Synchromesh unit (Manual Car Transmission) - How it works
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- เผยแพร่เมื่อ 7 มิ.ย. 2016
- This video explains the operation of a synchromesh unit in a typical manual transmission, detailing synchromesh (blocker/baulk ring) operation.
The Synchromesh AKA Constant Mesh gearbox is an improvement on the older sliding mesh gearbox which relied heavily on driver skill and double-clutching to not grind or crunch the gear change. The sliding mesh box was also known as a "crash box" due to the gears making lots of noise when changing.
The particular synchro unit used in this video is from a Land Rover LT77 manual gearbox but the information applies to most synchromesh manual shift transmissions in vehicles today. Synchro rings.
For the full video explanation of a manual transmission with synchromesh, see this video: • Synchromesh Manual Tra...
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It's amazing that humans are capable of making such complicated machinery. You have to be a genius at this kind of stuff to come up with a system like this.
It is amazing James. Although when it's in pieces on the shop floor and you're trying to figure out how it happened, you wish for one of those geniuses to appear and lend a hand.😉
The mind of Men.
We've been at it for thousands of years
Cause it's an accumulation of past knowledge, over hundreds of years, over multiple discipline. It's not that complicated when you pick apart each principle that works for each component. From simple stuff piled up to be more complex. That's just what engineers do. That's why there's a degree for it
Dont get me started on motherboards in your computer or ecu. But this is Quite impressive as well, its a blessing and curse to be living in this era
As much as I love 3d Animations, it is nice to see the components in action and this was honestly the first time that I got to see a working manual transmissions go through the motions with a cutaway so that you can see...Thank you for posting...
This was the best one, short and sweet. I've seen 20 minute explanations that are crap.
You have explained what absolutely nobody has done in any other video I have found. Thank you.
I am really high and this just blew my mind.
same 😂😂😂😂
Wow dude im not the only one
Higher than gas prices watching this at 1:47 am
I have rebuilt a couple of these transmissions successfully and I still am not sure if I understand just how they work. Thanks for the video. Amazing how someone or a team came up with the original design.
Got curious about synchros after midnight and this video was the best of the bunch for explaining AND visualizing what was going on. Thank you!!
Very good. Should be recommended viewing for anyone learning to drive a manual transmission car.
Thanks Colin.😀
dude sounds just like the Geico lizard.
😂
I’m in the process of rebuilding my brother’s ‘51 ford 3 speed with a borg Warner t10 overdrive. I wasn’t completely sure how his syncro’s worked, but this video makes perfect sense to me! Thank you!
Awesome! My young nephew asked me how syncro worked and I struggled to explain it, your simple but understandable explanation was a godsend, well done and thanks for your great description and video of how it works, in fact I learnt a thing or two as well :)
That's a brilliant explanation. Thanks for the video!
I own a 2017 Jeep Wrangler, and the transmission has had issues going into reverse. I took it to a mechanic, and he mentioned that it's a common problem with manual transmissions from Jeep at the time. He said it was due to the way they designed the Synchromesh.
Now I just have to redesign it so I can make new parts and fix the issue. One day....
That is really simple. And not a 3 year lecture on your life. If there was more of you I'd not want the world to burn.
Anywho, got a vid on pre-selector gearboxes?
Fantastic explanation and demo of how this works!! Couldn't quite understand how it worked until finding this video.
Awesome amazing easy way to explain a complex machine.
My son is starting to drive my car and your video was the very 1st one to make him understanding how magics works inside the gearbox. Thanks mate.
A really straightforward and easy to follow explanation. Many thanks .
Brilliant short, clear and to the point visual and audio presentation. Now I understand.
Perfectly explained, thank you.
The most wonderful simple and easy explanation I have ever seen. Thank you very much.
Short and sweet. An with slow no. Perfect.
please make more videos like this sir 🙏🙏 this was the best explanation for synchromesh gear box 👍
Best way to learn is seeing it happening. Thank you for the video.
brilliantly explained. makes sense now.
Ah, I got the missing piece to the puzzle!
Still a complicated thing if you've never worked on one before, but I know understand how they synchronise.
What a complicated thing to break down. Very nice 🙏🏽
thanks so much for the slo mo shots! really helps understand the whole process
Very clear and concise demonstration and explanation..
Thank you very much
Excellent! Brilliant to be shown with the parts 😁 I'm not doing any btw, just tease the other half about my level 4 qualifications during our auto discussions!
I didn't know Josh Widdecombe was a mechanic! Good video Josh.
You are great because your practical is best.
Love from India🇮🇳🇮🇳🇮🇳
Excellent video, many thanks.
Very good video, with cracking explanation.
Great explanation! Thanks!
Bravo . It was well explained !
Thank you very insightful
WOW... that is so cool!
nice explanation i had an issue with my car i couldnt put 1st gear easily so i changed transmision oil and clutch but still i had the issue probably it was the synchroniser but im not sure if it can be replaced..
Amazing sir , big repect for you 👏
Thats excellent demonstration! thanks a lot. U got a new sub and follower.
Thanks Mayank, it means a lot to us. Welcome to the EduMech family.
Educational Mechanics
Good video, thanks.
thank you so much sir 🙏🙏🙏
Thanks very helpeful
excellent
I am Egyptian and I am proud of your channel
انا كمان
My 3rd gear synchro really doesn't like aggressive shifts nowadays. Very cool to see why and how
Nice Presentation..❤ im going to watch it again. i need to synchronize my brain first😂
Its to much complicated for my Brain to Absorb😮
Thank you that was bad ass
Fantastic design 👍🏻
Yeah, until the sacrificial brass sychro ring wears out and you have to throw away the car... I have a RAV4 on which you have to remove the engine through the bottom to get to work on the gearbox.
thanks!
can you maybe explain /show what causes the issue with worn out syncros?
Wow great video thanku
nice channel! gonna tell my friends to sub🤘
Thnx man.
thank you
Great explanation, thank you!
Thanks Gyppor
Can u make one explaining how they wear and cause grinding !!
Amazing video! Notice how the synchro immediately matches the speeds of the dog teeth and the constant mesh helical gear. No wonder experts suggest never to rest your hand on the gear stick. The slightest movement of the gear stick towards a gear slot causes the synchronizer ring to start matching the speeds by friction. So keeping the hand on the stick causes unnecessary wear on the gear stick is in fact a very true statement!
Not only that, there's some really advanced chemistry behind the gear oil additive package's chemistry also. It has to be designed so that a friction modifier component ensures that enough friction is taking place as the synchro/gear teeth start gripping each other. Hard to synchronize slippery stuff together.
soo when I didn't fully put it in gear and heard a grind, was that the outer sleeve conflicting with the baulk ring?
how to calculate the number of teeth on the synchromesh?
Sometimes I have problem with ejecting from 2nd gear. Then I have to push shift lever little more harder to move shiht lever from 2nd gear. What can cause this problem?
Very nice. And the non-spiral gear is for reverse?
Thanks thelittlepilgrim. That's right, the straight cut gears are for reverse in this box, you can see the reverse engage on this video th-cam.com/video/JWZ6-m-N6V4/w-d-xo.htmlm8s at about 6 minutes 8 seconds.
I've owned/own vehicles that require "double clutching" as we call it here in the US from 1st to 2nd when the gear oil is cold to prevent gear clash. As the gear oil heats up from friction, I can then shift from 1st to 2nd without any gear clash. I use the engine temperature as a crude "OK to shift" indicator. Meaning by the time the engine has reached NOT, it's usually safe to shift from 1st to 2nd without double clutching. Any reason why the gear oil temperature matters?
I've got a van that is more prone to this in the winter. It requires double clutching at freezing. Once it's been driven, if can either do one of three things without double clutching. Shift from 1st to 2nd at 20 to 25mph real fast, pull out of 1st, pause for a second then shift into 2nd. Or blimp the throttle a bit after declutching out of 1st before shifting into 2nd.
Which sort of metal is the yellow mesh?
Hi, I have a problem in the gear box that escapes Ftas No. 2 what is the problem
Amazing how you explained the most essential part of a gearbox in 3 minutes.
1 question, what is worse shifting to fast or grinding the syncros to long?
Be careful buddy
I always wondered why these gears don't tear up when I shift.
But what I was wondering, and I’d be glad for a response, this system needs quite the pressure to to cause enough friction. Right? So obviously the drivers simple hand gestures must be leveraged hydraulically or pneumatically right? And what I was also thinking is that you must either be slowing down a running engine or accelerating a car, with only surface friction, otherwise the two systems wouldn’t match speed. Right? How long do Blocker rings live then? I’m sure the friction is very intelligently distributed across the maximised surface area of the blocker ring, with the shape of the lobe and all, and that the material on that part is well treated in manufacturing, in order to be resistant to such wear, but it just sounds like a really tough job for that piece of metal. Mind you my first semester of engineering still lies ahead of me some few months.
So what happens if you hear grinding or your transmission is stuck in a gear?
So say if ur going down the road at 30mph in third gear, you put the clutch down and put the car in neutral for 4 seconds and the change to 4th, wouldn't that mean that all the gears would have time to stop and cause wear since the output shaft is connected to a stationary gear? From my understanding when the output shaft sleeve connects to another gear, the output shaft will be dominent and the gears will match the output shaft untill the engine is re connected? Cheers
Yes, when the stick is in neutral with the clutch depressed, the gears will slow down due to friction. When the stick is put in fourth gear, the syncromesh needs to bring the gearbox up to speed. I usually double-clutch, meaning I let the clutch out when in neutral. Now the gears are spinning at engine speed, but aren't connected to the output shaft. I use the engine speed to rev match the input and output shafts to reduce wear on my syncros. My transmission is very old so I'm trying to reduce as much wear as possible. I then rev match AGAIN when releasing the clutch.
When u shift to 2 gear shouldnt mainshaft (with hub)be already in movement because of wheel spin ?
Hi Piotr, you're right, in a car in 2nd gear with the wheels turning, both shafts would be spinning.
For this video we wanted to show the synchro in action so we held the main shaft stationary. We tried the video with them both moving but it wasn't very clear what was happening.
Thanks.
Matt.
So many viewers with just a single one to point this out!
Here is stroboscopic demonstration of a synchronization with a rotating drive shaft:
th-cam.com/video/e-Lk3FXHubw/w-d-xo.html
i have a 2017 corvette got stuck in leaves and blew the clutch. paid 4800 dollars to fix now the transmission pops out of second gear. they say its syncros gear. now i need new trany. a pure nightmare,
Comment ça voir réparé une boite avitese
Hi, I'ved change my synchromesh for gear 2,3,4&5 twice after my first change cannot stand for few miles..how could it possibly happened? Now my transmission still got remain the same issue which is a bit hard to change to other gears since my synchromesh couldnt work properly..hope you can help me..thanks.
You probably have faulty clutch taht does not separate fully or simply don't press it all the way in when changing gears, so synchros do part of clutch's work, and they are too small and weak for that.
What I dont get is why the baulk ring doesnt need to synch with the gear in the right..it "breaks" the one in the right to same speed, but it can still misaligned doesnt it (at 1:00 i.e., they will move at same speed, but may be misaligned)? It will never be misaligned to the sleeve, but cant the sleeve hit the teeths of the gear in the right? I mean, sure point teeths make it har to collide exactly..but still, I dont think its impossible
The edges of the teeth are tapered. Once the input and output gears are spinning at the same speed, the force of the shift in conjunction with the tapering allows the syncro to slip out of the way and the gears to slip into alignment and mesh. The purpose of the syncro is to synchronize the speeds and block the meshing of the gears until the speeds are synchronized.
Also, the gear on the right is permanently connected to the drive shaft. The gear on the left is disconnected from the engine by the clutch. The synchro is adjusting the speed of the left gear to match the right gear, not the other way around.
to refresh..
huh, neat.
No wait I got it now
She was right... There is a piston looking spring in their somewhere...
P. K. H. "SYNCHROMESH TRANSMISSION'S" on Manual Transmission's.
P. K. H. "SYNCHROMESH TRANSMISSION'S" on Manual Transmission's.
🎉
I still have no idea
Synchronizers match the engine speed so it doesnt grind.
Ford escape hybrid
MISTER PAUL KENNETH HAMMOND MALE, HUMAN, PERSON'S SYNCHROMESH TRANSMISSION VEHICLE'S.
Thanks USA of transmission in a Nissan.
Painfully simple lol
😂
now do a video on enunciation [ih-nuhn-see-ey-shuh n] .. to utter or pronounce (words, sentences, etc.), especially in an articulate manner