Dual Clutch Transmission - How it Works
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- Опубликовано: 2 июл 2024
- Dual clutch transmissions, or DCTs, have become a popular transmission option for vehicle designers as they combine the gear efficiency of a manual, with the shifting ease of an automatic. Here is how they work. Dual Clutch transmissions contain the traditional elements of a manual and are driven by a twin, or dual clutch module. The manual elements include helical gears on parallel shafts to create different gear ratios, synchronizer systems to ease gear engagement, and an actuated shift fork system to select the appropriate gear ratio. Watch the video for more
Courtesy of DrivelineNEWS.com (Lubizol Corporation) 
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I’ve watched 3 transmission videos leading up this this to finally be able to understand it. I get it now. It’s only taken me 20 years of my life to figure it out. It’s such a basic concept made *so difficult* lol
Yea no kidding. I'm 15 trying to understand this and most of it kinda flys over my head. Crazy how people came up with this stuff.
I feel extremely stupid. How do people design this stuff.
one piece at a time
lol.
I know what you mean. I still had trouble completely understanding this.
I guess I need to be more smarter because me dont does it very well.
Standing on the shoulders of giants. How many people make it real?
The basic design has been around for a very long time in "standard" or "manual" transmissions. They just put two clutches and two gear sets in parallel to allow it to shift odd-even-odd-even and used a computer to control the clutch engagement and shifting.
Instead of being rude, I have an explanation that might help.
All of the gears are meshed in a way that acts like two transmissions taking turns driving the vehicle forward. This is made possible by the additional clutch. As one is being engaged, gearing causes another to ramp up and match speed. When it's time to change gears, the transition is nearly seamless.
People who don’t understand, already don’t under regular transmissions.
Dual clutch basically is in 2 gears at all times, I’m assuming based on throttle position it will anticipate whether you’re going to up or down shift creating a very quick switch between each clutch going into gear as the car is pretty much already in that next gear
Yup.
In a manual, to switch gears you have to disengage, and then reengage with a higher gear ratio.
So during shifting your car essentially has to go a through a neutral gear phase, where no gears are meshing.
In a dual clutch, you don't go through that period. Two gears are always in mesh, just a matter of releasing the clutch.
@@rohanahmed3088 Actually the gears are always meshed with each other. It's the synchros which lock and unlock the gears to the shafts.
@@joevarga5982 Yeah that's what i meant to say. By mesh i meant to say shafts are rotating at same speeds, i was not referring to gear tooth contact.
pardon my incorrect terminology.
@@rohanahmed3088 Huh? The shafts are rotating at different speeds due to the gear ratio selected.
For you who don’t understand this ( it’s a little complicated): It’s basically two transmissions together with two clutches. The end
4 times the trouble?
but u still have 3 pedals? or no?
No
Exactly!!! The end
Uhh, kind of. It's easier to think of it like a motorcycle transmission with hydraulically actuated shift forks driven directly off the crankshaft rather than via chain.
Thx so much, after watch this video I'm finally understand how transmission work, but not at all
xD
😂😂😂 priceless.
Becouse you are mister indians
I*
Clown
Apart from my last comment, this is an interesting video and I learned something from it, whilst trying to ignore the music.
Perfect technical explanation. Thank you!
Sounds like: If you f#ck up your gearbox it will be very expensive
that's gonna be hard to do.
Cheaper than a traditional automatic
+daave3 a little more
you most of the times "can't" fuck it up, but they are more likely to break by their own, like other automcatic transmissions. Also like a poorly handled manual
José Luís Lopes If your auto transmission been breaking you must be dealing with a shit car. I've only had 2 auto's crap out on me. I had a nearly stock 540i that was just a polished overpriced shit. I still bought a manual one right after though. The other was my el camino with a th350, but that's cause I was running around 900hp on the stock transmission and I blew up the motor at the same time. And the transmission on my el camino was still salvageable.
So.. basically 1 clutch handles gears 1 / 3 / 5 while the other clutch handles 2 / 4 / 6 or something like 1 / 3 / 5 / 7 / 9 - 2 / 4 / 6 / 8 / 10 for those crazy ones. And with the alternating clutch system, you are able to truly shift the transmission without a clutch pedal..
Yeh this is the type of gearbox used in a lot of race cars apparently. Yes there are a lot of parts that can mess up but because they are basically manual gearboxes they are really strong and can take the punishment. No teflon bands to go old, brittle, slip and fail as per a standard automatic gearbox. Because they are complicated to operate they are not operated with manual clutches. Modern cars have the computers change the gears for you. There will be no clutch in your car to push.
@@darylleaf2081 not just race cars. They are in lots of car nowadays
My 2013 c class has DCT and a 20 year old Audi will have DCTs as well and that’s just 2 easiest examples
@@Vlad-fe8pv and lots of problems from computer programming errors to seized input shafts clutch failures. Anything automated is going to have problems. This is just another crutch for the lazy that dont want to learn to drive properly. Everyone should have to start driving on a manuel transmission. Once that is mastered they can drive anything
@@holmes1956O I have a kona n with the DCT and also hundreds of hours of track time and you can not shift as fast with a manual--also most DCTs are also almost half a second quicker in the quarter mile as opposed to manuals--even the new manuals that have super quick rev shifting like the new blackwing caddies--the auto version is faster.I have also owned many manula cars and sadly they will be going away in the next generation or 2.
@@khronin just exactly where did my post say anything about the speed of the shifting. You self proclaimed specialsts are nothing more than professional braggers. Legends in your own minds. 😂😂😂😂😂😂😂😂
A pesar que no entiendo ingles pero este ES EL MEJOR VIDEO SOBRE ESTE SISTEMA DSG QUE ENCONTRADO EN INTERNET MUY PERO MUY FACIL DE ENTENDER LAS IMAGENES HABLAN DE POR SI SOLAS
It took me a while to understand the video fully but thank you so much for this!! It was very informative! God bless 🙏🏻
Hells bells 🔔
God is fictional.
I watched the replacement of a dual clutch on a Ford Focus/Fiesta gearbox. No you can't repair these at home, and parts are expensive and expertise limited. There is too much knowledge needed and specialty tooling. I find it good fun to watch these videos!
What’s cool is Ford put out a recall they replaced the clutch on my 2015 focus for free my focus made it to 117k miles until I took it to get that clutch replaced there was nothing wrong with it it still shifted good but i heard that recall was ending soon for the 2015 focuses
This is by far the best explanation i’ve come across
I’ve spent so many years of my young life researching how cars work cause I’m weirdly obsessed. I feel like the only thing I don’t have complete comprehension of are transmissions. Maybe some day. Lol
This is engineering's knowledge. So awesome and headache.
I had a dream about this transmission last night, Ive only every driven 1 dct mercadies and it was alot more responsive than plaetary stepatronic automatic transmission I have in my e90 bmw, the simplicity of DCT is amazing, I hope to always have a multiple shifting trans car im not falling for the 1 gear 10k hp dc/ac relgluated shifting motor, its just not the same.
How do you say all this in english..
@@nicholasnjela5217 I don't know, but 5 people apparently understood what he was saying.
Mrecadies 😂
What is a trans car? A transgender car?
Very interesting.Technology behind The Ford Automobile is sophisticated and marvelous for the safety of users.......
Now I'm going through the video and I will comment at length after assessing everything without any hesitation.Thak you all.
"Marvelous for the safety of users" how so?
I can't see the safety aspects of it being any different than that of a normal trans with a torque converter.
As a guy who’s been using a clutch pedal since I was 16, these things are fantastic. The younger generations get confused when they look at 3 pedals these days, it’s hilarious watching them drive an old truck with a heavy ass clutch and long shift throws 😂.
Lol ya show them a 5&4 and check the look on their face
Not to be confused with dual clutch plates systems of heavy trucks. Saturn pioneered using a manual transmission configuration with automatic shifting 20 years ago.
Very instructive 😊
I thought planetary gears were hard to understant but this is another level
Very nice and very good .tanks
The engineering and illustration are excellent.
Reminds me of the Goss 700 presses.
Open up the gear side access door and it looks like a bewildering wall of gears.
On closer observation, you realize it is all simple gearing that is just layered upon layers.
vry good video, thx.
best video simple description
The answer was out there& someone figured it out!
Dang so if you had to visualize this with a pedal, you would have 2 clutch pedals 🤯 meaning 4 pedals all together. That would be insane.
yea, because it a special design for squidward 🙏🏻😌✌️
Good work 👍👍👍
Nice video
Killer vid
This makes me want to drive my GTI now lol
you picked the right transmission
Still confused in 2019
lol
Lol same
This video is litarally how it works. Very hard to take any learning from this piece of shit. Dual clutch on 4 minutes.. there is no way lmao.
Still confused in 2020
@@sepehr7402 Still confused in 2021
Good diagrams.
I have one question though: why was reverse not demonstrated?
Title: How It Works
Me after watching: ....nani?
its good video
Got it !
I’m glad to see GM finally put one in the C8 Corvette.
Hello TREMECtv, What synchronizer locks the input shaft to the 6th gear selected? Secondly, how many overdrives do we have on this 6-speed automatic transmission?
A type of Automated manual transmission, with two computer-controlled clutches, depressed and controlled by the electrohydraulics, pneumatics, actuators and computers of the vehicle for smooth gear shifts. One clutch is responsible for odd gears, and the other for even ones.
Electrohydraulic Dual-clutch transmissions are much faster than the older style Electrohydraulic single-clutch AMT, with variants like the "SMG" used by BMW, "F1" transmission used by Ferrari, "R-Tronic" by Audi, "e-gear" & "ISR" by Lamborghini, and many others. The basics of both these types of transmissions still contain full manual transmission internals, but just use an automated singe/dual-clutch.
Big brain moment
So like, the next gear is already engaged? It just switches to that gear once the last gear disengages? I think i get it.
So basically the next gear is pre loaded
I love my Land Cruiser:)
China
I think I got it now, except the clutch/transmission/gear part.
Dct basically add more components in order to have a faster and more efficient and resistant shift
how does the reverse work on such a gear box? does it still use the three gear arrangement?
Honda the power of dreams
Nicht verstehen sie!
Is this basically the same way as dual clutch transmissions work in those big rig trucks?
Digging the spyro/terraria music lol
Believe it or not, but the older 4 and 5 speed Honda automatic transmissions have the same gear setup as a manual. Just with the added torque converter, valve body, and clutch packs. They don’t use planetary gears like other car brands do.
Watching this before taking delivery of my 2022 Ford GT500 they come with a DCT.
The "wet clutch" unit shown here is not as efficient as a "dry clutch" DCT, but is BETTER in high torque applications (better heat dissipation).
What about the durability of the dry clutch. I heard that the DCT from Kia and Hyundai is shitty.
This should defeat the war between auto and manu
I will always prefer manual over automatics because I love the feeling of shifting the gears with a stick :) it connects me more with the vehicle and driving
I have the 2015 focus with this transmission it now has 117k an I have had no problems with it so far I love it
In Dual-Clutch Transmission what is the dirre between Wet or dry? Benefits of each other , and which car models uses it.
How they compare to manual cars, cost and maintenance wise?
😉yeah i love my NC750X
In Australia they are a 6 speed manual trans, how does your comment pertain to this video?
Nice video, great presentation. Help me understand if my engine oil is used for my wet clutch on my Audi Q3 quattro 2.0 TDi with 7 speed DSG gearbox?. Particularly i need to know if i can use liqi moly engine oil additive which has MoS2 as friction limiters, i want to avoid this additive if engine oil used by my gearbox in which case due to MoS2 it will start slipping the gears? Your expert advice will be greatly appreciated, thanks a lot.
No, your engine oil isn't used for your clutch. Check the owner's manual or the service manual, you'll have instructions on what kind of oil is used where. Odds are you won't need to deal with clutch oil per se. You'll change the gear box oil (and implicitly the clutch oil) as per manufacturer recommendations since the wet clutch of VAG DSG's share their oil with the rest of the transmission.
How does the oil pressure get into the clutch? i mean its rotating, how can you put a line in something thats rotating?
Hi could someone explain which are the clutches as I presume the gears are the cogs, so is the clutch the round bit at the end?
Impressive. Q 4 expert. If clutches get hot (hot climate) frequent stops. What suffers? Solenoids. Computer?
Is my understanding correct: So one shaft is connected to one clutch. there are two shafts and two clutches. one shaft contains gears 1 3 5 and the other 2 4 6. So while one shaft is engaged the next gear (which is in the other shaft) is being synchronized to that rotation which leads to a smoother and faster gear change and this processed is continued till the last gear.
please tell me my mistakes and the important things that i missed to understand
We have the same understanding. I think its right. Dual clutch also means 2 sets of transmissions, 1 dor odd gears and 1 for even gears working together resulting to smooth gear changes.
Can you do the hybrid dct like the dq400e from Volkswagen?
With all these new gears, CVT, DCT Very hard to find a regular automatic transmission in new cars anymore .
If it was not about the long traffic jams , I will go manual gear box tomorrow
Regular automatics are everywhere, GM, Ford, Dodge, they all use them, and BMW is going back to regular automatics, the ZF8speed is in the BMW M5. More reliable.
They say that the Malibu will be a CVt
Also not a lot of front drive sedan american cars will stsu in production
I cannot afford a BMW
He need to explain how the mechatronic unit (electro-hydraulic device similar to the ABS modulator) received shift lever signal P, R, N D, acceleration signal (gas pedal), and speed signal ( engine speed, vehicle speed, input and out put speed in the transmission) all these signal will send to the PCM or Gearbox module to process and determine the next shifting movement.
What kind of frikin brain it must take to dream something like this up !
So why does a DCT shift faster than a conventional auto, if they both have to disengage and engage clutches/clutch packs at separate times?
Ok my big question is can I still drive my dct when I only have single clutch working ?
If you have a single clutch transmission, is it possible to convert the vehicle to a dual clutch transmission.
How does park work in these though??
can dct gearbox equipped in a car be replaced by AMT (Automated Manual Transmission) gearbox?
I have a CVT transmission in my Chevy Spark. It is an AMAZING tranny that propels this Daewoo product from 0 to 60 only 17 seconds! Eat that DCT fans~
I'd say that amazed me.
Little confused with something, when the 4th gear is select, the third syncronizer is still connected which means the third and fourth gear are connected together.
Same with 5 and 6th. Which means at 6th gear, all gears are connected too 😫😫😫
After a basic settings calibration on my DSG . I put into drive and it violently slams into first. Any idea what problem could be? Sticky shift forks is my guess. Reverse is also jerky. It goes away after a 5-10min test drive.
Just try renewing fluid and filter, and throw in a bottle of Lucas transmission fix and see how you go. Also try cleaning off the body earth from your nagative battery terminal, clean both terminals on the battery..
.coz why not?
There are also earthing points on the transmission to the vehicle body, clean those too. Good luck
You can also try resetting the transmission Calibration, through a scantool or by disconnecting batt terminals, turning on headlights for several minutes then touching battery terminals together. Refit everything. Two days of driving around should sort out the idle and gearbox algorithm for your usage pattern at that point.
Watching that was like trying to understand a woman. Impossible.
Possible when you as a student at mechanical engineering program.
Or It could be that you need a better mechanical comprehension of transmissions, I'm drunk whilst writing this & watching the video, I found it rather easy to comprehend (That means understand).
I'm a girl and even I can understand this video. Not quite sure how much more simple it could possibly be. o_O
@@MissNebulosity Thank you
@Charlie D you're* 🙃🙃🙃
how is the shifting mechanism of the fork is controlled?
By "step motors" controlled by the TCM.
i wish i could put one of these in my honda civic :(
The second clutch anticipates the next gear? But how does it down shifts?
Same way when speed decreases it anticipate for lower gear shif its all computer sensors
Hi, we are Nissan Taiwan Crew, Could you possibly authorize us to cite a part of this video in our films on RUclips about DCT knowledge？
PayPal
Very nice video (music a little too loud).
I have a 9 gears on my car and it is very efficient.
I think i understand how it works.
So, if I got this right lets say it's in 3rd gear and I want to select 4th gear, 4th gear will be pre-selected so that the change is smooth. But what if I don't want to change to 4th and decide to change to 2nd for better acceleration how does it make that gear change smooth? How does the transmission know if I want to downshift or upshift?
if your throttle input is over 80% then it will shift up to 2nd, or if your throttle input is over 60% but your engine load is already over 50% then it will shift up to 2nd
Can it make a car jack
I'll stick to a purely manual transmission as long as it's available. More fun to drive and more appreciating due to skill it requires.
Me: I know every single thing about car
Also me:watches this video
Me: well,shit
So its like a two manual transmission meshed together to make it automated.
I thought this video might actually show how the "DUAL CLUTCH" system worked. Now where did I get that idea? Very nice animation, but all it showed was the additional shaft with gears for the second clutch, and just the outside of one clutch housing. You get to guess what goes in inside. I easily learned how these work from a static 2D diagram in a car magazine. This video left me confused.
Two manual transmissions where one is always on a higher gear than the other, and the shift just swaps power from one to the other.
Animation is confusion. label marker would have helped. or use contrast colour to highlight
Können Sie empfehlen Medikamente für Furz und Durchfall? Ich Furz wie eine große Trompete. Vollen Klang, wie ein Kaiser Furz. Mein Durchfall fließt wie ein Fluss!
This is great but say the transmission just upshifted to 4th gear under normal driving conditions, it lines up 5th on the primary input shaft then suddenly the driver floors the throttle and needs to downshift. This will not be instant since the shift fork is in the wrong position, there will be a delay while the primary input shaft re-engages third prior to allowing to the clutches to swap. This system requires a highly advanced predictive powertrain controller and I don't see how it will ever be as fast as a true manual on the downshift unless it could read the driver's mind and see/read road conditions. Seems like an insanely quick drag racing transmission though, if it can hold the torque.
Next time you are in your manual transmission, time your downshift and wot and see how fast you are, bet the dct will be faster
Estoy biendo
This video taught me more than 6 hours of school :/
What are the advantages of DCT over the conventional CVT ? I feel that the DCT eventually will have more mechanical damages than the CVT which is a straight forward mechanism.
@@Michael-uo4jj your explanation on DCT lacks clarity please.
"In theory" ... the DCT gives you more robust friction surfaces (clutches) through which engine power is transmitted, along with solid gears. A CVT has a kind of squishy system with limited surface contact area for the power to get from input side of transmission to output side. Early versions couldn't handle the power of cars and they are still usually found only in lower power vehicles.
They all suck. Get a normal torque converter auto and change the fluid and filter every 2 years/40k km.
@@DoubtingThomas333 lmao hell no ever heard of the pdk or the dct Hyundai made now? They are insanely good
@@Mr.Thermistor7228 they don't hold up, and they aren't meant to tow anything. On top of that nobody will or knows how to rebuild them, they're replacement units only. There's even a heap of proprietary configuration and tuning software, not to mention tooling to be able to even deal with these transmissions.
A normal manual or torque converter auto on the other hand is much much easier to rebuild and repair.
Also I changed my opinion, I'd be replacing the fluid in any transmission every 20k km. Fluid is cheap, transmissions are expensive.
i need to understand very well want can i do??
I have a doubt. I must put in neutral position when I stopped in red light or it is not necessary to keep the life of the clutches? Could you please explain me this situation ? Why does the DSG do this job for me automatically when I stopped my car on the red light and keep the DSG in Drive?
Depending on wether the DSG has dry clutch packs or wet clutch packs. The transmission disengages Drive (when in D at a stop) to stop the packs from getting too hot and increasing the wear. They do this by disengaging the clutch packs and putting on the brakes (even though the car is still in Drive).
This is exactly the same principle as a Manual and you pressing in the clutch and putting it in Neutral at a red light (or holding the clutch in) to stop increased wear on the clutch.
This means in a DSG, you don't have to change the car from D > N when you have stopped, because it's already done it for you!
Hope this helps.
Hi Jason, Tks for your comment. If you read the DSG service manual, you will see other recomendations for this situation. Please, see below:
"N"
position of the floor-mounted shift lever means that the transmission is in"neutral". Similar to P above, both clutch packs and all gear-sets are fully disengaged, however the parking lock is disengaged. This position should be used when the motor vehicle is stationary for a period of time, such as atred traffic lights,or waiting in a queue of stationary traffic. The DSG should not be held in any of the active gear modes while stationary using the footbrake for other than brief periods
-
due to the clutches being held on the bite point, as this can overheat the clutches andtransmission fluid. This position also allows the engine to be restarted (in some cars needing thekey to be partially disengaged) which cannot be done in any of the active modes
Source: pt.scribd.com/doc/134353573/Report-DSG#scribd .... Pag 27/37
So, Who is correct? I'm still not confortable with keep the clutch engaged when I stop in red light. I would you like to find others technical sources about the correct procedures of DSG. If you have theses sources, please let me know here or by email. Regards
Marcelo bhering
It depends on the manufacturer as well. I have a Mitsubishi with a dual clutch transmission. The way this one works is when the vehicle stops, such as a red light, the clutches lose hydraulic pressure, therefore disengage. As soon as you let off the brake it slowly put pressure back on, engaging the clutches. I put my vehicle in "N" anyway but just out of laziness lol.
Valid question on disengaging auto gear transmission while waiting at traffic signals. Is it recomended to shift to Neutral position and hold the brake while the car is idling at signal intersections?
How do people come up with these genius ideas smh I'm never gonna amount to anything
So what did ford fuck up on the focus
So basically it shifts into the next gear before it needs to be?
Yep. And then hydraulic pressure just switches from one clutch to the other, hence why it can shift so fast.