Fixed Pulley centers - Belt Driven by Driving-Pulley

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Fixed Pulley centers - Belt Driven by Driving-Pulley

Fixed Pulley Centers - a Belt driven by a Driving-Pulley

This design arrangement has one Driving-Pulley, one Driven-Pulley, and one sketch-path to represent the Belt.

A Driving-Pulley drives the Belt and also a Driven-Pulley.

Notes:

The sketch-path that represents the Belt can be an open or closed sketch-path. Typically, it is a closed sketch-path.

You can control the length of the belt with a Controlling-Dimension - see Control the Length of the Belt

Preparation: Sketch-Path and Pulley Parts

GST-17-1-Option1-BbyP-0

STEP 1: Add a closed sketch-path to represent the path of the belt.

1.Edit the Base-Part :

Add a sketch-path to represent the path of a BeltRed-14-1. In this example, the sketch-path has two Arcs and two Lines.

Click Add Dimension : Click each Arc Red-14-2. The radius of each Arc is not important.

Click Add Dimension Click the center-Points of the ArcsRed-14-3. The distance between the Arcs is not important

2.Exit the Part-Editor

STEP 2: Add a Line to the sketch

1.Edit the Base-Part

Click Add Line - drag in the graphics-area to add the LineRed-14-4.

Click Add Coincident Constraint : Click the start-Point of the Line and the center-point of an Arc.

Click Add Horizontal Constraint : Click the Line

Click Add Dimension : Click the Line

2.Exit the Part-Editor

STEP 3: Add a Motion-Path FB

1.Kinematic FB toolbar > Add Motion-Path FBRed-14-5

Click one of the sketch-elements in the sketch-path that represents the belt.

Click OK-tiny-13-17 in the Command-Manager

A Motion-PointRed-14-6 is at the start-Point of the sketch-element that you select.

The Motion-Point is difficult to see because it is coincident with the start-Point.

STEP 4: Add the Parts for the Pulley's

1.Add Part × 2: × Drag to add the two PartsRed-14-7. The length of each Part is not important.

2.Add Pin-JointRed-14-8: Click the start-Point of a PartRed-14-7 and the start-Point of the LineRed-14-4 .

3.Add Pin-JointRed-14-9: Click the start-Point of the other PartRed-14-7 and the center-Point of the other Arc.

4.Add Motion-Dimension FBRed-14-10a : Click the Pin-JointRed-14-8 ; Click the LineRed-14-4 ; Click the CAD-Line along the PartRed-14-7 , Click OK-tiny-13-17 in the Command-Manager.

One rotating-Part is kinematically-defined (it is a Rocker), the other rotating-Part is not kinematically-defined.

Add Motion-Path FB - Command-Manager

Add Motion-Path FB - Command-Manager
GST-17-1-Option1-BbyP-1
GST-17-1-Option1-BbyP-2

Use Add Pulley

GST-17-104

STEP 1: Add the Driving-Pulley

GST-Icon-AddPulley

1.Machine elements toolbar > Add Pulley

Add Pulley opens in the Command-Manager.

You must select four elements - see images Red-14-8Red-14-5Red-14-2Red-14-7 above

1.Click Pin-JointRed-14-8

2.Click Motion-Path FBRed-14-5

The Part-Editor opens to show the sketch-path of the Belt in the Base-Part

3.Click the radius DimensionRed-14-2 of the Arc sketch-element at the Pin-JointRed-14-8

The Part-Editor closes.

4.Click the PartRed-14-7 that has the Pin-JointRed-14-8

5.Click OK-tiny-11-15 to close the Command-Manager.

We add for you a Driving-Pulley

Notes

The Part that is kinematically-driven (a Rocker, in this case) is the Driving-PulleyRed-14-1.

Belt Speed = Radius of Driving-Pulley × Angular-Velocity of the Driving-Pulley

 
GST-17-1-Option1-BbyP-4
GST-17-1-Option1-BbyP-5

STEP 2: Add the Driven-Pulley

Do Step 1 again but select the other Pin-Joint, and the Part that is not kinematically-defined.

We add for you a Driven-PulleyRed-14-2

The default colors of a Driven-Pulley and a Driving-Pulley are different.

 
GST-17-107

STEP 3: Edit the Driving Pulley

1.Double-click a Pulley

The Pulley dialog is now open

2.Edit the Number-of-Teeth

3.Close the Pulley dialog

GST-17-108

STEP 4: Edit the Driven Pulley

1.Double-click a Pulley

The Pulley dialog is now open

2.Edit the Number-of-Teeth

3.Close the Pulley dialog .

 

Save your model - CTRL+S
tog_minusKinematics Tree Rocker and Pulley-Rocker

URL of this topic:
http://mechdesigner.support/index.htm?gst-17_2a-fixed-pulleys-driver-pulley-belt.htm