Motion Transformation Systems
-
Upload
brennan-stephenson -
Category
Documents
-
view
18 -
download
1
description
Transcript of Motion Transformation Systems
![Page 1: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/1.jpg)
Motion Transformation Systems
The mechanical fxn of relaying a motion from 1 part to another while altering the nature of the motion.
![Page 2: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/2.jpg)
5 Systems1) Rack and Pinion Systems
2) Screw Gear Systems Type 1
3) Screw Gear Systems Type 2
4) Cam and Follower Systems
5) Slider-Crank Mechanisms
![Page 3: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/3.jpg)
Rack and Pinion Systems
Rotation to TranslationorTranslation to Rotation
Reversible
![Page 4: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/4.jpg)
Rack and Pinion
• at least 1 gear = a pinion• 1 straight bar with teeth = rack• teeth on rack and pinion must be identical• frequent lubrication• the greater the # of teeth the slower the rotation
![Page 5: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/5.jpg)
Rack and Pinion Animation
http://www.youtube.com/watch?v=D3MrUngdlCQ
![Page 6: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/6.jpg)
Screw Gear SystemsType 1 • the screw is the driver• rotational is transformed into translational• e.g. jacks for lifting cars
![Page 7: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/7.jpg)
Screw Gear Type 1Scissor Car Jack
http://www.youtube.com/watch?v=QeB2YxMqogI
![Page 8: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/8.jpg)
Screw Gear SystemsType 2• the nut is the driver• rotational to translational• e.g. pipe wrenches
![Page 9: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/9.jpg)
Screw Gear Type 2Pipe Wrench
http://www.youtube.com/watch?v=HYspwtCZ1yo
![Page 10: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/10.jpg)
Screw Gear Systems
• type 1 (car jack) has the nut connected to the screw so that the nut cannot rotate
• in both systems the threads of the screws and nuts must match
• type 2 (monkey wrench) has the nut fixed so that its only possible motion is rotational
![Page 11: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/11.jpg)
Cam and Follower Systems
• transform the rotational motion of a cam into the recriprocating translational motion of a follower
• a back and forth movement like that of a sewing machine
• cams = rotational axis is centred• eccentric cams = rotational axis is off-centre
![Page 12: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/12.jpg)
Cam and Follower
• the follower must be guided in its translational motion
• the shape of the cam determines how the follower will move
• a device such as a return spring is usually necessary to keep the follower in continual contact with the cam
![Page 13: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/13.jpg)
Cam and follower
http://www.youtube.com/watch?v=ZbdsGf_t8hs
![Page 14: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/14.jpg)
Slider-Crank Mechanisms
• used in internal combustion engine
• to transform the translational motion of the pistons into the rotational motion of the crank
![Page 15: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/15.jpg)
Slider - Crank Mechanisms
• the connecting rod contains 2 bushings to attach it to the crank and piston
• the cylinder must guide the part moving in translation
• frequent lubrication
![Page 16: Motion Transformation Systems](https://reader036.fdocuments.in/reader036/viewer/2022072015/56813066550346895d964058/html5/thumbnails/16.jpg)
Slider - Crank Mechanisms
http://www.youtube.com/watch?v=KnASJHtbGB0