Subject:
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Re: Automatic transmission update
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 16 Jan 1999 02:04:02 GMT
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Original-From:
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Clay Aucoin <caucoin@cruiseshoppes.com^saynotospam^>
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Reply-To:
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<caucoin@cruiseshoppes+spamcake+.com>
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Viewed:
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2840 times
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When are you going to be putting some pictures up. I know of a few of us
really want(need) to see some pictures even if they are drawings.
Clay Aucoin
Andrew Carol <lego-robotics@crynwr.com> wrote in message
<199811270218.UAA25508@dfw-ix13.ix.netcom.com>...
> I've redesigned the automatic transmission and made it much more compact
> with lots fewer gears.
> (I hope to take pictures of this and load it somewhere...)
>
> A big breakthrough was to change how I combined the high and low gear with • a
> differential. Previously I used each side axle as an input and used the
> gear on the body as an output. Now I use one side axle as the low gear
> input, and the differential body gear as the high gear input. This leaves
> the remaining axle as the output.
>
> This allows me to place the differential in a much more favorable position
> relative to the core of the transmission, saving at least four gears and
> lots of volume
>
> I then built a car to 'test' the transmission. It rolls on a carpet in • high
> gear, but when it encounters a slope (a 3-hole binder), it stalls for a
> moment, transitions into low gear, and climbs. When it comes to the top • and
> goes back down the ramp on the other side, it switches back to high gear.
>
> The only problem I have is that while very light loads stays firmly in • high
> gear, and heavy loads stay firmly in low gear, in-between loads often
> oscillate between the two gears. This is because just as it enters low
> gear, it moves forward which lightens the load and it pops back. This
> in-between mode acts as an intermediate gear because it does have more • power
> than high gear, but it moves in a jerky fashion (and is noisy!). I am
> working on making the switching smoother.
>
> --- Andrew
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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