Engineer: How many differential gears do you want? Manager: Yes.

I never knew how they worked, and after watching this I still don't know how they work, only now I know they exist even if only on paper.

The early Acura SH-AWD system used a overdrive gear set or "Acceleration device" with individual clutch packs on each side of the diff that could engage and disengage independently to over drive a outside rear wheel. SH-AWD uses the VSA system to apply brakes to the inside wheels when cornering while the diff over drives the outside rear wheel to help rotate the rear and hug the corner. Honda has been playing with Torque Vectoring for years with the Prelude Type-SH which had ATTS.

Well, this all and great, and I do like it. Very clever. But it represents one thing I don't like: the constant rise in vehicle purchase cost and repair where the common man and woman can't afford them anymore.

I wish someone is out there to fix this useless background music.

thank you. that was the clearest I've ever seen it explained.

Seems like a good idea on paper but in reality it's just another way to over complicate a modern vehicle for something else to go wrong.

Extra složitý řešení. Nejsložitější co existuje. J.CH.

Tecnologia cada dia se renovando,se multiplicando cada dia.

That Diff Box looks HUGE!!! The Acura System for the SH-AWD uses Vectoring Torque as well with no need for this giant Diff Box...

I will take a brake based torque vectoring thank you.

Thanks in a million. Great content. Awesome imagination. Grade: A++💥

It looks like it's an open diff with elements of 2 Eaton diffs connected where the axles should be, then just beyond those, a clutch pack for each side. All of that just to make the car more nimble? How much more nimble?

how can the 2 sun-gears in one planetary gear rotate at different speed, while the planet gears are equal? Shouldn't there be bigger and smaller sun gear and planet gears in one planetary set? i thought that's where the overspeed comes from

I have worked at Acura since 2003, Since 2005 to 2013 never seen SH-AWD go bad yet

@belaruz Thank you belaruz. That is exactly what I was asking. Now days engineers do some really great stuff with both electric and fluid actuation of things. I figured I'd ask which form of actuation was used in this creation. Thank you.

Could anyone explain why during a turn, in the video, the outer wheel travels more slowly than the inner one?

look very nice, but if something go wrong, very expensive repair though.

DIFERENCIAL REVOLUCIONÁRIO; Parabéns o Inventor !!!………Ótimo em curvas ou pistas Escorregadias !!!………Ótimo em TRAÇÃO nas Duas Rodas POSITIVA OK💡💡💡💡💡👏👏👏👏👏👍👍👍👍👍OK…………OK………………………

Two clutches, two sets of split helical planetary gears and pinions, two servo motors to activate the clutches, all to get to soccer practice and the hair salon. Service writers love to see these moms hit the drive.

Are those servo motors actuating the clutches on each end of the differential? I presume that this system is electronically modulated by the ABS sensor system?

Too much total spinning inertia in the end probably. reduced reliability with twice as much machinery as already in a differential? Accura NSX concept accomplishes this with separate electric drive motors in hybrid addition to the ICE engine. probably many less parts in the drive line that way.

i have the same opinion as you regarding the electric motors, but this stuff is very important as it leads to better traction of wheels and more stable car.

As far as I understand this, they have kind of mounted an epiciclic reduction gear at each side of the main differential, that gears in into the final output shaft. When the friction locks the normally freespinning "driver" gear, the effect is that the epiciclic assembly acts like a reduction + differential gear, slowing down (as seen from the "main" differential )the final output shaft, but augmenting the torque seen by the outer wheel. There is a loss of power, I think minimal, in the transient state, when the freewheeler is neither locked neither allowed to go. Anyway, even if it isnthe simplest system to yave this in an I.C. car it is indeed quite complex, for something an electric car can have almost for free.

Muita coisa girando, imagina o tanto de potencia isso rouba do motor.

The inner helical cut gears are connected to the differential carrier and the ring gear. The outer helical gears are connected to the axle stubs. That should help some.

In the case of the rear Diff shown, torque is directed to the rear wheel outside the turn to literally push the car, from that wheel/corner of the vehicle, pointing the vehicle into the turn, to steer faster and/or more securely. The GT-R35 uses similar technology, on the front and rear axle, giving the car it's handling capabilities.

If I were to swap a Duramax diesel into my BMW; could this differential take the torque?

Who tells me what the name of the video differential is?

Excellent Completely Impressive

Now thats a big differential! Whats the advantage of the ZF type over, say, a Torson differential which is a quarter of the size?

Can you imagine paying the dealer to fix this.

The clutches are locked not moving unless you are in a corner like posi traction, the clutches would not last in a situation shown here.

@xWethewalrusx yeah i was looking at the planetary modules instead of the the joint near the clutches, they were moving correctly, my mistake

Баловство это, чем проще тем надёжней

please can somone tell me what is the name of the software used to do this simulation

25 nov 2019 1:58 pm est:thanks

Thanks Great Video

Wouldn't it be easier to use wheel hub motors and control the power of each wheel independently by a controller? less weight + less production expenditure?

@StevesProjects this diff is electronicly supported. a torsen-diff is purely mechanical. due to its construction it only lowers traction losses while the diff in this video tries to actively avoid slip at all. in order to do its job it needs reaction time () while the torsens effect is imminent. after all these two systems are different in any possible way.

wait why is the braking (red effect) on the outside wheel?? the wheel outside of the turn should be the one spinning faster right?? am I crazy or do I just not understand this ZF diff thing??

why when transmitting left turn, for example, the left wheel rotates faster than the right when it is supposed to be the opposite because it has less course than the right. I want to understand please

OBRIGADO !

It looks like the torque is multiplied to the wheel where the clutch is engaged but a torsen does same thing without needing clutches so it’s not a fully capable torque vectoring. If one wheel is in the air (say in a tight corner or off road) or ice, the other looses torque as well.

So there are two sets friction plates inside this differential. How much dose it cost to replace them when they worn out!?!!!

@Rotemetoot Right around 36 seconds, if you pay close attention to the center gears that are rotating toward the drive shaft you see them start to turn. up untill :36 they were sitting still, now they are rotating to compensate for the different in rotation of the tires. you can also see at :36 that the gear sets on the far right begin to rotate faster than the sets on the left, and then at 58 they meet and the left starts to spin faster. they could definitely have done a better job..

This music along with the motif of the vid makes me wanna build my SUPER GIGANTIC EVIL ROBOT AND CRUSH ALL THE PUNY MORTALS!! Sorry, got carried away; excellent demo and helped explain differentials in normal operating conditions.

just looks to me like they made something very simple, very complicated.

I get it,to break into a lower or higher range in turning instead of torque/no torque typical of basic differential....I like it but replace the clutch with hydrostatic conversion w/variable steer input. My question is in RWD only would it be substantive? Try FWD or AWD and you may have something there.

Simple. ZF states: "This system gives more power to the outher wheel in a curve to make the car more agile" That's what Honda's and Audi's do. And if I'm not mistaken, 1980 and 2005 come before 2013.

what the background song is?

@NeverWithMindBand a open one puts it on the wheel with the least traction

2 clutches on the output? Sounds like it'll wear down quick.

OOOOOooooohhhhhhh,....... took about ten minutes of study, but I got it now.

@unnamed15rus : I believe even the Acura RL AWD used this system.

I don't understand, where is the extra power coming from? Doesn't this show the outer wheel being geared down which would make it spin slower? Whats the point of the diff then, I must be missing something here.

nice.....witch car has it? and how much?

The video is wrong, it shows the outside wheel travelling slower than the inner one !?

I am glad u can read but if u understood what you just typed then you would know that what you said is the long version of what I said. opposed brake steering has been around for years how do you think the steering on early tanks worked? I work on lots of machines for a living and have seen this set up many times over the years maybe in slightly different configurations but some almost identical to the axle above with slightly different actuators. so explain again how Honda own this old design.

Because this ZF system seems to be standard with the rear diff that vectors torque. Audi's is an option with the AWD, Acura's is standard.

Looks like the old Viscous Couplings of the '80's

more simply more better this one is very complicated its many parts to broke

What is the benefit on this?

shouldn't the outside wheel be spinning more?

Torsen diff is all that’s needed. Add traction control if you like

good technology...

I wonder with all that technology, you still have a simple spider geared open diff in the middle.

munto bom legal mesmo

WOW, that is an awesome creation. Is the actuation mechanism fluid or electric? What is the reaction time of the activation? Very nicely made animation. I often wish I had that sort of computer knowledge. Thanks.

The gears are turning faster but the output to the wheel is slower. Less gear movement in the clutch=more direct power transfer.

This is like a ayc differential from a evolution

Seems as though the same effect could be had by simply applying the inside wheels brake..

The "red effect" is not braking, its locking the side in a way it receives additional torque from planetary gear and turns up to 10% faster.

How is it better than normal differential..?

Nice cut away drawing but what is this differential doing in a minivan??

Inversed graphic ?

what is software ?

And if the planet gears are connected to both of the inner gears at the same time (it sure looks that way), why do they spin at different speeds during corners? Am I completely off here??

Nas curvas, a movimentação das engrenagens, está ao contrário.

this can be done with brakes with much less complication and expense

thanks u

Ahhh.... I have watched that for more than 10 times. Wait, how can you write URL?

@distortedlife55 Seems, but can't figure out what is the purpose.

Ok so simple and torsen differential combined .....

i don't understand what the little gears next to the tires do? isn't that useless because of the extra friction losses and a heavy machinery?!?

I'd agree that it appears to opperate the wrong way round, but it also looks far more complicated than it needs to be! It looks like its a clutching LSD running in conjunction with a 'Torsen' type gear-set. I'm sure if you can vary the clutch loadings while in motion you'll have even more control but how complicated!

Сложно и дорого!

It;s basically the same principals as the Honda SH-AWD and SH differentials, with less clever marketing.

But does it drift?

What is the advantage over a Torsen differential?

There seems to be a lot of misunderstanding of the point of the complication here. Whether or not this is really needed is open to debate of course. However, the idea is to be able to vary the amount of torque delivered to the wheels while still achieving the differential speed action. Braking one of the wheels would achieve a similar effect, but would waste some of the available power. This system doesn’t waste the power. It is true that there is increased rotating mass, and greater complexity, more expense, and more to break and wear out. But it does achieve the desired result: controllable torque distribution on demand.

dude the alien music 😑

Se ve interesante pero no entendí bien cuál es la idea

what was wrong with the old one

I agree with those who say it looks complicated, but I disagree with those who think the faster-turning wheel is shown to be on the wrong side. Those who say this are focusing their attention on the outer part of the planetary sets, which are changing the torque output, rather than focusing on speed of the axle and wheel (also, the speed of the visible part of each clutch pack matches that of the part of the planetary set which increases in speed on the side facing the inside of the turn, so don't be fooled by that either). Focus on the speed of the axle itself on each side and you can get a better idea what's really happening. Start by looking at the axle ends within the differential itself. I wish they would have put visible markers on the wheels to make their rotational speed more obvious.

too complex and bulky, how often is needed to replace friction discs

Well, the diff is very similar to what tanks use, so if weighs like a tank and uses a drive system similar to one, it's a tank :D

Multiplicador de força

están al reves

а зачем планертарки?