Limited Slip Differential Explained

[@EngineeringMindset]

*These videos take a long time to make* if you would like to buy Paul a coffee to say thanks, link below: ☕ PayPal: www.paypal.me/TheEngineerinMindset Channel membership: kzbin.info/door/k0fGHsCEzGig-rSzkfCjMwjoin Patreon: www.patreon.com/theengineeringmindset

[@bustjanzupan1074]

What about braking the smallest gears instead of the axles's gears ? Is that an option ? Thank you 4 the video.

[@chedrwastaken]

this is the first time i understood a concept the first time i watched an explanation on it usually i have to watch it a couple times to fully grasp it but now i can make a lsd

[@TRHARTAmericanArtist]

This is a wonderful channel. So glad I found it.

[@NavajoNinja]

Ur videos wouldve been so helpful for me as a young man. I grew up house to house and joined the military at 17. When i came back as a 24 yr old, i knew nothing about vehicles and had no driver license yet. I remember that poor honda civic that learned on. Ha. Good times. Now As a 40 yr old, i know good a pretty good deal about vehiclesnow but still learning. Great videos as always. 👍 PassOnWhat You Learn so Others After You Falter Less.

[@Raven-cf5qd]

Sorry a little bit confused with the last bit so you're saying that when the inner wheel applies resistence to the power it allows the clutch to slip right? Does that mean if the vehicle is doing a sharp turn on a slippery surface that the both wheels will remain the same speed and cause slippage?

[@CommercialGasEngineerVideos]

Thanks. This channel covers so much.

[@plaws0]

60 years or so ago, the Beach Boys had a song titled "409", the displacement of the V8 in the hot version of the Chevrolet Impala. Go dig up the lyrics - they include a reference to General Motors' trademark for their limited-slip differential ...

[@joeljenkins2618]

This video is close but misses some important key details. The clutch packs are lightly locked with the preload force so that in a straight line the wheels turn at the same speed. The force of the outside wheel trying to turn at a greater speed overcomes the resistance of the clutch pack, yeah not the best explanation. An LSD uses helical spider gears which transmit both a tangential force to turn the drive gears but also an axial force to push the drive gear outwards. The greater the resistance from the wheel with more traction, the greater the axial force the pinion gear is providing to the drive gear on that side, which in turn is pressing outwards on the clutch pack, locking the case and the drive gear together and transmitting more power. As the other side has less torque transmitted there is less axial force compressing the clutch pack and more slippage can occur

[@garybrown2039]

Hey there engineeribg mindset. Love your videos, especially the ones involving electricity. By any chance do you guys plan on doing a video where you make an AC motor? Because your video where you made a DC motor was awesome.

[@yensteel]

Thanks for the video! Just wondering, would the friction pads wear off and need to be replaced? How commonplace are limited differentials now?

[@hojnikb]

on normal passenger cars, they are not that common. You can simulate LSD with an open diff using ABS/ESC. This is done by slightly breaking the free spinning wheel, so the torque transfers to the one with more grip.

[@NevilleFuckenBartos]

Yes, on later Holden Commodore diffs. They are rubbish.

[@alanhonlunli]

@@hojnikb wouldn't call it a simulation since the effect is the opposite of an open diff.

[@alanhonlunli]

They do wear over time, but are generally overbuilt to last the life of the the car. In general, the differences in forces between the left and right side of the car are not great enough to induce much wear on these friction pads during normal driving, as opposed to a transmission clutch that has to deal with the forces of accelerating a car from a complete stop many times over the course of a trip. They're kind of a premium performance item, so you'll likely find them in more expensive sports cars. As we transition to electric motors, you'll see them less, as we can put individual motors on each wheel and modulate torque that way instead.

[@yensteel]

Thanks a bunch guys!

[@electronic7979]

Excellent video

[@nickayivor8432]

SUBSTANTIAL The Engineering Mindset Thank you From Nick Ayivor from London England UK 🇬🇧

[@juperrr]

What if you have the limited slip differential on the front side (where you also have the stering). Does it work the same as on the back side, where the wheels are always parallel to one another? I mean in a situation where the wheels are steered. Does it also prevent sliping in that situation? I am asking this because you said that friction "adhesion" between the clutch disks and friction plates is broken when they are running at different speeds (00:02:13), so in theory there would be no adhesion left when the wheels are steered and you will end up drifting.

[@alanhonlunli]

When you turn, the difference in the radius of the turning circle of the inner and outer wheel causes the outer wheel to have less rotational resistance. The differential will respond to that by sending more torque to the outer wheel. Rear wheels feel the same difference because even though you don't steer with them, they still have different turning radius, and the outer wheel will still need more torque to turn the wheels more in the turn. In a drift there are slightly different forces on each wheel even though they're all sliding, mostly due to weight transfer. An open diff will prevent wheels that have more friction from receiving more torque to continue the drift so in theory, it should help those wheels catch the road and stop the sliding.

[@juperrr]

@@alanhonlunli I understand the part about the back wheels having different speeds even thought they are paralell to one another ( thing that happens when the car steers, etc.) but my main question is: does the limited slip differential prevent sliping in a situation where the car makes a turn and the outer wheel (the one that has the bigger radius from the center) encounters a surface that the wheel cannot grip onto, like a pudle of water while the other wheel is on a surface that has no problem griping onto (like rought asphalt). The video kind of made the point that the outer wheel (needing more power to finish the corner because it has more lenght to travel) , will have its clutch disks breaking the adhesion to the clutch friction pads and so the differential cannot prevent slipping anymore because once again the adhesion between the friction pads and the clutch disks is broken ! quote from 00:02:02 "However, if a certain amount of force or torque is aplied to the wheel than the two disks will brake the temporary joint and slip past each other"

[@alanhonlunli]

@@juperrr when a car with an lsd hits a puddle of oil at the outer wheel during a turn, the car will lose grip at it highest point of contact, causing it to slide and understeer. The outer wheel which is already receiving more torque will get additional torque due to the loss in rotational resistance, but the lsd clutches will kick in and prevent that from happening. The clutch will direct some of the torque back to the inner wheels to allow the car to complete the turn. Because the outer wheel is coated in oil, it will continue to spin faster than the inner wheel, which will keep the clutch engaged, and divert torque to the inner wheel. The car remains drivable and controllable due to the limited slip. This scenario will produce understeer, understandably since the car is losing traction during a turn.

[@soku330]

That would be called front wheel drive

[@thyagarajanv]

Assuming the car keeps going in a circular track of say 10 m radius in a clockwise direction seen from top will the left clutch wear out fast or the right clutch?

[@Sinpsycle]

My cousin Vinny!

[@DrR1pper]

Why wouldn't the resultant effect of the LSD also defer to an open differential effect when going over the patch of ice for one of the wheels? Shouldn't it be the same as when turning a corner since there will be a difference in resistance between left and right bevel gear from difference in traction?

[@seemslegit6203]

Its the other way around i think

[@rand49er]

Can a non-limited slip differential accept the clutch packs and be turned into limited-slip diff? In other words, are those splines present in an open diff?

[@sayochikun3288]

my guess is no.

[@alnea]

It would be unnecessary to have open diffs with the splines already in! If a manufacturer does an open diff it will definitely come as simple as possible and avoid useless additions that cost money

[@RadjivDewnarain]

Which oil you use for the lsd diff

[@justlisten82]

A whole different kind of LSD 😉

[@ZILAwelds]

Just weld the spider gears ! Then you always have plenty of traction …..!

[@mikechiodetti4482]

And it does a great job till the friction material is gone. I like my ARB air locker. The diff is open till the air locks it. Great for 4 wheeling.

[@mattrodgers4878]

Dual quad 4 speed positraxtion 409

[@kennsnthumbi6947]

I think limited slip differential is better than open ones

[@joshuaewalker]

I like turtles

[@ocelotMartinez]

This explanation is idiot (me) proof!! Thank you!!

[@Boraxo]

And when the clutch pack wears out, the axle gears move outward away from the spiders. Not corrected, they can move enough to start skipping. Skip hard enough and it can crack your pumpkin. BTDT.

[@ExMachinaEngineering]

Not a great explanation. It is given in a way that can lead to misconceptions.

[@bewertsam]

Elaborate?

[@ExMachinaEngineering]

@@bewertsam Too long to elaborate. But open diffs do no respond to torque necessarily. They respond to rotational speed. Also look up LSD with ramps. Spring preloads are not used today and I don't know that they were ever used in a mass produced solution. More of a homemade racecar solution.

[@VictorEstrada]

@@ExMachinaEngineering seems to me like you're just trying to get attention. Open diffs allow all rotational power to go to the wheel with less resistance, not too difficult to understand that. LSDs fix that problem.

[@ExMachinaEngineering]

@@VictorEstrada Riiight... The fact remains that open diffs send more torque to the wheel with the higher rotational speed. That might seem insignificant to you but it is a major distinction. And a source of a common misconception. Like the one saying that in a straight line at speed an ice patch would cause one wheel to spin. It is highly likely that a small patch, when the vehicle is not accelerating will not cause anything of the sort. Also, LSDs do cause understeer exactly because they slightly hamper that rotational differential behaviour needed to corner freely. All of them except torsen or geared LSDs, which is a technology completely different to the clutch pack and preload shown here. So many tiny inaccuracies which could lead someone to have a skewed idea of how a diff works.

[@alanhonlunli]

@@ExMachinaEngineering actually, the open diff is not responding to rotational speed, it's rotational resistance. The torque will go to the wheel of least resistance (tire friction).

[@yaminsiddiqui4690]

damn this is really usefull

[@vive.kumar.sharma]

🙏

[@engr.bamboo7798]

Libog man

[@alfspacealiencateater4786]

Build a locker and learn how to drive