Subject:
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Re: 2 speed automatic transmission
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 24 Nov 1998 13:54:02 GMT
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Viewed:
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1984 times
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Here is some help....
> Based on this design, http://www.sonic.net/~rci/transmission.htm
2424242 888
E E
===============
[] | | [] TOP VIEW
][ 888 888 ][ <= drive shaft
[] E E []
===============
(1)E (2)E
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D
DRIVE SHAFT
=E][E==WWWWW==E][=>>><<<MMMMMMMMM
242424 = 24 tooth gear
888 = 8 tooth gear
| = axle
E = ½ bushing
============ = plate
[] = 1 X 4 plate
][ = 1 X 4 beam
WWWWW = worm gear
> > > <<< = axle connector
MMMMMM = motor
D = Drive shaft
When the motor turn in one direction, shaft (1)
has the drive in HIGH. when the motor turns in
the other direction, shaft (2) has the drive
and the 8:24 ratio puts it into LOW on the drive shaft.
To make it automatic, you use one sensor and a weighted
pendulum that moves freely
FLAT |
- O -
I
I
I
I S======
ISS ]
# S======
DOWN |
- O -
I
I
I
I S======
I SS ]
# S======
UPHILL|
- O -
I
I
I
I S======
ISS ]
#S======
When it goes uphil, the weighted pendulum makes contact with
the sensor, this causes the motor to reverse direction and
shift the transmission to low gear. when it reaches level ground,
the pendulum swings forware, moving off the sensor, and this
causes the motor to change directions, thus shifting to HIGH.
> 2 speed automatic transmission challenge
> Based on this design, http://www.sonic.net/~rci/transmission.htm
> can you come up with a 2 speed automatic transmission.
> I did.
> Here are some specs:
> 1) When it goes up an incline, it shifts to low gear.
> 2) On flat and downhill, it is in HIGH gear.
> 3) Use the RCX, 1 motor, and 1 touch sensor.
> Good luck.
> Dave :-)
Chris Moseley writes:
> Dave Forrest wrote in message ...
> > Based on this design, http://www.sonic.net/~rci/transmission.htm
> > can you come up with a 2 speed automatic transmission.
>
>
> Um, that's is a device to split the output based on the direction of the
> input. Making that into an automatic transmission would be hard I would
> think, as you need forward/reverse plus hi/lo, and those are orthogonal
> (4 values total).
>
> I'd be tempted to use a gravity-based system - as the motor torque
> increases it lifts the motor until it engages a second drive output.
> Hmm, can't see an easy way to make it shift down nicely tho.
>
> Perhaps a semi-manual - it shifts when driven the right way with the
> right load. Will have to have a play.
>
> Moz
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Message is in Reply To:
 | | Re: 2 speed automatic transmission challenge
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| Dave Forrest wrote in message ... (...) Um, that's is a device to split the output based on the direction of the input. Making that into an automatic transmission would be hard I would think, as you need forward/reverse plus hi/lo, and those are (...) (26 years ago, 24-Nov-98, to lugnet.robotics)
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