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
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.
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.
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.
+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.
@@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.
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
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
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.
Excellent video. This is why when reassembling a tail shaft, it is very important that the marks on the slip joint line up, so the angles on each end also match
I needed to figure out a way to transmit rotation to another axis without bevel gears and I had no idea how great universal joints were until this video. Thank you so much! You fucking rock!
@@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.
I didn't know, I didn't know how a universal joint worked. Lots of pennys dropped like why on cars its a different joint called a CV joint constant velocity. Why the yolks have to be lined up. And why the input and output shafts have to be parallel. OMG. Thank you sir and thank you youtube for the recommendation.
friggin awesome. i never really noticed that u joints have this kind of motion. think of the green dot moving back and forth on one edge of a triangle and the red dot moving on the hypotenuse of the same triangle (thats a fancy word for long side yall :) . since the red and green dots have to move those distances in the same amount of time... the green dot moves faster
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 😊
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.
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
+unknownvector1 And why do you believe the animation to be accurate? I have seen many animations where Wily Coyote somehow hangs in mid-air before starting to drop; is that factual?
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.
Think about a 10 tons truck fully loaded climbing a hill. All that mighty power goes thru that little metal cross. Tons of torque trying to bend that little piece. Amazing.
Thank you for these videos. I, along with many other instructors have been tasked with converting what are normally lab activities to online lessons in a very short period of time. I certainly appreciate your site as a resource of accurate, clearly explained information.
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.
Such an excellent video I have ever encountered with! It is explained with simple graphs and simple explanations, as well as supported with a simple video, I really enjoyed it, and I am so grateful :)
With a double universal joint it is very important that: 1. the yokes of the middle piece need to be in one plane 2. the angle of the first joint must be the same as in the second joint. This give you the form of either a Z (as shown in this video) or a W (of some sort) also: the middle piece still travels with fluctuating speed thus fluctuating accelerations thus fluctuating torque by inertia. So you want to have the middle piece as light and compact as possible to reduce inertia.
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!
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?
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
Upping my Lego mindstorms game
Wait hello what
oh
Ikr
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
"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?
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"
this video turned a simple concept into a total mind fuck........thanks :D
always trust americans to do that lol
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
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.
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
This is simply brilliant. Really explains the non-constant velocity perfectly.
Another superb explanation...You made Understanding Mechanical really easier.
"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
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
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
Thank you, I had no idea about the fluctuation in speed etc, especially the last minute was very helpful!
3:21 you may have outsmarted me but I outsmarted your outsmarted
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.
Excellent video. This is why when reassembling a tail shaft, it is very important that the marks on the slip joint line up, so the angles on each end also match
You've just make my understanding of the world more complicated.
Don't know why I needed to know this but I now feel empowered.
keep it amazing man, your voice makes me know I'm about to get better
Great job.
I am a Uni joint manufacturer but never knew why do people use double joints.
I needed to figure out a way to transmit rotation to another axis without bevel gears and I had no idea how great universal joints were until this video. Thank you so much! You fucking rock!
Now I have understood U-joint in a better way. Thank you for making such a video.
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.
Wow. Never thought that mathematical abstractions could solve mechanical challenges with such ease. Thanks for sharing.
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.
This video has made a huge difference to my understanding of this joint! Along with helping me complete my course work, many thanks.
This video showed up randomly in my recommendations. No regrets at all :D
Ive been looking for a way to make the fluctuating speed constant again, I can’t thank you enough!
I didn't know, I didn't know how a universal joint worked. Lots of pennys dropped like why on cars its a different joint called a CV joint constant velocity. Why the yolks have to be lined up. And why the input and output shafts have to be parallel. OMG. Thank you sir and thank you youtube for the recommendation.
INCREDIBLY interesting and informative!
Dunno why this was in my feed, but, I'm impressed by it.
Nice video, especially after smokin some good universal joints 🤙
I needed this video in my life.
friggin awesome. i never really noticed that u joints have this kind of motion. think of the green dot moving back and forth on one edge of a triangle and the red dot moving on the hypotenuse of the same triangle (thats a fancy word for long side yall :) . since the red and green dots have to move those distances in the same amount of time... the green dot moves faster
Thanks so much for posting! This is a concept that I think very few professing professionals even have a clue!
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 😊
Double universal joint is very interesting and important
My mind just got blown. I would have never imagined it wasn't 1 to 1
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.
Very informative and easy understanding
Thank you. I am trying to build a Lego articulated suspension system with steering. You have helped me understand the universal joints.
please keep thermal related videos....your animations are simply superb....
I have never thought this would have been this much complex
---- From Corona Quarantine
So that’s how they get constant velocity to the wheels, the axels 👍🏿 thank you.
My teacher always told us to use two for balance. I sorta imagined it was something like this but this is a nice video!
Great video. Learned something today. Thanks
Thanks TH-cam for allowing me to nerd out when I least expect it.
Wonderful animation! Made the concept clear as day!
Your explanation were so clear. Awesome dude!!!
very nice animation to show the working!! it would even be better if equation for the velocity were shown or derived...
Very useful for my final exam, Thanks!
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
Thanks for your support
I clearly understand about universal joint. Thank you
Awesome 👍👍 its so easy to understand. I'm glad i opened youtube to find out. And I'm logging without any other video 😁
It is clear that this video helped me alot
Awesome work.
Please continue the job.
Thanks for the interactive animation and explanation !
Wonderful! Thank you from Texas!
Finally my curiosity has been answered, nice animation
+unknownvector1 And why do you believe the animation to be accurate? I have seen many animations where Wily Coyote somehow hangs in mid-air before starting to drop; is that factual?
Don't know how I ended here but I'm glad I did.
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.
This explains why a double cardan joint is used in some mechanical applications. 🔧
I loved these videos. Thank you for this video uploader! 🤗
Think about a 10 tons truck fully loaded climbing a hill. All that mighty power goes thru that little metal cross. Tons of torque trying to bend that little piece. Amazing.
Thanks that was well explained. Good work.
THANK YOU VERY MUCH!
i feel much better having understood this
I have always wondered how that works... omg thank you
Thank you for these videos. I, along with many other instructors have been tasked with converting what are normally lab activities to online lessons in a very short period of time. I certainly appreciate your site as a resource of accurate, clearly explained information.
Why am i watching this at 2 am
Either way, that was some good narration and good explanation, thank you
Excellent video...thanks for sharing.
I love that this is recommended to me
Amazing animation with lovely explanation :)
Great video!!! Congratulations, It now I can understand how a universal joint works
In your channel all videos are good
Fentastic animation
Thank you very much.
Effort much appreciated.
Nice cross joint sir
awesomely explained
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.
Such an excellent video I have ever encountered with! It is explained with simple graphs and simple explanations, as well as supported with a simple video, I really enjoyed it, and I am so grateful :)
Please do a video on constant velocity joints!
3:14 there he talks about CV joints
Gracias TH-cam por tus recomendaciones en 2020
With a double universal joint it is very important that:
1. the yokes of the middle piece need to be in one plane
2. the angle of the first joint must be the same as in the second joint. This give you the form of either a Z (as shown in this video) or a W (of some sort)
also: the middle piece still travels with fluctuating speed thus fluctuating accelerations thus fluctuating torque by inertia. So you want to have the middle piece as light and compact as possible to reduce inertia.
output speed is different?! mind blown, so that's why pinion angles on cars is so important!
Thanks for this video love from India
Very clear and interesting
Now this is the kind of "joint" I'm talking about!
very well explained
Excellent information.
Still bends my mind
i already seen it on my job but never understand the purpose of 2nd joint now i know thanks.
outstandable!!!!!!!!Thanks Learn Engineering
excellent explanation...thank you very much.......
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.
more complicated than I thought it would be
Ur explanation is suprb