Kevin Johnson

Tuomo, I post in many, many forums. Don't forget your homework assignments.

Kevin Johnson

http://en.wikipedia.org/wiki/Gear_pump

You have to actually READ the article. Look at the very last picture as well.

I accept your apology.

ptuomov

Your accountant and business partner(s) should stage an intervention and take away your internet access. For multiple reasons.

Kevin Johnson

The county just staged an intervention with my yard. I had to dispose of four vehicles. Two left this morning. Oh well. When I moved from California I had to dispose of 19 vehicles.

ptuomov

If I am wrong, I will be the first to admit it.

It is my understanding that the definition of a generated rotor pump requires that the outer gear has one more tooth than the inner gear. The pictures in the page that you link to are gerotor pumps and they have N inner gear teeth and N+1 outer gear teeth.

The Porsche 928 oil pumps have 9 inner theeth and 11 outer teeth. Therfore, they are not gerotor pumps.

If I have misunderstood the definition and history of generated rotor / gerotor pumps, and someone presents credible evidence of it, retraction and apology will be coming. I wouldn't hold my breath, though, givent hat this is the wikipedia definition of a gerotor pump:

http://en.wikipedia.org/wiki/Gerotor

"A gerotor is a positive displacement pumping unit. The name gerotor is derived from "Generated Rotor". A gerotor unit consists of an inner and outer rotor. The inner rotor has N teeth, and the outer rotor has N+1 teeth. "

Bill Ball

The Porsche pump is an internal gear pump but not a Gerotor. Gerotors are a subset of internal gear pumps. They are missing the crescent and always have 1 more tooth on the outside gear.

http://www.vianenterprises.com/Gerotor.htm
http://www.pumpschool.com/principles/gerotor.htm
http://www.vianenterprises.com/principle.htm

Carry on....

Kevin Johnson

No, the Porsche pump is an internal-external gear pump. Look at patents 3204564 (Daimler Benz) and 3785756 (GM).

And Wikipedia has listed an example where the definition of a gerotor has been updated to N+1 minimum.

Perhaps these pumps are members of the set of gerotor pumps that are not gerotor pumps. Or perhaps members of the set of internal gear pumps that are not internal gear pumps.

This warrants careful investigation. Or perhaps this was a red herring being fed to a black swan?

ptuomov

The bigger issue here is that you are frequently wrong because you frequently make up stuff and never admit to being wrong when you get caught making up stuff, which also happens frequently.

The definition of a gerotor pump includes that for a pump to be a gerotor pump it must have one and only one more tooth in the outer gear. Porsche 928 pumps have two more teeth in the outer gear than in the inner gear and are therefore not gerotor pumps. You claimed to have investigated and measured a Porsche 928 gerotor pump. Either you measured an actual pump but didn't know what a gerotor pump is or you just made up the whole thing. Which one is it?

Bill Ball

Whatever. Believe what you want. Wikipedia is always right. I hope you guys are getting something out of this. I should stay out of the way.

ptuomov

In case anyone wants to get any more insults in, I am going to close this thread soon.

Kevin Johnson

Yes, wikipedia shows a gerotor with N+2. It's an update to the knowledge base. Just like Daimler Benz and GM updated the previous terminology and were themselves updated.

Aren't definitions and set theory fun?

Rick Carter

I fart in your general direction. Your mother was a hamster and your father smelled of elderberries!

ptuomov

Perfect conclusion to the thread. Thanks. Closing the shop.