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....
I’m so glad that we finally have a 2nd (That I know of) automatic transmission in this hobby. I built the version from Lego Technic Mastery, but the frame was very odd and hard to fit into a model, in addition to only having 2 gears. (It’s a fantastic design still, and very compact, I just never plan for these things haha) I would imagine that playing with the tension of both the stepper band and the shifter band could be used to find a ratio that would be smoothest? Just an idea. Now, back to building! 🐶
Lot of pieces... But 99% of them are old pieces from 2000... Lots of ideas... But 99% of them are with pieces more actual XD so in some way I understand you... Well at least I can build the last percent of my ideas XD
The general idea would be to have some kind of sprung shifting mechanism with hysteresis. One way of doing that would be to separate the shifting shaft from the resistance shaft, then couple them with another short rubber band. So the shifting is driven the short rubber band instead of directly geared to the output. When the resistance shaft is turned, it would stretch the rubber band to the shifting shaft until the shifting shaft jumped out of its current position and onto the next one (would require a modification of the detent mechanism, too). Sorry, I don't have the parts to test it myself 😞
I think you are missing precise shimming and detents. gearboxes use spring loaded detents to ensure precise step changes. Too much "slop" in the sytem. Also, the rubber band, whilst simple and elegant, will change resistance as it wraps around. Maybe a spring loaded detent either side of each gear, would be more precise? It will still have to use resistance to overcome the detent (spring loaded pin) but should sit in the precise valley of each gear, instead of being able to be "between gears". Great work, nice idea though. Looks fantastic so far. Keep going.
need the torque converter on the motor side, that way it starts off with the most resistance and then shifts up to higher gears as it starts to accelerate, just like a rear automatic transmission
Maybe add an elastic (or possibly flywheel) energy storage to the output to maintain tourqe for the fraction of a second that the shift requires. Or require that the shifter has some hysteresis, that is that it must turn furter to initiate the shift, than to maintain it.
This would be horrible in a car, but it’s amazing for its use, though I’m sure a CVT of the same design would work better since applying gears is more seamless and has less need for hysteresis
Thats friggin genius. Great work. I would assume with bigger and heavier vehicles/different tires etc, one has to adjust the position of the static end of the rubber band for adjusted shifting/ and or change the shifter to a more rigid friction?!
What if you separate odd and even gears, use a a pair of friction-based clutches (no gears) that are mutually exclusive (when one is active the other is released and vice-versa) to select the active gear between odd and even, and always have the gear bellow the active gear selected on the idle side ready to be activated (with some exception for the 1st gear since there isn't a lower gear)? Wouldn't this allow for smooth downshifting? (upshifting doesn't have to be as smooth since for those cases you can count on the vehicle momentum to keep things going)
I'm wondering, could a similar system also be geared to favour speed and acceleration instead of strength? And could it be made efficient enough to outperform a motor without gearbox? I'm afraid such systems still lose power stretching rubber bands. Beside that, this is a very impressive solution.
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. Pls like so he can see. Edit: Yo grammar police chill down, im fqin German 2nd Edit: You could try using the axle connectors with the clicking mechanism instead of the smooth connectors, where the clutch moves freely. Could work too, because the gears kinda click and lock in place and a certain amount of tension is needed to reach the next gear. Replacing one of the axle-connectors should be enough.
I think that another problem is the way the strength is tested, by the elastic circling around a piece... If it was linear more than round, the shifting for the second and first speed won't be so hard...
Don't confuse "An" and "A" because you only put "an" if the following word starts with a vowel otherwise always use "A" ...don't worry you'll get it at some point
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!
Bro... Most people: Look, I made a car out of Lego... Sariel: I made a self adjusting automatic transmission, it's not perfect can you guys give me ideas on how to perfect it? The rest of us:... ... This guy made an automatic transmission out of Lego?... Can barely comprehend that let alone help you lol... Nah but seriously good luck on it, that's a game changer right there...
These arnt the same kinds of "lego" pieces that you get from your local store. The kind we all grew up with. These are custom made for projects like this. Its basically just plastic made to look like lego. Still neat, but not mind blowing. Now, if he were able to make a working transmission using just standard lego pieces, that would be impressive.
Awesome work as always. What about some sort of centrifugal clutch mechanism? It would be too big, but might work. Or even several clutches with varying degrees of force needed to engage. In my head it would work backwards, with the least amount of resistance on the output shaft, all four clutches are engaged, as the force builds, the weakest slips, causing the gear ratio change when only 3 clutches ares spinning. Etc etc until only the last clutch has engaged (1st gear) or could even be adjusted to slip to prevent over-stressing the motor? Grain of salt. I've got ideas in my head but not enough experience (yet) to implement it. I just know I've seen functional clutches in Lego in the past. 🤷♂️
Hey! Long time viewer, first time comment. Might I suggest moving the shifting mechanism to the input side? It theoretically should be able to keep engaged at all times, and hopefully run smoothly! I will try and experiment at home with some ideas for making your mechanism smoother, and let you know if I find anything. I built your 3 speed transmission and removed the limiting 5 stud liftarm to allow it to have a "Neutral" position (Needed for a moc I'm working on) but I thought it might be interesting to make it an automatic transmission. I got my parts from lego and built it today, so again when I get more time I'll try and experiment with your automatic trans :) On a side note, the reason I decided to modify your 3 speed to be 3 + N is because the powerhouse is a Pneumatic Engine made with the lego fake engines. I've come to near perfection with it's design and hope to upload some videos shortly (on alt account) to show it's speed! It's not super torquey but it is fast, faster than most LPE's I've seen, and very compact. (Currently attempting to fit it into the Dom's Dodge Charger, by replacing the V8 inside it with my own. It will hopefully run with the trans in it too!)
Putting the tension system on the input side would result in inaccurate sensing because the shifts would affect the tension then. Every time it shifted down, tension would let off, and it would shift back up, increasing tension, shifting back down, back and forth.
@@keithklassen5320 Yeah, that's more or less the point. I tried it myself and it worked much smoother with shifting because it had a constant input. It did shift up and down, but it was relatively smooth and took a lot of torque off the motor.
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!
This is brilliant! I've seen this concept applied to 2-speed transmissions, but I would have never thought about something like this! As for the stalling in "neutral", maybe the gap between consecutive gears wouldn't be as large if you built a true dual-clutch gearbox? It would probably be a lot bulkier. I know Sheepo built a PDK for his Porsche model, with actual (rubber-based, I think) clutches instead of relying on these transmission rings.
It seems like it doesn't need a "clutch", but exactly the opposite: a lockout to prevent the rubber band from spinning the shift selector backwards while in neutral. The only problem is preventing the lockout from being activated when there is low resistance, so that it can still be able to down shift. Could a one-way freewheel lockout be applied to the transmission side of the resistance measurement differential? It would need to be activated when the resistance is high, but not when the resistance is low... Maybe using an offset phase cam you could lower the lockout lever during shifts to prevent back-spin in neutral? Maybe this could be a second function of the spinning square cam that helps hold it in gear.
@@haphazard1342 the not needing a clutch is partly because the lego motors are so weak relative to their size when compared to car engines. ive done alot of lego with drill motors and i found myself needing clutches alot to help not break parts while shifting or other similar operations in tank transmissions. i also created a "torque converter" out of a swivel base thing filled with bike chain oil that worked well to soften the shock of sudden electric torque.
thanks for not disabling comments. youtube thinks that disabling comments and not saying a word that causes demonetization makes the video for kids and disabling the miniplayer
Idea: increace speed in 4 times before 90° speed tester and then decreace in 4 times before exit. You can use other constant instead if 4 but in case of using this idea you should make tester softer in 4 times. This idea will take less time to switch speed
Never have I seen such detailed videos like this, I just want to say that whatever you are doing keep it up, favorite channel at the moment. Cheers lad. Also tell the hamsters I said hi. :)
When the clutch decouples for shifting down gear, the torque goes to zero and the mechanism goes into shift up mode. There is a delay because the mechanism takes some time to go from down to up shifting. Only when the down shifting is complete before the mechanism is into up shifting mode, the shift is successful. So a further delay would make downshifting more reliable. It could be done with a directional friction brake on the gear selector wheel. Or maybe freeze the gear selector in place until the shift has completed.
I thought of that at first as well, but the gear selector is directly linked to the shifter, so if you freeze it or delay it, it also freezes or delays the shift, so it wouldn't work. It only works now because the gear selector can sometimes get enough momentum to go through the whole shift, even though the torque is zero (it helps that there is only a small part in the cycle where it's really decoupled). You would need to either make it easier for it go get the momentum it needs, or decouple the gear selector from the shifter and add some sort of locking mechanism to force it to remain at one of the 4 positions. Then, depending on how you do it, adding the freeze to the gear selector would work. I have no idea how to do all that with lego, though, at least on that size.
I’m not sure if this would work, but if you use weaker rubber bands, the red T joint thing that turns 90 degrees each time it changes gear, the gear change will require less effort hence a smoother change in gears, or just generally use weaker/more stretchy rubber bands, that should allow for the gears to change more smoother, I hope this helps!
Just talking out loud here. These are not criticisms. I am just listing out my observations. I am trying to get this straight for myself. Please correctly if I am wrong... This design is always "wasting/using/diverting" a portion of the motor's power to keep it shifted in gears 3, 2, and 1. The lower the gear, the more power is diverted to the shift mechanism into stretching the rubber band. There is additional motor energy used to separate the locking mechanism when the RED part rotates (1:23). So, even though you have increased the gear ratio to the output, you are effectively using a "weaker" motor. This is a more advanced version of your previous "Lego 2 Speed Automatic Gearbox" (ua-cam.com/video/OtcFXSR33kM/v-deo.html) that required the same sacrifice. I will build it later, but I can roughly picture the power consumption of the shifting mechanism vs time in my head. Suggestion: (2:04) Reduced the rubber band (spring) strength but use 1 or 2 rubber axle connectors (45590) on the wedge belt wheels (4185). The 45590 will be acting as a constant brake on the 4185. I am trying to make the 45590 act like a damper to "hold" the 4185 in place when it is shifting to reduce the chatter you are seeing. The goal would be to pair the right amount of friction from the 45590 and rubber band to require same/similar amount of energy to do a shift but the 45590 could hold it there once it is shifting. Just an initial idea. Good luck!
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.
Using a diff and a rubber band to measure resistance? Someone, give this man a job at LEGO.
I can has job? I thought of the same idea
Or NASA!
that has been done ages ago its not new look automatic transmissions on youtube.
Not to take away from sariel, this is really clean and well presented
@@RAiNfORAiNbOW I know
precision polish engineering
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....
i personally just wish it was easier to work for the main company..not just stores
that’s actually really smart and compact
I’m so glad that we finally have a 2nd (That I know of) automatic transmission in this hobby. I built the version from Lego Technic Mastery, but the frame was very odd and hard to fit into a model, in addition to only having 2 gears. (It’s a fantastic design still, and very compact, I just never plan for these things haha) I would imagine that playing with the tension of both the stepper band and the shifter band could be used to find a ratio that would be smoothest? Just an idea. Now, back to building! 🐶
Welp, that's the coolest Lego mechanism I've ever seen on UA-cam.
I would make much use of this, but I have a lack of parts and the lack of expendable wealth. Sad day.
Schroeddog Power I totally second your comment. I have a lot of ideas but do not have a lot of pieces
So you should exchange some pieces for ideas
@@pmj_studio4065 Is this a joke or can I really do this on a special platform in the internet?
@@thomasstrohmayer2805 there are actually some LEGO forums, like Eurobricks.
Lot of pieces... But 99% of them are old pieces from 2000... Lots of ideas... But 99% of them are with pieces more actual XD so in some way I understand you... Well at least I can build the last percent of my ideas XD
Not that I just found out, but again: You are a genius and I love your review videos and your own creations.
That's impressive. I'm sure you will find the way to make it smoother
The general idea would be to have some kind of sprung shifting mechanism with hysteresis.
One way of doing that would be to separate the shifting shaft from the resistance shaft, then couple them with another short rubber band. So the shifting is driven the short rubber band instead of directly geared to the output. When the resistance shaft is turned, it would stretch the rubber band to the shifting shaft until the shifting shaft jumped out of its current position and onto the next one (would require a modification of the detent mechanism, too). Sorry, I don't have the parts to test it myself 😞
This would make an awesome LEGO RC car
UNBELIEVABLE how somebody can build something like this from LEGO 👍🤔
I think you are missing precise shimming and detents. gearboxes use spring loaded detents to ensure precise step changes. Too much "slop" in the sytem.
Also, the rubber band, whilst simple and elegant, will change resistance as it wraps around. Maybe a spring loaded detent either side of each gear, would be more precise?
It will still have to use resistance to overcome the detent (spring loaded pin) but should sit in the precise valley of each gear, instead of being able to be "between gears".
Great work, nice idea though.
Looks fantastic so far. Keep going.
need the torque converter on the motor side, that way it starts off with the most resistance and then shifts up to higher gears as it starts to accelerate, just like a rear automatic transmission
Really interesting design. Nice one.
Remember when this channel was named Sariel's lego technic den? Feel old yet?
Needs a dual clutch, there won't be any issues shifting gears since they can be preselected.
This is just wow. Really nice work!
Maybe it could shift smoothly if it the stages were "stacked" so that only one would upshift at a time.
Very inspiring ! Thank you Sariel!
Wow, this is extremely impressive!
Nice Work! Best regards from germany
It's so ingenious.
Maybe add an elastic (or possibly flywheel) energy storage to the output to maintain tourqe for the fraction of a second that the shift requires.
Or require that the shifter has some hysteresis, that is that it must turn furter to initiate the shift, than to maintain it.
i swear this guy is a fucking genius
This would be horrible in a car, but it’s amazing for its use, though I’m sure a CVT of the same design would work better since applying gears is more seamless and has less need for hysteresis
NICE ! genius ! I use centi cluth method .. this is awesome .
you could use the switch from power functions that way you’d barely skip a gear
No, that wouldn't work.
Next vid: I made a fullsised fully functional car out of legos
Looking fwd to your lamborghini review
Now make one that shifts UP instead of down.
This is amazing.
Absolutely brilliant. Great work
Great work
I like manuals better but this is pretty cool!
Basically it is a automatic sequential transmission
Thats friggin genius. Great work. I would assume with bigger and heavier vehicles/different tires etc, one has to adjust the position of the static end of the rubber band for adjusted shifting/ and or change the shifter to a more rigid friction?!
Yes, adjusting the tension is all it takes.
The music was very relaxing. Made me fall asleep. What was that?
its realy intelligent design
Looks compact for a 4 speed automatic transmission 👍🏻
You literally drove it until the wheels fell off lol
Some straight up LEGO pornography right there.
that's not the resistance logo, that's the rebel alliance logo.
Genius tbh
Instead of 4-speed, do this on CVT transmission... Might achieve that smooth gear shift....
You're genius 👏
Good music!
nice job
Already better than CVT
I like this vid for The Resistance joke
I am impressed,
Brilliant! 🤜🏽🤛🏽
Wow that’s amazing
Cool stuff
What if you separate odd and even gears, use a a pair of friction-based clutches (no gears) that are mutually exclusive (when one is active the other is released and vice-versa) to select the active gear between odd and even, and always have the gear bellow the active gear selected on the idle side ready to be activated (with some exception for the 1st gear since there isn't a lower gear)? Wouldn't this allow for smooth downshifting? (upshifting doesn't have to be as smooth since for those cases you can count on the vehicle momentum to keep things going)
I'm wondering, could a similar system also be geared to favour speed and acceleration instead of strength? And could it be made efficient enough to outperform a motor without gearbox? I'm afraid such systems still lose power stretching rubber bands.
Beside that, this is a very impressive solution.
it should already do that, as long as the car isn't too heavy
Wouldn't it come down to the same thing? A transmission that shifts down when more torque is required and then shifts back up when it's not?
Brilliant.
Certainly more reliable than a Ford powershift transmission anyway. Maybe Ford can take a few pointers from Lego...
It's AMAZING
Impressive
Genius!
Genius
I am more impressed on how you managed to create a 'resistance sensor' with the rubber band and the lever.
Getting that resistance to select the gears is pretty impressive. Measuring loads by springs (even rubber ones) is old hat !
If this person is not a mechanical engineer - he should be 🙂
@@SirThreepio Why?
Gavin Gynert How dare you question The Klein.
How to make this
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!
omg, those lego technic sets frmo the 90's
@@rupert6478 especially shifting rings lol
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.
Pls like so he can see.
Edit: Yo grammar police chill down, im fqin German
2nd Edit: You could try using the axle connectors with the clicking mechanism instead of the smooth connectors, where the clutch moves freely. Could work too, because the gears kinda click and lock in place and a certain amount of tension is needed to reach the next gear. Replacing one of the axle-connectors should be enough.
I think that another problem is the way the strength is tested, by the elastic circling around a piece... If it was linear more than round, the shifting for the second and first speed won't be so hard...
In lego defender transmission too perfect 90 degree steps.
He already has a stepper build in
@@rolfvanrijckevorsel We got the same profile pic...
Don't confuse "An" and "A" because you only put "an" if the following word starts with a vowel otherwise always use "A" ...don't worry you'll get it at some point
Sariel: I've run out of ideas on how to improve this.
Me: All is lost if this genius cant crack it.
omg he's GOT TO CRACK IT
FOR FUCK'S SAKE I haven't been able to sleep lately. I've just been waiting for SARIEL TO CRACK IT.
WHAT A FUCKIN GENIUS
I've given 2 suggestions for improvements !
@@millomweb wheee
Finally and automatic transmission that works
Still better than a Nissan
Uve been searching the entire internet for this huh? A man of culture, i see.
@@caesar5775 actually yes😂 I have spent many hours searching for and building automatic transmissions and this by far is the best I have seen.
Mini Cooper Nation CVT =/= automatic
Toyota, Subaru, Honda, Volvo, ford(trucks only) all have pretty good automatic tranny's. People just never change the oil
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!
Thank you!
Hi Sariel, are you having an Instagram account belongs to your UA-cam channel? When not it would be cool when you can make one
Me too!
I was since 2014 and I never end to be surprised with his creativity
Bro...
Most people: Look, I made a car out of Lego...
Sariel: I made a self adjusting automatic transmission, it's not perfect can you guys give me ideas on how to perfect it?
The rest of us:... ... This guy made an automatic transmission out of Lego?... Can barely comprehend that let alone help you lol...
Nah but seriously good luck on it, that's a game changer right there...
he just reused and adapted the 15yr old automatic gearbox system. Not a game changer.
pro tips: fake dialogs are ridiculous, everywhere on youtube.
You just said what I have in my mind !
The rest of us : This guy is awesome
Sariel : It's not perfect...
a game changer you say ?
so did it become solitaire ?
These arnt the same kinds of "lego" pieces that you get from your local store. The kind we all grew up with. These are custom made for projects like this. Its basically just plastic made to look like lego. Still neat, but not mind blowing. Now, if he were able to make a working transmission using just standard lego pieces, that would be impressive.
@@SvendleBerries They are real lego peices, idk when you grew up but these gear and beam type lego parts have been in stores since the late 70s.
I've seen auto 'boxes before, but this one has the most potential I feel.
Sariel in 2025: I've made the Koenigsegg Regera transmission from Lego, not really reliable though.
> Creates beautiful automatic downshifting mechanism
...
> Wheel of test vehicle falls off
XD
Funniest comment awarded for being most ironic!
Awesome work as always. What about some sort of centrifugal clutch mechanism? It would be too big, but might work. Or even several clutches with varying degrees of force needed to engage.
In my head it would work backwards, with the least amount of resistance on the output shaft, all four clutches are engaged, as the force builds, the weakest slips, causing the gear ratio change when only 3 clutches ares spinning. Etc etc until only the last clutch has engaged (1st gear) or could even be adjusted to slip to prevent over-stressing the motor?
Grain of salt. I've got ideas in my head but not enough experience (yet) to implement it. I just know I've seen functional clutches in Lego in the past. 🤷♂️
2:23 Just beautiful to see it in action
I'm definitely gonna do some playing around with this idea when I get home, it has some real potential. Nice work!
Hey! Long time viewer, first time comment. Might I suggest moving the shifting mechanism to the input side? It theoretically should be able to keep engaged at all times, and hopefully run smoothly!
I will try and experiment at home with some ideas for making your mechanism smoother, and let you know if I find anything. I built your 3 speed transmission and removed the limiting 5 stud liftarm to allow it to have a "Neutral" position (Needed for a moc I'm working on) but I thought it might be interesting to make it an automatic transmission. I got my parts from lego and built it today, so again when I get more time I'll try and experiment with your automatic trans :)
On a side note, the reason I decided to modify your 3 speed to be 3 + N is because the powerhouse is a Pneumatic Engine made with the lego fake engines. I've come to near perfection with it's design and hope to upload some videos shortly (on alt account) to show it's speed! It's not super torquey but it is fast, faster than most LPE's I've seen, and very compact. (Currently attempting to fit it into the Dom's Dodge Charger, by replacing the V8 inside it with my own. It will hopefully run with the trans in it too!)
Putting the tension system on the input side would result in inaccurate sensing because the shifts would affect the tension then. Every time it shifted down, tension would let off, and it would shift back up, increasing tension, shifting back down, back and forth.
@@keithklassen5320 Yeah, that's more or less the point. I tried it myself and it worked much smoother with shifting because it had a constant input. It did shift up and down, but it was relatively smooth and took a lot of torque off the motor.
My engineering teacher : where did you get those mechanics knowledge?
Me: you wouldn't get it
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!
This is brilliant! I've seen this concept applied to 2-speed transmissions, but I would have never thought about something like this!
As for the stalling in "neutral", maybe the gap between consecutive gears wouldn't be as large if you built a true dual-clutch gearbox? It would probably be a lot bulkier. I know Sheepo built a PDK for his Porsche model, with actual (rubber-based, I think) clutches instead of relying on these transmission rings.
It seems like it doesn't need a "clutch", but exactly the opposite: a lockout to prevent the rubber band from spinning the shift selector backwards while in neutral. The only problem is preventing the lockout from being activated when there is low resistance, so that it can still be able to down shift. Could a one-way freewheel lockout be applied to the transmission side of the resistance measurement differential? It would need to be activated when the resistance is high, but not when the resistance is low... Maybe using an offset phase cam you could lower the lockout lever during shifts to prevent back-spin in neutral? Maybe this could be a second function of the spinning square cam that helps hold it in gear.
@@haphazard1342 the not needing a clutch is partly because the lego motors are so weak relative to their size when compared to car engines. ive done alot of lego with drill motors and i found myself needing clutches alot to help not break parts while shifting or other similar operations in tank transmissions. i also created a "torque converter" out of a swivel base thing filled with bike chain oil that worked well to soften the shock of sudden electric torque.
Wow. This literally blows my mind. I simply wouldn't know where to start!
Who needs porn when you have a Lego "Technic Automatic 4-speed Transmission"
My proudest fap.
@@lukewatson8848 index finger » ok sign
thanks for not disabling comments. youtube thinks that disabling comments and not saying a word that causes demonetization makes the video for kids and disabling the miniplayer
Idea: increace speed in 4 times before 90° speed tester and then decreace in 4 times before exit. You can use other constant instead if 4 but in case of using this idea you should make tester softer in 4 times. This idea will take less time to switch speed
Epic
Never have I seen such detailed videos like this, I just want to say that whatever you are doing keep it up, favorite channel at the moment. Cheers lad. Also tell the hamsters I said hi. :)
I'm kinda torn between being flattered by your comment and offended by your username.
Sariel's LEGO® Workshop whoops forgot to change that heh
Can't wait for 16 speed transmission that's so automatic you don't need to build it
motor: am i a joke to you
You could chain 4 of these suckers together and that could be a 16 speed
@@nicholasfinch4087 actually you only need 2 for 16
@@nicholasfinch4087 that would be a 256 gear trans ,lol...hmm comming to think of it, I wonder how it would behave
I will immediately install this to replace that horrible RoadRanger Tranny in my Peterbilt. Don't care if it voids my warranty. It's Lego.
this is awesome! how about using a different type of rubber band to adjust how much resistance is needed to shift it?
I always thought the resetting would be difficult, turns out just use that mechanism you made. And a rubberband
This just pops up in my recommended
If you combine the CVT transmission with this torque detector, then it would be perfect.
That one downvote is from a LEGO Friends fan
And rest from a duplo fans!
@@Durzy007 dont dis the duplo community they dont take it lightly
This is *AAAAAHUUUUUEEEEENNOOOOOOOO!!1*
Wow, impressive!
When the clutch decouples for shifting down gear, the torque goes to zero and the mechanism goes into shift up mode. There is a delay because the mechanism takes some time to go from down to up shifting. Only when the down shifting is complete before the mechanism is into up shifting mode, the shift is successful.
So a further delay would make downshifting more reliable. It could be done with a directional friction brake on the gear selector wheel.
Or maybe freeze the gear selector in place until the shift has completed.
That was my thought as well.
I thought of that at first as well, but the gear selector is directly linked to the shifter, so if you freeze it or delay it, it also freezes or delays the shift, so it wouldn't work. It only works now because the gear selector can sometimes get enough momentum to go through the whole shift, even though the torque is zero (it helps that there is only a small part in the cycle where it's really decoupled). You would need to either make it easier for it go get the momentum it needs, or decouple the gear selector from the shifter and add some sort of locking mechanism to force it to remain at one of the 4 positions. Then, depending on how you do it, adding the freeze to the gear selector would work. I have no idea how to do all that with lego, though, at least on that size.
Thats realy nice dude
Each mechanism Sariel designs always blows my mind. I never imagined that an automatic transmission could be made from simple LEGO Technic pieces
No slush!?!
I’m not sure if this would work, but if you use weaker rubber bands, the red T joint thing that turns 90 degrees each time it changes gear, the gear change will require less effort hence a smoother change in gears, or just generally use weaker/more stretchy rubber bands, that should allow for the gears to change more smoother, I hope this helps!
I don't think it would work, the speeds would just shift differently
BTW, what's the music? I love it :3
Same! Does anyone know what it is?
Sielent Brat Song name: Bit I Love You by Jincheng Zhang
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.
Just talking out loud here. These are not criticisms. I am just listing out my observations. I am trying to get this straight for myself. Please correctly if I am wrong...
This design is always "wasting/using/diverting" a portion of the motor's power to keep it shifted in gears 3, 2, and 1. The lower the gear, the more power is diverted to the shift mechanism into stretching the rubber band. There is additional motor energy used to separate the locking mechanism when the RED part rotates (1:23). So, even though you have increased the gear ratio to the output, you are effectively using a "weaker" motor. This is a more advanced version of your previous "Lego 2 Speed Automatic Gearbox" (ua-cam.com/video/OtcFXSR33kM/v-deo.html) that required the same sacrifice.
I will build it later, but I can roughly picture the power consumption of the shifting mechanism vs time in my head.
Suggestion:
(2:04) Reduced the rubber band (spring) strength but use 1 or 2 rubber axle connectors (45590) on the wedge belt wheels (4185). The 45590 will be acting as a constant brake on the 4185. I am trying to make the 45590 act like a damper to "hold" the 4185 in place when it is shifting to reduce the chatter you are seeing. The goal would be to pair the right amount of friction from the 45590 and rubber band to require same/similar amount of energy to do a shift but the 45590 could hold it there once it is shifting.
Just an initial idea. Good luck!
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.