topic Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM in Inventor Forum

PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

Anonymous — Sat, 02 May 2020 15:12:28 GMT

Hello All,

Hope all is well. Can someone be kind enough to help me find out the reason(s) as to why the piston and crankshaft underweight keep clashing on each other? There's one piston that's okay but the rest aren't right! I've applied flexibility to the piston and connecting rod assembly but it's still not working. I've been staring and working on it for days now and it's cracking me up lol. Please help!

I've attached the assembly.

Thanks so much!

Regards,

Ellen

Re: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

JDMather — Sat, 02 May 2020 16:57:51 GMT

Many part sketches are not fully defined.

The Sketch2 in Bearing Holder and Bearing Stand are particularly suspect.

Can you post the drawings that you used to model those two parts?

I'll wager that the dimensions on the drawings were much neater (and more logical) that your sketches.

I have the assembly working - but I think it would be best if you fix these up.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

WHolzwarth — Sat, 02 May 2020 20:13:02 GMT

Here's a new set (2020).

I've deleted some duplicate parts, made some more sub-assys, and re-worked the constraints.

Re: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

Anonymous — Sun, 03 May 2020 15:22:21 GMT

Hello JDMather,

Here are the drawings of piston and crankshaft counterweight. Thank you so much!

Best regards,

Ellen

Re: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

JDMather — Sun, 03 May 2020 15:41:57 GMT

Those are not the two files that I referred to.

You had the center height set differently on the two supports.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

Anonymous — Mon, 25 May 2020 12:05:19 GMT

Hello Betreff,

Thank you for taking the time to do a new set of the engine. It seems like there are some problem with the constraints and the pistons are clashing with the cylinder? Please see the attached screenshot.

Thank you!

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

WHolzwarth — Sun, 03 May 2020 16:51:05 GMT

Works ok here, even with the difference in axis height, that Jeffrey mentioned.

Did you install all updates?

Attached are two new files, that are fixing the height difference. Replace them in my set, and try again.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

JDMather — Sun, 03 May 2020 21:29:41 GMT

Walter,

I will make a video tomorrow, but I think there is something missing here that the mechanism cannot function as-is.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

WHolzwarth — Sun, 03 May 2020 22:16:22 GMT

Looks good here with my settings, Jeffrey. See video.

Enough for today. We'll see.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

Anonymous — Mon, 25 May 2020 12:06:26 GMT

Hello Walter (sorry for calling you betreff lol),

I've tried opening your file and there are error messages. I've downloaded the two files you've attached and replaced the old ones but it is still giving me the same error messages unfortunately. I've been looking at the video you've sent and it does work! I've tried applying constraints to the connecting rod hub and the stand and it seems working if i'll drive it manually. But if I simulate it, it doesn't work. How did you apply angle constraints to the connecting rod hub and the bearing stand? I've been working on this for two days now lol.

Thanks!

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

JDMather — Tue, 05 May 2020 14:38:04 GMT

@wh wrote:

Looks good here with my settings, Jeffrey. See video.

Enough for today. We'll see.

How did you constrain to keep the timing correct?

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

WHolzwarth — Tue, 05 May 2020 15:35:24 GMT

Jeffrey, for testing suppress Winkel:2 (Angle:2) in Relationships of my top-level assembly, and see the difference. In the beginning I set +/- 18° limits for this angle, but it can be set to 0°, too. The angle is a constraint versus the base.

Ellen: Without seeing your files, I don't know, what's wrong.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

Anonymous — Tue, 05 May 2020 16:45:49 GMT

Hi Walter,

Sorry about that. Here's the assembly file. I am still trying to figure out why your assembly is displaying error update. I really want to study your constraints.

Thanks.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

WHolzwarth — Tue, 05 May 2020 17:15:49 GMT

Ellen, this is your fileset, not mine.

I need your files based on my set, for checking any issues, that you have with them.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

Anonymous — Tue, 05 May 2020 18:48:49 GMT

Hi Walter,

Sorry for the confusion. Here's your file set. I've updated the 2 files (Base and Bearing Stand) with the latest that you've uploaded. Thanks again for your help.

Ellen

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

WHolzwarth — Tue, 05 May 2020 20:13:33 GMT

Works as before here, Ellen. No issue.

But I've noticed, that you seem to be on Inventor 2020 Build 168. I'm on 2020.3 Bild 373.

Perhaps updating will solve the problem.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

Anonymous — Thu, 07 May 2020 16:23:31 GMT

Hi Walter,

I've updated my Inventor but it is still displaying the same error message 😭 Not sure what's going on.

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

WHolzwarth — Thu, 07 May 2020 16:53:15 GMT

@Anonymous schrieb:

I've updated my Inventor but it is still displaying the same error message 😭 Not sure what's going on.

🤔 Me too, Ellen. Does anyone else see similar behavior witn my fileset?

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

SBix26 — Thu, 07 May 2020 19:32:11 GMT

Also 2020.3, and I see no error messages upon opening the top level assembly.

Sam B
Inventor Pro 2021.0.1 | Windows 10 Home 1903
LinkedIn

Betreff: PISTON AND CRANKSHAFT INTERFERENCE PROBLEM

Anonymous — Thu, 07 May 2020 22:33:43 GMT

Hi Walter,

How do I know which version I have? Just want to make sure I've updated mine correctly.

Thanks!