Cam and valve inventor studio simulation

[lis_wang]

I want to use Inventor studio to create the cam valve simulation (not dynamic simulation). I create a adaptive spring and then used contact set and tangent cnstrain method. But both method fail. I attached file here. Please help me to create simulation using studio. Thanks

[lis_wang]

The cam profile is reproduced from a 4 stroke engine's cam shaft. I am not very sure if it is a straight line but it looks like a straight line so I just model it as a straight line. If you said the reason is because of no enough contact area. Please look at the file attached here. The contact area is bigger enough to make sure to keep cam and follower contacting.

[JDMather]

I would put a dial indicator on the cam and rotate it recording readings to reverse engineer.

Measure the diameter of the shaft.

Create a paper tape the length of the circumference with 360° (or a more manageable number like 120 divisions) across the

length.

Wrap and tape around the shaft.

Have one student turn the shaft by increments while another records the dial indicator readings.

[lis_wang]

Could you please attach the file here? I do not understand what did you mean.

[JDMather · Accepted solution]

A straight edge against the cam shows a slight curvature where it appeared by eye to be a straight line.

It turns out the paper tape with divisions wasn't needed since the gear teeth could be used.

I didn't have any v-blocks handy, so we set up in the crankcase housing.

Then recorded displacement readings ever turn of a tooth against our index mark.

Next week I will post our analysis results.

After generating a displacement chart we designed a cam.

[lis_wang]

Mine is similar to yours. Thanks