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HI, I don not have either of the superacars and am longing to be able to make
a transmission but can't without the spiecal parts given in the 8880 and 8448.
Does anyone know of a way to make a transmision with out those parts?
Thanks
Geordan
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Here is a transmission I've been working on. It has two forward speeds 5:1 and
1:3. If you run the motor one way, you get forward low gear. If you run the
motor the other way, you get forward high gear.
I am using a differental to split the two directions of rotation onto two
intermediate shafts. I am also using 24 tooth gears as pawls. I have the clear
holes on live shafts, and the slight drag makes them engage positively when the
shaft rotates in the right direction. The two shafts then go through two
different ratios of gear trains, and then get recombined with a second
differential.
The top picture shows the input side. The input goes through a pawl that is
shown engaged with a 24 tg that prevents that shaft from rotating counter
clockwise. Under it is a little 8tg that transfers power to the big 40tg. This
is the powertrain for counterclockwise rotation, which is 5:1 reduction.
The middle picture shows the splitting differential to the right, and the
combining differential to the left.
The bottom picture shows the output side, and the power train for clockwise
power input. The top 24 tg is a pawl on the input shaft that engages when the
input is clockwise. The pair of 8tg reverse the rotation to the combining
diferential, so this direction gives a ratio of 1:3
With a second motor, I think the design could be extended to 3 forward speeds
and one reverse.
http://www.best.com/~amnon/Homepage/Games/LegoTranny.jpg
Send me mail with the word LEGO a the start of the subject to get through my
spam filter.
In lugnet.technic, Dan Boger writes:
> On Tue, Sep 19, 2000 at 11:14:48PM +0000, geordan ballantree wrote:
> >
> > HI, I don not have either of the superacars and am longing to be able to • make
> > a transmission but can't without the spiecal parts given in the 8880 and • 8448.
> > Does anyone know of a way to make a transmision with out those parts?
>
> yah, look here:
>
> http://www.brickshelf.com/scans/0000/0853/
>
> and especially here:
>
> http://www.brickshelf.com/scans/0000/0853/0853-04.html
>
> HTH
>
> Dan
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I just finished a recreation of your transmission. Great piece of
engineering. Thanks for sharing your work. I hope I can work this into one
of my machines.
--
Bob Fay
rfay@we.mediaone.net
The Shop
http://users5.50megs.com/bobfay
http://www.geocities.com/Heartland/Bluffs/7900/
"Amnon Silverstein" <amnon@best.com> wrote in message
news:G1640L.Ls8@lugnet.com...
> Here is a transmission I've been working on. It has two forward speeds 5:1 • and
> 1:3. If you run the motor one way, you get forward low gear. If you run • the
> motor the other way, you get forward high gear.
> I am using a differental to split the two directions of rotation onto two
> intermediate shafts. I am also using 24 tooth gears as pawls. I have the • clear
> holes on live shafts, and the slight drag makes them engage positively • when the
> shaft rotates in the right direction. The two shafts then go through two
> different ratios of gear trains, and then get recombined with a second
> differential.
> The top picture shows the input side. The input goes through a pawl that • is
> shown engaged with a 24 tg that prevents that shaft from rotating counter
> clockwise. Under it is a little 8tg that transfers power to the big 40tg. • This
> is the powertrain for counterclockwise rotation, which is 5:1 reduction.
> The middle picture shows the splitting differential to the right, and the
> combining differential to the left.
> The bottom picture shows the output side, and the power train for • clockwise
> power input. The top 24 tg is a pawl on the input shaft that engages when • the
> input is clockwise. The pair of 8tg reverse the rotation to the combining
> diferential, so this direction gives a ratio of 1:3
> With a second motor, I think the design could be extended to 3 forward • speeds
> and one reverse.
>
> http://www.best.com/~amnon/Homepage/Games/LegoTranny.jpg
>
> Send me mail with the word LEGO a the start of the subject to get through • my
> spam filter.
>
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Hey, Check out my page www.lcs.net/users/oglewood/
Go under "lego Ideas" and click on the two speed transmission. Also, I have
tried it with four speeds (R-1-2-3) but it gets too big after that. Hope
that helps!
Adam
"Bob Fay" <rfay@we.mediaone.net> wrote in message
news:G16zIL.IJo@lugnet.com...
> I just finished a recreation of your transmission. Great piece of
> engineering. Thanks for sharing your work. I hope I can work this into one
> of my machines.
>
> --
> Bob Fay
> rfay@we.mediaone.net
>
> The Shop
> http://users5.50megs.com/bobfay
>
> http://www.geocities.com/Heartland/Bluffs/7900/
> "Amnon Silverstein" <amnon@best.com> wrote in message
> news:G1640L.Ls8@lugnet.com...
> > Here is a transmission I've been working on. It has two forward speeds • 5:1
> and
> > 1:3. If you run the motor one way, you get forward low gear. If you run • the
> > motor the other way, you get forward high gear.
> > I am using a differental to split the two directions of rotation onto • two
> > intermediate shafts. I am also using 24 tooth gears as pawls. I have the • clear
> > holes on live shafts, and the slight drag makes them engage positively • when the
> > shaft rotates in the right direction. The two shafts then go through two
> > different ratios of gear trains, and then get recombined with a second
> > differential.
> > The top picture shows the input side. The input goes through a pawl that • is
> > shown engaged with a 24 tg that prevents that shaft from rotating • counter
> > clockwise. Under it is a little 8tg that transfers power to the big • 40tg.
> This
> > is the powertrain for counterclockwise rotation, which is 5:1 reduction.
> > The middle picture shows the splitting differential to the right, and • the
> > combining differential to the left.
> > The bottom picture shows the output side, and the power train for • clockwise
> > power input. The top 24 tg is a pawl on the input shaft that engages • when
> the
> > input is clockwise. The pair of 8tg reverse the rotation to the • combining
> > diferential, so this direction gives a ratio of 1:3
> > With a second motor, I think the design could be extended to 3 forward • speeds
> > and one reverse.
> >
> > http://www.best.com/~amnon/Homepage/Games/LegoTranny.jpg
> >
> > Send me mail with the word LEGO a the start of the subject to get • through
> my
> > spam filter.
>
>
>
>
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This is another nice piece of work. I did not understand it until I
downloaded the Dat file and opened it. Very nice! This is another useable
design. Thanks for posting it. A top view would be really cool on your
website.
--
Bob Fay
rfay@we.mediaone.net
The Shop
http://users5.50megs.com/bobfay
http://www.geocities.com/Heartland/Bluffs/7900/
"Adam Ogle" <oglewood@lcs.net> wrote in message
news:G175u6.MMC@lugnet.com...
> Hey, Check out my page www.lcs.net/users/oglewood/
> Go under "lego Ideas" and click on the two speed transmission. Also, I • have
> tried it with four speeds (R-1-2-3) but it gets too big after that. Hope
> that helps!
>
> Adam
>
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In lugnet.technic, Dan Boger writes:
> On Tue, Sep 19, 2000 at 11:14:48PM +0000, geordan ballantree wrote:
> >
> > HI, I don not have either of the superacars and am longing to be able to
> > make a transmission but can't without the spiecal parts given in the 8880
> > and 8448.
> > Does anyone know of a way to make a transmision with out those parts?
>
> yah, look here:
>
> http://www.brickshelf.com/scans/0000/0853/
>
> and especially here:
>
> http://www.brickshelf.com/scans/0000/0853/0853-04.html
In the same manner as on the above model, but using varying
ratios both between input and sliding axle and between sliding axle
and output, it is relatively easy to increase the number of speeds -
though at some point, one will need an axle connector in the
rather long slding axle. I've gotten up to six speeds in
an input/sliding/output setup (also 5+R, with an extra idler gear),
and recently built one with 3 fixed and 2 sliding axles (with
3 and 2 ratios respectively), which results in 6 gears.
Then the 2-ratio axle has a handle as in the pictures above,
the left-right tilt of which is translated into a shifting
of the 3-ratio axle (resulting in a realistically shaped
'H' (3-wide) shift pattern).
A good, easily extended beginning is a rotationally
symmetric setup like this:
(in a monospace font...)
AA AA
===============
333333AA BB
AA 11 @@@@
2222@@@@2222
@@@@ 11 AA
BB AA333333
===============
AA AA
OO
The 3 axles are vertical; == is a technic beam, AA is bare axle,
BB is a bushing, 11 is an 8-gear, 2222 or @@@@ is a 16-gear,
333333 is a 24-gear. The center axle slides; it is shown
in center position (1:1), with a 1-stud length sticking
out top and bottom for sliding (OO marks the first possible spot
where the mounting for the shift handle may begin);
the bits of axle sticking out top left and bottom right
are input and output. The slding axle may be shifted
1 position up or down (for 1:3 and 3:1 respectively).
By toggling any individual axle between using 8/16 gears
and 16/24 gears (and changing the axle distances appropriately),
other gear ratios are easily implemented, e.g.
1:2,1,2:1 and 2:3,1:2,2:9.
Also, longer symmetrical setup could be done using the new
12 and 20 gears (with some restrictions for placement to avoid
gear lock due to their widths).
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In lugnet.technic, Dan Boger writes:
> On Tue, Sep 19, 2000 at 11:14:48PM +0000, geordan ballantree wrote:
> >
> > HI, I don not have either of the superacars and am longing to be able to • make
> > a transmission but can't without the spiecal parts given in the 8880 and • 8448.
> > Does anyone know of a way to make a transmision with out those parts?
>
> yah, look here:
>
> http://www.brickshelf.com/scans/0000/0853/
>
> and especially here:
>
> http://www.brickshelf.com/scans/0000/0853/0853-04.html
>
> HTH
>
> Dan
THanks, now I'm going to attempt at making a car similar to those driven at le
mans and sebring, going to be a bit hard with my biggest set being the Indy
storm.
THanks
Geordan
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