Automatic gearbox

[Zerobricks]

Differential always splits to the easyest side. The left side has friction and the right doesnt. This means the power normally goes to the right side. But when the load becomes higher than friction on left side, the power is sent to left side, where there is a higher gear ratio. Total gear ratio is between 1:1 and 5:1.

Video:

[Milan]

Great design, I like the fact it is not too bulky.

I am always impressed with automatic gearboxes. Good one, Zblj!

[Lupus74]

Great work! It shows the technical function without beeing to complex. Any Ideas how to fit it into a car or truck yet?

[5150 Lego]

very interesting. I'm curious to see this used in a real working chassis tosee if the gearbox would work like an automatic should. For example, if going up a steep incline would the gearbox downshift? Would the vehicle sstart off in a lower gear and then upshift when it reaches a certain speed? namly a speed fast enough to overcome the resistance that keeps the gearbox in the lower gear?

[CP5670]

I'll need to try building this when I get back home. I like this idea better than the clutch-based automatic transmissions I've seen on Brickshelf, which lock up easily and are not reliable enough to use in an actual model.

I think the friction on the left may be too high though, just from looking at it. One or two rubber belts connecting those axles might work better.