[SOLIDWORKS] Suspension (piston) stresses

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1

Hello 

I make a model of a tank and I tackle the suspension/track assembly. I isolated the subset to better understand the problem. 


 http://www.noelshack.com/2016-40-1475579586-capture4.jpg

Axis 1 is attached to the chassis and does not move, parts 2 and 2' rotate around this axis. When one (or both) of parts 2 and 2' rises, the piston composed of parts 3 and 4 compresses. 

The problem is that when I want to create a coaxial link between room 3 and 4 (highlighted in blue below) so that the 2 pieces slide, I get a beautiful error that blocks the whole system. I specify that the 2 pieces are well aligned at the start.
 


 http://image.noelshack.com/fichiers/2016/40/1475579586-capture3.jpg

The problem must be simple but I don't see what to do, anyone have an idea? 

(For those who want to see the rest of the model :http://image.noelshack.com/fichiers/2016/40/1475580683-capture.jpg )

2

Hello

Have you tried advanced slide constraints?

If not, are the two wheels free or fixed to the ground by a contact point?

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3

Hello

If you have a problem it's probably because you have one or more constraints that are in contradiction.

I'm under SW2015, can you post your assembly?

may the force be with you.

 

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4

Yes I tried the slide but it doesn't work, it just makes the two pieces parallel like this: 

And yes, both wheels are free.

5

What you can do is validate your constraint by forcing it and then make a diagnosis. The software will offer you several solutions to correct your problem.

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6

Is it possible to send it to us to test on our side? :o

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7

Here I uploaded it: https://www.mediafire.com/?x57f4dmsv3bhkcp

8

Damn, files are missing from the assembly :(

9

yes there is not everything

10

Yes I'm really sorry, normally it's good: https://www.mediafire.com/?x57f4DMSV3bhkcp

11

lay a construction line on the axis of your part 4= the length of your stroke

same for part 3 = to the length of your stroke

and make a coincidence of these 2 lines

you will hide these lines afterwards

try to play with it in your assembly

Are you sure you're good on the same level

To see your 2nd image I have a doubt

maybe it will be wise to create an interleaved piece between your 2 wheel flanges

@+ 

12

Hello

I am wary of flexible assemblies. Doc I took the " spring support" parts out of your assembly and I set my constraints and it works.

May the force be with you.

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13

yes @ Obi but as you see his assembly is in the bag

since the flasks are for you fussioned ;-)

so it wasn't aligned in top view ;-)

therefore it is necessary

if he wants to keep these pieces

make it an intermediary as I described in the previous post

@+

 

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14

@GT22

To tell the truth, when I saw the flexible assemblies, I didn't try to understand because as I said I don't like it or occasionally. So for me it's easier to take out the parts and put the constraints back in a more "traditional " assembly.

 May the force be with Brittany.

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15

Well done GT22. Indeed, it looks like the wheels are not aligned and as a result, the 2 and 2' parts are not either. This means that the piston is not likely to be coaxial with the cylinder body.

If MadMax06 had forced the coercion, the diagnosis would have told him that there was one coincidence too many;)

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16

Indeed the wheels are not aligned on the other hand the 2 parts of the piston/cylinder (as you want) are aligned. On the model I make, the wheels must be offset... If I had wanted to do the parallel wheels from the beginning, I would have done it^^ 

17

Indeed the wheels are not in the axis but that doesn't prevent where the cylinder is piston had are.

 


roue_2.jpg
18

Seen like this, it's clearer:)

The assembly may be over-constrained and the fact of adding yet another constraint does not please Solidworks (it must be said that this one is fussy).

Or there is a slight misalignment between the piston and the cylinder body. What does it look like with a measurement of the two axes?

19

And then it works or not?

edit: I've already measured and there is no offset and like pabove, the two axes overlap. I start the assembly from the beginning, without using subassembly we'll see what happens

20

To make it work 

1-In " Piston 2 " Removes Slide Stress " Width1 "

2-in " grp left suspension" removes the constraint " Coincident2 "

3-Poses a coaxial stress between the cylinder and the piston.

may the force be with you.


piston.wmv
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