Subject:
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More Directional transmissions...
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 1 Dec 1999 21:27:48 GMT
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Viewed:
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423 times
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At the risk of boring folks with my mechanical tinkerings...
I want to create a transmission such that drivng the input shaft one way
gives me very slow rotation on the output, but driving it the other way
gives me fast rotation in the opposite direction on the same output axle.
I've got several working models, but they all have the same problem: in
the slow rotation case it's fine, I have a long reducing gear train to
give me very slow rotation on the output. But in the fast rotation case,
the entire gear train is "back driven" by the output axle, and since the
gear train from this direction is "gearing up", the load on the motor is
very heavy, and there are lots of gears spinning VERY fast for no good
reason.
So I've been trying to come up with a way to disconnect the output axle
from the gear train in that case, but the usual "gear on a swing arm"
method can't work. In fact, it's this very principle that makes "pull
back" motors work at all. Those who have messed with this stuff a lot
will understand why. It was a revelation for me, I admit, but that's a
big part of why this is so much fun :-)
Incidentally, if the output shaft can rotate the same direction in both
cases (fast and slow), I can make it work fine. But I really need a "fast
reverse".
So I guess the question is this: are there other ways to disconnect a
gear train besides the swing arm? Or is there any way to connect or
disconnect a gear based on speed of rotation? Does anyone have any ideas
and/or references for this kind of thing? Does anyone even know what I'm
talking about? :-)
Dave Johnson
Amateur Mindstormist
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Message has 1 Reply:
 | | RE: More Directional transmissions...
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| (...) I think you want a gear that engages in only one direction of rotation. It should disconnect (or idle) when turned the other way. I haven't thought this all the way through, but I suspect you might be able to use a pair of differentials. You (...) (25 years ago, 1-Dec-99, to lugnet.robotics)
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