Lego Technic Automatic 4-speed Transmission Prototype

Still needs some work. Instructions for the regular non-automatic version: sariel.pl/downloads/
The selector piece: www.bricklink.com/v2/catalog/...

[@jonhlennon312]

I am more impressed on how you managed to create a 'resistance sensor' with the rubber band and the lever.

[@43615]

Using a diff and a rubber band to measure resistance? Someone, give this man a job at LEGO.

[@modelllichtsysteme]

Back in 1995, I would give all my toys or what ever to have such a transmission for my LEGO Technik cars! WELL DONE SARIEL!

[@TechnoFishlego]

Finally and automatic transmission that works

[@messiermitchell4901]

I've seen auto 'boxes before, but this one has the most potential I feel.

[@suspense_comix3237]

I don't really consider this to be a great mechanism however. The shifter isn't smooth, it starts vibrating in place because it's trying to turn something stationary. This won't be a very smooth ride.

[@suspense_comix3237]

Also if you are using a transmission in something like a Heavy-Duty vehicle, it's much better to make it remotely controlled rather than automatic

[@willtubes73]

I've probably been subscribed to you since about 2015. Not sure of the exact date, but I'm always glad to see an email notifying me that you uploaded a video!

[@carpet_cleaneer5062]

Everybody gansta till the LEGO car starts shifting

[@suspense_comix3237]

Some real automatic transmissions use computers to shift gears, so I guess you can use a LEGO Mindstorms, NXT, or EV3 brick to make your transmission.

[@fuchs_1053]

The problem is, that the clutches aren't getting locked in perfectly, the angle of the clutch stepper, is only sometimes in the perfect 90 degree position needed, to have a flawless shift. If you would just simply ad a 90 degree stepper to the clutch stepper as for example used in the bugatti chiron you could get rid of the stepper standing at a wrong angle. The transmission would then not shift in a liniear motion but in 4 steps, which will make it more accurate and stabalized in 2nd and 3rd gear.

[@theq4602]

Sariel: I've run out of ideas on how to improve this.

[@ayporos]

> Creates beautiful automatic downshifting mechanism

[@smorris12]

Four gears in so few parts is amazingly clever. I suspect that the smooth shifting problem can't be solved with equal simplicity but, as an engineer, I am very impressed. Bravo!

[@qoodles4032]

2:23

[@coolranch7537]

that’s actually really smart and compact

[@tylernatale7898]

I'm definitely gonna do some playing around with this idea when I get home, it has some real potential. Nice work!

[@ssisk87]

Bro...

[@Stigsens1]

I was building lego since i was a baby, 49 years ago. (Being from Denmark) when I see what you guys come up with, i get so so humble and proud at the same time. That a tiny (in the start) company in Denmark produce small plastic bits, that can be used like this. You guys are so creative....

[@carenthusiast172]

Sariel in 2025: I've made the Koenigsegg Regera transmission from Lego, not really reliable though.