南榮技術學院101學年度第二學期教師教學媒體觀摩及數位教材製作
A Study on the Linkage Mechanisms
報告人：工程科技研究所 副教授
蔡錦山
2016/3/24
工程科技研究所 副教授 蔡錦山
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Outline
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Introduction
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Motivation
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Example
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Application
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Conclusions
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工程科技研究所 副教授 蔡錦山
Introduction
A mechanical linkage is an assembly of bodies
connected to manage forces and movement. The
movement of a body, or link, is studied using
geometry so the link is considered to be rigid. The
connections between links are modeled as
providing ideal movement, pure rotation or sliding
for example, and are called joints.
Data source : http://en.wikipedia.org/wiki/Linkage_(mechanical)
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工程科技研究所 副教授 蔡錦山
Linkage Mechanism
A linkage mechanism coupling a supporting
structure and a moveable member for insuring
relative linear motion of the moveable member. A
controlled arm and a radial lever are so coupled
along a center line to the supporting structure and
each other that a controlled arm end is restricted to
substantially linear motion only for a
predetermined segment of its path.
Data source :
http://www.freepatentsonline.com/3680881.html://en.wikipedia.org/wiki/Linkage_(mec
hanical)
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工程科技研究所 副教授 蔡錦山
Variable stroke engine
Picture source : Autocar Handbook, Ninth edition
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工程科技研究所 副教授 蔡錦山
Motivation
@
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(1/2)
Crank-Rocker Mechanism: Kinematics
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工程科技研究所 副教授 蔡錦山
Motivation
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(2/2)
Crank-Rocker Mechanism: CAD
Press the picture to animate the motion
of the Crank-Rocker Mechanism.
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工程科技研究所 副教授 蔡錦山
Example: A Belt-Driven Camshaft
Press the picture to show that how to
complete the Belt-Driven Camshaft.
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工程科技研究所 副教授 蔡錦山
Application
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(1/4)
A Double Chebyshev's Linkage Mechanism: Design
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工程科技研究所 副教授 蔡錦山
Application
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(2/4)
A Double Chebyshev's Linkage Mechanism: Simulation
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工程科技研究所 副教授 蔡錦山
Application
@
(3/4)
A Double Chebyshev's Linkage Mechanism: CAD
Press the picture to animate the
motion of the Double Chebyshev's
Linkage Mechanism.
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工程科技研究所 副教授 蔡錦山
Application
@
(4/4)
A Double Chebyshev's Linkage Mechanism: Product
Press the picture to see the motion of the
Double Chebyshev's Linkage Mechanism.
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工程科技研究所 副教授 蔡錦山
Conclusions
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CAD (Computer Aided Design) compared
with Kinematics of Machines for the linkage
mechanism design is
@
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





Simpler
More Convenient
More Flexible
More Economic
More Efficient
More Creative
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工程科技研究所 副教授 蔡錦山
謝謝聆聽
敬請指導
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工程科技研究所 副教授 蔡錦山
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A Belt-Driven Camshaft
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Introduction
• Creating cams using curved slots
• Using gears to simulate a belt drive mechanism
• Using rulers to draw precise shapes
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Setting Up the Workspace
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(1/3)
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Preferences dialog
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Setting Up the Workspace
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(2/3)
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Numbers and Units dialog
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(1/2)
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Numbers and Units dialog
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(2/2)
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Setting Up the Workspace
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(3/3)
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Workspace dialog
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Empty workspace
The x-axis
Grid lines
The y-axis
Rulers
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Grid Snap should be activated
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View Size dialog
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(1/2)
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View Size dialog
(2/2)
automatically computes the other
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Drawing the Disk directly
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Attaching the Disk to the Background
These fields show the coordinates
of the other point of the pin joint.
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Drawing the Curved Slot
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Changing the Shape of the Curved Slot
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(1/10)
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Changing the Shape of the Curved Slot
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(2/10)
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Changing the Shape of the Curved Slot
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(3/10)
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Changing the Shape of the Curved Slot
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(4/10)
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Changing the Shape of the Curved Slot
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(5/10)
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Changing the Shape of the Curved Slot
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(6/10)
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Changing the Shape of the Curved Slot
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(7/10)
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Changing the Shape of the Curved Slot
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(8/10)
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Changing the Shape of the Curved Slot
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(9/10)
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Changing the Shape of the Curved Slot
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(10/10)
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Numerically reshaped cam
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Creating Cam Followers
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(1/2)
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Creating Cam Followers
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(2/2)
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Choose the Horizontal Keyed Slot tool
and click one of the cam followers
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Choose the Horizontal Keyed Slot tool
and click the other of the cam followers
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Two cam followers with keyed slot joints
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The snap point
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Snap point near the right end
of the left cam follower
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Snap point near the left end
of the right cam follower
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Duplicating a curved slot
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(1/2)
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Duplicating a curved slot
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(2/2)
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Select the original curved slot and choose
Appearance from the Window menu
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Enter “Left Follower Slot” in the name field
of the Appearance window
Left Follower Slot
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Select the duplicated curved slot and enter “Right Follower
Slot” in the name field of the Appearance window
Right Follower Slot
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Verify the FOR coordinates
for the Left Follower Slot
(1/2)
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Verify the FOR coordinates
for the Left Follower Slot
(2/2)
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Verify the FOR coordinates
for the Right Follower Slot
(1/2)
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Verify the FOR coordinates
for the Right Follower Slot
(2/2)
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Attaching the Cam Followers to the Slots (1/4)
Shift + the point
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Attaching the Cam Followers to the Slots (2/4)
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Attaching the Cam Followers to the Slots (3/4)
Shift + the point
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Attaching the Cam Followers to the Slots (4/4)
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Dragging the cam disk
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To restore the initial conditions
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Creating the Drive Disk
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Click the center snap point of the
drive disk to attach the motor
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Properties window for a motor
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Selecting the gear constraint
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Properties window for gears
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Choose Accuracy from the World menu
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Simulation Accuracy dialog
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Choose Time from the Measure menu
Press the picture to animate the
motion of the Belt-Driven Camshaft.
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HW#5-A Belt-Driven Camshaft
(1/2)
Driving Disk
Cam Follower
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HW#5-A Belt-Driven Camshaft
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(2/2)
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