<< Click to Display Table of Contents >> Navigation: Getting Started Tutorials - MechDesigner > Tutorial 17: Belts and Pulleys > Option 1: Fixed Pulley Centres > Pulleys Driven By Belt |
This design arrangement is a little more unusual than the Belt driven by a Pulley.
Physically, the Belt is wrapped around freely rotating Pulleys. The Belt is driven by motion-values at the input-connector to the Motion-Path FB.
STEP 1: Add a sketch-loop to represent the path of the belt. a)Base-Part : Add a sketch-loop to represent the path of the Belt In this example, the sketch-loop has two Arcs and two Lines. b)Part-Editor:Add a Line c)Part-Editor: You MUST dimension each Arc d)Part-Editor (Optionally, but a good idea:): Dimension the distance between the Arcs and the length of the line The radius of each Arc is not important. |
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![]() Command-Manager: |
e)Exit the Part-Editor STEP 2: Add a Motion-Path FB a)Mechanism-Editor: Kinematic FB toolbar > Add Motion-Path FB b)Mechanism-Editor: Click the sketch-loop that represents the path of the belt. c)Click |
A Motion-Point shows at the start-Point of the sketch-element you select in the sketch-loop. It is a small triangle inside the Point symbol. STEP 3.Add a Linear-Motion FB a)Mechanism-Editor: Kinematic FB toolbar > Add Linear-Motion FB b)Mechanism-Editor: Click the graphic-area Connect the Linear-Motion FB Motion-values at the output of the Linear-Motion FB are 0-360 . Because the Data-Type are Rotary, 0-360 moves the Motion-Point the total length of the sketch-loop. |
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STEP 4.Add Parts The length of each Part is not important for the Pulley or belt. STEP 5.Add a Pin-Joint The Pin-Joint will be at the center of the Pulley. |
STEP 1: Add the Pulleys a)Mechanism-Editor: Machine elements toolbar > Add Pulley Add Pulley opens in the Command-Manager. Click, in the graphic-area, the four(4) elements from top to bottom - see images
The Part-Editor opens to show the sketch-loop to which you added the Motion-Path FB.
The Part-Editor closes.
b)Click Do a) and b) again for the two Pulleys. |
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![]() Command-Manager |
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![]() Two Pulleys Driven by the Belt' |
Notes: Driven-Pulleys. The angular-velocity of each Pulley is defined by the linear-speed of the Motion-Point along the sketch-loop (Belt) and the radius of each Pulley. •When you add a Pulley, the radius of the Arc in the sketch-loop will change to give an integer number-of-teeth on the Pulley. •Driven-Pulleys are Purple •Edit the number-of-teeth with the Pulley dialog. •Edit the Tooth-Pitch in the Motion-Path FB. |
![]() Kinematics-Tree - Pulley |
The two Driven Rockers are in the Kinematics-Tree as a Pulley-Rockers |