ken youssefiuc berkeley 1 introduction to mechanisms
TRANSCRIPT
![Page 1: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/1.jpg)
1UC BerkeleyKen Youssefi
Introduction to Mechanisms
![Page 2: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/2.jpg)
Ken Youssefi UC Berkeley 2
Mechanism
Machines are mechanical devices used to accomplish work. A mechanism is a heart of a machine. It is the mechanical portion of the machine that has the function of transferring motion and forces from a power source to an output.
Mechanism is a system of rigid elements (linkages) arranged and connected to transmit motion in a predetermined fashion.
Mechanism consists of linkages and joints.
![Page 3: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/3.jpg)
Ken Youssefi UC Berkeley 3
Example of Mechanism
Can crusher
Simple press
Rear-window wiper
![Page 4: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/4.jpg)
Ken Youssefi UC Berkeley 4
Example of Mechanisms
Moves packages from an assembly bench to a conveyor
Lift platformMicrowave carrier to assist people on wheelchair
![Page 5: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/5.jpg)
Ken Youssefi UC Berkeley 5
Example of Mechanisms
Lift platform
Front loader
Device to close the top flap of boxes
![Page 6: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/6.jpg)
Ken Youssefi UC Berkeley 6
Example of Mechanisms
Conceptual design for an exercise machine
Rowing type exercise machine
![Page 7: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/7.jpg)
Ken Youssefi UC Berkeley 7
Example of Mechanisms
Six-bar linkage prosthetic knee mechanism
Extension position
Flexed position
![Page 8: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/8.jpg)
Ken Youssefi UC Berkeley 8
Four-Bar Linkage
![Page 9: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/9.jpg)
Ken Youssefi UC Berkeley 9
Four-Bar Linkage Categories
![Page 10: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/10.jpg)
Ken Youssefi UC Berkeley 10
Four-Bar Linkage Categories
![Page 11: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/11.jpg)
Ken Youssefi UC Berkeley 11
4-Bar mechanisms
![Page 12: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/12.jpg)
Ken Youssefi UC Berkeley 12
4-Bar mechanismsS + l > p + q
4 double rocker mechanisms
![Page 13: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/13.jpg)
Ken Youssefi UC Berkeley 13
The Slider-Crank Mechanism
![Page 14: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/14.jpg)
Ken Youssefi UC Berkeley 14
Slider-Crank Mechanism
Offset slider-crank mechanism
![Page 15: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/15.jpg)
Ken Youssefi UC Berkeley 15
Slider-Crank Mechanism
In-line slider crank mechanism
The mechanism has a stroke B1B2 equal twice the crank length r2.
Locations B1 and B2 are called the extreme positions (limiting) of the slider
![Page 16: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/16.jpg)
Ken Youssefi UC Berkeley 16
The Slider-Crank Mechanism
![Page 17: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/17.jpg)
Ken Youssefi UC Berkeley 17
Slider-Crank Mechanism - Inversion
![Page 18: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/18.jpg)
Ken Youssefi UC Berkeley 18
Mechanism CategoriesFunction Generation Mechanisms
A function generator is a linkage in which the relative motion between links connected to the ground is of interest.
A four-bar hand actuated wheelchair brake mechanism
![Page 19: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/19.jpg)
Ken Youssefi UC Berkeley 19
Mechanism Categories
Function Generation Mechanisms
A four-bar drive linkage for a lawn sprinkler
![Page 20: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/20.jpg)
Ken Youssefi UC Berkeley 20
Mechanism CategoriesMotion Generation Mechanisms
In motion generation, the entire motion of the coupler link is of interest (rigid body guidance).
New Rollerblade brake system
![Page 21: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/21.jpg)
Ken Youssefi UC Berkeley 21
Mechanism CategoriesMotion Generation Mechanisms
Four-bar automobile hood linkage design
![Page 22: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/22.jpg)
Ken Youssefi UC Berkeley 22
Mechanism Categories
Path Generation Mechanisms
In path generation, we are concerned only with the path of a tracer point and not with the motion (rotation) of the coupler link.
Crane – straight line motion
![Page 23: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/23.jpg)
Ken Youssefi UC Berkeley 23
Primary Joints
![Page 24: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/24.jpg)
Ken Youssefi UC Berkeley 24
Higher Order Joints
![Page 25: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/25.jpg)
Ken Youssefi UC Berkeley 25
Motion Generation Mechanisms
Rotating a monitor into a storage position
Moving a storage bin from an accessible position to a stored position
![Page 26: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/26.jpg)
Ken Youssefi UC Berkeley 26
Motion Generation Mechanisms
Lifting a boat out of water
Moving a trash pan from the floor up over a trash bin and into a dump position
![Page 27: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/27.jpg)
Ken Youssefi UC Berkeley 27
Straight line Mechanisms
![Page 28: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/28.jpg)
Ken Youssefi UC Berkeley 28
Straight line Mechanisms
![Page 29: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/29.jpg)
Ken Youssefi UC Berkeley 29
Straight Line Mechanism
![Page 30: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/30.jpg)
Ken Youssefi UC Berkeley 30
Scotch Yoke Mechanism
![Page 31: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/31.jpg)
Ken Youssefi UC Berkeley 31
Geneva Mechanism
![Page 32: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/32.jpg)
Ken Youssefi UC Berkeley 32
Linear Geneva Mechanism
![Page 33: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/33.jpg)
Ken Youssefi UC Berkeley 33
Ratchet Mechanism
![Page 34: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/34.jpg)
Ken Youssefi UC Berkeley 34
Straight Beam Walking Mechanism
![Page 35: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/35.jpg)
Ken Youssefi UC Berkeley 35
![Page 36: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/36.jpg)
Ken Youssefi UC Berkeley 36
Roller and Flat Follower Cams
![Page 37: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/37.jpg)
Ken Youssefi UC Berkeley 37
Cylindrical Cam Mechanism
![Page 38: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/38.jpg)
Ken Youssefi UC Berkeley 38
Gears – Rack and Pinion
![Page 39: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/39.jpg)
Ken Youssefi UC Berkeley 39
Gears
Worm Gear Sets Bevel gears Planetary Gear set
![Page 40: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/40.jpg)
Ken Youssefi UC Berkeley 40
V-8 Engine
![Page 41: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/41.jpg)
Ken Youssefi UC Berkeley 41
Type of Motion and Mechanisms
Translation to Translation
Most power sources that are readily available today are either of the pure rotational motion type, such as electric motor or hand crank, or of the pure translational type, such as pneumatic or hydraulic cylinder.
![Page 42: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/42.jpg)
Ken Youssefi UC Berkeley 42
Type of Motion and MechanismsRotational to Rotational
![Page 43: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/43.jpg)
Ken Youssefi UC Berkeley 43
Type of Motion and MechanismsRotation to Translation
![Page 44: Ken YoussefiUC Berkeley 1 Introduction to Mechanisms](https://reader035.vdocument.in/reader035/viewer/2022062408/56649e4c5503460f94b42266/html5/thumbnails/44.jpg)
Ken Youssefi UC Berkeley 44
References• Mechanism Design, Analysis and Synthesis by
Erdman and sander, fourth edition, Prentice-Hall, 2001,
• Machines and Mechanisms by Uicker, Pennock and Shigley, third edition, Oxford, 2002.
• Machines and Mechanisms by Myszka, Prentice-Hall, 1999