kzbin.info/www/bejne/bKHRdmyVpcZ3Z9Esi=tVgddcxjlABcV_Ct Zundapp 😅

This is almost like the old Zundap gearboxes ☺️

Fantastic video👍🏻

Genius gearbox design! I’ve been thinking forever there’s gotta be a better to switch gears rather than trying to slam gear engagement dogs into square edged holes at speed.

Can you please link to the patent or post the patent number??? 👍

My kind of nerd. Awesome video dude.

You earned my subscription with this video. Now how about a cvt transmission without a belt or chain!

Amazing video! I was an engine builder for KTM USA motocross and know first hand that very few people @ the Factory in Austria have ever seen 1st hand the Seamless box and like everything in F1/MotoGP very $$$$

Hey tommy any way I could contact you? Im working on a time attack rc car project and I'm after a 4-8 speed transmission based off of already designed rc 2/3 speed tranmsiions (auto)

Its insane how this whole assembly is press-fit together, meaning you can't just mix and match gears from one set to another. In the 2027 regulations, the number of gearsets is reduced from 24 to 16... and i would imagine they have spares aswell

You could show Simson gearbox. It is moped from DDR from 70´s - 80´s :)

Waaw, i wondered for a long time how the manufacturers managed this, now it is crystal clear. This is a genius invention! Thanks for your informative content video Sir!

Oh look, an over engineered riding lawn mover transmission.

I believe the GMA T50s uses the same model of the XTrac Seamless shift because Gordon indicated it had no dog rings and clutches or forks, so it has to be this type. Gordon tried to put it in the T33 but realised it was a bad idea and withdrew it. But does this kind of gearbox last long?

I can't believe someone combined the mechanism of a multicolored ball point pen, a bicycle like freewheeling mechanism with a spring loaded set of levers mounted inside the gears to create this gearbox! This is the second generation seamless shift gearbox patented by Honda with no shift forks either as per their published paper. Only when I saw a working model of it do I finally get it how it is really done! Dang, engineering is cool!

That's awesome. Now add the driving gears and a hand crank to represent the engine. Also a sprocket to the "wheel" and you can make the whole process visible and potentially tangible to less technically minded people...just a thought. Amazing job thou, weldone!

A man after my own heart

I have a couple of questions : 1) Why is it called "seamless"? 2) Making this gearbox must have been a considerable effort. Why did you do it? I don't suppose it will be used to drive anything with any real weight. Was it for an education lecture? I must say, it's beautifully made! I had a Lambretta many years ago that used a similar gearbox - though not identical. It was a bit simpler in concept.

This is how some multi grear rc car gears are made. But they are not "shifted" the purple "dogs" are spring loaded and when rpm overcomes the spring the dogs are alowed to move and engage a different gear. I have seen similar designs and there is always so much stress of the dogs that they shear or shear the teeth off the inside of the gear. Its a bad ass design. Hope it hold up well for them.

Would you share the CAD for this? Awesome

I feel like you could simplify this by using pneumatic activation and plumbing the gas through the shaft. Then you move an inner sleeve to port the gas to actuate pistons to actuate the levers

Damn, you did that all in one take... I'm trying a KZbin video rn and just the intro took me a bazilion takes

Zündapp did this simmilar a long time ago kzbin.info/www/bejne/b4alZmB3p91sg5Y

34:58 why not have a tube instead of rods ? A tube with holes in it is much more robust

25:56 😂 pretty cool

Seems like the shift rods would be a weak point here. I wonder if it is a common failure.

This is actually far more complex than an automatic car transmission.

Ok so you did all this in 10 hours? Insane. I couldn't print 1 gear in 10 hours.

This reminds me very much of the 2 and 3 Speed gearbox engagement mechanism used in many Nitro RC cars of the past. The biggest difference between being that the RC models used a "automatic" centrifugal engagement to shift gears instead of the shift rod mechanism. Interesting stuff

Good video! Very good work with the 3D-print and explanation!

Impressive you got such a complex design working from 3D printed parts

This was a brilliant video, u should see old F1 seamless gear box too it was a simple solution not as complex like this mechanism ,they used a double shifter barrel with internal parts exactly like a motorcycle gear box which has a single shifter barrel. And one barrel had odd and the other had even gears and both barrels were linked with each gear having a small angle offset i think 25⁰ . I think tractor trailer gear box were first to build quick gear change gear boxes.

Awesome, you did it 👍👍

Very nice job! I think of the Sachs ball-detent transmission on steroids. This design could be an electronic transmission. Super interesting. Thank you! I’m a new subscriber.

The part about how the gear naturally stays engaged until the next gear relieves pressure on it (causing the previous gear to disengage fully) is brilliant; it reminds me of how lockpicking applies tension to a core by rotating it which allows the pins to bind up against the sides of the housing so that they remain in position despite no upwards pressure from a key. I don't really understand how this works in both directions though; it makes sense that shifting one way would relieve pressure by rotating faster than the previous gear, but in the reverse direction wouldn't the slower gear always lag and never engage? Is it because that gear effectively drives in "reverse" briefly (applying pressure to the deceleration levers) which ultimately has the same effect of briefly unloading the previous gear before resuming forward rotation?

Need to pick uptime pace ... way too long

Amazing video! I have worked with many transmission but never seen seamless stuff like this. Very clever engineering and VERY clever reverse engineering by you. 👍

Hmm, can you say 1950's Vespa...

looks like there are more than 13 pages there - 15 at least.

Cool design. Do you have ASD?

I do not know what is more genius. Inventing this gearbox or being able to reverse engineer this from only patent drawings. Keep up the good work 👍

My brother had a 1962 or 3 Tohatsu 50 street bike that that had a similar system except it used a ball-bearing sphere instead of the dogs(?) that are used here.

Although what your doing is very interesting however your explanation is all over the place and is very difficult to follow for those of us who don’t understand what is going on🤷

Pretty cool that you built this just from patent drawings, I dont know if you are aware of this but in the motorcycle drag racing world we have been using what we can an over ride transmission for over 40 years, shifts with no power cut, but only for up shifts as we don't need down shifts in drag racing

I wasted some 14 minutes while you blabbed on about your 3D printed gears without explaining much. Then about at 14 minutes you finally reveal the internal "dog clutches" inside the gears.Your whole video could have been 5-10 minutes explaining a "crash box" transmission.with the dog clutches on the inside of the gears instead of the faces like most "crash boxes". Driver 61 shows a F1 crash box transmission and how it works. As a "teacher" you would put most students to sleep in a few minutes. I told KZbin to NOT RECOMMEND your channel.

Would be cool to post the STL files after you’re done just so some of us could have a model of our own. Awesome work!

I'm curious if Honda, or any other team, ever experimented doing this with a centripetal clutch, instead of using cammed dogs. If they're already rebuilding these every race, why not explore other methods. So much complexity with the timing mechanism could be taken out by just changing to clutches, not to mention you could hypothetically push much more power through the clutch mechanism than you can with two pivoted dogs; essentially moving potential failure points from those diving pivots to at what point the clutches slip or what the teeth of the gear can handle. The same kind of selector would probably be used, a cam mech with previous gear retention, though given the radial nature of centripetal clutches it'd probably be simple to use a radial action on the selector. This would also be cool to adapt to a hydraulic system to replace the cam selector just a series of valves and pressure differences determining which clutch pack engages, imagine throwing this into a kart and just having shifter paddles; though this quickly becomes just one step away from just an automatic transmission. I almost want to see this scaled up for use as a sequential in a car. Surely reliability would go up with scale, beefier components and more room within the package to provide robustness.

I just gained 10iq points from watching this. Thank you so much. Excellent presentation!

I can tell they've got parts of the idea from other inventions too. Looks similar to a bicycle hub freewheel, but that only works in one direction and there's no shift. Thanks for showing the details as I was curious about this. It's definitely a lot more complex than the zero shift system which reduces components but is very similar to the usual synchronous gearbox.

Stermey Archer used a similar, principle