3 speed gearbox for trucktrial

[nielsvdv]

Hi,

I have built a 3 speed gearbox, based on sariels 2 speed.

gearratio's are 1/1,6, 1/1 and 1,6/1.

i have made instructions for it.

http://upload.brickshelf.com/cgi-bin/gallery.cgi?f=476430

pics: http://upload.brickshelf.com/cgi-bin/gallery.cgi?f=476199

vid of older version:

shifting is done with a miniLA

hope u like it, or could use it.

regards

NielsVDV

[Ramacco]

This is my prototype of a 3-speed gearbox for TruckTrial (Belgium)

Ramacco

[Nazgarot]

Does this work if you change it slower, like with a mini Linear Actuator?

[Bulle]

Most three speed boxes look exactly like that. I would be more insterested in how you would motorize the "switching" it self, which i never seen illustrated anywhere..

Edited July 6, 2011 by Bulle

[nielsvdv]

Most three speed boxes look exactly like that. I would be more insterested in how you would motorize the "switching" it self, which i never seen illustrated anywhere..

i just connectet a miniLA on a centralpoint, and motorise it with an M motor( 1/1)

my new tatra has a 2 speed, here is a vid while it shifts.

[Montage]

Shifting can be done with a mini LA or an LA whichever you prefer and a M motor. Not much if any gearing down of the motor is necessary since all you are doing is sliding one portion of the gearbox over the other.

[Bulle]

Shifting can be done with a mini LA or an LA whichever you prefer and a M motor. Not much if any gearing down of the motor is necessary since all you are doing is sliding one portion of the gearbox over the other.

No to steal this thread or anything, but i feel that both of the LA's are too large and make the whole box too big.

[nielsvdv]

No to steal this thread or anything, but i feel that both of the LA's are too large and make the whole box too big.

true and not true, making it too easy would take away the challenge, in my vid you can see i positioned the m motor with minila between my 2 xl's for driving. keep on searching for the solution i would say :)

you can also slide it with a 6 l link and a wormgear :)

[garson]

This is my prototype of a 3-speed gearbox for TruckTrial (Belgium)

Ramacco

i remember reading about this but on your tatra your shock abosrbers had a technic half bush on the rod part making the spring harder, how did you get the bush on there?

btw i think you should switch your gears around because in low gear thats when the motor is using the most torque and is furthest away and axle twisting is most likely to happen but if in high gear it wont matter because the motor wont be making as much torque

Edited July 8, 2011 by garson

[Bulle]

you can also slide it with a 6 l link and a wormgear :)

Could you please elaborate or maybe a pic? Anyway thanx :)

[Milan]

i remember reading about this but on your tatra your shock abosrbers had a technic half bush on the rod part making the spring harder, how did you get the bush on there?

It is the idea of Atr: