Subject:
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Re: My Lego planetary gear
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 3 Oct 2000 23:46:42 GMT
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Viewed:
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825 times
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By locking the outer ring, in acts as a 2:1 or 1:2 gear (depending on which
shaft you use as input and which as output. If you lock the planets, it turns
into a 1:1. If you let everything loose, it is a neutral gear. If you lock the
output shaftand tap off of the ring somehow, it could act as a reverse, but in
practice this has a few problems. The planets and the sun gear tend to jam and
the gear drag is pretty bad.
Yeah, if Lego made some real parts for this, it would be much easier to rig up
a multi-speed transmission with reverse.
This works well enough to demonstrate the principles of a planitary gear
system, at least.
In lugnet.technic, Geoffrey Hyde writes:
> That is certainly compact. Do you have any ideas how it might be used in an
> actual model? I suppose locking either the top half or the bottom half, or
> both, would change the way the output shaft differs from the input shaft?
>
> Although what I would really like to see is an inner gear ring which is a
> lot larger than the current gears are. I'm not sure if it's technically
> feasible to make, though!
>
> Cheers ...
>
> Geoffrey Hyde
>
>
> Amnon Silverstein <amnon@best.com> wrote in message
> news:G1u5JH.BMp@lugnet.com...
> > I was working on transmission ideas, and I came up with a cute planetary. • It
> > can produce several different types of output, and it is typically used in
> > transmissions. My implementation is compact, and doesn't use too many • parts.
> > I'm not sure that it is useful for anything, but it might be cool in a
> > gearhead-nerd way.
> >
> > http://www.best.com/~amnon/Homepage/Games/PlanetMiddle.jpg
> > http://www.best.com/~amnon/Homepage/Games/PlanetTop.jpg
> > http://www.best.com/~amnon/Homepage/Games/PlanetBottom.jpg
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Message has 1 Reply:
 | | Re: My Lego planetary gear
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| You can actually get very similar behaviour using a standard differential. If you hold one "output" shaft, and turn the other, the crown wheel turns at half the input speed. The advantage of planetary gears is the output shaft is in line with the (...) (24 years ago, 4-Oct-00, to lugnet.technic)
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Message is in Reply To:
| | Re: My Lego planetary gear
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| That is certainly compact. Do you have any ideas how it might be used in an actual model? I suppose locking either the top half or the bottom half, or both, would change the way the output shaft differs from the input shaft? Although what I would (...) (24 years ago, 3-Oct-00, to lugnet.technic)
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