ฝัง
- เผยแพร่เมื่อ 30 ก.ย. 2024
- Help us to make future videos for you. Make LE's efforts sustainable. Please support us at Patreon.com !
/ learnengineering
The working of Universal (Hooke's) joints has been a mystery to most of the people even though it was invented many centuries ago. This video clearly unveils the physics behind it in a simple and illustrative way with help of animation.
Like us on FB : / learnengineering
Voice-over artist :www.fiverr.com...
Your support is invaluable for us, let's make a closed community www.patreon.com/LearnEngineering
Hey, your videos have helped me a lot,seeing that you are an Indian , I felt proud,so I decided to make a contribution ,but as patreon will charge my card in foreign currency, that will just be a waste of money,instead if you could just let me know your UPI id, I will contribute directly as much as possible every month!
email id: jangaleabhi@gmail.com
Thank You So much keep making great content!
Can do you make your rear wheel drive vehicle move if one of the rear wheel is net having firm contract with ground?
Universal joint: I'm complicated
Automatic transmission: Hold my planetary gearset
*proceeds to break down at 10 000 km*
I have an automatic bike. Been 6 years and zero problem other than the odometer, speedometer, and the old battery lol.
@D ʝả ħ AT's are for people who have better things to do with their lives than wasting time shifting gears
@@Vi-pv3xi automatic bikes use cvt and not planetary gears
you sound like a lazy american
Upping my Lego mindstorms game
Wait hello what
oh
Ikr
"Now you understand how an universal joint works. Thank you."
No. Thank YOU!! :oD
+masterimbecile Exactly what I'm thinking after every single LE video. "...Thank you."
NO! THANK YOU!!!
:D
gabrocki Same here.
masterimbecile
Me neither
There are literally three parts...feels sad to be silly huh?
this video turned a simple concept into a total mind fuck........thanks :D
always trust americans to do that lol
I understood the basic concept of a U-joint, but had no idea that the output speed wasn't constant. Very interesting. Thanks for the video!
now,,, why the output speed iznt constant?
VontekSRB because the propeller shaft is inclined to transmission shaft, so due to that there will be not the exact transfer of rotating speed or motion. And thus in final drive also the angle will be different hence no constant velocity.
I had trouble as well seeing why but imagine If you push something straight along a line determining it's speed or pushing it at an angle compared to the line. Even if you push it just as hard, you will cover less distance in the initial line's direction and thus your speed will be less in that that direction. Now imagine you zigzag push the object compared to the line. Your relative speed will vary, depend on the angle compared to the line you're pushing along. Regardless of giving a linear, unchanging push on the object. This is the same principle as the constant torque, constant velocity input of the input shaft giving a fluctuating velocity output when the output shaft is at an angle. Resulting in jerky rotation.
so true. im wondering now how a front engined rear wheel driven vehicle can operate so smoothly and the final part of the drivetrain is not jerky.
DangerDaveFreestyle I'm wondering if the rear drive shaft having two U joints gives it the same effect. The front U joint that is up by the yoke to the transmission and the rear u joint going to the rear differential. Does that make a driveshaft a CV (constant velocity) axle without the name?
One thing that should be noted in the last example (double U joint): The input and output shaft have to be parallel for the velocity to remain constant.
In other words, along the same axis of rotation
In other words, along the same axis of rotation
This has absolutely NOTHING to do with my education but I still watched the whole thing xP
+XelPixels Your education has NOTHING to do with your life, the universe and everything, so good that you watched till the end.
+Aditya Mehendale no offense, but that comment was just stupid.
+XelPixels No offence taken; I was just feeling stupid at the moment. Or maybe wise.. or just "wiseass". Who knows.. IMO, though, cool video/concept is cool - you don't need ratification from your 'education' to enjoy it.
+XelPixels Actually, there really was nothing stupid about that comment. No offense.
There's no need to stay stuck to a matter,you would be surprised at how much you can learn and be good at
You missed one very important point! The angle of the outputting universal joint must match the angle of the inputting joint. This problem was the source of some vibration concerns with some RWD vehicles and I have seen quite a few "Raise Kits" put on the rear suspensions of cars and trucks that did not take this into consideration. Some of those vehicles shook so violently they would loosen the fillings in your teeth!
The concept of the constant velocity joint was used in the 60's and well into the 80's with what was called the "Cardigan Joint' and it had a very short piece of shaft at the front of a lot of driveshafts on GM RWD cars. A bit more complicated than this video showed, it served pretty well to eliminate vibrations caused by angle variations as long as the final output angle to the differential was under 1 degree.
Exactly. I'm facing vibration problem in my car due to universal joint
"Cardan joint", not cardigan.
"it is clear"
"Understanding Universal Joint": 82.230 views
"Jen Selter makes squats": 129.655.342 views
Natural selection at its finest...
i would put my universal joint in Jen Selters spline.
yo culpo a los padres
I will watch the Jen Selter squats right after this video
butts are more universal than universal joints
Now I understand how offroad vehicles can flex so much, thank you!
But do you underatand how body builders flex so much?
@@sam_s_ MMMMMMM NO
@@sam_s_ congratulations for roasting a 5 year old comment, plenty of them left
@@csibesz07 I wasn't roasting their comment. Their comment was perfectly fine. It just made me think of a stupid joke. Relax or I'll have to flex on you.
Another superb explanation...You made Understanding Mechanical really easier.
So is it correct that, in a double universal joint, if the last rod (or whatever you call it) is not in line with the first rod, this will have a fluctuating output?
yes the angles must be the same.
Zach A Thank you.
but why will it have fluctuating output due to angles? its not like there is a output power loss from hitting angled rod, creating pressure in wrong angle,the cross does the work of automatically transfering same amount of rotation cuz itz stiff cross
VontekSRB yes due to angles which causes cyclic variation in speed
3:21 you may have outsmarted me but I outsmarted your outsmarted
This is great, thank you for teaching me for free, you deserve more subscribers
There were ads. Not free.
@@vv8104 i think he was referring purely to lack of currency transactions, which is the common way the word "free" is used. In that case it is free, but I understand your point.
At 03:08, your graph shows a non-symmetrical addition and subtraction of the input speed. Not only are the positive and negative peak amplitudes of different magnitude, the area under each peak is also non-symmetrical. I would have thought that the velocity deviation should track the sine of the displacement angle, and that the positive and negative graph curve segments should be symmetrical.
Thank you, I had no idea about the fluctuation in speed etc, especially the last minute was very helpful!
Many years ago they taught us this at school, when disassembly the shaft always mark the parts and spline with a file so they go back exactly the same, otherwise the Jerky Motion will ruin the drive shaft. Pretty obvious. I hope kids are still taught these basics mechanics
This is graduation stuff. Not taught at school
INCREDIBLY interesting and informative!
What about on a drive shaft with three U-joints, would that still equal the same output velocity? On many trucks there are three U-joints per shaft
The third joint has no angle so you still only have two angled joints.
Oh good point I didn't even think about that
Dude kind of sounds like 343 Guilty Spark from Halo minus the English accent.
This should be the next fidget spinner. Ball bearings are lame, univeral joint is way cooler to fidget with
Hello, nice animations, can you tell us witch program did you use to make it?
The animation is nice but to be able for a universal joint to create constant output you need to turn one of the joints 90 degrees relative to the other around the turning axle.
If you look at light-duty 4x4 trucks from decades ago (50s, 60s, and early 70s), the transfer case was tilted down toward the rear to reduce the angle of the U-joints in the rear drive shaft (the shaft with the greatest need for running efficiently), but this increased the angle of the U-joint on the front side of the transfer case. To accommodate that, they tilted the rear (input side) of the front axle downward. This rotation of the axle position away from the position that "looks right" increased the angle of the U-joint at that location so it was a close match to the steep angle of the U-joint at the front of the transfer case. It's a setup that looks very strange if you don't know the reason, and this video explains the reason.
They didn't mention the fact that you need a spline shaft for these things to work. As it goes around it also moves in and out a tiny bit and slides on the spline.
This is simply brilliant. Really explains the non-constant velocity perfectly.
What is the purpose of a double universal joint if you can get the achieve the equal output velocity as shown in the beginning of the video?
Also, what common mechanical systems make use of such joints?
Please do notice that first one was a case when Shafts are in the same plane. But double universal join us for shaft in two different planes.
Uses : Automobile shafts, conveyors etc
این مینگ بینگ. سینگ. بینگ بینگ. یس یس. بله. اوف اره اینااا شت. گوگولی مگولی 😥👌👌😜😄😄
This video showed up randomly in my recommendations. No regrets at all :D
You've just make my understanding of the world more complicated.
Nice,,👍
Please do a video on constant velocity joints!
3:14 there he talks about CV joints
Is this patented or anyone can use this design freely? And how much efficiency is lost per joint?
I'm no IP lawyer, but I feel like the Universal joint mechanism is not exactly patentable on its own. If, say, you had a problem which you uniquely solved via the use of a universal joint, you could patent the mechanism, including the joint, for that purpose, but you can't put an outright ban on others creating the mechanism for any other use.
Secondly, conservation of energy states that the work done must be equal to the work in. The mechanism itself doesn't lose energy between input and output, and the efficiency of the mechanism in the real world is subject to the friction coefficient, level of play, and state of the components at the time. It's difficult to give an answer really, though I would imagine it's quite a high efficiency because you're not transferring between forms of energy, it's all kinetic.
I’ve seen this video 10 times. I’ll accept that there’s a fluctuating speed and still not know why
The green dots spin with a constant velocity, because we assume it at the beginning of the video. The red dots spin with the same velocity of the green ones, because they're part of the same rigid body, which is the cross, PLUS the wobbly motion induced by the angle between input and output shafts. So, since the motion of the red points is a constant motion PLUS a variable motion, it comes that the total of the two combined motions has to be variable.
Ooooooo my gosh .......
Never knew that the speed on the output shaft isn’t constant after changing the angle 🤷🏻♂️
Thanks a lot dear for uploading this informative video 😊
output speed is different?! mind blown, so that's why pinion angles on cars is so important!
Thank you very much.
Effort much appreciated.
very nice animation to show the working!! it would even be better if equation for the velocity were shown or derived...
Nice cross joint sir
It seems like everybody is here because they were curious. Not because they actually needed to know. And I think that is great.
The algorithm
Nice video, especially after smokin some good universal joints 🤙
This explains why a double cardan joint is used in some mechanical applications. 🔧
I don't know why, but I clapped after finishing this video. Hahaha. Great videos, man.
Universal joints are used for the steering wheel connected to the wheel arms and u joints are also used for transferring torque to the wheels when the u joint is connected to from the transmission to the drive shaft
Wouldn't having the final setup defeat the purpose of a universal joint? Because then, the axes of rotations are parallel. Why not just use a belt/chain?
One good use for a double u-joint is in a rear wheel powered vehicle. joint at the trans and a joint at the rear differential. A belt won't work there because of the need for the axis of rotation to move about even though they are still parallel.
I see, the segment between the 2 joints would be extendable? shorten or lengthen depending on the movement of the segment near the differential. is that correct?
In a car, the rear axle moves straight up and down while the drive shaft (segment between) moves in an arc (with one end unmoving up, down, left or right). When the axle is all the way up or down the distance between the two joints is longer than when the axle is in the middle of its travel. So to combat this the manufacturer puts a slip joint in the middle of that drive shaft to allow the 'middle segment' to stretch as it is required. Or for a shorter answer to your question: yes.
I loved these videos. Thank you for this video uploader! 🤗
The video is exactly what I needed. He didnt just explain the parts and purpose of the U join, like most other videos, but he also talked about the physics
keep it amazing man, your voice makes me know I'm about to get better
I needed this video in my life.
Voice over is terrible. Very obviously robotic, with poor writer... "distracting, input, output, compute, failure....."
Was thinking about car steering and couldn't figure out how their physics worked. Couldn't you just use two gears though?
look up four bar mechanism and you will understand it. When the car makes a turn say left, the left wheel turns more than the right wheel. A four bar mechanism makes this possible with suitable lengths
But shaft A has to be in plane with shaft C, right?
+Black Jamal Parallel, but not necessarily in the X or Y planes. In the common example of an automobile drive shaft, the driven shaft is parallel to the drive shaft, but is lower to the ground. It could also be offset, that is, not along the centerline of the vehicle.
@Learn Engineering What s the torque loss approxiametaly for 90 degree universal-joint???
Double universal joint is very interesting and important
The only bad thing about this channel is:
It doesn't provide learners with subject-wise content.
Ive been looking for a way to make the fluctuating speed constant again, I can’t thank you enough!
so this means the drive shaft (middle part) intrinsically vibrates when spinning? now i know why my car vibrates....
Thank u fur making me 2 understand about eat.😀😁😄😄👍👍👌👌✌✌👉👈👏👏👏👐
By this example, how does a steering front axle (where the axle shaft has a single U-joint) work? The tire certainly does not change speeds when turning....
I know 553k people didn't really understand this. Thumb up anyways.
So if you reverse it and add a steam engine, you could have a perfectly constant speed output from a fluctuating steam powered input.
I've been searching for this for over a year and now finally I know how a fwd is able to steer while powering the wheels
They use CV joints, quite a different animal.
Your videos are great at explaining! I just wanted to know, is the cross allowed to rotate at both the ends? Or can it only rotate about the green ones shown in the video?
they probably have to both be able to rotate
How do hinges, pivots, and joints work in machines? Do they mimic muscles or are magnets and spring involved?
Я понял следующее. Ведомый вал (пи несоосной передачи) крутится с импульсными ускорениями-замедлениями.
Dullabh Commercials is one of the leading manufacturing & export houses from India. Our export products are in accordance with international standards and have been satisfying the needs of our customers worldwide. Our experience of more than four decades and innumerable contacts enable us to provide our clients with the best of the leading suppliers of Spare parts to the Indian and world automotive industry. We are also among a leading Cardan shaft manufacturers in India.
Well, saying that it's useless if used single joint per shaft is quite a bit wrong. Many motorcycles use shaft drives with only one U-joint. The way it works is it's at a very low angle when ridden normaly, only bumps makes it go at a higher angle, wich does not last very long and at that moment throttle is released.
Im literally just looking this up because universal joints just mess with my brain. Even if i understand it, it looks like it shouldnt be able to move like that
Thank you. I am trying to build a Lego articulated suspension system with steering. You have helped me understand the universal joints.
Put more simply; the added joint cancels out the speed variation by providing an equal and opposite variation.
Could you explain wide angle shafts! As there are three universal joints on a wide angle pto shaft and they are considerably smother than a cv shaft with 2 joints, how do the output speeds equal out in this shaft?
Just few of us humans are brilliant and only they pull us forward, wile the majority of us are simply idiots going with inertia.
So many videos... Which do i watch first?
3:15 I was thinking at some super complicated mechanism to solve this proplem and my man just slams another joint in it but backwards
Its 12:08 am here in California why the fuck am I here watching this?
green shaft turn along vertical plane, not for me because I tilted my phone left about 30°
вот эти вот объяснения с графиками, которые на самом деле нихуя не объяснения, как я это люблю, ммммм
I used the fluctuation to destroy the fluctuation
awsmmmm
Oh that's why there will be two U joints connecting propeller shaft from engine to rear axle for constant speed
How imaginary number are related in this equipment 😇😇😇😇🙂
I have never thought this would have been this much complex
---- From Corona Quarantine
What software did you use to create this cool animation ?
ok but if the 2nd joint turns another 45 degrees so that the total assembly is a 90 degree turn does it turn into a super fluctuating input
this video should have been longer, because the variable speed and the angles dealing with the rotation were difficult to follow, i got little out of this.
All well and good but what happens when you don't phase then properly and why is it important to phase them properly in the first place
Can do you make your rear wheel drive vehicle move if one of the rear wheel is net having firm contract with ground?
Can do you make your rear wheel drive vehicle move if one of the rear wheel is net having firm contract with ground?
Can do you make your rear wheel drive vehicle move if one of the rear wheel is net having firm contract with ground?
The red sides of the cross, does it spin a few degrees back and forth or a full 360 degrees
Watching a almost useless video ever and has a unskippable commercial
Whoever engineered Toyota Tacomas should watch this video.
Up next: how does a Democrats brain work?
Video length 0:15
Would help the visual if there were tick marks on the green & red dots so you can see the rotation of the cross.
Do you use oil to facilitare forward spin and reverse spin of the joint inside the yokes?
حط ترجمه عربي
I understand all four ends of that cross are rocking back and forth to a vast rate. Not rotating of course.
Instructions not clear, dog lost in refrigerator, send help and more food.
Great video. Plz tell What software you used to make this video
I've got some Qs if anyone can help:
1) Why are UJ still used today?
2) Are UJ typiclly used for RWD cars whereas CV joints are normally for FWD cars?
3) Why is the driveshaft angled as opposed to being straight? Is it due to the placement of the engine and rear passenger space considerations?
Thanks guys!
u joints are cheap... like $15 gets you a brand new one. cv joints... 10x that cost easily.