wheel
reduces turning speed
increases turning power
One complete turn of worm gear
turns worm wheel by one tooth
Function
transmit motion
transmit power
Simple pulley system
- 1 single pulley
Compound Pulley System
- multiple pulleys
- less effort needed
Open drive system
- belt in a loop
- both pulleys turn in
same direction
Crossed drive system
- belt criss-crossed
- pulleys turn in opposite
direction
Rotate to cause a rod
or lever to move
Converts circular motion
into either reciprocating
or oscillating motion
3 Profiles
eccentric
snail
pear
4-bar linkages
Used to convert motion from
one type to another
one speed to another
one size to another
one axis to another
Applications
Windshield wiper
Scissors platform
Clothes rack
An arm with connected to a shaft
Can be used alone as handles
Usually connected to other
mechanical components
Crank & Slider
used to convert rotary motion to
reciprocating motion or vice versa
Applications
Bicycle pedal
Fishing reel
Straight tooth 'rack' meshed
with a toothed wheel or pinion
Converts rotary motion to linear
or vice versa
Fixed pinion, free rack
Pinion turns on spot
Rack moves forward
or backwards
Free pinion, fixed rack
Pinions turns and move
forward and backward
Rack remains stationary
Applications
DVD player
Bench drill
Camera tripod
Full transcript