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

We will use the model we have done in the previous Step LAdd a Gear-Pair with Fixed-centers

Edit the number-of-teeth as follows.

Here, the number-of-teeth are:

Z1=20, Z2=40.  

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.

PREPARATION

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 each end of one Line.

Gear-Pair 2:

Before we start, we have a Line in a kinematically-defined Part.

Line 1 / Part 1 : Line is the CAD-Line in the Driven-Gear of Gear-Pair 1.

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 AND Add Dimension  (the actual length is not important).

IMPORTANT rule: You must MERGE Point and Point

You can Hover + Drag to add Line  from Point OR

3.Part-Editor: Geometry toolbar > Merge-Points : Click Point and then click Point

4.Click the graphic-area to complete the merge-points.

5.Close the Part-Editor

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 to the end of Line, with a Pin-Joint.

The length the CAD-Line along Part is not important.

We are ready to Add Gear-Pair

ADD GEAR-PAIR 2

Add Gear-Pair 2

1.Click Machine-elements toolbar > Add Gear-Pair  

2.Click the elements, from top to bottom - refer to Preparation images, above

3.Click  at the bottom of the Command-Manager.

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.

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 and Gear-Pair

•You can see only 3 gears.

•Gear 2 of Gear-Pair is hidden by Gear 1 of Gear-Pair

•You can do the same actions to add more Gear-Pairs.