Epicyclic gears

[John S]

Working on  a speed increaser design.

http://www.youtube.com/watch?v=y6ZMCyz1Dvc

What I want to do is drive the planet carrier [ not shown ] with the two outside planet gears on it, hold the ring gear and take the output off the sun.

With a 60T ring and 20T sun and planets it should rotate the same way at a 4:1 increase.

Any clues how to hold and drive this if at all possible?

Thanks lads.

[Anthony]

John,

I don't understan d the problem, could you provide more info?

It seems obvious that the ring is tied to the housing or stator. Shaft comes in on one side with a spider to carry the planets. Shaft carrying the sun goes out the other side for output. Actually, in and out could both go in the same direction, coaxial shafts with the sun shaft inside the planet shaft.

It's also possible to have brake and clutch mechanism s on each of the elements so any element can be fixed, any of the other two can be input, and the third of the three can be output.

Even beyond that, with just these three elements two can be driven and the third transmit a different ial output influnced by both of the others.

More info please.

Anthony

[BobL]

John;

 Not quite sure either of what your asking, but do you mean for the 60T ring to also rotate in the same direction as your 20T gear? Also wouldn't this be a 3:1 ratio?

Cheers
Bob

[Anthony]

John;

 Not quite sure either of what your asking, but do you mean for the 60T ring to also rotate in the same direction as your 20T gear? Also wouldn't this be a 3:1 ratio?

Cheers
Bob

If the ring and the sun both rotate at the same time at the same speed in the same direction the planets will not rotate individua lly within the set but will be carried around with their spider at the same speed as the ring and sun. If the ring and sun are both rotating but at different speeds the planets and their spider will traverse within the system at a rate dependent on the relative speeds of the ring and sun.

(By the way, should the ring be called "the Universe" because the sun and planets operate within it? Or perhaps just "the Galaxy"?) LOL

Anthony

[BobL]

Anthony;

 Thanks for the clarifica tion. I was thinking John was asking for the planetary to be fixed while rotating the inner gears. I know GM doesn't allow for one gear to be locked as this would implement some very serious math to make it happen, but while looking at his inner gear specs in GM I saw a 3:1 ratio.

Cheers
Bob   

[Anthony]

Anthony;

 Thanks for the clarifica tion. I was thinking John was asking for the planetary to be fixed while rotating the inner gears. I know GM doesn't allow for one gear to be locked as this would implement some very serious math to make it happen, but while looking at his inner gear specs in GM I saw a 3:1 ratio.

Cheers
Bob   

Bob,

There is a 3:1 ratio between the tooth counts of the ring and sun gears but as the planets rotate as a set within the ring gear not only does their rotation drive the sun but their progressi on as a set around the circle adds an additiona l factor of 1. Therefore 4:1 increase by the sun relative to the planet carrier.

Anthony