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• Compound 4 bar linkage design

Discussion in 'Calculations' started by Hadia, Jan 6, 2016.

1. HadiaMember

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So I have to design this linkage system.
How it works is, when the link 1 receiving torque from the gear system is blocked from moving, the link 2 transfers it's torque to the next 4 bar linkage via link 3. When link 4 is blocked, the same thing happens.

What is confusing me thought is how is the torque transferred from the first 4 bar linkage to the second?
In what ratio that is?
And if say, I had to compare this compound 4 bar linkage with another linkage system, what calculations do I base the comparison on? Force distribution analysis?
If yes, I need some confirmation of force distribution calculations I have been doing on this. Because I have no way of validating If I am going in the right direction.

Long story short.
I need help with the force distribution calculations along linkages with its free body diagram.
I need help with torque transfer mechanism in this linkage design.
And I need some sort of method for comparison (even a software resource would help)

Looking forward to a reply.

2.
3. s.weinbergWell-Known Member

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Posted this on LinkedIn, but not sure if you'll see it there, so reposting:

[COLOR=rgba(0, 0, 0, 0.701961)]In my 30 second look at the image, I can't really tell what the heck is going on, but it seems that what you are looking for is basically how a planetary gearing system works. The rotational speed, and torque, of the sun, carrier, and outer gear, are related. The planets too, but I don't think you need that here. You need to specify 2 to calculate the third. Fortunately for you, you are dealing with the simple case where one is fixed, so the calculations are simple.[/COLOR]
[COLOR=rgba(0, 0, 0, 0.701961)]The values in the table near the top of[/COLOR]http://science.howstuffworks.com/transport/engines-equipment/gear7.htm[COLOR=rgba(0, 0, 0, 0.701961)] should give you what you need. Remember, the gear ratio has inverse effect on the rotational speed vs the torque[/COLOR]

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