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.
@@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.
+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.
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
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.
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.
@@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.
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
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
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!
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
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 :)
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.
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.
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.
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
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
+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?
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?
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
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.
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.
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.
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!
Please explain how a constant-velocity (CV) joint works. For a front-wheel car describing how it works at the trans-axle end as well as the wheel hub end.
Front wheel drive cars have constant velocity joints for changing wheel angle directions while maintaining a constant velocity output. I was hoping to see a comparison of this cross design to that of the car's design which uses ball bearings.
I understand that at 2.30 , the green spot has the same direction spin as the cross. Why at 2.42, the green spot does not has the same reverse spin? Doesn't the spot is the same shaft end? I am trying to figure out the bearing movement on the cross. Should it has repeat forward+reverse rotation or a continuous 1 direction rotation?
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?
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
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
"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?
Upping my Lego mindstorms game
Wait hello what
oh
Ikr
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.
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
this video turned a simple concept into a total mind fuck........thanks :D
always trust americans to do that lol
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
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"
Another superb explanation...You made Understanding Mechanical really easier.
This is simply brilliant. Really explains the non-constant velocity perfectly.
Thank you, I had no idea about the fluctuation in speed etc, especially the last minute was very helpful!
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.
keep it amazing man, your voice makes me know I'm about to get better
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
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.
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
3:21 you may have outsmarted me but I outsmarted your outsmarted
You've just make my understanding of the world more complicated.
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.
Now I have understood U-joint in a better way. Thank you for making such a video.
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
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!
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
This video has made a huge difference to my understanding of this joint! Along with helping me complete my course work, many thanks.
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 :)
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.
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 😊
Don't know why I needed to know this but I now feel empowered.
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.
This video showed up randomly in my recommendations. No regrets at all :D
I needed this video in my life.
Wow. Never thought that mathematical abstractions could solve mechanical challenges with such ease. Thanks for sharing.
INCREDIBLY interesting and informative!
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.
Ive been looking for a way to make the fluctuating speed constant again, I can’t thank you enough!
"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
Awesome 👍👍 its so easy to understand. I'm glad i opened youtube to find out. And I'm logging without any other video 😁
Nice video, especially after smokin some good universal joints 🤙
Dunno why this was in my feed, but, I'm impressed by it.
My teacher always told us to use two for balance. I sorta imagined it was something like this but this is a nice video!
Thanks so much for posting! This is a concept that I think very few professing professionals even have a clue!
please keep thermal related videos....your animations are simply superb....
very nice animation to show the working!! it would even be better if equation for the velocity were shown or derived...
Why am i watching this at 2 am
Either way, that was some good narration and good explanation, thank you
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.
Your explanation were so clear. Awesome dude!!!
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
Thank you. I am trying to build a Lego articulated suspension system with steering. You have helped me understand the universal joints.
Wonderful animation! Made the concept clear as day!
I loved these videos. Thank you for this video uploader! 🤗
My mind just got blown. I would have never imagined it wasn't 1 to 1
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
Great video. Learned something today. Thanks
So that’s how they get constant velocity to the wheels, the axels 👍🏿 thank you.
Double universal joint is very interesting and important
Very informative and easy understanding
Thanks TH-cam for allowing me to nerd out when I least expect it.
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?
I have never thought this would have been this much complex
---- From Corona Quarantine
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
It is clear that this video helped me alot
Very useful for my final exam, Thanks!
Awesome work.
Please continue the job.
Thanks for your support
I love that this is recommended to me
Great video!!! Congratulations, It now I can understand how a universal joint works
Don't know how I ended here but I'm glad I did.
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.
In your channel all videos are good
Fentastic animation
Amazing animation with lovely explanation :)
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.
Thanks for the interactive animation and explanation !
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.
Thanks that was well explained. Good work.
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.
THANK YOU VERY MUCH!
i feel much better having understood this
Please explain how a constant-velocity (CV) joint works. For a front-wheel car describing how it works at the trans-axle end as well as the wheel hub end.
Thanks for this video love from India
How do hinges, pivots, and joints work in machines? Do they mimic muscles or are magnets and spring involved?
Wonderful! Thank you from Texas!
I don't know why, but I clapped after finishing this video. Hahaha. Great videos, man.
Excellent video...thanks for sharing.
This explains why a double cardan joint is used in some mechanical applications. 🔧
Please do a video on constant velocity joints!
3:14 there he talks about CV joints
I clearly understand about universal joint. Thank you
output speed is different?! mind blown, so that's why pinion angles on cars is so important!
Спасибо за видео!
для меня такой механизм не новость но, я не знал, что выходная скорость вращения переменная. Немного прозрел спасибо!
Почему выходная скорость переменная ?
Roman Ananenkov это объяснено в видео
Roman Ananenkov как бы график на 2:57 просто наглядно показывает это....а почему объяснено ... посмотри еще раз))))
Амиран Блаженный окей, спасибо)
Thank you very much.
Effort much appreciated.
Great video. Plz tell What software you used to make this video
Front wheel drive cars have constant velocity joints for changing wheel angle directions while maintaining a constant velocity output. I was hoping to see a comparison of this cross design to that of the car's design which uses ball bearings.
I have always wondered how that works... omg thank you
I understand that at 2.30 , the green spot has the same direction spin as the cross. Why at 2.42, the green spot does not has the same reverse spin? Doesn't the spot is the same shaft end?
I am trying to figure out the bearing movement on the cross. Should it has repeat forward+reverse rotation or a continuous 1 direction rotation?
Nice cross joint sir
Gracias TH-cam por tus recomendaciones en 2020
awesomely explained
outstandable!!!!!!!!Thanks Learn Engineering