Subject:
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Re: Automatic Transmission
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 30 Nov 1999 22:56:24 GMT
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Viewed:
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433 times
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Robert,
Some time ago I built something using the gearbox-thingies from the 8880
super car. My vehicle only had two speeds though. But two speeds is quite
enough for an electric motor, which operates well over a much wider range of
rpm's than an internal combustion engine.
I used a rotation sensor on the drive shaft to check for speed and slowing
down/stalling. When rotation speed maxed out it shifted to the high speed.
When it slowed down below a certain threshold number of rpm's, it shifted to
the low speed. Obviously a reverse speed is unnecessary with an electric
motor.
Programming was done in NQC. A lot of tuning was necessary to get it to work
properly. I ran through quite a few batteries testing it too. Unfortunately
I lost the source code and used the parts for something else. I may try to
resurrect it in the near future though.
Of course this is a software solution as opposed to the hardware approach
you've been using so far. I'm not sure if a software solution is what you're
looking for.
Have fun anyway,
Arjen
"Robert Eddings" <webmake@bellsouth.net> wrote in message
news:384446A5.5EC2465@bellsouth.net...
>
> I have been working on building an automatic transmission for quite some
> time but have yet to come up with satisfactory solutions. I am looking
> for additional ideas to try. What I consider to be an automatic
> transmission in this case is:
>
> [Drive train defaults to a high speed / low torque gear ratio. When
> resistance on the gear train causes the motor to stall, the drive shaft
> transfers (slips or flips) to another gear train with a lower speed /
> higher torque gear ratio. When the resistance is lowered, the drive
> shaft reverts back to a higher speed / lower torque gear train.]
>
> One experiment used a worm gear that slid along the drive shaft. The
> worm gear first drives the high speed / low torque gear train. The worm
> gear is kept from sliding forward by a collar in front of the worm gear
> that slides freely on the drive shaft and is connected to rubber bands.
> When the resistance to drive the first gear train is greater than the
> resistance caused buy the rubber bands, the worm gear slides forward to
> engage another gear train. This almost works but I can't keep the worm
> gear from binding between the gear trains and causing a stall.
>
> Any ideas or suggestions would be helpful.
> Thanks,
> Robert Eddings
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Message is in Reply To:
 | | Automatic Transmission
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| I have been working on building an automatic transmission for quite some time but have yet to come up with satisfactory solutions. I am looking for additional ideas to try. What I consider to be an automatic transmission in this case is: [Drive (...) (25 years ago, 30-Nov-99, to lugnet.robotics)
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