Simple Gear Trains

Schematic of Simple Gear Train

Schematic of Simple Gear Train

A Simple Gear Train is a number of Simple Gear-Pairs in series. Each Shaft 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

The image to the left shows a Schematic of a Simple Gear Train.

Note:

1.Gears between the input and output gears do not change the speed ratio. They only change the direction.
2.We call gears between input and output shafts idle gears or idlers.

Monobloc-scematic

MONOBLOC

This is a schematic of a 'Monobloc' machine, typical of Filling, Capping, Labelling, Coding, Orientating and many other high speed packaging applications.

It uses a Simple Gear Train to transmit the motion from one 'head' to the next.

See Also: the YouTube Video: http://youtu.be/fvRp2lC1aXw

See Also: Simple Gear-Pair, Compound Gear-Trains, Planetary Gear-Trains

Simple Gear Train: Stage 1

QST14-3-1

Start with a Simple Gear-Pair with an External Mesh - see Option 1 Step 14.1

Here, the number-of-teeth are:

T1=201s-red, T2=402s. The Gear Ratio is T1/T2 = 2


Use the rule:

'Three Parts, with three Lines, joined together with two Pin-Joints'.

Prepare Simple Gear Train: Stage 2

QST14-3-2A

Again, we need three Lines, in separate Parts. The Parts must be joined with Pin-Joints. The Pin-Joints must use the Points at the end of each Line.


Stage 2: Line 1 and Part 1

The Part that we need for Gear 1 of the Stage 2 is the Output Shaft the first Gear-Pair.

We do not need to add Line 1 in Part 1 because we can use Part2s .

QST14-3-2

Stage 2: Line 2 and Part 2

'Line-of-centres'.

It is in the Base-Part.

1.Edit the Base-Part3s

 

QST14-3-3

2.Add a Line1s-red

It does not matter how long

3.Use Merge-Points to merge the Point 2s and a Point 3s at the end of the new Line1s-red
4.Close the Part-Editor

QST14-3-4

Line 3 and Part 3

5.Add and Join a Part4s to the end of the new Line, with a Pin-Joint.

The length of Part4s is not important.

Add Simple Gear Train: Stage 2

CM-AddGearPair-clear-tags

Element 4 is the Dimension of Line 3

Element 4 is the Dimension of Line 3

Add Stage 2 Gear-Pair:

1.Add Gear-Pair
2.Click the four elements, in sequence

QST14-3-7

You can see the Stage 2 Gear-Pair2s

 

MechDesigner adds two gears.

For a Simple Gear Train, we do not need one of the Gears in the Stage 2 Gear-Pair.

We must hide the Gear on the same shaft centre.

This is a MechDesigner trick.

QST14-4-1

Use the Gear-Pair dialog-box to edit:

1.Module to 3
2.Number-of-teeth on Gear 1 of Stage 2 Gear-Pair to 40 – the same as Gear 2 of Gear-Pair Stage 1
3.Number-of-teeth on Gear 2 of Stage 2 Gear-Pair to 20

 

The image shows the Gear-Pairs Stage 1 and Stage 2: Gear-Pair 1s-red, Gear-Pair 2s

Gear 1 of Gear-Pair 2 is hidden. It is hidden by Gear 2 of Gear-Pair 1

Prepare and Add a Simple Gear Train: Stage 3

CM-AddGearPair-clear-tags

Preparation of model before we add the second Gear-Pair

Preparation of model before we add the second Gear-Pair

Preparation of Model to add the Third Gear-Pair.

1.Edit the Base-Part, Add a Line - Merge it with the end of the Line used for Gear-Pair Stage 2, Close the Part-Editor
2.Add Gear-Pair
3.Click the four elements, in sequence

QST14-4-4

You can see the new Gear-Pair, 1s-red, Stage 3

 

The default module of the Gear-Pair Stage 3 is different to the Gear-Pairs of Stage 1 and 2.

QST14-4-5

To 'hide' the Gear we do not want to see, use the Gear-Pair dialog to edit the:

1.Module to 3
2.Number-of-teeth on Gear 1 of Gear-Pair 3 to 20 - the same as Gear 2 of the Gear-Pair Stage 2

Also, edit:

3.Number-of-teeth on Gear 2 of Gear-Pair 3 to 40

 

The image shows the Three Gear-Pairs: Gear-Pair 1s-red, Gear-Pair 2s, and Gear-Pair 3s

Gear 1 of Gear-Pair 2 is hidden. It is hidden by Gear 2 of Gear-Pair 1
Gear 1 of Gear-Pair 3 is hidden. It is hidden by Gear 2 of Gear-Pair 2

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd