Gear question for those of you mechanically inclined.

[Andrew1990]

Ok, I am designing a raised gear ratio so my first gear will spin at 100rpm and the final gear will spin at 400rpm operating a gear with a spinning rod on it.

What I want to do is operate a piston with a single directional gear.




How would I go about going from the gear to operate the piston?

 

[theflyingpig]

What you ask, is impossible.

 

[Eli]

I don't really understand the question.

 

[Andrew1990]

Let me do a quick drawing of what Im doing.

 

[Eli]

Re-read it a few times.

So the final gear will have a rod on it that spins around as the gear is turned. You want this to operate a piston?

So you need a connecting rod?

 

[boomerang]

Create a pivot point eccentric to the center of the gear. The rotation of the gear will result in a reciprocating motion of the piston. You'll need a means to connect the piston to the pivot point of course.

 

[Andrew1990]

Ok, a pivot sounds like what I would need.

 

[Eli]

You're basically trying to make a crankshaft.

Think of an engine.

http://www.explainthatstuff.com/crank-animation.gif

You don't need a spinning rod, you need an offset rod on the gear.

 

[boomerang]

So the spinning rod needs to drive the piston?

 

[Andrew1990]

So the spinning rod needs to drive the piston?

Yes

You don't need a spinning rod, you need an offset rod on the gear.

So get rid of the rod all together and replace it with an offset rod, so basically setting up a connecting rod?

Edit

Um, meant to post.. not edit your post.

Moderator Eli

 

[Eli]

It's either that or put a disk on the spinning rod, with an offset on it. That seems redundant though, unless there is a technical challenge of putting the offset on the last gear itself like proximity or something.

Like I said, just think of an engine. The disc with an offset rod on it plays the same role as a crankshaft. Infact, that is the most simple form of a crankshaft.

 

[boomerang]

You need a crankshaft just like Eli said.

Typing while Eli was posting.

 

[Moonbeam]

Use a Wrankle piston

 

[Eli]

Use a Wrankle piston

Wankle?

And that would be a rotor. lol