Vertical movement turning a gear

[abdo799]

i am still newbie , i don't even know if this question should go here or not , but i will ask it anyway.
I have a rod that moves vertically , i need use this rod to make a shaft turn. So i had an idea, what if i made this rod toothed and make it move a gear as it goes up , will that work?
if no , why?

 

[Baluncore]

A straight rod with gear teeth is called a rack. It could drive a gear wheel on a shaft but would need to be held in contact with the gear.
Depending on the rotation angle required an alternative could be to use a crank.
Also consider a tape or cord on a drum. Maybe with an idler.
I would consider a stepped rubber belt running over a stepped pulley on the shaft, with an idler gear.

 

[abdo799]

A straight rod with gear teeth is called a rack. It could drive a gear wheel on a shaft but would need to be held in contact with the gear.
Depending on the rotation angle required an alternative could be to use a crank.
Also consider a tape or cord on a drum. Maybe with an idler.
I would consider a stepped rubber belt running over a stepped pulley on the shaft, with an idler gear.

I am still in high school , so if you can give a site or a book or something so I can know what's an idler , crank and all those things , that would be appreciated

 

[abdo799]

I checked what a crank means , I don't think I need it , I just need to make the shaft turn , later it will turn a wheel , another thing , if the rod moves up the gear will turn anti-clockwise if it moves downwards, the gear will turn clockwise , is there anything I could to make the shaft turn in one direction in both cases ( the shaft doesn't have to be connected to the main gear )

 

[Baluncore]

If you have two parallel racks joined and driven from one end, but with the racks on different sides of the gear, then the direction of rotation will be decided by which rack you engage with the gear. To travel continuously in one direction you must alternate between racks as they reciprocate.

 

[xxChrisxx]

A ratchet. Movement in one direction, but only in a single stroke. Would be notchy, but could be butchered from an old bicycle.

Or

Sprag clutch. Movement in one direction, again only on one stroke, and you can keep a rack constantly engaged.

 

[abdo799]

@baluncore, your idea could work, but i can't use more than one rack
@xxchrisxx, what i meant is not that i want the gear to move in only one way , i meant if you know a combination of gears or something that can make a shaft turn in same direction despite of the movement of the rack, like a motor piston ( i know it works differently than a rack ) i moves up and down , but the wheel turns in one direction

 

[xxChrisxx]

@baluncore, your idea could work, but i can't use more than one rack
@xxchrisxx, what i meant is not that i want the gear to move in only one way , i meant if you know a combination of gears or something that can make a shaft turn in same direction despite of the movement of the rack, like a motor piston ( i know it works differently than a rack ) i moves up and down , but the wheel turns in one direction

I'm fairly sure you can do it with a series of clutches, but it'll be a total nightmare to set up so it doesn't jam.

But if you really want a smooth input, with the linear input driving in both directions.

VVVVVVVVV

I checked what a crank means , I don't think I need it

You'll need a crank.

This mechanism is basically a crank slider.
The problem with a crank is, you need to start it spinning the way you want and keep the momentum up. If not it'll jam at the top or the bottom, or go the wrong way.

Think a Railway Handcar.

 

[abdo799]

I'm fairly sure you can do it with a series of clutches, but it'll be a total nightmare to set up so it doesn't jam.

But if you really want a smooth input, with the linear input driving in both directions.

VVVVVVVVV

.

I am going to connect a generator to the shaft, maybe if this going to be complicated , maybe it won't matter , the generator produces AC anyway , right ?

 

[arunsjunk]

Perhaps the following book could be an inspiration:

https://www.amazon.com/dp/1603863117/?tag=pfamazon01-20Instead of the rack and pinion described earlier, you can get uniform circular motion from a modified pinion. Here's a video of the design:

 

[abdo799]

Perhaps the following book could be an inspiration:

https://www.amazon.com/dp/1603863117/?tag=pfamazon01-20


Instead of the rack and pinion described earlier, you can get uniform circular motion from a modified pinion. Here's a video of the design:

thanks, if you know any other book about mechanical design please tell me it's name ( preferred to be a book for newbies and not advanced )

 

[BvU]

this cute animated picture I enjoyed this thread so much that I want to add the first thing that came to my mind: Hey, these early steam engine fellows had the same problem !

Also a little bit because I wondered how it could be that this thread went off to pretty complicated stuff (lots of wear, etc.)

Re the AC generator: yes they produce AC (DC with a commutator or with a rectifier circuit). But they like some constant driving. A rack up and down might not be ideal, if the up and down is a sine.