This is interesting, and I agree with some of the other comments, lets make a bulletproof version to handle the torque, horsepower, and weight of a go-kart and or minibike, and dont make it so it barely does the job, understand that we are all crazy and always look for ways to make our engines more powerfull, if 5 hp is the average , make the IVT to handle 15 -20 hp, get it dunn, I want one !
@MrZorrack Believe me, I know what people do to boost their motor power; I was once a hot rod. The 1st version SIVAT will be too small to handle 15-20 hp, but a larger version will likely follow.
dude less talk try a video of this while your son rides the bike - end all the hyper chat and show us a bicycle with the unit installed - all the talk is BS
@rentatrip1 That's the plan. Step 2 is moving forward. A real, installed SIVAT will be demo'd as soon as we get the new design proto built, tested & videoed.
@thunder996 There's an excellent chance! The new SIVAT is being spec'd to handle 2 hp (~1500 watts) at 90 rpm input; if it handles the higher input test speed of an engine at >300 rpm, it should also accomodate about 6 hp from an engine. That will be tested within months.
@tomterahedrob The cost will depend on volume, so it will drop as it becomes more widely used. It will be featured in higher end products first as an OEM replacement for other transmissions, but the goal is $500-$900 as a stand-alone, standardized product. The 3X top ratio will be good for small wheel vehicles without a need for huge front sprockets.
@tomterahedrob You heard right...kinda. A clean, freshly lubed, well-aligned chain drive is 98% efficient. Derailleurs drop that efficiency down by 3-6 points by deliberately misaligning the chain for most ratios. The SIVAT gear combinations figure about 94% efficiency, dropping down to 88% in very low ratios. A more important consideration is the ergonomic effect of regulated cadence resulting from pedaling in the best ratios; 85-95 rpm being optimal for most riders.
@mrmihov85 As a teenager, I'd race a friend around the block riding like that! We'd go all out on speed & do many laps, scaring automobile drivers. It was fun! Thanx for the memories.
@THEMAKER888 Our plan is to offer the option for a hub! Yes. The new design will be very versatile with a common core for different applications. Very few parts will be different between apps.
so you move a handle to get it to change gears.....right so where's the automatic part. a cvt changes ratio by it self all i see is a new trans that you have to change the ratio by hand nice but not auto sorry
Jan 17th @ 1:25am & I just "liked" this video up to a thousand "likes" ... Its the best I can do!
Aaaany waaaayyyyy... interesting! I had a Honda 360 w/auto trans... it was probably something like this? I wonder if...by now...you have transcended the need to work for the rest of your this lifetime?... anything exciting happen in the past 4 years
@9tee Thanx # 1000! It's been just over 3 years, and yes I've had many various offers, the latest being very attractive. The SIVAT will be used in several products soon & get development funding to make it into a single universal design that can be used in several ways for several apps sometime next year!
@herbienbrian2 That will be possible next year. Imagine not only eliminating your clutch, but also having many gear ratios! What's your horsepower (or wattage) rating?
@herbienbrian2 Thanx. The design I'm working on might handle that; I haven't gotten to the power budget review yet, but this is beefier than the 1500 watt (2 hp) version that was abandoned in favor of some changes required to make it more universal. We'll test the new design prototype for power capacity within a few months, and I'll post the results here. OK?
@SIMKINETICS ahhhh toushe, but yes you are absolutely right the FIA banned it before it could get on track. But your invention looks very promising! i would like to have it on my bike!
@everythingman987 Senna hated the technologies that automated the skilled actions of drivers; the triumph of his competitive philosophy largely won out about the same time of his tragic death. With more F1 focus on safety since, Senna was the last great to die racing.
As for bikes, the next round of development should result in tests to perfect a compact bike SIVAT for MTB's & lesser breeds in about a year! I really want this in bikes too!
@SIMKINETICS senna hated these technologies because his skill was so far in front of everyone else. and in 1994 he said Benetton and Micheal Schumacher were cheating because they had traction control. and when F1 focused on safty after senna's deth, it created the most ugly f1 cars ever, ergo the ferrari 310 with the HUGE side head protection. and eventually slicks were banned too. glad they're back even though pirelli sucks.
@everythingman987 Yeah. I'm with Senna on most of that...he had a right to honor his own skills. After all, F1 racing is about raw driving ability above all else. Thanx for your insights.
@everythingman987 The IVT has infinite ratio range by virtue of its ability to always reach extremely low ratios (including zero) even when all its ratios are raised by step-up gearing. CVT's have limited range, usually <4X from high to low regardless of any step-up or step-down. Although IVT theory isn't terribly complex, its real-world implementation is non-trivial. Wikipedia has a fair description of this distinction under 'CVT' or 'Transmission'.
@hwfanatic Notice the ratio-control lever & rubber band? These will be replaced with a similar device with a stiff spring instead of a rubber band that pushes the ratio-control toward high gear ratios until input torque rises enough to compress the spring through reaction, forcing the SIVAT to lower its output speed while the input speed remains constant. See 5:10 to 5:15 to notice how that works. This action will increase output torque as needed to ascend hills of variable grade.
@hwfanatic Thank you for your cogent argument, but until I see that output turning faster than the input it will always be a clutch to me. Nice colour though.
@clake10000 See my response to wiktorioss, 5 days ago. A clutch is a dynamic friction device that wastes power & causes wear during its transition to & from disengagement between input & output. The SIVAT never disengages, is based on variable leverage, and transitions in speed ratio with very little wear & wasted power. To assume that it's a clutch because it can act like a clutch is a sweeping generalization, a logical fallacy.
@Downhilltrails Not yet. I'm anxious to try it soon on an MTB. The upcoming development of the SIVAT will result in a new video to demonstrate its achievement.
if my understanding is correct, with this transmission you can keep on accelerating with out the engine's power or rpm going down. that mean 100% intput from 0 to top speed, right? please correct me if im wrong.
@janMirage98 You are correct! Your engine will be able to maintain its maximum power & efficiency throughout the speeds of your vehicle with the SIVAT!
@Direwolf56 There's a good chance that the SIVAT will be featured in a few products this year. I'm working on a design that will be easily adapted to pedal-crank input, wheel-hubs, & typical motorized uses. The new design will have highly enhanced torque capacity, bi-directional input & a top output ratio >3X. This will likely be available next year for users & product manufacturers who want to use it their own way. The business details are now in-process.
main problem i have with this is that its on the rear end.This thing looks like it weighs a tonne if i was gunna have this on my bike i'd want it as low and close the bb as possible. it would completely ruin the ride of a bike if placed on the rear end, needs to be built into a frame!
@jamesarthurjfa I agree. The SIVAT won't be too heavy, but I'll still put it up front at the BB. The rear wheel & dropouts will have less mass than current bikes because there will be only 1 small rear sprocket and no derailleur!
@SIMKINETICS i'd love to try it out, i can see the future of mountain biking in this, if you want some to do a long term test i'd be happy to do it for you ;-) cool work man
I think its useless for bicycle, it just works like clutch (and clutch is useless in bicycles), and the ratios you are showing are from 1:0 to 1:1 in any other types of mechanics maybe this will work but for me its just another patent for clutch
@wiktorioss Yes, a clutch is useless for a bicycle. No, this is not a clutch. When you start pedaling, it will not be in the lowest ratio or zero. Take note that the video demo uses a 55T/11T combo for final high ratios well above 1:1. BTW, the new design will have an internal top ratio > 3:1, so a large chainwheel is not required to achieve MTB-like high ratios of 4:1 or higher; a single 22T/16T sprocket combination will work fine for all ratios you'll ever need.
@SIMKINETICS but as i see in the film the wheel will never rotate faster then pedals and thats the biggest problem, in normal bike the pedals make 1 rotation and wheel should make much more rotation
@wiktorioss You're not seeing the whole picture... literally. The pedal crank rotates 1 turn for every 5 turns you see at the SIVAT input! The chain drive in the video is a 55T/11T combo. Regardless, the new SIVAT output will spin >3 times its own input; this was mentioned in other recent comments.
@SIMKINETICS I'm sorry but as I see it's still just a clutch but for much bigger gear on chain than we can use normaly. so it shouldnt be called transmission. Let us forget about the chain but we say that the input big rotary part does 1 rotation, and now the question: can that part that is regulated by lever rotate faster then the input part? if no, it,s just mechanical clutch, if yes, I'm sorry but you haven't explained it.
@wiktorioss I did explain that the new design maximum output will be >3 times faster than its input! Regardless, even if it only regulates ratios below 1:1, it is still a transmission. Your calling it a clutch does not make it a clutch. A clutch is a dynamic friction device, which the SIVAT is not. I use the American English definition of the term 'transmission', which is equivalent to 'gearbox'; the SIVAT fits that definition perfectly.
@SIMKINETICS This is a great idea. The advantages for mt. bike- more ground clearance from smaller front sprocket, quick adjustments for climbing, no vulnerable derailer and a sealed unit that is safe from mud and dirt. No added weight is good, but unsprung weight is worse. I would encourage the bottom bracket unit. I'm sure the battle between strength and weight is challenging.
When do you think a bicycle application will hit the market?
@MrWebberman Thanx for your comments. Your insights are exactly along the lines of my thoughts for MTB's. The BB version is the design I'm pursuing; riding even a hard-tail with a massive hub just doesn't feel nimble, so up front it goes! Yes, the strength-to-weight ratio is very important & difficult to balance in design. The SIVAT will debut in non-bike apps this year, but the bicycle SIVAT should follow in about one year.
This little device is ingenious! Good work! I hope you can find investors to put it to good use. I don't know much about mechanical stuff (my expertise is more with electrical experimentation), so I don't understand exactly how it works, and how you can get a zero ratio. How does it "slip" like that, while still being engaged? I know that a torque converter uses hydraulic coupling, but I can't understand how your transmission works! I guess that's still a trade secret though, huh? ;)
@ct92404 Thanx! The SIVAT is now on its way to becoming a real product with investment for development & use as a component. The new design is modular, so it can be used for various applications using simple adapters. It will debut this year!
1) If you mean two separate SIVAT's, it is possible to synch their ratio shifts in parallel by linking their shift actuators with a geared (or levered) jack-shaft; auto operation would average their response.
2) The current SIVAT development is based on modularity with course sizing increments based on power throughput. The first module will be rated at 1500 watts, about the size in the video. The next module size ~6 kW, 6" dia X 5" long.
@thanx4help It's called a SIVAT. The modular design I'm currently working on will be easily adapted either to fitting inside a wheel hub, or outside the wheel with chain drive, or by crank-input as on bicycle bottom-brackets.
@TiagoTiagoT A wheelie? Since there's a slight delay in ratio response, the rider would likely succeed at first, but would not be able to sustain the wheelie unless he overrode the automatic feature. We'll add your excellent question to our array of tests!
Barry, 3 years and no updated video, but frequent comments… I am suspicious your original videos are a fake device with made up descriptions and explanations. Do you post more recent videos in other places? If real, do you intend for this to be a toy for the wealthy and priced out of the 99% (like the "ErockIT")? Or do you intend to be competitive with a sub $500 price range?
@ThreeDigitIQ I empathise with your concern. Remember that patience is a virtue, and here it is being rewarded in these times of tight money that delay progress for innovators. This invention is real, and is recently given credibility with real support to become a product. Be assured that my goal is to provide something useful for all, not a toy for a few. Like most new ideas, it will need to take advantage of economy-of-scale to become affordable & publicised.
@welshray1 Only one at the pedal crank will do the job, and it will move its mass to a better location for more responsive handling on the bike. My most recent concept will provide a compact design with very high top ratios without using a large front chainwheel.
@4godaddygo Indeed! The SIVAT will act like hydrostatic & hydrodynamic transmissions, but with much greater efficiency. Motorcycles & scooters will benefit from the SIVAT. Say goodbye to the crude clutch belt & centrifugal clutch!
great invention...but i have to say.. that the reason of transmission (one of them) is go faster with less efford, so you don´t pull the stick up to see if you can get more torke power with less efford. thanks.
This is an interesting, well presented video and nicely finished prototype IVT. In 1980 I joined a team of researchers at the University of Bath (UK) studying CVTs under contract to the Leyland truck & bus group and the UK Government Department of Industry. We studied hydrostatic and frictional CVTs with brake-energy recuperation. One lecturer developed and patented a CVT with finite ratio range for bikes, with a chain-wheel of variable radius controlled by a torque-sensitive feedback system.
so would this sit inside of the rear hub or replace it alltogether? also if i understand correctly say you were riding a bike equipped with this technology, youwere sitting down while pedaling. Then, you decide you want to go faster and stand up and with out couching any kind of mechanism started pedaling harder it would react to the added force and adapt to it by automaticly changing the ratio thus the faster you pedal the (lower/higher? not to good with this stuff) the ratio would become?
@KingOfKhaos1991 If you put more force into any bike's pedals on level ground, you'll accelerate & go faster, and soon will be pedaling faster unless you change to a higher gear ratio. The SIVAT will automatically raise the gear ratio in that case. Conversely, if you're going uphill, the SIVAT will lower the ratio as the hill slows you down when you keep pedaling with excessively high force. The goal is to keep you pedaling at nearly constant speed & force, regardless.
I have invented an IVT. The oscillation is a problem with the ratcheting types of CVTs. That isn't going to be an issue with my design. It isn't a ratcheting design and doesn't fit in any known category. I started from scratch. Not keen on the overload mechanism. Mine is designed to have a very specific gear ratio depending on the adjustment of the control system. Interested to learn from Youtubers how the marketing process is evolving now through the Internet.
@1waymaster Interesting. I've gained a lot of knowledge about these technologies & related marketing. Send me a message to my inbox for further discussion.
@hihihelloimvanny Yes you can! This will require your patience because the SIVAT concept needs some perfection to become a product that you can acquire. We're working on that now!
@bevaroni A group of us looked at wind turbine applications about 2 years ago. The results were encouraging. HAWT's can use the SIVAT for the following; AC synchronization to grid, wind-gust protection, IGBT elimination, broadened dynamic range, enhanced efficiency. Wind turbines are huge, but we must start out small for other applications before developing for them. EPRI knows about the SIVAT. This is very technical, but your question has been already researched; good question!
if the patent is original tech then it will be something new for automobiles not just bikes...wait...looks like he's getting to that part he just said it too
@codyfranta No. The front chainwheel would be larger than the rear sprocket for normal operation; this would be 49T/13T with the front chainwheel center slightly raised above the bottom bracket center for enhanced ground clearance and chain-tightening ability. This will offer high gear similar to typical MTB's, and low gears lower than the 22T/34T combination.
@murzik94 Yes. What makes the SIVAT automatic is a spring that reacts to torque to change the ratio; notice how it reacts to the tension of the rubber band.
So if I'm understanding this correctly(which I think I am), you have created a flux capacitor for a bicycle. I don't know anyone who can ride a bike at 88 miles an hour though, so I don't think it will work.
Can you show us it's guts? I want to know! I like the concept of a ratcheting type transmission, I just cant imagine one that is durable AND smooth at low speeds. Hope it makes you rich.
@DontFlag Wow! Thanx! I had many hours of hard thinking, resulting in many headaches for years on this SIVAT project. Sometimes hard work is better than inspiration. But the two together are worth their marriage.
@Rorzzer123 NuVinci is a CVT with 3.6X ratio range;SIVAT is an IVT with unlimited range. MTB's currently have 6.2X ratio range, so the SIVAT would be more suitable for them because it meets & expands this range. Also, only the SIVAT is automatic.
If it has overload protection, what do you do if you are going up a steep slope? Get off and push? It looks as a good idea though. Keep working on it.
@alakazamchu The SIVAT will remain fully engaged in the very low gear ratios for uphill riding. You'll be able to pedal up the steepest hills unless you're towing a Buick.
@SIMKINETICS can you maybe do a 3D presentation on how dose it exactly work ? if that dosen't interfere with your design secrets or something like that
@SIMKINETICS i've subscribed, so i can see the animation when you get your patent :)
I'm very interrested in various engineering, and am studying computer engineering, but i still love looking at various mechanical engineering concepts.
How large would a pair of IVTs like this and a flywheel have to be for a recumbent bicycle or other (single user) HPVs for use as regenerative breaking which can be used to assist in hills etc later (or to charge a small battery for LP electronics)?
@gulllars Hmm. My son is working on a PhD in computer engineering, & is an ME. You can see his 'Egg Brake' for bikes on line. You might have something in common.
Regarding FES for bikes, think about the mass. Regenerative braking only makes sense for large, heavy vehicles, either flywheel or electrical-based.
@SIMKINETICS those egg brakes looked interresting. I'm not a competitive cyclist, but rather use my bike as transportation and exercise combined or just for exercise.
I'm Norwegian, and our landscape has lots of small and large hills, and i live in a mostly urban enviroment (though there's also 5-10K stretches of country road around good for cycling). I was thinking of FES more for 5-15sec 500-1500W burst potential being loaded by breaking (75kg @ ~10m/s) or slow loading (50-200W?).
@gulllars Understood. Still, such an FES would be massive for a bike, not likely worth the extra payload you'd have to haul around. However, the burst concept has much merit for larger vehicles!
@SIMKINETICS my quick calculations say a FES with capacity of 4 KJ (enough to accelerate/decelerate me (75) + bike (5) + itself (5?) to roughly 7 m/s or lift about 5 m) could be done with a 2,5 kg flywheel given a center of mass radius of 20cm @ 19K RPM.
The FES coud be fitted next to the rear wheel, but i'm not very familiar with FES design and how the rotational speed tollerances of such small units would be, or if 5kg total will be unrealisticly low for 4KJ (i sense it may be).
@gulllars The raw physics does work for vehicles of certain size, such as with motorcycles & larger vehicles. As a long-time bicyclist, I cannot appreciate FES as a benefit that would offset its additional mass; bicycling is largely an aesthetic experience that relies on the kinesthetic charms of lightweight maneuverability, its greatest hallmark. However, the SIVAT alone for bikes is likely attractive.
This time around (april) i went for a merida "road racer" type bike without the horns, because of avalibility and price (and also convenience in urban areas and short trips), but i was strongly concidering a recumbent bike, as i enjoy 10-40k country road rides.
Would the SIVAT also be good for recumbent bikes (or HPVs), and what is your oppinion of them? I've looked into them a bit, and i'd love to hear an experienced engineer's view :)
@gulllars Yes, the SIVAT will be available for recumbents. I'm currently designing a version for vehicles for a client with similar products, likely to be introduced within months.
My client & I agree that the riding position is not as ergonomically optimal for recumbents as it is for bikes. However, recumbents offer a unique experience that some find interesting & refreshing.
We consider the next application for SIVAT to be for conventional bicycles, following this development.
This is a very interesting hub you have designed, my hats off to you. I could apply such a device to so many aplications it makes my mouth water at such man gizmos. I first checked this video out way back when it was first posted years ago, and I was wondering how this project has progressed. Do you have any news or updates on this device? Cheers, IC
Can you override the over-load protection? That works to protect a motor or other mechanical devices but you do not want (?) in a bicycle application.
Absolutely outstanding feller. What's the big imperative in making it fit a standard hub? Why not make it bigger to be more robust, then surely the hubs will follow. Everyone will want this.
@5656bigsteve Thank you. The SIVAT will be re-located to the front (chainwheel) with enough capacity for robust motorized use. This solution allows for a simple lightweight rear wheel that's more responsive to bumps & divots in the MTB experience!
@SIMKINETICS . Brilliant! Congratulations on your achievement. I've thought for sometime that an automatic gear box for a bicycle must surely be do-able and I'm surprised I haven't seen the like before. Might have had a go myself but like all good ideas.....Great craftmanship on the prototype. I can't imagine how many thousands of Dollars you must have spent to get this far, what with construction and patent protection and all. I hope you make several fortunes.
@nssurge OK. The price is up to the manufacturer, but it will likely be competitive with Rohloff at first, and lowered over time. We want the SIVAT to be very affordable, which it can be, due to its relative simplicity.
@misium Note that the sprocket combination is 55T/11T, so the system ratio is nearly 5:1. The product design will include an internal gear-up so that the front sprocket will be smaller than 55T while achieving such high ratios.
@HighTyner No. Actually, several decades of ardent bicycling & tinkering with bike transmissions led me here! My first was a 45-speed in 1963; followed by a 63-speed, 81-speed, 378-speed, automatic traction CVT & ratcheting CVT. In 48 years, I've only killed 4 trees & 2 baby seals to get here!
@1991Dalina Not yet, but I did try out its predecessor CVT on an MTB. That worked quite well, but needed more range. This SIVAT is being re-designed for upcoming MTB use.
2 questions. Does this transmission work to increase rotation if the drive chain is applied to the gear on the side we are looking at? another words, apply the drive chain to the side with the tape, to spin the other side faster? I'm working on a different project this may be just what I need.
Q for your project: in real world use, what is the lever attached to to measure resistance for automatic adjustment?
@waterkeeper03 The input & output are not reversible; for high gear ratios, the input or output to or from the SIVAT may be geared up though. The ratio lever reacts to throughput torque, so it does 'measure' resistance in effect. Please send further inquiry to my YT in-box.
This is interesting, and I agree with some of the other comments, lets make a bulletproof version to handle the torque, horsepower, and weight of a go-kart and or minibike, and dont make it so it barely does the job, understand that we are all crazy and always look for ways to make our engines more powerfull, if 5 hp is the average , make the IVT to handle 15 -20 hp, get it dunn, I want one !
MrZorrack 1 day ago
@MrZorrack Believe me, I know what people do to boost their motor power; I was once a hot rod. The 1st version SIVAT will be too small to handle 15-20 hp, but a larger version will likely follow.
SIMKINETICS 17 hours ago
dude less talk try a video of this while your son rides the bike - end all the hyper chat and show us a bicycle with the unit installed - all the talk is BS
rentatrip1 1 day ago
@rentatrip1 That's the plan. Step 2 is moving forward. A real, installed SIVAT will be demo'd as soon as we get the new design proto built, tested & videoed.
SIMKINETICS 17 hours ago
if this becomes popular for bicycles, do you think there would be chance for a version that could handle a 3-6hp bicycle mounted engine bolted to it?
thunder996 1 day ago
@thunder996 There's an excellent chance! The new SIVAT is being spec'd to handle 2 hp (~1500 watts) at 90 rpm input; if it handles the higher input test speed of an engine at >300 rpm, it should also accomodate about 6 hp from an engine. That will be tested within months.
SIMKINETICS 1 day ago
This is a very good idea
69stringibanez 3 days ago
Thaks great info.How much will it cost and does it have the ratios for small wheel bikes like the Moultons?
tomterahedrob 3 days ago
@tomterahedrob The cost will depend on volume, so it will drop as it becomes more widely used. It will be featured in higher end products first as an OEM replacement for other transmissions, but the goal is $500-$900 as a stand-alone, standardized product. The 3X top ratio will be good for small wheel vehicles without a need for huge front sprockets.
SIMKINETICS 3 days ago
good
ashraf9472 4 days ago
I heard a chain is 98% efficient.How efficient is this?
tomterahedrob 4 days ago
@tomterahedrob You heard right...kinda. A clean, freshly lubed, well-aligned chain drive is 98% efficient. Derailleurs drop that efficiency down by 3-6 points by deliberately misaligning the chain for most ratios. The SIVAT gear combinations figure about 94% efficiency, dropping down to 88% in very low ratios. A more important consideration is the ergonomic effect of regulated cadence resulting from pedaling in the best ratios; 85-95 rpm being optimal for most riders.
SIMKINETICS 4 days ago
2:05
evertonretrogeek 5 days ago
watch ``Mihov Bojan bicycle reverse driving``
mrmihov85 6 days ago
@mrmihov85 As a teenager, I'd race a friend around the block riding like that! We'd go all out on speed & do many laps, scaring automobile drivers. It was fun! Thanx for the memories.
SIMKINETICS 5 days ago
Pretty amazing! It's good to see that one doesn't need to be Japanese to invent clever stuff :)
poolehart 6 days ago
Will the it bu used as the hub its self?
THEMAKER888 1 week ago
@THEMAKER888 Our plan is to offer the option for a hub! Yes. The new design will be very versatile with a common core for different applications. Very few parts will be different between apps.
1
SIMKINETICS 1 week ago
so you move a handle to get it to change gears.....right so where's the automatic part. a cvt changes ratio by it self all i see is a new trans that you have to change the ratio by hand nice but not auto sorry
steelfoot427 1 week ago
@steelfoot427 See my response to hwfanatic, 2 days ago.
SIMKINETICS 1 week ago
Jan 17th @ 1:25am & I just "liked" this video up to a thousand "likes" ... Its the best I can do!
Aaaany waaaayyyyy... interesting! I had a Honda 360 w/auto trans... it was probably something like this? I wonder if...by now...you have transcended the need to work for the rest of your this lifetime?... anything exciting happen in the past 4 years
9tee 1 week ago
@9tee Thanx # 1000! It's been just over 3 years, and yes I've had many various offers, the latest being very attractive. The SIVAT will be used in several products soon & get development funding to make it into a single universal design that can be used in several ways for several apps sometime next year!
SIMKINETICS 1 week ago
I'd love to have something like this for a gocart rather then a dinky centrifugal clutch.
herbienbrian2 1 week ago
@herbienbrian2 That will be possible next year. Imagine not only eliminating your clutch, but also having many gear ratios! What's your horsepower (or wattage) rating?
SIMKINETICS 1 week ago
@SIMKINETICS
nothing more then a 3hp Briggs.
real light duty single person setup.
herbienbrian2 1 week ago
@herbienbrian2 Thanx. The design I'm working on might handle that; I haven't gotten to the power budget review yet, but this is beefier than the 1500 watt (2 hp) version that was abandoned in favor of some changes required to make it more universal. We'll test the new design prototype for power capacity within a few months, and I'll post the results here. OK?
SIMKINETICS 1 week ago
@SIMKINETICS
sounds great, looking forward to it, subscribed to!
herbienbrian2 1 week ago
The IVT was used by the Williams formula 1 team in 1993.
everythingman987 1 week ago
@everythingman987 The FW15C used a CVT, not an IVT; and only in testing.
SIMKINETICS 1 week ago
@SIMKINETICS ahhhh toushe, but yes you are absolutely right the FIA banned it before it could get on track. But your invention looks very promising! i would like to have it on my bike!
everythingman987 1 week ago
@everythingman987 Senna hated the technologies that automated the skilled actions of drivers; the triumph of his competitive philosophy largely won out about the same time of his tragic death. With more F1 focus on safety since, Senna was the last great to die racing.
As for bikes, the next round of development should result in tests to perfect a compact bike SIVAT for MTB's & lesser breeds in about a year! I really want this in bikes too!
SIMKINETICS 1 week ago
@SIMKINETICS senna hated these technologies because his skill was so far in front of everyone else. and in 1994 he said Benetton and Micheal Schumacher were cheating because they had traction control. and when F1 focused on safty after senna's deth, it created the most ugly f1 cars ever, ergo the ferrari 310 with the HUGE side head protection. and eventually slicks were banned too. glad they're back even though pirelli sucks.
everythingman987 1 week ago
@everythingman987 Yeah. I'm with Senna on most of that...he had a right to honor his own skills. After all, F1 racing is about raw driving ability above all else. Thanx for your insights.
SIMKINETICS 1 week ago
@SIMKINETICS no problem :) but this ivt.....what's the difference from a cvt?
everythingman987 1 week ago
@everythingman987 The IVT has infinite ratio range by virtue of its ability to always reach extremely low ratios (including zero) even when all its ratios are raised by step-up gearing. CVT's have limited range, usually <4X from high to low regardless of any step-up or step-down. Although IVT theory isn't terribly complex, its real-world implementation is non-trivial. Wikipedia has a fair description of this distinction under 'CVT' or 'Transmission'.
SIMKINETICS 1 week ago
@SIMKINETICS thank you for explaining! but too bad wikipedia is down :(
everythingman987 1 week ago
@everythingman987 just got owned
er6415 1 week ago
@er6415 you did? well I really feel honored that you shared the fact you just got owned by replying to MY comment!
everythingman987 1 week ago
I think what he has invented is called a "clutch". You get them in manual transmission cars.
clake10000 2 weeks ago
@clake10000 Wrong!
SIMKINETICS 1 week ago
Looks interesting, but I don't see which part of it is automatic. Please elaborate or point me to an earlier discussion.
hwfanatic 2 weeks ago
@hwfanatic Notice the ratio-control lever & rubber band? These will be replaced with a similar device with a stiff spring instead of a rubber band that pushes the ratio-control toward high gear ratios until input torque rises enough to compress the spring through reaction, forcing the SIVAT to lower its output speed while the input speed remains constant. See 5:10 to 5:15 to notice how that works. This action will increase output torque as needed to ascend hills of variable grade.
SIMKINETICS 1 week ago
@SIMKINETICS Looking forward to seeing it on an actual bike one day.
hwfanatic 1 week ago
@hwfanatic I think that will happen later this year! Bikes are a major goal.
SIMKINETICS 1 week ago
@hwfanatic Thank you for your cogent argument, but until I see that output turning faster than the input it will always be a clutch to me. Nice colour though.
clake10000 1 week ago
@clake10000 See my response to wiktorioss, 5 days ago. A clutch is a dynamic friction device that wastes power & causes wear during its transition to & from disengagement between input & output. The SIVAT never disengages, is based on variable leverage, and transitions in speed ratio with very little wear & wasted power. To assume that it's a clutch because it can act like a clutch is a sweeping generalization, a logical fallacy.
SIMKINETICS 1 week ago
This is amazing work!!!!
Riot454di 2 weeks ago 2
hey, i do downhill mounting biking and i am very interested in this. have u managed to put it in a bike hub yet? please reply
Downhilltrails 2 weeks ago
@Downhilltrails Not yet. I'm anxious to try it soon on an MTB. The upcoming development of the SIVAT will result in a new video to demonstrate its achievement.
SIMKINETICS 2 weeks ago
@SIMKINETICS hey thanks for the info, when u have the finished product, i would love to try it out in a race and spread the word about your product.
Downhilltrails 2 weeks ago
Could I put one of these on a go kart? If so I would REALLY love one!
punchmaster123 2 weeks ago
@punchmaster123 Yes!
SIMKINETICS 2 weeks ago
if my understanding is correct, with this transmission you can keep on accelerating with out the engine's power or rpm going down. that mean 100% intput from 0 to top speed, right? please correct me if im wrong.
janMirage98 2 weeks ago
@janMirage98 You are correct! Your engine will be able to maintain its maximum power & efficiency throughout the speeds of your vehicle with the SIVAT!
SIMKINETICS 2 weeks ago
@SIMKINETICS Will you be selling this anytime soon?
Direwolf56 2 weeks ago
@Direwolf56 There's a good chance that the SIVAT will be featured in a few products this year. I'm working on a design that will be easily adapted to pedal-crank input, wheel-hubs, & typical motorized uses. The new design will have highly enhanced torque capacity, bi-directional input & a top output ratio >3X. This will likely be available next year for users & product manufacturers who want to use it their own way. The business details are now in-process.
SIMKINETICS 1 week ago
main problem i have with this is that its on the rear end.This thing looks like it weighs a tonne if i was gunna have this on my bike i'd want it as low and close the bb as possible. it would completely ruin the ride of a bike if placed on the rear end, needs to be built into a frame!
jamesarthurjfa 2 weeks ago
@jamesarthurjfa I agree. The SIVAT won't be too heavy, but I'll still put it up front at the BB. The rear wheel & dropouts will have less mass than current bikes because there will be only 1 small rear sprocket and no derailleur!
SIMKINETICS 2 weeks ago
@SIMKINETICS i'd love to try it out, i can see the future of mountain biking in this, if you want some to do a long term test i'd be happy to do it for you ;-) cool work man
jamesarthurjfa 2 weeks ago
I think its useless for bicycle, it just works like clutch (and clutch is useless in bicycles), and the ratios you are showing are from 1:0 to 1:1 in any other types of mechanics maybe this will work but for me its just another patent for clutch
wiktorioss 2 weeks ago
@wiktorioss Yes, a clutch is useless for a bicycle. No, this is not a clutch. When you start pedaling, it will not be in the lowest ratio or zero. Take note that the video demo uses a 55T/11T combo for final high ratios well above 1:1. BTW, the new design will have an internal top ratio > 3:1, so a large chainwheel is not required to achieve MTB-like high ratios of 4:1 or higher; a single 22T/16T sprocket combination will work fine for all ratios you'll ever need.
SIMKINETICS 2 weeks ago
@SIMKINETICS but as i see in the film the wheel will never rotate faster then pedals and thats the biggest problem, in normal bike the pedals make 1 rotation and wheel should make much more rotation
wiktorioss 2 weeks ago
@wiktorioss You're not seeing the whole picture... literally. The pedal crank rotates 1 turn for every 5 turns you see at the SIVAT input! The chain drive in the video is a 55T/11T combo. Regardless, the new SIVAT output will spin >3 times its own input; this was mentioned in other recent comments.
SIMKINETICS 2 weeks ago
@SIMKINETICS I'm sorry but as I see it's still just a clutch but for much bigger gear on chain than we can use normaly. so it shouldnt be called transmission. Let us forget about the chain but we say that the input big rotary part does 1 rotation, and now the question: can that part that is regulated by lever rotate faster then the input part? if no, it,s just mechanical clutch, if yes, I'm sorry but you haven't explained it.
wiktorioss 2 weeks ago
@wiktorioss I did explain that the new design maximum output will be >3 times faster than its input! Regardless, even if it only regulates ratios below 1:1, it is still a transmission. Your calling it a clutch does not make it a clutch. A clutch is a dynamic friction device, which the SIVAT is not. I use the American English definition of the term 'transmission', which is equivalent to 'gearbox'; the SIVAT fits that definition perfectly.
SIMKINETICS 2 weeks ago
@SIMKINETICS This is a great idea. The advantages for mt. bike- more ground clearance from smaller front sprocket, quick adjustments for climbing, no vulnerable derailer and a sealed unit that is safe from mud and dirt. No added weight is good, but unsprung weight is worse. I would encourage the bottom bracket unit. I'm sure the battle between strength and weight is challenging.
When do you think a bicycle application will hit the market?
MrWebberman 2 weeks ago
@MrWebberman Thanx for your comments. Your insights are exactly along the lines of my thoughts for MTB's. The BB version is the design I'm pursuing; riding even a hard-tail with a massive hub just doesn't feel nimble, so up front it goes! Yes, the strength-to-weight ratio is very important & difficult to balance in design. The SIVAT will debut in non-bike apps this year, but the bicycle SIVAT should follow in about one year.
SIMKINETICS 2 weeks ago
This little device is ingenious! Good work! I hope you can find investors to put it to good use. I don't know much about mechanical stuff (my expertise is more with electrical experimentation), so I don't understand exactly how it works, and how you can get a zero ratio. How does it "slip" like that, while still being engaged? I know that a torque converter uses hydraulic coupling, but I can't understand how your transmission works! I guess that's still a trade secret though, huh? ;)
ct92404 2 weeks ago
@ct92404 Thanx! The SIVAT is now on its way to becoming a real product with investment for development & use as a component. The new design is modular, so it can be used for various applications using simple adapters. It will debut this year!
SIMKINETICS 2 weeks ago
I am building a steam car with custom motor and axle. This would work great at the transmission for it I just have a few question.
1) is there a way to make two shift at the same time? (side by side not working off each other)
2) is it possible to get them in a slightly bigger size?
ttwixxxx 3 weeks ago
@ttwixxxx Answers:
1) If you mean two separate SIVAT's, it is possible to synch their ratio shifts in parallel by linking their shift actuators with a geared (or levered) jack-shaft; auto operation would average their response.
2) The current SIVAT development is based on modularity with course sizing increments based on power throughput. The first module will be rated at 1500 watts, about the size in the video. The next module size ~6 kW, 6" dia X 5" long.
SIMKINETICS 3 weeks ago
how do you put the sinbad or what ever on a wheel i wanna do this
thanx4help 3 weeks ago
@thanx4help Simkin i think lol
thanx4help 3 weeks ago
@thanx4help It's called a SIVAT. The modular design I'm currently working on will be easily adapted either to fitting inside a wheel hub, or outside the wheel with chain drive, or by crank-input as on bicycle bottom-brackets.
SIMKINETICS 3 weeks ago
I'm having a hard time doing the simulation in my head; what would happen if the rider tried to pop a wheelie from a standing start?
TiagoTiagoT 3 weeks ago
@TiagoTiagoT A wheelie? Since there's a slight delay in ratio response, the rider would likely succeed at first, but would not be able to sustain the wheelie unless he overrode the automatic feature. We'll add your excellent question to our array of tests!
SIMKINETICS 3 weeks ago
Barry, 3 years and no updated video, but frequent comments… I am suspicious your original videos are a fake device with made up descriptions and explanations. Do you post more recent videos in other places? If real, do you intend for this to be a toy for the wealthy and priced out of the 99% (like the "ErockIT")? Or do you intend to be competitive with a sub $500 price range?
ThreeDigitIQ 1 month ago
@ThreeDigitIQ I empathise with your concern. Remember that patience is a virtue, and here it is being rewarded in these times of tight money that delay progress for innovators. This invention is real, and is recently given credibility with real support to become a product. Be assured that my goal is to provide something useful for all, not a toy for a few. Like most new ideas, it will need to take advantage of economy-of-scale to become affordable & publicised.
SIMKINETICS 1 month ago
Im thinking a push bike with 2 of these one in the pedal crank and one in the hub of the back wheel?....
welshray1 1 month ago
@welshray1 Only one at the pedal crank will do the job, and it will move its mass to a better location for more responsive handling on the bike. My most recent concept will provide a compact design with very high top ratios without using a large front chainwheel.
SIMKINETICS 1 month ago
@SIMKINETICS Sounds like a good idea to me mate...
There are so many things that could be done with this if you can make it stronger and durable.
I would love to see it fitted to a large motorcycle replacing the gearbox.
The cluch lever would become redundent or you could move the rear brake up to there instead.
There would be no need for foot controls at all if you connect your product to a twist grip on the left handlebar.
ATV and other off roaders would lap it up im sure...
welshray1 1 month ago
@welshray1 You are reading my mind!
SIMKINETICS 1 month ago
@SIMKINETICS like a motrcycle enginetransmisson,great alternative to the clutch belt like on scooters ,yep like hydrostatic also
4godaddygo 1 month ago
@4godaddygo Indeed! The SIVAT will act like hydrostatic & hydrodynamic transmissions, but with much greater efficiency. Motorcycles & scooters will benefit from the SIVAT. Say goodbye to the crude clutch belt & centrifugal clutch!
SIMKINETICS 1 month ago
this would be very interesting if it were machined as a bicycle hub. or even on larger, more durable scales, a motorbike wheel hub.
spazamatron934 1 month ago
@spazamatron934 That's part of the plan. The design I'm working on is spec'd at 1500 watts, or ~2 hp.
SIMKINETICS 1 month ago
great invention...but i have to say.. that the reason of transmission (one of them) is go faster with less efford, so you don´t pull the stick up to see if you can get more torke power with less efford. thanks.
ramyax 1 month ago
how the hell these automatic transmitions work?
mapukmapuk 1 month ago
@mapukmapuk I don't know... just got lucky.
SIMKINETICS 1 month ago
@SIMKINETICS lol? you built it or bought it?
mapukmapuk 1 month ago
@mapukmapuk Invented it, designed it, built it.
SIMKINETICS 1 month ago
@SIMKINETICS very nice! but i still dont understand how it works lol nvm, i better go done my homemade dirt bike lol
mapukmapuk 1 month ago
This is an interesting, well presented video and nicely finished prototype IVT. In 1980 I joined a team of researchers at the University of Bath (UK) studying CVTs under contract to the Leyland truck & bus group and the UK Government Department of Industry. We studied hydrostatic and frictional CVTs with brake-energy recuperation. One lecturer developed and patented a CVT with finite ratio range for bikes, with a chain-wheel of variable radius controlled by a torque-sensitive feedback system.
gaudeamus66 1 month ago
@gaudeamus66 Thanx! The predecessor to the SIVAT was a bike-mounted & tested automatic CVT that proved torque-responsive shifting is the way to go!
SIMKINETICS 1 month ago
so would this sit inside of the rear hub or replace it alltogether? also if i understand correctly say you were riding a bike equipped with this technology, youwere sitting down while pedaling. Then, you decide you want to go faster and stand up and with out couching any kind of mechanism started pedaling harder it would react to the added force and adapt to it by automaticly changing the ratio thus the faster you pedal the (lower/higher? not to good with this stuff) the ratio would become?
KingOfKhaos1991 1 month ago
@KingOfKhaos1991 If you put more force into any bike's pedals on level ground, you'll accelerate & go faster, and soon will be pedaling faster unless you change to a higher gear ratio. The SIVAT will automatically raise the gear ratio in that case. Conversely, if you're going uphill, the SIVAT will lower the ratio as the hill slows you down when you keep pedaling with excessively high force. The goal is to keep you pedaling at nearly constant speed & force, regardless.
SIMKINETICS 1 month ago
@SIMKINETICS okay thanks for clairifying!
KingOfKhaos1991 3 weeks ago
i want to see people riding it! :(
NsFPeAcE 1 month ago
I have invented an IVT. The oscillation is a problem with the ratcheting types of CVTs. That isn't going to be an issue with my design. It isn't a ratcheting design and doesn't fit in any known category. I started from scratch. Not keen on the overload mechanism. Mine is designed to have a very specific gear ratio depending on the adjustment of the control system. Interested to learn from Youtubers how the marketing process is evolving now through the Internet.
1waymaster 1 month ago
@1waymaster Interesting. I've gained a lot of knowledge about these technologies & related marketing. Send me a message to my inbox for further discussion.
SIMKINETICS 1 month ago
Cool, can i have one? :)
hihihelloimvanny 1 month ago
@hihihelloimvanny Yes you can! This will require your patience because the SIVAT concept needs some perfection to become a product that you can acquire. We're working on that now!
SIMKINETICS 1 month ago
I'm wondering how this transmission could be applied to a windmill?
bevaroni 1 month ago 15
@bevaroni A group of us looked at wind turbine applications about 2 years ago. The results were encouraging. HAWT's can use the SIVAT for the following; AC synchronization to grid, wind-gust protection, IGBT elimination, broadened dynamic range, enhanced efficiency. Wind turbines are huge, but we must start out small for other applications before developing for them. EPRI knows about the SIVAT. This is very technical, but your question has been already researched; good question!
SIMKINETICS 1 month ago
if the patent is original tech then it will be something new for automobiles not just bikes...wait...looks like he's getting to that part he just said it too
lostbuffalo 1 month ago
So you could run a 25 tooth chainwheel on the bike and have a huge driver on the wheel, and it would feel normal?
codyfranta 1 month ago
@codyfranta No. The front chainwheel would be larger than the rear sprocket for normal operation; this would be 49T/13T with the front chainwheel center slightly raised above the bottom bracket center for enhanced ground clearance and chain-tightening ability. This will offer high gear similar to typical MTB's, and low gears lower than the 22T/34T combination.
SIMKINETICS 1 month ago
Well, looks like a clutch to me, let's see that animation of yours...
iLoveEatingPie 1 month ago
@iLoveEatingPie It's not a clutch. I'd be glad to show the animation if that wouldn't spoil the patent process.
SIMKINETICS 1 month ago
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TheExNews 1 month ago
hooray for CVTs!
SalubeXify 1 month ago
but it`s not automatic...
murzik94 1 month ago
@murzik94 Yes, it's automatic.
SIMKINETICS 1 month ago
@SIMKINETICS but aren`t you changeing the rpm with the stick hanging down there?
murzik94 1 month ago
@murzik94 Yes. What makes the SIVAT automatic is a spring that reacts to torque to change the ratio; notice how it reacts to the tension of the rubber band.
SIMKINETICS 1 month ago
Can it do > or = 1:1?
aimre 1 month ago
@aimre Yes.
SIMKINETICS 1 month ago
So if I'm understanding this correctly(which I think I am), you have created a flux capacitor for a bicycle. I don't know anyone who can ride a bike at 88 miles an hour though, so I don't think it will work.
Jayson745 1 month ago
Congratz really nice advance I really would like to have one :D
Beni10PT 1 month ago
So it's an adjustable centrifugal clutch.
CamoPeng 1 month ago
@CamoPeng Nope. It is a transmission.
SIMKINETICS 1 month ago
But can it blend?
WingsofRetribution 1 month ago
nice fingers - BUT how does it work???
photofreaksk 1 month ago
Can you show us it's guts? I want to know! I like the concept of a ratcheting type transmission, I just cant imagine one that is durable AND smooth at low speeds. Hope it makes you rich.
DontFlag 1 month ago
@DontFlag Wow! Thanx! I had many hours of hard thinking, resulting in many headaches for years on this SIVAT project. Sometimes hard work is better than inspiration. But the two together are worth their marriage.
SIMKINETICS 1 month ago
the nuvinci CVT is pretty good, how does yours compare?
Rorzzer123 1 month ago
@Rorzzer123 NuVinci is a CVT with 3.6X ratio range;SIVAT is an IVT with unlimited range. MTB's currently have 6.2X ratio range, so the SIVAT would be more suitable for them because it meets & expands this range. Also, only the SIVAT is automatic.
SIMKINETICS 1 month ago
if output ratio decrees for example 5 times will output momentum increase 5 times?
smqzbq 1 month ago
If it has overload protection, what do you do if you are going up a steep slope? Get off and push? It looks as a good idea though. Keep working on it.
alakazamchu 2 months ago
@alakazamchu The SIVAT will remain fully engaged in the very low gear ratios for uphill riding. You'll be able to pedal up the steepest hills unless you're towing a Buick.
SIMKINETICS 1 month ago
Why don't you make it faster ? like an inpute output ratio of 5 to 1 ?
DarkStyler94 2 months ago
@DarkStyler94 The ratio range will offer a lower low & a higher high than current MTB's in the SIVAT re-design.
SIMKINETICS 2 months ago
@SIMKINETICS can you maybe do a 3D presentation on how dose it exactly work ? if that dosen't interfere with your design secrets or something like that
DarkStyler94 2 months ago
@DarkStyler94 When the patent is issued, a 3D animation will be posted on YT.
SIMKINETICS 2 months ago 15
@SIMKINETICS i've subscribed, so i can see the animation when you get your patent :)
I'm very interrested in various engineering, and am studying computer engineering, but i still love looking at various mechanical engineering concepts.
How large would a pair of IVTs like this and a flywheel have to be for a recumbent bicycle or other (single user) HPVs for use as regenerative breaking which can be used to assist in hills etc later (or to charge a small battery for LP electronics)?
gulllars 1 month ago
@gulllars Hmm. My son is working on a PhD in computer engineering, & is an ME. You can see his 'Egg Brake' for bikes on line. You might have something in common.
Regarding FES for bikes, think about the mass. Regenerative braking only makes sense for large, heavy vehicles, either flywheel or electrical-based.
SIMKINETICS 1 month ago
@SIMKINETICS those egg brakes looked interresting. I'm not a competitive cyclist, but rather use my bike as transportation and exercise combined or just for exercise.
I'm Norwegian, and our landscape has lots of small and large hills, and i live in a mostly urban enviroment (though there's also 5-10K stretches of country road around good for cycling). I was thinking of FES more for 5-15sec 500-1500W burst potential being loaded by breaking (75kg @ ~10m/s) or slow loading (50-200W?).
gulllars 1 month ago
@gulllars Understood. Still, such an FES would be massive for a bike, not likely worth the extra payload you'd have to haul around. However, the burst concept has much merit for larger vehicles!
SIMKINETICS 1 month ago
@SIMKINETICS my quick calculations say a FES with capacity of 4 KJ (enough to accelerate/decelerate me (75) + bike (5) + itself (5?) to roughly 7 m/s or lift about 5 m) could be done with a 2,5 kg flywheel given a center of mass radius of 20cm @ 19K RPM.
The FES coud be fitted next to the rear wheel, but i'm not very familiar with FES design and how the rotational speed tollerances of such small units would be, or if 5kg total will be unrealisticly low for 4KJ (i sense it may be).
gulllars 1 month ago
@gulllars The raw physics does work for vehicles of certain size, such as with motorcycles & larger vehicles. As a long-time bicyclist, I cannot appreciate FES as a benefit that would offset its additional mass; bicycling is largely an aesthetic experience that relies on the kinesthetic charms of lightweight maneuverability, its greatest hallmark. However, the SIVAT alone for bikes is likely attractive.
SIMKINETICS 1 month ago
@SIMKINETICS i concede to that argument :)
This time around (april) i went for a merida "road racer" type bike without the horns, because of avalibility and price (and also convenience in urban areas and short trips), but i was strongly concidering a recumbent bike, as i enjoy 10-40k country road rides.
Would the SIVAT also be good for recumbent bikes (or HPVs), and what is your oppinion of them? I've looked into them a bit, and i'd love to hear an experienced engineer's view :)
gulllars 1 month ago
@gulllars Yes, the SIVAT will be available for recumbents. I'm currently designing a version for vehicles for a client with similar products, likely to be introduced within months.
My client & I agree that the riding position is not as ergonomically optimal for recumbents as it is for bikes. However, recumbents offer a unique experience that some find interesting & refreshing.
We consider the next application for SIVAT to be for conventional bicycles, following this development.
SIMKINETICS 4 weeks ago
which manufacturer have you paired up with (that's not a secret I hope)?
y2kenh 2 months ago
@y2kenh The manufacturer wouldn't want to reveal this yet.
SIMKINETICS 2 months ago
This is a very interesting hub you have designed, my hats off to you. I could apply such a device to so many aplications it makes my mouth water at such man gizmos. I first checked this video out way back when it was first posted years ago, and I was wondering how this project has progressed. Do you have any news or updates on this device? Cheers, IC
IcechickenSr 2 months ago
@IcechickenSr Thanx! The next gen is now in the re-designing process for an MTB company.
SIMKINETICS 2 months ago
Can you override the over-load protection? That works to protect a motor or other mechanical devices but you do not want (?) in a bicycle application.
tecnocato 2 months ago
@tecnocato You can override the protection, but it won't be necessary for bikes because of a very high torque tolerance on them.
SIMKINETICS 2 months ago
@SIMKINETICS In the video you showed the bicycle hub. Have you published the finished bicycle wheel?
tecnocato 2 months ago
Absolutely outstanding feller. What's the big imperative in making it fit a standard hub? Why not make it bigger to be more robust, then surely the hubs will follow. Everyone will want this.
5656bigsteve 2 months ago
@5656bigsteve Thank you. The SIVAT will be re-located to the front (chainwheel) with enough capacity for robust motorized use. This solution allows for a simple lightweight rear wheel that's more responsive to bumps & divots in the MTB experience!
SIMKINETICS 2 months ago
@SIMKINETICS . Brilliant! Congratulations on your achievement. I've thought for sometime that an automatic gear box for a bicycle must surely be do-able and I'm surprised I haven't seen the like before. Might have had a go myself but like all good ideas.....Great craftmanship on the prototype. I can't imagine how many thousands of Dollars you must have spent to get this far, what with construction and patent protection and all. I hope you make several fortunes.
5656bigsteve 2 months ago
@5656bigsteve Thank you!
SIMKINETICS 2 months ago
So if i absolutely pedal like a maniac it goes faster automatically.... AWESOME. also would it fit a schwinn stingray?
Bluesbreaker2010 2 months ago
@Bluesbreaker2010 It would fit a Stingray, but would need to be fitted with a larger (front) chainwheel to compensate for the smaller wheels.
SIMKINETICS 2 months ago
cool now you can pedal while you wait for the traffic lights to go green...
metamaggot 2 months ago
@metamaggot Not on the bike version.
SIMKINETICS 2 months ago
so i f you started selling these, what would be the unit cost ?
nssurge 2 months ago
@nssurge The answer is in earlier posted comments.
SIMKINETICS 2 months ago
@SIMKINETICS i cant find it
nssurge 2 months ago
@nssurge OK. The price is up to the manufacturer, but it will likely be competitive with Rohloff at first, and lowered over time. We want the SIVAT to be very affordable, which it can be, due to its relative simplicity.
SIMKINETICS 2 months ago
How high can the ratio get? In a bike you want much more than 1:1.
misium 2 months ago
@misium Note that the sprocket combination is 55T/11T, so the system ratio is nearly 5:1. The product design will include an internal gear-up so that the front sprocket will be smaller than 55T while achieving such high ratios.
SIMKINETICS 2 months ago
Okay, so for the layman: With this, your bicycle shifts itself.
shadyalien 2 months ago
@shadyalien Yes.
SIMKINETICS 2 months ago
YOU WERE FISHING WHEN YOU GOT THE IDEA
HighTyner 2 months ago
@HighTyner No. Actually, several decades of ardent bicycling & tinkering with bike transmissions led me here! My first was a 45-speed in 1963; followed by a 63-speed, 81-speed, 378-speed, automatic traction CVT & ratcheting CVT. In 48 years, I've only killed 4 trees & 2 baby seals to get here!
SIMKINETICS 2 months ago
DID YOU TRY THIS ON A MOUNTAIN BIKE????
1991Dalina 2 months ago
@1991Dalina Not yet, but I did try out its predecessor CVT on an MTB. That worked quite well, but needed more range. This SIVAT is being re-designed for upcoming MTB use.
SIMKINETICS 2 months ago
Do you sell theses
pilotplans 2 months ago
@pilotplans Not yet.
SIMKINETICS 2 months ago 3
can i get one of these for my motorized bicycles that drive from the left side?
TheIndustrialphreak 2 months ago
@TheIndustrialphreak That will be the manufacturer's decision, but the drive can be routed with a jack-shaft to either side.
SIMKINETICS 2 months ago
2 questions. Does this transmission work to increase rotation if the drive chain is applied to the gear on the side we are looking at? another words, apply the drive chain to the side with the tape, to spin the other side faster? I'm working on a different project this may be just what I need.
Q for your project: in real world use, what is the lever attached to to measure resistance for automatic adjustment?
waterkeeper03 2 months ago
@waterkeeper03 The input & output are not reversible; for high gear ratios, the input or output to or from the SIVAT may be geared up though. The ratio lever reacts to throughput torque, so it does 'measure' resistance in effect. Please send further inquiry to my YT in-box.
SIMKINETICS 2 months ago