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

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