+Dan Bossons - That is the Lego L Motor. It was released in 2012 and has been used in about half a dozen sets so far, including this year's Crawler Crane (Set 42042) and Mercedes-Benz Arocs 3245 (Set 42043).
Indeed. This is just a prototype, and improvements can definitely be made. Stalling the output does put a lot of stress on some of the pieces, but at least the gears aren't 'clicking' (clicking is generally a bad thing and means the gears/axles are deforming).
It is the same basic idea, however most bikes with a freewheel system use a ratchet and pawl mechanism, which gives you that distinctive clicking noise when you aren't pedalling.
zandkoek notice how it has two arms that swing out? They also stay in when the motor is off so the tire can free roate. They only engage when the motor spins and if it spins slow enough it wouldn’t engage, just like a go kart clutch
gerbullo crolello everything else is true except for the braking. when he stops the wheel the motor has to stop because there is still torque being applied to the clutch
This is similar to a centrifugal clutch, but not quite the same. With a centrifugal clutch, the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases. With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction). This is more like a sprag clutch.
@@JaceN3D Yes, I think that would work. LEGO pieces, bring made from plastic, are fairly light, so you would have to spend a fair bit of time fine tuning the system.
it kinda isnt a sprag clutch (cause of the gearing) but then again it is, cause the force that presses the sprags outside is still provided by the torque of the input shaft... props :D
Thanks. I haven't built this into a vehicle... yet. If you use this mechanism in a vehicle, please upload a video and send me a link so that I can check it out.
This is similar to a centrifugal clutch, but not quite the same. With a centrifugal clutch, the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases. With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction). This is more like a sprag clutch.
Ah yes exactly. If you were to add rubber bands, springs or cones with balls and a v-shaped belt it would come closer to a centrifugal clutch of course. I hadn't heard of a sprag clutch but I think that's more down to a language barrier. I wonder what it's called in Dutch (looked it up and they call it a sprag clutch or a 'vrijloop' in Dutch).
The motor won't spin the output faster than the input, it simply allows it to spin faster if external forces are applied. Think of it like this: If you pedaling your bike as you encounter a downward hill. You keep pedaling at a steady speed but you are now rolling a lot faster. You realize you don't need to pedal down a hill, so you stop. The pedals (input) is now completly still, but the wheels (output) are allowed to keep turning thanks to the sprag clutch.
OUMT ya but with this design, it won’t free wheel at all like a bike would while you are still peddling. This is really more like a regular clutch but a cone shape
+OUMT is correct. This clutch works based on the difference in speed between the input and the output. If the output is slower than the input, then the rubber shoes engage and the output becomes the same speed as the input. If the output is faster than the input, such as when you stop the input (stop pedalling) or an external force is applied (rolling down a hill), then the rubber shoes disengage, allowing the output to 'free wheel'. It can still 'free wheel' while you are pedalling, as long as the output is going faster than the input.
When the motor is stopped, the wheel is free to spin either forwards or backwards. When the motor is on and spinning forwards, the wheel also spins forwards. When the motor is on and spinning backwards, the wheel is free to spin forwards or backwards again.
This is similar to a centrifugal clutch, but not quite the same. With a centrifugal clutch, the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases. With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction). This is more like a sprag clutch.
nice work i am going to try and incorporate into a dragster racer as part of the pull back force accumulation to deliver a faster start, like holding a car on a hill. thnx
+madcuzbad - Yes and no. The set-up is similar, where the inner rubber 'shoes' are pressed against an outer housing, however in a centrifugal clutch the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases. With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction). It uses the small 8T gears to force the rubber 'shoes' out. Reversing the direction of the input, or allowing the output to spin faster than the input (free wheel) forces the rubber 'shoes' to disengage completely.
look in to that. Found the closet thing to metal Lego was Erector sets stamped out metal with per-drilled holes and screws . Not as kid friendly as Lego. Still handy in life to fix and made many thing
There are stores on Bricklink that do sell metal (aluminum/aluminium) parts that are compatible with Lego. eg: store.bricklink.com/Eezo There are also users on Shapeways selling 3D printed parts that are compatible with Lego, and some of those parts can be printed in metal. eg: www.shapeways.com/designer/efferman/creations Both of these options are a lot more expensive than genuine Lego parts made from ABS plastic. I don't own any of these metal parts, so I cannot comment on their quality at all.
Thanks :-) Adding a reverse gear would be reasonably easy. Instead of having this mechanism go straight to the wheel, add a gearbox between them that lets you select either forwards or reverse.
I’m not an expert so would you explain where this would be useful please not trying to sound sarcastic but I don’t know anything about this sort of thing Cheers mate
Hi Connor - Check the description of the video, it should answer your questions. If you have any further questions that aren't answered, please feel free to ask.
@@connorlever229 if you have a gearbox with a clutch to follow up behind this the motor could still run during a gear change, whilst the wheels are freely spinning, without the motor stopping them, making a manual and auto gearbox more realistic
I don't have instructions for this model. If you study the video closely and are familiar with Lego Technic pieces you should be able to see enough information to recreate this model yourself. Remember that this is just a prototype, so you could also use different pieces to get similar results.
I have not used this mechanism in a car yet. After a discussion on the Eurobricks Forum (www.eurobricks.com/forum/index.php?showtopic=92955), I built this mechanism to test it out in 'real' life, and to show a few changes that I felt improved the design. I had no plans to use this mechanism within another (more complete) model, but I will use this mechanism if I work on a model that calls for it. If you happen to use this mechanism in a car or other Lego model, please post a link so that I can check it out.
Unfortunately Lego is not a cheap hobby. - The cheapest way to get Lego would probably be to find second-hand Lego on eBay or Craigslist (or slmilar) or at local garage/yard sales or op shops/thrift stores (eg. Good Will stores). - The next cheapest option is usually to buy Lego sets with a good 'price per piece' ratio. If you can find a store that has a sale, you can get some good deals. If you are just after a few specific pieces, you will have to balance the number of parts that you want/need in the set versus the other parts in the set/s and determine if this is worth it to you. - If you only want specific pieces, you can order from sites such as BrickLink or BrickOwl. - Lastly, you can order individual pieces directly from the Lego website, but this usually isn't the 'cheap' option. Depending on your location you may be able to rent Lego. Search the web for 'rent Lego' to see various companies that offer this service, Some websites that I use to research Lego sets and pieces are brickset.com, bricklink.com, and rebrickable.com.
S. L. Froden rent legos!! That's insane hahahahhahahahahahhahaah I'm not that broke, honestly I can afford legos, but I'm going to complain about the price the whole time.
A number of life size Lego cars have been made already by other people, including a driveable version of the Bugatti Chiron (www.lego.com/en-us/themes/technic/bugatti-chiron/build-for-real) which used over 1,000,000 Technic pieces and took over 13,000 man-hours to design and build. Unfortunately I don't have 1,000,000 spare Lego pieces of the right type, or the spare 13,000 man-hours that would be required to build a life size Lego car myself.
This is similar to a centrifugal clutch, but not quite the same. With a centrifugal clutch, the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases. With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction). This is more like a sprag clutch.
I don't quite get it. If you reverse the current and have the motor rotate the other way, wouldn't the "clutch pieces" rotate in other direction and still engage the wheel? It seems like the plastic light grey piece that encases the clutch pieces also rotate with the wheel so if the clutch pieces were to spin outwards, wouldn't they engage the grey piece as well? Can you please explain why the wheel only spins in one specific direction and spins freely in the other? I read the article you linked to in the description but I still can't quite understand it. Thanks
+V.T.O.L. Fried Chicken - When the motor spins in one direction, it rotates the two rubber pieces outwards, but they can only rotate so far until they engage with the outer casing, at which point they lock together and the motor's rotation is now transferred to the wheel. When the motor spins in the opposite direction, it rotates the two rubber pieces inwards, which disengages them from the outer casing, and therefore stops transferring the motor's rotation to the wheel, so the wheel is able to spin freely. When the two rubber pieces rotate inwards, they can only rotate so far before they hit the piece in the center, so they can't rotate all of the way around and engage with the outer casing at all, so they remain disengaged until you reverse the direction of the motor again. If they weren't limited by the piece in the center (and they were spaced further apart so they wouldn't hit each other), then they would rotate all the way around and engage with the outer casing again. I hope that explanation helps.
I haven't built this into a 2KG model, so I'm not sure how sturdy it would be. It works quite well, and the only problem is that it is quite large. If you end up using this design, please post a link to your video so that we can see how it works.
+Creep503_TV - In it's current configuration this is more like an anti-brake. If you changed the design you may be able to get this to operate like a drum brake, but I haven't tried it so I'm not 100% sure how it would work.
+Innocentforscratcher - The type of brake that you are describing is called a Coaster Brake, which works a little bit differently to a Sprag Clutch. See en.wikipedia.org/wiki/Bicycle_brake#Coaster_brakes
please show me a farming equipment that uses it(genuinely curious) and youre right. just thought about what happens when you stop a lathe, stops slow not instant.
+Snake322 - There are many examples of sprag clutches for tractors. Here is one: www.agriandgarden.com/sprag-clutch.html That page also lists the tractors that the sprag clutch is compatible with.
slfroden oh btw, can you make 2 looping motor lego generator? i requested this because i haven't seen one before making this. i hope you are reading this and know how its work. and dont forget to use 2 gear, one with the smallest gear (8 tooth) , and one with the biggest gear (i think it was 64 tooth).
Every radio controlled ic car has these , as do most rev and go motorbikes and gas powered gardening tools , nothing new here folks , just well proven old technology !
Yup, this mechanism isn't new (and I didn't come up with the name 'Sprag Clutch' either). However, an interesting challenges is to try and replicate real-world mechanisms using only the limited parts palette available in the Lego system, which is what I have tried to do here. Also, this video may introduce this mechanism to others that haven't seen the mechanism before. It might inspire them to research other similar mechanisms in the real-world, and perhaps design their own mechanisms, whether that be using Lego parts or other technologies.
@@slfroden very true , i did appreciate it being in Lego, and your right , it's sometimes easy to look at things with old eyes and say , this is old tech , but there are those even now that haven't seen this in action , or even worked with tech that uses it , every new way of thinking is a new future of development, i didn't mean it to be criticism, just old eyes seeing this and using this in in a work enviroment for many years, but also in the rc world as a hobby on a daily basis, now everything is electric powered with no need of such clutches , yeah it's a good reminder of things past but also of what could be in the future reworked re-thought and re- used 👍😎
Dominick Stellato Yes and no. The set-up is similar, where the inner rubber 'shoes' are pressed against an outer housing, however in a centrifugal clutch the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases. With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction). It uses the small 8T gears to force the rubber 'shoes' out. Reversing the direction of the input, or allowing the output to spin faster than the input (free wheel) forces the rubber 'shoes' to disengage completely.
+王立煒 - It depends on what you are trying to propel. It you are trying to propel something 'small', it should be able to transfer enough torque. If you are trying to propel something 'huge', then it probably won't be able to transfer the torque, and either this sprag clutch or another part of the drivetrain will fail. I'm not sure exactly how much torque this sprag clutch can transfer before it fails, but in the video it was able to make the tire slip on the rim of the wheel, and it was also able to stall the motor when I halt the output, so it is transferring quite a bit of torque there without failing.
The mechanism in this video is similar to a drum brake in that it has 'shoes' that press against the inner surface of a 'drum', however there is one important difference. Drum brakes are typically engaged by an external input, such as pressing a brake pedal or engaging the parking/emergency brake in a car, whereas the mechanism in this video is engaged when the rotation direction of the input axle changes.
+Clemens Brombeer - If you study the video closely, you should be able to see all of the pieces required. This is just a prototype, so you could use different pieces. Please refer to the Eurobricks forum for more information (link in the video description). If you have a more specific question, please let me know.
The largest Lego 'wheel' that I have is the 'Hailfire Droid Wheel' (part x784) from set 4481. The largest tyre that I have is the 'Power Puller Tyre' (part 32298) from set 8466.
+creepjax - Yes, I guess that you could think of it that way. When the clutch is disengaged, it is in neutral mode, and when the clutch is engaged it is in drive mode.
There is no need to reverse the motor to disengage the clutch. As soon as the output (wheel) is going faster than the input (motor) the clutch will disengage. If the motor is stopped, any rotation of the wheel is faster, and therefore the clutch disengages.
I’m a tad confused. How is this a clutch? It can’t be controlled without modifying the input from the engine. So if you wanted to use it you’d need a transmission to put it into reverse to disengage
From Wikipedia: A clutch is a mechanical device which engages and disengages power transmission especially from driving shaft to driven shaft. en.wikipedia.org/wiki/Clutch There are many different types of clutches that are used in many different types of machines, not just automotive. Not all machines need to reverse the driven shaft, such as bicycles, engine starters, agricultural equipment, helicopters, and lathes. The mechanism in this video most closely resembles a 'sprag clutch'. en.wikipedia.org/wiki/Sprag_clutch
Cool but what's the use of it? I understand why a clutch in forward direction engages and turns the wheel. I understand when motor is off the wheel freespins. But I don't understand why the motor has to be able to turn backwards when it doesn't have to spin the wheel??? It's a serious question, I just don't know if I ask it correct since I'm Dutch speaking... 😊
The motor doesn't have to be able to turn backwards and have the wheel spin freely, but in this implementation it is just how it works. It is the same on a bicycle that has a free wheel mechanism. When you (the motor) turn the pedals forward the chain moves which spins the rear wheel. When you stop pedalling the rear wheel can still spin freely (coasting). When you pedal backwards the rear wheel can also spin freely.
Twist and go mopeds (automatic motorcycle scooters) use a similar clutch mechanism. It improves fuel efficiency that they can freewheel a bit on down slopes or coasting to a stop. So the engine has to be able to disengage, or run slower than the road wheels. Not that you would run the engine backwards but it has that effect. I remember it being called a flywheel clutch but now I know it's proper name. Good demonstration :)
Ohoho, my brain is just so excited to play with Lego Technic for some reason.
I just want to spew all my amazing ideas out.
I like how you show all the pieces as you slowly attach them. Good job!
Wow!!! Absolutely genius design!
This is the kind of clutch found on weedeaters
"comedy in the future will be randomly generated!" Is what this comment reminded me of
imriy FPS* W E E D E A T E R
*centrifugal
Nope
+Dan Bossons - That is the Lego L Motor.
It was released in 2012 and has been used in about half a dozen sets so far, including this year's Crawler Crane (Set 42042) and Mercedes-Benz Arocs 3245 (Set 42043).
Hate when people say: "Needs more work or something to that extent." It's great just how it is and if he needs your expertise, I'm sure he'll ask.
According to my calculations...
1:21 i think this clutch needs a clutch just look at them poor gears
Indeed. This is just a prototype, and improvements can definitely be made.
Stalling the output does put a lot of stress on some of the pieces, but at least the gears aren't 'clicking' (clicking is generally a bad thing and means the gears/axles are deforming).
This is the basic idea of a mountain bike (or any bike with a freewheel system)
It is the same basic idea, however most bikes with a freewheel system use a ratchet and pawl mechanism, which gives you that distinctive clicking noise when you aren't pedalling.
That's the most clever thing I've ever seen! You're a true genius.
Very nice, I had a much larger version, but it did allow large torque transfer. I like this because then brakes on a model are actually useful.
this should be put on lego trains. so we get a more realistic deceleration. and also a better down hill effect
Make your own ! 😁
Excellent, why the 311 dislikes?
Ignore them bud, good work.
Thanks.
People like and dislike different things. 311 dislikes with 750,000+ views isn't too bad though.
this is like a ratchet but using friction instead of gearing so it spins smoothly without any click-clacking
Now this is cool and useful. Awesome dude!
Coolest Lego build I've seen to date! Thanks for posting:)
+seagangsta b - Thanks :-)
This is how go karts work
RetroX no go karts work with a centrifugal clutch, those use centripetal force to engage. This one uses gears to engage
zandkoek notice how it has two arms that swing out? They also stay in when the motor is off so the tire can free roate. They only engage when the motor spins and if it spins slow enough it wouldn’t engage, just like a go kart clutch
@@retrox684 no, it's based on rotation but not rpm. You can see how he spins it manually very slowly and It engages anyway
@@retrox684 too much complicated talk here I will leave
gerbullo crolello everything else is true except for the braking. when he stops the wheel the motor has to stop because there is still torque being applied to the clutch
Cool, lego technic is a great one
So basically the same concept as a centrifugal clutch.
This is similar to a centrifugal clutch, but not quite the same.
With a centrifugal clutch, the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases.
With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction).
This is more like a sprag clutch.
@@slfroden if you put a rubber band on it, will it be a centrifugal clutch? so it has to spin fast enought to le the catches reach out
@@JaceN3D Yes, I think that would work. LEGO pieces, bring made from plastic, are fairly light, so you would have to spend a fair bit of time fine tuning the system.
Perfect for sequential gearboxes.
Very cool. This would be great for a complex motorized bike model.
This is an ingenious idea! Soory for my bad spelling :0
thanks i might use this in my rc Chiron project
Now that’s really cool! Good job man! Would be awesome if you could make something like this in a lego car
This is genius
it kinda isnt a sprag clutch (cause of the gearing) but then again it is, cause the force that presses the sprags outside is still provided by the torque of the input shaft...
props :D
Yeah, it's hard to define exactly what this clutch is, but the definition for a sprag clutch is the closest that I have found so far.
Kind of like my slider (It’s a bike you can sit down in and very low and it’s easier to drift in it)
Nice one . Would like to see more
Thats really nice! Good build! I want to see it built into a vehicle 😊
Thanks. I haven't built this into a vehicle... yet. If you use this mechanism in a vehicle, please upload a video and send me a link so that I can check it out.
What kind of sorcery is this?
That's smart bro
Is it safe to call this a centrifugal clutch? Like the ones you see in semi-automatic clutch mopeds?
This is similar to a centrifugal clutch, but not quite the same.
With a centrifugal clutch, the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases.
With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction).
This is more like a sprag clutch.
Ah yes exactly. If you were to add rubber bands, springs or cones with balls and a v-shaped belt it would come closer to a centrifugal clutch of course. I hadn't heard of a sprag clutch but I think that's more down to a language barrier. I wonder what it's called in Dutch (looked it up and they call it a sprag clutch or a 'vrijloop' in Dutch).
To be honest, I didn't know that it was called a Sprag Clutch either until Connor Cruz pointed it out to me in the comments.
I read the description. How does this allow the output to spin faster than the input? It’s one to one ratio.
I think because the wheel can spin freely and it keeps accelerating a little bit when the motor starts spinning.
Adolf Hitler that’s not gonna allow the output to spin faster than the input.
The motor won't spin the output faster than the input, it simply allows it to spin faster if external forces are applied.
Think of it like this:
If you pedaling your bike as you encounter a downward hill. You keep pedaling at a steady speed but you are now rolling a lot faster. You realize you don't need to pedal down a hill, so you stop. The pedals (input) is now completly still, but the wheels (output) are allowed to keep turning thanks to the sprag clutch.
OUMT ya but with this design, it won’t free wheel at all like a bike would while you are still peddling. This is really more like a regular clutch but a cone shape
+OUMT is correct.
This clutch works based on the difference in speed between the input and the output.
If the output is slower than the input, then the rubber shoes engage and the output becomes the same speed as the input.
If the output is faster than the input, such as when you stop the input (stop pedalling) or an external force is applied (rolling down a hill), then the rubber shoes disengage, allowing the output to 'free wheel'.
It can still 'free wheel' while you are pedalling, as long as the output is going faster than the input.
make actual use of the reverse gear in so many lego transmissions.... and make a reason to include real brakes..... i like it!
So it allows it to spin one way and freely with no power, but reverse does nothing. Interesting.
connect it to a transmission and you'll have an automatic clutch
So when a engine idles it spins backwards??!?
VishousCat ^^^
most likely you'd use an electric motor as you'd need a legit centrifugal clutch for an engine
When the motor is stopped, the wheel is free to spin either forwards or backwards. When the motor is on and spinning forwards, the wheel also spins forwards. When the motor is on and spinning backwards, the wheel is free to spin forwards or backwards again.
All I see is magic.
It can be used for a technic moc and have the engine running but the wheels are not like a handbrake
You dont even know what handbrake does
Isnt this just a centrifugal clutch?
This is similar to a centrifugal clutch, but not quite the same.
With a centrifugal clutch, the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases.
With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction).
This is more like a sprag clutch.
BMX Freecoaster 🤔
Блин, всё видел, но вот центробежное сцепление в Лего вижу в первый раз
Я офигеб если сделают бензатилу
R
Только это не центробежное сцепление, лепестки разворачиваются благодаря шестерням
Я думал я один русский который его смотрит
не один
Nice job!
nice work i am going to try and incorporate into a dragster racer as part of the pull back force accumulation to deliver a faster start, like holding a car on a hill.
thnx
That sounds like a great idea!
Once you have finished your dragster, please take a video and post a link here so that I can check it out.
Cool idea 👍
It's ingeniously!
Nice
Nice
Nice
Zesty_ Sketchz nice
@@linhtuong7908 nice
@@nootaboot7042 noice
これはスゴイ。ってか発想が神がかってる
Awesome idea. Thank you. : )
So, like a centrifugal clutch that only works in one direction?
+madcuzbad - Yes and no.
The set-up is similar, where the inner rubber 'shoes' are pressed against an outer housing, however in a centrifugal clutch the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases.
With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction). It uses the small 8T gears to force the rubber 'shoes' out. Reversing the direction of the input, or allowing the output to spin faster than the input (free wheel) forces the rubber 'shoes' to disengage completely.
Alright, I was more or less trying to keep it simple, but now I know lol
Nice one, think it can withstand the torque of multiple RC buggy motors as well?
they so need to make a metal Lego kits
It wouldn't work. The mating of Lego parts relies on the softness of the ABS. Metals are too hard.
look in to that. Found the closet thing to metal Lego was Erector sets
stamped out metal with per-drilled holes and screws . Not as kid friendly as Lego. Still handy in life to fix and made many thing
There are stores on Bricklink that do sell metal (aluminum/aluminium) parts that are compatible with Lego.
eg: store.bricklink.com/Eezo
There are also users on Shapeways selling 3D printed parts that are compatible with Lego, and some of those parts can be printed in metal.
eg: www.shapeways.com/designer/efferman/creations
Both of these options are a lot more expensive than genuine Lego parts made from ABS plastic.
I don't own any of these metal parts, so I cannot comment on their quality at all.
blackgriffinxx try mechano
Good job!
Tipically drum brakes
Awesome: Freefloating mode for RC cars!
Just the reverse gear to be sorted out😂
Thanks :-)
Adding a reverse gear would be reasonably easy. Instead of having this mechanism go straight to the wheel, add a gearbox between them that lets you select either forwards or reverse.
Very nice! good to know!
I’m not an expert so would you explain where this would be useful please not trying to sound sarcastic but I don’t know anything about this sort of thing
Cheers mate
Hi Connor - Check the description of the video, it should answer your questions. If you have any further questions that aren't answered, please feel free to ask.
Thank you
@@connorlever229 if you have a gearbox with a clutch to follow up behind this the motor could still run during a gear change, whilst the wheels are freely spinning, without the motor stopping them, making a manual and auto gearbox more realistic
@@domenicwilliamson8930 That's what the clutch is for though.
@@harrodharrod5239 yeah I know, I explained in that paragraph up there
Interesting. Is there instructions? I’d like to use that.
I don't have instructions for this model. If you study the video closely and are familiar with Lego Technic pieces you should be able to see enough information to recreate this model yourself. Remember that this is just a prototype, so you could also use different pieces to get similar results.
Great!!! Could we see it in a car?
I have not used this mechanism in a car yet.
After a discussion on the Eurobricks Forum (www.eurobricks.com/forum/index.php?showtopic=92955), I built this mechanism to test it out in 'real' life, and to show a few changes that I felt improved the design.
I had no plans to use this mechanism within another (more complete) model, but I will use this mechanism if I work on a model that calls for it.
If you happen to use this mechanism in a car or other Lego model, please post a link so that I can check it out.
S. L. Froden thanks for the extra info, how could I get legos on the cheap? I'm broke but I want to learn!
Unfortunately Lego is not a cheap hobby.
- The cheapest way to get Lego would probably be to find second-hand Lego on eBay or Craigslist (or slmilar) or at local garage/yard sales or op shops/thrift stores (eg. Good Will stores).
- The next cheapest option is usually to buy Lego sets with a good 'price per piece' ratio. If you can find a store that has a sale, you can get some good deals. If you are just after a few specific pieces, you will have to balance the number of parts that you want/need in the set versus the other parts in the set/s and determine if this is worth it to you.
- If you only want specific pieces, you can order from sites such as BrickLink or BrickOwl.
- Lastly, you can order individual pieces directly from the Lego website, but this usually isn't the 'cheap' option.
Depending on your location you may be able to rent Lego. Search the web for 'rent Lego' to see various companies that offer this service,
Some websites that I use to research Lego sets and pieces are brickset.com, bricklink.com, and rebrickable.com.
S. L. Froden rent legos!! That's insane hahahahhahahahahahhahaah I'm not that broke, honestly I can afford legos, but I'm going to complain about the price the whole time.
Yes.
nice work! Thanks bro ;)
What if you made a life size Lego car???
A number of life size Lego cars have been made already by other people, including a driveable version of the Bugatti Chiron (www.lego.com/en-us/themes/technic/bugatti-chiron/build-for-real) which used over 1,000,000 Technic pieces and took over 13,000 man-hours to design and build.
Unfortunately I don't have 1,000,000 spare Lego pieces of the right type, or the spare 13,000 man-hours that would be required to build a life size Lego car myself.
Kinda like a centerfugal clutch
This is similar to a centrifugal clutch, but not quite the same.
With a centrifugal clutch, the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases.
With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction).
This is more like a sprag clutch.
I don't quite get it. If you reverse the current and have the motor rotate the other way, wouldn't the "clutch pieces" rotate in other direction and still engage the wheel? It seems like the plastic light grey piece that encases the clutch pieces also rotate with the wheel so if the clutch pieces were to spin outwards, wouldn't they engage the grey piece as well?
Can you please explain why the wheel only spins in one specific direction and spins freely in the other? I read the article you linked to in the description but I still can't quite understand it.
Thanks
+V.T.O.L. Fried Chicken - When the motor spins in one direction, it rotates the two rubber pieces outwards, but they can only rotate so far until they engage with the outer casing, at which point they lock together and the motor's rotation is now transferred to the wheel.
When the motor spins in the opposite direction, it rotates the two rubber pieces inwards, which disengages them from the outer casing, and therefore stops transferring the motor's rotation to the wheel, so the wheel is able to spin freely.
When the two rubber pieces rotate inwards, they can only rotate so far before they hit the piece in the center, so they can't rotate all of the way around and engage with the outer casing at all, so they remain disengaged until you reverse the direction of the motor again. If they weren't limited by the piece in the center (and they were spaced further apart so they wouldn't hit each other), then they would rotate all the way around and engage with the outer casing again.
I hope that explanation helps.
wait why is this useful?
not to be rude just wondering
Why is anything LEGO useful
useful for making you Lego car drive better
Check the video description. It has all the information that you need. 😉
Let me know if you still have questions...
I'm thinking about lock version, so a reverse moter direction would be available.
+pif paf Do you mean a lock feature that you can enable and disable as needed? That would be a good idea.
absolutely impressive!
HOW sturdy is it to put into a MOC weighing 2KG's
I haven't built this into a 2KG model, so I'm not sure how sturdy it would be.
It works quite well, and the only problem is that it is quite large.
If you end up using this design, please post a link to your video so that we can see how it works.
So basically how bikes work?
Yeah, a similar principle, just with a slightly different implementation.
i didn't notice i watched this video it in double speed
weird..
Good idea!!
Like one way bearing ain't it?
A Sprag Clutch is a subset of one way bearings, but there are several different types of one way bearings.
At last we won't use back movements never more :D
Can i User this as a brake
+Creep503_TV - In it's current configuration this is more like an anti-brake. If you changed the design you may be able to get this to operate like a drum brake, but I haven't tried it so I'm not 100% sure how it would work.
slfroden ok thx
a compareable mechanism was used for bikes as a brake, that works by kicking back the pedals...
Innocentforscratcher ok thx i have a bike like this XD
+Innocentforscratcher - The type of brake that you are describing is called a Coaster Brake, which works a little bit differently to a Sprag Clutch. See en.wikipedia.org/wiki/Bicycle_brake#Coaster_brakes
old automatic transmissions use it as well but not agricultural equpment or lathes
+Snake322 - A quick Google search provides results that contradict your statement.
please show me a farming equipment that uses it(genuinely curious) and youre right. just thought about what happens when you stop a lathe, stops slow not instant.
+Snake322 - There are many examples of sprag clutches for tractors.
Here is one: www.agriandgarden.com/sprag-clutch.html
That page also lists the tractors that the sprag clutch is compatible with.
how to enforce 1 way lanes
good one, fantastic!
+Atomic Arctic - Thanks :-)
slfroden oh btw, can you make 2 looping motor lego generator? i requested this because i haven't seen one before making this. i hope you are reading this and know how its work. and dont forget to use 2 gear, one with the smallest gear (8 tooth) , and one with the biggest gear (i think it was 64 tooth).
+Atomic Arctic - I'm not sure what a '2 looping motor Lego generator' is. Can you provide some more information or a link?
Cool idea!
this has technic in it
Im sure he meant that the "Free Wheel" is lego technic.
You just earned a like and a sub ;P
+KKGamer 1610 - Thanks :o)
Really, great mech!
Nutral and drive
what has a free wheel for function?
+Joran Prins - Please refer to the video description.
oops, sorry no wi know
Which motor is that? Sorry about the necro.
+Dan Bossons L motor
Cheers
Thats cool plz do a how to vid
+Aidan Burns - I thought that this was a 'how to' video...?
Every radio controlled ic car has these , as do most rev and go motorbikes and gas powered gardening tools , nothing new here folks , just well proven old technology !
Yup, this mechanism isn't new (and I didn't come up with the name 'Sprag Clutch' either).
However, an interesting challenges is to try and replicate real-world mechanisms using only the limited parts palette available in the Lego system, which is what I have tried to do here.
Also, this video may introduce this mechanism to others that haven't seen the mechanism before. It might inspire them to research other similar mechanisms in the real-world, and perhaps design their own mechanisms, whether that be using Lego parts or other technologies.
@@slfroden very true , i did appreciate it being in Lego, and your right , it's sometimes easy to look at things with old eyes and say , this is old tech , but there are those even now that haven't seen this in action , or even worked with tech that uses it , every new way of thinking is a new future of development, i didn't mean it to be criticism, just old eyes seeing this and using this in in a work enviroment for many years, but also in the rc world as a hobby on a daily basis, now everything is electric powered with no need of such clutches , yeah it's a good reminder of things past but also of what could be in the future reworked re-thought and re- used 👍😎
Not every
@slfroden This is basically a centrifugal clutch right?
Dominick Stellato Yes and no.
The set-up is similar, where the inner rubber 'shoes' are pressed against an outer housing, however in a centrifugal clutch the clutch engagement is based on the RPM of the input, and it engages more as the RPM increases.
With the set-up shown in the video, the clutch engages based on the rotation direction of the input rather than the RPM (the RPM are still a factor, but not as much as the rotation direction). It uses the small 8T gears to force the rubber 'shoes' out. Reversing the direction of the input, or allowing the output to spin faster than the input (free wheel) forces the rubber 'shoes' to disengage completely.
his can be to the lego krimes ! cool swing!!
nice
Is its torque be too small?
+王立煒 - Too small for what?
slfroden Propulsion（Sorry,my english is not very good）
+王立煒 - It depends on what you are trying to propel. It you are trying to propel something 'small', it should be able to transfer enough torque. If you are trying to propel something 'huge', then it probably won't be able to transfer the torque, and either this sprag clutch or another part of the drivetrain will fail. I'm not sure exactly how much torque this sprag clutch can transfer before it fails, but in the video it was able to make the tire slip on the rim of the wheel, and it was also able to stall the motor when I halt the output, so it is transferring quite a bit of torque there without failing.
Thank you for the explanation.
Why do you need it?
Please read the video description.
If you still have any questions, please let me know.
Its simalar to a snow machine clutch
So when the motor stops spinning in something like a car, the wheels don’t lock up
Do it’s drum breaks?
The mechanism in this video is similar to a drum brake in that it has 'shoes' that press against the inner surface of a 'drum', however there is one important difference. Drum brakes are typically engaged by an external input, such as pressing a brake pedal or engaging the parking/emergency brake in a car, whereas the mechanism in this video is engaged when the rotation direction of the input axle changes.
Genius👍👍
bardzo mi się podoba
+Jan Garwol - Translation: 'I like it very much'
Thanks. :-)
How to do ?
+Clemens Brombeer - If you study the video closely, you should be able to see all of the pieces required. This is just a prototype, so you could use different pieces. Please refer to the Eurobricks forum for more information (link in the video description). If you have a more specific question, please let me know.
What kind of wheel
This model is a prototype. You can use any Lego wheel and tyre that you like.
S. L. Froden ok so what is the biggest wheel you have tell me what set it was from
The largest Lego 'wheel' that I have is the 'Hailfire Droid Wheel' (part x784) from set 4481. The largest tyre that I have is the 'Power Puller Tyre' (part 32298) from set 8466.
where can you find the piece
+Joshua fajardo - Which piece are you referring to?
I buy most of my Lego from Lego.com or BrickLink.com
I guess he refers to the light bluish gray wheel with 7 pin holes, which often appears in the StarWars sets, very seldom appears in the technic sets
neutral mode?
+creepjax - Yes, I guess that you could think of it that way. When the clutch is disengaged, it is in neutral mode, and when the clutch is engaged it is in drive mode.
Nice 👍😊👍☺️
Good idea but you gotta do something about having to reverse the motor to disengage the clutch
Great idea though
There is no need to reverse the motor to disengage the clutch. As soon as the output (wheel) is going faster than the input (motor) the clutch will disengage. If the motor is stopped, any rotation of the wheel is faster, and therefore the clutch disengages.
I’m a tad confused. How is this a clutch? It can’t be controlled without modifying the input from the engine. So if you wanted to use it you’d need a transmission to put it into reverse to disengage
From Wikipedia:
A clutch is a mechanical device which engages and disengages power transmission especially from driving shaft to driven shaft.
en.wikipedia.org/wiki/Clutch
There are many different types of clutches that are used in many different types of machines, not just automotive. Not all machines need to reverse the driven shaft, such as bicycles, engine starters, agricultural equipment, helicopters, and lathes.
The mechanism in this video most closely resembles a 'sprag clutch'.
en.wikipedia.org/wiki/Sprag_clutch
Think of it like the clutch in a chainsaw
its like clutched bearings, bicycle clutches, or freewheel clutches in 60's cars.
Fliehkraftkuppkung oder Variomatik.
Cool but what's the use of it? I understand why a clutch in forward direction engages and turns the wheel. I understand when motor is off the wheel freespins. But I don't understand why the motor has to be able to turn backwards when it doesn't have to spin the wheel??? It's a serious question, I just don't know if I ask it correct since I'm Dutch speaking... 😊
The motor doesn't have to be able to turn backwards and have the wheel spin freely, but in this implementation it is just how it works.
It is the same on a bicycle that has a free wheel mechanism. When you (the motor) turn the pedals forward the chain moves which spins the rear wheel. When you stop pedalling the rear wheel can still spin freely (coasting). When you pedal backwards the rear wheel can also spin freely.
Twist and go mopeds (automatic motorcycle scooters) use a similar clutch mechanism. It improves fuel efficiency that they can freewheel a bit on down slopes or coasting to a stop. So the engine has to be able to disengage, or run slower than the road wheels. Not that you would run the engine backwards but it has that effect. I remember it being called a flywheel clutch but now I know it's proper name. Good demonstration :)
Good
how does this work?
Everything you need to know is in the video and the video description. ;-)