<< Click to Display Table of Contents >> Navigation: Getting Started Tutorials - MechDesigner > Tutorial 14: Gear-Pairs / Rack-Pinions > A: Fixed Gear Centres > Simple Gear-Trains |
![]() Schematic of Simple Gear Train |
A Simple Gear Train is a number of Simple Gear-Pairs in series. Each shaft/axis has only one gear. Use a Simple Gear Train: •To increase the distance between the input and output shafts and still use small gears •To reverse the direction of the output shaft on a Simple Gear-Pair •To increase or decrease the Torque and Speed at the output-shaft. The image to the left shows a schematic of a Simple Gear Train. Note: 1.Only the gears on the input and output shafts change the speed ratio. All other change the rotational direction. 2.The gears not on the input and output shafts are called idle gears or idlers. |
Monobloc Machines Monobloc machines are frequently used with Filling, Capping, Labeling, Coding, Orientating and many other high speed packaging applications. The monobloc has a simple gear-train to transmit the motion from one 'head' to the next. See YouTube Video: http://youtu.be/fvRp2lC1aXw
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Do Add a Gear-Pair with Fixed-centers Edit the number-of-teeth as follows. Here, the number-of-teeth are: Z1=20 The Gear Ratio is Z1/Z2 = 2 Remember this basic rule: Three Parts, three Lines, joined together with Pin-Joints. Two Lines must be in Parts that are kinematically-defined. |
To add a Simple Gear-Train, we use the same basic rule, again, and again. We need three Parts each with a Line, a Line is joined with a Pin-Joint to the Start-Point and the end-Point of one Line. Gear-Pair 2: Before we start, we have a Line in a kinematically-defined Part. Line 1 / Part 1 : Line We need two more Parts and Lines. Line 2 / Part 2 : It is a new Line in the Base-Part. It will be the Line that joins the gear-centers 1.Edit the Base-Part 2.Part-Editor: Geometry toolbar > Add Line IMPORTANT rule: You must MERGE Point You can Hover + Drag to add Line 3.Part-Editor: Geometry toolbar > Merge-Points : Click Point 4.Click the graphic-area to complete the merge-points. 5.Close the Part-Editor |
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Line 3 and Part 3 : It is a new Part - it will be the Driven-Gear. 1.Mechanism-Editor: Kinematics-toolbar > Add Part: Drag to the Part 2.Mechanism-Editor : Kinematics-toolbar > Add Pin-Joint Join the start-Point of CAD-Line in Part The length the CAD-Line
We are ready to Add Gear-Pair |
1.Click Machine-elements toolbar > Add Gear-Pair 2.Click the elements, 3.Click |
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You can see the Gear-Pair 2
MechDesigner adds two new gears. A Simple Gear Train does not need one of the Gears of Gear-Pair 2. We must hide the Gear on the same shaft center. This is a MechDesigner trick. |
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Use the Gear-Pair dialog-box to edit: 1.Module = 3 2.Number-of-teeth Gear 1 = 40 : the same as Gear 2 of Gear-Pair 1 3.Number-of-teeth Gear 2 = 20 The image shows the Gear-Pair •You can see only 3 gears. •Gear 2 of Gear-Pair •You can do the same actions to add more Gear-Pairs. |