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 1 Outline 2016/3/24 § Introduction § Motivation § Example § Application § Conclusions 2 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) 2016/3/24 3 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) 2016/3/24 4 工程科技研究所 副教授 蔡錦山 Variable stroke engine Picture source : Autocar Handbook, Ninth edition 2016/3/24 5 工程科技研究所 副教授 蔡錦山 Motivation @ 2016/3/24 (1/2) Crank-Rocker Mechanism: Kinematics 6 工程科技研究所 副教授 蔡錦山 Motivation @ (2/2) Crank-Rocker Mechanism: CAD Press the picture to animate the motion of the Crank-Rocker Mechanism. 2016/3/24 7 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. 2016/3/24 8 工程科技研究所 副教授 蔡錦山 Application @ 2016/3/24 (1/4) A Double Chebyshev's Linkage Mechanism: Design 9 工程科技研究所 副教授 蔡錦山 Application @ 2016/3/24 (2/4) A Double Chebyshev's Linkage Mechanism: Simulation 10 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. 2016/3/24 11 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. 2016/3/24 12 工程科技研究所 副教授 蔡錦山 Conclusions @ CAD (Computer Aided Design) compared with Kinematics of Machines for the linkage mechanism design is @ 2016/3/24 Simpler More Convenient More Flexible More Economic More Efficient More Creative 13 工程科技研究所 副教授 蔡錦山 謝謝聆聽 敬請指導 2016/3/24 工程科技研究所 副教授 蔡錦山 14 A Belt-Driven Camshaft 2016/3/24 15 Introduction • Creating cams using curved slots • Using gears to simulate a belt drive mechanism • Using rulers to draw precise shapes 2016/3/24 16 Setting Up the Workspace 2016/3/24 (1/3) 17 Preferences dialog 2016/3/24 18 Setting Up the Workspace 2016/3/24 (2/3) 19 Numbers and Units dialog 2016/3/24 (1/2) 20 Numbers and Units dialog 2016/3/24 (2/2) 21 Setting Up the Workspace 2016/3/24 (3/3) 22 Workspace dialog 2016/3/24 23 Empty workspace The x-axis Grid lines The y-axis Rulers 2016/3/24 24 Grid Snap should be activated 2016/3/24 25 View Size dialog 2016/3/24 (1/2) 26 View Size dialog (2/2) automatically computes the other 2016/3/24 27 Drawing the Disk directly 2016/3/24 28 Attaching the Disk to the Background These fields show the coordinates of the other point of the pin joint. 2016/3/24 29 Drawing the Curved Slot 2016/3/24 30 Changing the Shape of the Curved Slot 2016/3/24 (1/10) 31 Changing the Shape of the Curved Slot 2016/3/24 (2/10) 32 Changing the Shape of the Curved Slot 2016/3/24 (3/10) 33 Changing the Shape of the Curved Slot 2016/3/24 (4/10) 34 Changing the Shape of the Curved Slot 2016/3/24 (5/10) 35 Changing the Shape of the Curved Slot 2016/3/24 (6/10) 36 Changing the Shape of the Curved Slot 2016/3/24 (7/10) 37 Changing the Shape of the Curved Slot 2016/3/24 (8/10) 38 Changing the Shape of the Curved Slot 2016/3/24 (9/10) 39 Changing the Shape of the Curved Slot 2016/3/24 (10/10) 40 Numerically reshaped cam 2016/3/24 41 Creating Cam Followers 2016/3/24 (1/2) 42 Creating Cam Followers 2016/3/24 (2/2) 43 Choose the Horizontal Keyed Slot tool and click one of the cam followers 2016/3/24 44 Choose the Horizontal Keyed Slot tool and click the other of the cam followers 2016/3/24 45 Two cam followers with keyed slot joints 2016/3/24 46 The snap point 2016/3/24 47 Snap point near the right end of the left cam follower 2016/3/24 48 Snap point near the left end of the right cam follower 2016/3/24 49 Duplicating a curved slot 2016/3/24 (1/2) 50 Duplicating a curved slot 2016/3/24 (2/2) 51 Select the original curved slot and choose Appearance from the Window menu 2016/3/24 52 Enter “Left Follower Slot” in the name field of the Appearance window Left Follower Slot 2016/3/24 53 Select the duplicated curved slot and enter “Right Follower Slot” in the name field of the Appearance window Right Follower Slot 2016/3/24 54 Verify the FOR coordinates for the Left Follower Slot (1/2) 2016/3/24 55 Verify the FOR coordinates for the Left Follower Slot (2/2) 2016/3/24 56 Verify the FOR coordinates for the Right Follower Slot (1/2) 2016/3/24 57 Verify the FOR coordinates for the Right Follower Slot (2/2) 2016/3/24 58 Attaching the Cam Followers to the Slots (1/4) Shift + the point 2016/3/24 59 Attaching the Cam Followers to the Slots (2/4) 2016/3/24 60 Attaching the Cam Followers to the Slots (3/4) Shift + the point 2016/3/24 61 Attaching the Cam Followers to the Slots (4/4) 2016/3/24 62 Dragging the cam disk 2016/3/24 63 To restore the initial conditions 2016/3/24 64 Creating the Drive Disk 2016/3/24 65 Click the center snap point of the drive disk to attach the motor 2016/3/24 66 Properties window for a motor 2016/3/24 67 Selecting the gear constraint 2016/3/24 68 Properties window for gears 2016/3/24 69 Choose Accuracy from the World menu 2016/3/24 70 Simulation Accuracy dialog 2016/3/24 71 Choose Time from the Measure menu Press the picture to animate the motion of the Belt-Driven Camshaft. 2016/3/24 72 HW#5-A Belt-Driven Camshaft (1/2) Driving Disk Cam Follower 2016/3/24 73 HW#5-A Belt-Driven Camshaft 2016/3/24 (2/2) 74