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XDN14-Alexandrite
14-Alexandrite
July 21, 2022
Question

Universal Joint analysis in MDO

  • July 21, 2022
  • 1 reply
  • 1821 views

Hello

I try to analysis universal joint (Cardan's joint) in MDO

the mechanism is composed with 2 universal joint, i have a slide between U joint.

on enter shaft, i use a speed servomotor

on exit shat, i use a torque servomoteur

It'OK,  a speed and torque values are consistent

 

But, for design the bearing betwenn cross and fork, i need to calculate the forces on cross

of course, this force is torque/ fork radius (tangential force)

I would like to find this result with the Creo's measures, but i can't do it!
131143.png

 

 
 

 

1 reply

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XDN14-AlexandriteAuthor
14-Alexandrite
July 21, 2022

in pivot link (red circle) link betwen fork and cross

Creo fin a right torque value, if i ask a radial torque of this link.

logically, if i ask a radial force of this link ( axial is not possible with my link) he has to give me 3600N approximately.

But it's wrong! Creo return 0.05N

someone has an idea??
132415.png

 

For this step, i don't use external load

 

 

 

and he give me

X
XDN14-AlexandriteAuthor
14-Alexandrite
July 21, 2022

I don't find my error !!

now, i create a simplified model.

I use 1 universal joint

red arrow = servomotor constant speed

green arrow = servomotor constant torque

 

when i run simulation i find speed and torque oscillate. of course it's OK because this joint are not

homokinetics in single use.
 
now my problem, i want to calculate tangentiel load on yellow cross (for design ball bearing for yellow cross)
the only way i find is to create a personnal measure.
first : Creo calculate a radial torque
second, my measure divides the radial torque with radius of application point
 
i don't understand how to use Creo for calculate this with reaction restriction....
 
175417.png

 

175857.png

 

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