Sequential Gearbox - Explained
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- Опубликовано: 5 фев 2025
- How does a sequential gearbox work? How do Formula 1 transmission work? In this video I explain the complexities behind a sequential transmission.
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Haha thank you! My thoughts: 1. Music doesn't help you understand cars any better. 2. Intros don't help you understand cars any better. 3. Getting to the point helps you understand cars better.
Glad the recipe has worked for someone!
This video helped me understand cars much better! Hahaha
Seriously great explanation, I've seen all your videos talking about gears and transmissions, but there is still something bothering me about rpms, specifically down shifting and rev matching.
I understand that you need to increase the engine revolutions to match those of the lowest gear, but I can't see clearly when I think about the gears and synchronizers
It would be great if you made a video like "How manual transmissions work "explaining how rev matching works with an actual transmission
It finally been said... Lots of music and confusing content can be a headache... Thanks for the video... Great explanation
I am speechless. You sir are a perfect example why I love youtube so much.
This was BY FAR the best explanation on sequential gearboxes, and I understood it completely. Just by looking at your drawing, it suddenly all made sense to me. Also, you are very clear and thorough.
Thank you very much for this!
Very welcome, hope you enjoy some of my other vides as well!
I share your sentiments Uri, watching for the 1st time on the topic and get it completely.
Agreed.... Best explaination I seen...
it's a good explanation on how gearboxes work in general
If only scool teachers could explain something as good as you do we wouldn't have so much problems in Argentina
World mate, world. We here in Latvia think same 😂
I appreciate the high expectations!! I am only a one man team though, I'll get there eventually! :)
Bro made super realistic car sounds, definitely should have those sounds in a game!!!
Anyway, great video, finally was able to understand a sequential gearbox.
Keep on the good work mate!
Yes, I'm an ME; I took a few related classes but have learned the majority on my own.
At time 9:51 you mentioned that you do not have to use the clutch after first gear with a sequential transmission, but shouldn't all the same reasons for needing to engage the clutch on a regular manual transmission still apply to a sequential transmission?
The Way My Man explained the downshifts and upshifts with the sounds is just 👌👌👌👌👌
Great engine noises bro!
+fod8u Badumm badumm badumm!
fod8u you don't even deserve your subs
100% realism 10/10 would formula one again
Sounds like single cylinder F1...???
They made me smile
Jason, I have been struggling to understand how the sequential gearbox on my new car works and you have explained it brilliantly, thank you so much!
Dude, the things I like about your vids: (1)you dont have any silly music playing in the back ground. (2)You dont have any silly intro sequences (3) you get straight to the point. Keep up the good work. God bless.
It's good to see how far you'll come alone bro. I dont mean to poke fun but you have so much more enthusiasm in your newer videos lol. Keep up the great work.
It's also worth mentioning that almost all motorcycles use a sequential gearbox.
I was thinking about that the whole time as well lol
Cesotoseot Biggest difference is the number of selector forks and the missing reverse, so that 1st and 2nd, 3rd and 4th, 5th and 6th are grouped together on 3 selector forks instead of 4 with neutral between 1st and 2nd. instead if between R and 1st.
almost ? : D all of them are sequential hence no Sticky do hicky :D
which bikes does not have a manual sequential transmition that goes from neutral, down into first. then second and counting 1, N, 2, 3, 4, 5, 6
@@mannyechaluce3814 Honda has a dual clutch option for their dual sport bikes.
I gotta say this is the best explanation on sequential gearboxes I have ever seen in my life. You have the GIFT of lecturing and I am amazed. Been binge watching this channel and I just HAD to leave a comment on this... I am gonna burn all your videos on every type of media to never lose this knowledge lmao
Great job! Saw dozensn of videos on the topic, each one left me with more questions than answers. You sir, were clear, consice, and comprehensive. Also, I love that you did the gear shift sound. It's what separates the real petrolheads from the unenlightened,
You're videos are awesome! It took me 5 minutes to go from barely knowing what a sequential gearbox is to fully understanding how it works.
Your knowledge of engineering processes is something that you picked up from observing the world around you, but your desire and ability to explain these concepts to others comes from within. You, sir, were born to be a teacher. Go out into the world and make your mark, and then come back and teach this stuff. Outstanding!
Why can't this be the way I make my mark?
I came here knowing that in motorcycle gearbox you can switch gears in order and that this board scheme makes no sense. And now I believe I understand operation of aformentioned gearbox. Congratulations, You just earned new subscribor.
When I hear you explain the stuff I've wondered about so easily, I wonder why the heck I took so long to try to learn it. Have you been told you are an exceptional teacher? I seem to have no problem understanding any concept you explain. Well done, man!
I guess this was one of your earlier videos. The flow was a bit more choppy, but the explanation was pure gold! Thx for all your great vids!!
I don't think I've ever received such a compliment. Unfortunately that man has 1000x the brain power of myself. He's incredible.
That is by far the best explanation of a gearbox Iv ever heard! Your explaining it as an F1 gearbox but it's exactly (although slower) the same as a motorcycle! Thanks very much!
My mechanical knowledge of car have went up drastically since I been watching your videos! Great thanks!
Hey, im from lebanon and im doing mechanical engineering, and all i want to say that i love ur channel, your videos and the way u explain ur topics! All the best for You, And keep going!
I love your videos! You've got a real knack for explaining otherwise very complex mechanics in visual and easy to understand terms. Thanks!
Very welcome, thanks for watching!
So my searching about sequentials landed me here, and as soon as I saw your diagram I completely understood how they worked. Great work man! Looking through your channel I quickly subscribed and will definitely be watching more videos.
Dude, you're brilliant. I happen to be a Mechanical Engineer myself and I've found your
videos extremely useful providing to-the-point info. Great work. Keep it up!
Where has this channel been all my life? These are some of the things that encourage me to go on with my engineering course :)
I came here knowing that in motorcycle gearbox you can switch gears in order and that this board scheme makes no sense. And now I believe I understand operation of aformentioned gearbox. Congratulations, You just earned new subscrober.
After 40 years I now know how the sequential box works. And from one of your other videos, how the "air spring" operated valves of a Formula 1 engine work.Thanks heaps from Down Under.
Great to hear! It's not that the stuff is that complicated; there a just a ton of sources out there that "explain" it but don't give all the details. As you said, it takes me a while to figure this stuff out, since many sources don't give all the needed information. But I try to provide the essentials. Thanks for watching!
Tremic transmissions now sells sequential conversions for some of their newest aftermarket transmissions. I would love to have one in my new Shelby GT350. It was built to be driven on the road courses and street. Again you are fantastic at teaching. Keep up the great work.
Now if you don't understand what a clutch is, I have a video to explain that.
Now if you don't understand what a video is, I have a video to explain that.
Now if you don't understand what an explanation is, I have a video to explain that.
Endlessly helpful, thank you sir.
I cant stop watching your videos. You break things down very well. I was wondering if there was any way you could explain how a harley v-rod evolution motor works. The transmission and motor are one piece and i have always wondered how it works. Keep up the good work!
Yes, they do. While holding the neutral button, the driver can downshift into neutral from 1st gear. It's a safety built in so that the driver doesn't accidentally shift into neutral. There's a similar button for reverse. I'll have a video on the steering wheel up in a week from today.
I wish I could understand English!
You did a fantastic job
Hi from Italy and forza FERRARI!
Yes, you could potentially have some clutch slip (minor) while shifting gears. Also, depending on the design, yes, there can be a very tiny space between where no power is delivered. This can be overcome by similar designs to DCTs, where two forks move simultaneously to minimize the time with less torque.
great job! u explain it so well that a business student can fully understand how it works in 10 mins.
Jason, first let me say I'm a huge fan of your videos. I've been watching them for some time now and am happy to see how well your RUclips channel has done. I, too, recently graduated from a MechE program. I've been thinking about the concept of clutchless shifting in a synchronized gearbox lately and just want to run my thoughts by you. I've always assumed it is a very bad thing to do, as it would cause undue wear on the synchros. But now that I got thinking about it, I started thinking that maybe it's not all that bad--provided you're fairly good at it. Initial intuition would tell you that it puts a lot of wear on the synchros because they have to synchronize the speed of the input shaft, gears, flywheel, and engine instead of just the input shaft and gears. But at a closer look, I thought that synchros wear would really only be a function of three things, 1. Speed differential between input and output shaft 2. Force applied to the shifter, and 3. Duration of contact. With a clutchless shift, there is very little speed differential (none of you're perfect), there is less resistance on the shifter than during "normal" shifts, and it goes into gear just as quickly. This would lead me to believe that a reasonably good clutchless shift can actually put less wear on the gearbox than a normal shift. Is this correct? I know the best thing would obviously be to rev match AND use the clutch, but I like to show off!
Jacob Shaw these gearboxes actually use dog engagements, which operate slightly different from your standard synchro.
from what ive seen, a synchro is still somewhat apparent with a dog clutch, just not nearly as apparent (further reducing the amount of friction introduced and force required to change gears.)
Glad to help, thanks for subscribing!
I hardly ever comment on RUclips videos, but I'm doing so because this was an excellent video. Good job! Keep it up!
In formula 1, yes, between reverse and 1st gear. There is a special button you must hold to switch into it (see f1 steering wheel video).
You say with sequential you can't go from 5th to second for example a turn. Technically you could, but you'd have to take your left foot off the brake and use it to disengage the clutch and still go through all the hand motions. Not efficient, but possible!
I've watched several of your videos and this is the first "a ha! You got something wrong!" I've been able to catch. Great vids, accurate, informative, and passionate yet concise.
you still physically have to go threw the gears if you engage them or not.. So he is correct. Just because you do not engage the clutch does not mean you go threw the gear.. On a typical H pattern trans you can go from 6th straight to neutral then over to 1st .. with out going into the other positions .. in this trans you can not you still must pull the lever 5times to get down to first... So good try but you are wrong..
Dude, discovered your channel, ive been driving for years but concepts like these make me appreciate the engineering of cars , like your videos, deff a subscribe, where do you go to school?
You've gotten better at your presentations over the last four years ;)
Excellent vid but I have one pet peeve. I think you left out a crucial difference between sequential gearboxes and normal synchromesh manual that we have in everyday cars. Many have asked in the comments how is it that you can change gear without pressing the clutch and without rev matching when the gears don't have synchronizer rings and adjacent gears don't rotate at the same speed (obviously).
Well the answer for those who asked is that the coupling between gears and collars is done using "dog clutches" (look it up) and pushing the collar as fast as possible into the gear. Indeed, using the clutch and slowly shifting like a normal manual would wear them more. So yes, in fact, you just engage the new gear even though the rotation speeds don't match, using dog clutches. That is why we can clearly hear the loud clicking sound when a race car upshifts/downshifts because these dog clutches absorb the impact of differing gear speeds.
this is great dude.perfectly explained.the teacher has taught and the learner has learnt !!!!
Thanks Jonathan! I appreciate the comment.
Terrific video. The success pf this channel was definitely well-earned.
Dude....awesome explanation. Very clear and concise. very much appreciated piece of info. You use the perfect balance of detail and simplicity.
I have to say you give the most in formative technically correct of the youtube things I watch thankyou Dale in arizona keep up the good work
It's really mind blowing as to how everything can handle the stresses of this. Just think about this F1 engines spin at around 18,000 RPM. Then in as the driver shifts it drops by ~2000 RPM almost instantly and under full throttle.
Prum prum prum prum....haha priceless :D
Amazing video Jason. Keep the awesome explanations coming.
Could be, or it could be a mechanical lever which rotates it through your foot pressing a pedal, pulling a shifter, etc. As always there are many ways of doing it, and different companies have different methods.
Seamless shift is often in DCTs, but Mercedes (and others) claim their F1 gearboxes never lose power during the shift (hence, seamless). I thought the same about the gear changes, the difference if 2 collars are used in the shift or just 1. I couldn't tell you to be honest, though it does look like using 2 would be quicker. This could be overcome using more selectors and collars, but who knows if it would be worth the extra weight/complexity.
I'm almost done with 3rd-yr electrical and your channel made me have second thoughts about my major! hahaha. Cool stuff man =)
Great explanation. I always wondered how they worked. If I remember right, the most common road vehicle that uses a sequential transmission is a motorcycle.
+Andrew Timm It's right. Basically only racing car use sequential transmission.
I appreciate the small details in your diagrams, e.g. the way the helical gear teeth are drawn, and that you remembered the reverse gear would have its teeth slanted the other way (beause of the reverse idler gear).
Hey Jason, I've been a fan of your videos for a couple of years now and damn, I wish I would've seen one about dog boxes/straight cut transmissions. Howsoever, keep up the good work! :)
Awesome, nice explanation! Clear and concise. Question: you say "that after moving in 1st gear, clutch is no longer needed for gear changes..." Then are the syncros typically bigger, stronger, more aggressive and would the same also be true for the splines/hubs?
You're welcome Christopher, thanks for watching!
Thanks, I graduated from NCSU. There's some more information "about me" on my website - the link is in the description. Thanks for subscribing!
If the gears are straight cut (spur gears) they create much more noise. Also, racing vehicles tend not to worry about noise as much, so it's not as dampened out as it is in production cars.
I've got a video on it if you'd care to see it. Not sure what you mean by two gear boxes; two concentric shafts with separate clutches, yes, but not two transmissions.
In V8 Supercars, in Australia, they shift while the clutch is engaged. The engine is programmed so that it will decrease the rpm while shifting up(we are not even talking seconds.) It is called gear cut and is also used in many of the GT classes.
Sometimes two drums are used to control selectors so that you can dial out any play/backlash for faster response times, and also so that you can start to move the gear you want to change to a little before the driven gear dog ring starts its disengagement cycle. A slight negative angle on the dog teeth keep them engaged while torque is applied.
Anything can use it, that doesn't mean they will though. It requires the operator to select gears, most drivers don't want to, hence they drive automatics.
this kid knows how to explain cruise control and sequentials he is awesome.
great vids. very simple explanation. the only thing that makes me difficult to understand its that i speak very little english. keep going you are great.
Greetings from Argentina
This is the best dog box explanation I've heard thus far
Your channel is MUST for all petrolheads! Please keep up with great videos. Also please inform us as much as possible about new hybrid systems in sports cars (KERS, electro. hydrogen...) I know that you made videos about those subject, but I expect even more from you :))) Thanx !!!!
ever wondered what an F1 car sounds like? find out at 9:04
:D :D :D: D
Excellent video and explanation. Now I understand how my motorbike gearbox is working.
However, just to make the point, you forget to mention that changing gear without actionning the clutch, you have to lower the torque on the shaft so that it would shift (done by cuting the injection)....
And just a tip for your videos to be even better : don't look your whiteboard so much... (learned that in some competitive exams ! )
Thanks ;)
Well the majority are likely using torque converters (lower end vehicles with paddle shifts), but for the higher end, excluding DCTs (which switch clutches, done by the ECU), single clutch transmission would have to have electronic control of the clutch actuation. But this would still likely be much faster than a human switching gears.
for sequentials with gear shifters, usually the left foot brakes and right foot taps the throttle to match the revs, which then doesn't transfer (jolt) the weight to the front too quickly with the change in rpm from one gear to another, which can unbalance the car and reduce your maximum braking capacity. for flappy paddle (steering wheel) sequentials like the nissan gt-r, I believe they are smoother shifting with a dual clutch set up (for odd and even gears), but no clutch pedal,thus no revving
Brilliant! Thank you for explaining it so eloquently.
Watching in 2020...
Mister, Still it's worth a Lot❤️
ah, from a fellow trucker here; Engineering is right, they're just your typical, unsynchronized manual transmission. i think what you're asking about is the range valve. the switch on the front of the shifter, right? that just switches the transmission into it's high range so you can grab your upper gears. splitters (on the side of the shifter) do a similar thing, only they give you half gears. for example, an 18-speed transmission is really basically a 9-speed with each gear halved.
Some higher performance vehicles yes, I have a video on DCT's though, which are different. You can search my channel for "dual clutch" and should be able to find it.
She's fantastic; she just got a new camper and is ready for adventuring. How's yours?
Please do, thanks for watching!
In F1 gearboxes, when you shift, both gears concerned are engaged for a split second, and the old gear gets disengaged just before it will start to be a problem. This allows the wheels to receive power continuously from the engine.
I’ve made a video about how the Mono gearshift works and linked to this really great video, thank you
first time i understand how a gearbox works. very clear video. thank you very much! :D
Things that aren't street legal are usually illegal due to either emissions or safety. I can't see a transmission really affecting either much, so I don't know why it wouldn't be street legal.
Because you sequentially select each gear; 1, 2, 3, etc.
This was actually a very good source of information.
Straight cut gears are mainly used because of their efficiency in transmitting the power. Helical gears are actually stronger (and also smoother, hence the quietness) if the same size is considered than straight cut because there are more teeth in contact between two gears. This is called "contact ratio" The "dog" refers to dog-rings that are in place of the synchro-rings in the transmission. They have axial toothing instead of the synchro's conicality to match the gear speeds when changing.
my god this gearbox design is BRILLIANT thanks so much!
Engineering Explained can you please explain the Dog box, and the dog gears differences from this trans! Thanks
the dog box uses regular H-pattern gear change and is not as fast as sequential gearboxes but faster than your average gearboxes. the dog box differs because the sequential as mentioned change in sequence but the dog box is still an H-pattern gearbox which uses dog (spur) gears. spur type gears don't need to be synchronised like average helical gear sets therefore clutch is not needed during gear change making it faster. they are also stronger than helical gears which is why they are used for racing. the main difference is that because the sequential gears are all in line the shift times are much faster than the H pattern style gearbox... sequential also eliminates the chance of going into the wrong gear say down shifting from fifth to second when you meant to go fourth... its fool proof lol so you wont blow the engine or destroy the gearbox
Brilliant explanation. Sequential gearbox explained from very basic principles. Even my mum could probably understand how it works! ,,,,:-) well almost! Keep up the good work!
awesome video. when i first saw the whiteboard it looked so complex, but after listening to you about 5 min in, it looked so simple :-) great video! oh, and i got here from r/formula1 too
Very welcome!
Agreed, these vids are awesome. Thanks for taking the time to explain these concepts.
Thanks, I try to keep it accurate, though there are plenty of times where I either got lazy or wasn't paying attention in certain drawings.
Depending on the quality/materials of parts used, could be either. I would say though that manual is much more dependent on the driver than sequential.
this is just awesome, i know alot about marine diesel enginesl, but always look for a way to expand my knowledge about car engines, and this was extremely clear and easy to get. thank you. u get a like and a subscription,
Can you please explain how synchronizers work? Great videos by the way, I literally had to watch almost all of them!
i cant believe you've explained it and it made perfect sense. bravo.
Great video and explanation. Very grateful for this channel.
I found a mistake in your drawing!
a race gearbox has a straight cut ;)
i love your channel learned so much, keep on!
greetz from germany
Don't spread false. Info, he obviously knows what he talking about