Gear Ratio Help

Ratio = 3600/30 = 1 to 120 ?

You can do a 1/2" teeth and fit about 120 on the big gear.

That should leave you with one tooth on the small gear (should be spaced evenly )

I could not resist!!!

What sort of power need to be transmitted?

You may use planetary gears with the planet carrier as input shaft and the sun as output. The question about the transmitted power is VERY pertinent since the solution can be or not corresponding due to this parameter. Any way the higher number of meshings allows a smaller module and smaller overall dimensions.

OP Line#2 "Project Problem:"

Is this a work project, a home project or a homework project?

The neatest gear reduction system I ever saw used only two gears. A gear fit inside an internal gear. Inside of the gear was a bearing with the input shaft mounted to a point off-center of the bearing. As the bearing wobbled, the gear rotated around the internal gear one tooth per wobble. Great reduction, smooth operation, compact. I expect it vibrated a little, though.

What you describe is a Gear reducer manufactured By Sumitomo Electric. They call it a Cyclo Drive. Not an endorsement but I have used thousands of these things is some of the worst possible conditions and they hold up very well.

2nd that

Sounds like a harmonic drive to me, very durable, zero backlash and easy to repair.

I am asking myself if people who answer questions also read the questions or requests. This guy asks for an RPM AMPLIFIER !!! And he gets answers for RPM REDUCTION.

The cyclo drive I played with would go either way.

Cyclo Drive? How about a cycle drive..

Cool stuff these CVT's..

I'm guessing a vertical axis wind generator.. ?

Why gears? Belts are generally as efficient, and cheaper.

Using J section poly-vee belts ex front loader washing machines 20:1 ratios are practical, a layshaft and second belt drive to give 3600 rpm would be a step on the way to a working drive.

My guess is Savonious(?) rotor to generator, my suggestion would work for some hundereds of watts.

No product, no endorsements, just the formula.

http://www.schsm.org/html/gear_ratio_calculations.html

Other things we are not nowing of is what kind of torque is needed. Can the teeth of the gears take the strain, or do you just need the ratio?

The ratio your are looking for is 1 to 120 Only, and not 1 to 1000 as you mentioned.

If that is correct, your easy method would be a belt drive, probably a flat belt, with the pulley designs properly done to hold the belt in line. To get the 20" diameter limit, you need to do the drive transmission in 2 or 3 stages as to avoid too small a pulley at the output. All depends on the amount of torque you will be transmitting.

Thank You all for your time and ideas.

Hendrik

"That should leave you with one tooth on the small gear (should be spaced evenly )"

I thought the rotating shaft covered that. ;)

"what sort of power needs to be transmitted?"

I am unsure what you mean.

nick name

"You may use planetary gears with the planet carrier as input shaft and the sun as output."

Thanks, after I posted here I ended up poking around some, and was leaning toward planetary gears. I ended up ordering a $15 plastic planetary gear box kit so I could understand better.

"The question about the transmitted power is VERY pertinent since the solution can be or not corresponding due to this parameter."

Again I am unsure what answer to give, but understand the need for this variable to get an answer. Do you mean transmitted WIND power for example ?

"Any way the higher number of meshings allows a smaller module and smaller overall dimensions."

I will keep this in mind, as I try to find a balance between size and number of parts. Thanks.

Guest

"OP Line#2 "Project Problem:"

"Is this a work project, a home project or a homework project?"

Home Project.

Dthomas16

"They call it a Cyclo Drive. Not an endorsement but I have used thousands of these things is some of the worst possible conditions and they hold up very well."

I understand, and appreciate your first hand experience. Thank You. I watched a few videos and they seem like a better option than gears. Depending on cost difference.

Guest

"Sounds like a harmonic drive to me, very durable, zero backlash and easy to repair."

The ones I looked at had an advertised 10,000hr. operational lifetime. Maybe I looked at the wrong kind or misunderstood what I read. I will check again thanks.

JE in Chicago

"Cyclo Drive? How about a"

cycle drive..

"Cool stuff these CVT's.."

Your right, those are a fine bit of engineering. My concern would be dependability in harsh environments and laymen repairs. Thanks for the info.

"I'm guessing a vertical axis wind generator.. ?"

Correct Sir, remote application.

Zaf

"Why gears? Belts are generally as efficient, and cheaper."

No reason, a valid point.

"Using J section poly-vee belts ex front loader washing machines 20:1 ratios are practical, a layshaft and second belt drive to give 3600 rpm would be a step on the way to a working drive."

Thank You for the example and place to scrounge parts.

"My guess is Savonious(?) rotor to generator, my suggestion would work for some hundereds of watts."

Yes Sir. (I had to Google Sovonius)

peteolsen

"No product, no endorsements, just the formula."

http://www.schsm.org/html/gear_ratio_calculations.html

Very nice, Thank You.

"Other things we are not nowing of is what kind of torque is needed."

Understood, I will have to decide on a Generator Head before I can give that parameter.

"Can the teeth of the gears take the strain, or do you just need the ratio?"

I believe the teeth could take the strain. Yes I did need a guide to finding or designing the correct gears or pulleys to find the ratio.

LAA Lucke

"The ratio your are looking for is 1 to 120 Only, and not 1 to 1000 as you mentioned."

Yes Sir, typo.

"If that is correct, your easy method would be a belt drive, probably a flat belt, with the pulley designs properly done to hold the belt in line."

Understood.

"To get the 20" diameter limit, you need to do the drive transmission in 2 or 3 stages as to avoid too small a pulley at the output."

Understood.

"All depends on the amount of torque you will be transmitting."

Drawing it up & gathering the materials for the prototype now.

Once again Thank You all very much for the help.

This may be another insufficient info question but…

Does running a vertical shaft to a horizontal (thru whatever means) Generator lose enough efficiency to preclude it from a design ? If you are looking to squeeze the most out of a design. Or is it negligible dependant on the device (gears or pulleys) used ?

My thought was keeping everything in line would best suit efficiency, and to the availability of Horizontal vs. Vertical Generator Heads.

Task

A right angle transmission requires a conical gear pair or other means so that a supplementary sources of mechanical losses is introduced. If possible stay with a coaxial solution overall efficiency will be higher.

nick name

"A right angle transmission requires a conical gear pair or other means so that a supplementary sources of mechanical losses is introduced."

Thanks nick. It kinda figured, but since I had all of you on the hook I had to check my thinking.

"If possible stay with a coaxial solution overall efficiency will be higher."

Understood, Thank You Sir.