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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
112/04/21112/04/21 工程科技研究所 副教授 蔡錦山工程科技研究所 副教授 蔡錦山 11
報告人：工程科技研究所 副教授 蔡錦山
A Study on the Linkage Mechanisms
Outline
2
Introduction§
Motivation§
Example§
Application§
112/04/21 工程科技研究所 副教授 蔡錦山
Conclusions§
Introduction
3112/04/21 工程科技研究所 副教授 蔡錦山
Data source : http://en.wikipedia.org/wiki/Linkage_(mechanical)
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.
Linkage Mechanism
4112/04/21 工程科技研究所 副教授 蔡錦山
Data source : http://www.freepatentsonline.com/3680881.html://en.wikipedia.org/wiki/Linkage_(mechanical)
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.
Variable stroke engine
5112/04/21 工程科技研究所 副教授 蔡錦山
Picture source : Autocar Handbook, Ninth edition
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Motivation (1/2)
Crank-Rocker Mechanism: Kinematics@
112/04/21 工程科技研究所 副教授 蔡錦山
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Motivation (2/2)
112/04/21 工程科技研究所 副教授 蔡錦山
Crank-Rocker Mechanism: CAD@
Press the picture to animate the motion of the Crank-Rocker Mechanism.
Example: A Belt-Driven Camshaft
8112/04/21 工程科技研究所 副教授 蔡錦山
Press the picture to show that how to complete the Belt-Driven Camshaft.
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Application (1/4)
A Double Chebyshev's Linkage Mechanism: Design@
112/04/21 工程科技研究所 副教授 蔡錦山
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Application (2/4)
112/04/21 工程科技研究所 副教授 蔡錦山
A Double Chebyshev's Linkage Mechanism: Simulation@
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Application (3/4)
A Double Chebyshev's Linkage Mechanism: CAD@
112/04/21 工程科技研究所 副教授 蔡錦山
Press the picture to animate the motion of the Double Chebyshev's Linkage Mechanism.
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Application (4/4)
112/04/21 工程科技研究所 副教授 蔡錦山
A Double Chebyshev's Linkage Mechanism: Product@
Press the picture to see the motion of the Double Chebyshev's Linkage Mechanism.
13
Conclusions
CAD (Computer Aided Design) compared
with Kinematics of Machines for the linkage
mechanism design is
@
112/04/21 工程科技研究所 副教授 蔡錦山
Simpler More Convenient More Flexible More Economic More Efficient More Creative
@
112/04/21112/04/21 工程科技研究所 副教授 蔡錦山工程科技研究所 副教授 蔡錦山 1414
敬請指導敬請指導謝謝聆聽謝謝聆聽
A Belt-Driven Camshaft
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Introduction
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• Creating cams using curved slots
• Using gears to simulate a belt drive mechanism
• Using rulers to draw precise shapes
Setting Up the Workspace (1/3)
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Preferences dialog
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Setting Up the Workspace (2/3)
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Numbers and Units dialog (1/2)
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Numbers and Units dialog (2/2)
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Setting Up the Workspace (3/3)
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Workspace dialog
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Empty workspace
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The y-axis
The x-axis
Grid lines
Rulers
Grid Snap should be activated
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View Size dialog (1/2)
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View Size dialog (2/2)
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automatically computes the other
Drawing the Disk directly
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Attaching the Disk to the Background
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These fields show the coordinates of the other point of the pin joint.
Drawing the Curved Slot
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Changing the Shape of the Curved Slot (1/10)
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Changing the Shape of the Curved Slot (2/10)
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Changing the Shape of the Curved Slot (3/10)
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Changing the Shape of the Curved Slot (4/10)
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Changing the Shape of the Curved Slot (5/10)
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Changing the Shape of the Curved Slot (6/10)
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Changing the Shape of the Curved Slot (7/10)
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Changing the Shape of the Curved Slot (8/10)
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Changing the Shape of the Curved Slot (9/10)
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Changing the Shape of the Curved Slot (10/10)
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Numerically reshaped cam
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Creating Cam Followers (1/2)
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Creating Cam Followers (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 (1/2)
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Duplicating a curved slot (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
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Left Follower Slot
Select the duplicated curved slot and enter “Right Follower Slot” in the name field of the Appearance window
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Right Follower Slot
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)
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Shift + the point
Attaching the Cam Followers to the Slots (2/4)
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Attaching the Cam Followers to the Slots (3/4)
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Shift + the point
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
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Press the picture to animate the motion of the Belt-Driven Camshaft.
HW#5-A Belt-Driven Camshaft (1/2)
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Cam Follower
Driving Disk
HW#5-A Belt-Driven Camshaft (2/2)
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