MOTION TRANSFORMATION
MOTION TRANSFORMATIONMotion transmission systems transmit motion
without changing the motion itself (rotation to rotation etc....)
Motion transformation, on the other hand is the mechanical function of relaying a motion from one part to another while altering the nature of the motion
Like motion transmission, there are 5 common motion transformation systems
MOTION TRANSFORMATION1) Rack and Pinion SystemsTransforms rotation to translation or
translation to rotationIs reversible This system contains at least one gear
(pinion) and one rack (straight bar with teeth)
MOTION TRANSFORMATIONRack and pinion systems are used as steering
mechanisms on vehicles
MOTION TRANSFORMATION
Screw and Gear systems (type 1)Transforms rotation into translationIt is not reversibleIn this type, the screw is the driverIts rotation causes the nut to move
translationally
MOTION TRANSFORMATIONScrew and Gear Systems (Type 2)Transforms rotation into translation alsoIs not reversibleIn this type, the nut is the driverIts rotation causes the screw to move
translationally
MOTION TRANSFORMATIONCam and follower SystemsTransforms rotation in to translationIs not reversibleRotational motion of the cam causes the
follower to move in a translation plane of motion (back and forth or up and down)
The shape of the cam determines how the follower will move
A spring is often used to keep the follower in contact with the cam
MOTION TRANSFORMATION
MOTION TRANSFORMATIONSometimes cams that have an off-center axis
of rotation are used – these are called eccentrics
MOTION TRANSFORMATIONSlider – Crank mechanismsPerform rotation in to translation or
translation in to rotationThey are reversibleThis motion transformation system is used in
internal combustion engines to transform the translation motion of the pistons in to rotation motion of the crank which cause the wheels to turn
MOTION TRANSFORMATION
MOTION TRANSFORMATIONAnswer questions 15 – 17 on page 452
http://www.petervaldivia.com/technology/mechanisms/gears.php
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