BOLTR: Sprag Clutch | Engineered Bearings
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- čas přidán 26. 01. 2019
- We look inside a one way bearing to see how it works. In this case, it's a sprag clutch type. Thanks for your help making VJOs. I appreciate your help. Early access here / ave
- Věda a technologie
A simple device that stops you from going the wrong direction. Should be standard on vehicles and dating apps.
and toilet roll holders
Funny you mention vehicles: It's pretty common in an automagic transmission to have a one way clutch (sprags or rollers typically) to allow planetary gear sets and/or clutch packs to keep everything going in the right direction.
Of course, sadly, engineers have yet to figure out a way to have this do anything to take into account the problem between the driver's seat and the steering wheel.
@@astrangeparrot Damn, you beat me to it. Been years since I have had an auto tranny a part.
@@TheLittlered1961 That is why they're call "gearbox" in Urban Dictionary...
Bruh
Wish I had some of those when I was younger. Woulda been fun to replace my buddies' skateboard bearings
Thank you for the idea. I've got skater friends.
I learn more, more quickly from watching your vids like this than I would on a college course.
Love your content, my dude.
A lot of transmissions use sprag bearing especially on 2nd gear drum clutch pack! The keyed inner race gives it away! Great video!
Thats cool. There's a bicycle hub manufacturer here in the states called Onyx that uses a sprag clutch assembly. Apparently a Duke university study in 2016 determined that the Onyx hub had the lowest rolling resistance in any commercially available bike hub at the time. They're pert spendy though, as one might imagine. Great VJO as always!
I have an Onyx rear hub and I can attest, they are absolutely badass. If you understand how a pawl based hub works, you realize all your pedaling force is transferred through such tiny pawls on such tiny teeth, especially in something like an industry 9 hub. On an Onyx, the whole sprag engages with your pedaling force on the drive shaft (best way I can describe it) so all your force is spread evenly through the hub.
Yes they are spendy, buy onyx hubs are actually game changing. I want them on my road and gravel wheels as well.
In all my years I've never seen a bearing like that... Cunningly simple, as most of the best ideas are.
Thanks for sharing.
In all the years you've been entertaining me, I've learnt something I didn't know already. I salute you.
Great breakdown on the Sprag bearing. They are vital in helicopter operations where they are called the Sprag Clutch or Free Wheeling unit/assembly. This is critical to helicopters as they allow the free wheeling of the rotor systems in case of engine failure and allow you to perform a autorotation. It is also used during practice autorotations when the engine is throttled back so that the rotor system disengages with the engine allowing the “free Wheeling’ of the rotors and a controlled (hopefully) decent and landing. Thanks for the video sir.
Ave has one of the best informational and educational channels on CZcams. For anyone who likes to tinker with things and take things apart to see how they work this is the perfect channel to watch.
Interesting fact; the one-way bearing shown in the picture, can fail to engage the lock, if it spins fast enough in in the unlocked direction, and very suddenly changes direction, then the wedge-balls will ride on an oil film, preventing them from engaging, so it's very important to not rely on these type of bearing for safety..
You see this often on smaller engines using oneway bearings instead of ratchet type pull start systems.
Traxxas nitro cars use one way bearings for starting
@@merlinious01 Exactly! :) but in fact, they are also used in the electric starters for most real cars, in case the pinion fails to disengage from the flywheel/flexplate when starting.
interesting
This is the only channel I've ever even considered becoming a Patron for. Thanks for whatcha do AvE
Yeah i wish i had some extra.
Cheap fucker
The deadpan delivery of your subtle and slightly inappropriate (perfect) humor is excellent 😁
Love when you share little ingenious things like this. Industrial oddities are so interesting!
We had a needle roller bearing application at work. A ramp on the bearing cage did the one way binding. Useful feature in a tiny package. Thanks for the video.
Interesting, as always, another clever piece of engineering that is taken for granted. I never realised each time I use my keyless chuck that this is what's inside. Thanks for showing me.
Every days a school day. I’ve always wondered how they worked but never made the time to learn. Thanks! You’ve educated me.
I’m fairly sure there must be one inside a new Fly Fishing reel as it runs smooth and silent in wind in, but a friction clutch engages in reverse. It’s not the usual ratchet and pawl mechanism. I’ll be thinking of you next I’m winding in a trout. If that’s not the weirdest compliment, I don’t know what is!
We don't need to know what you're thinking about when you're winding your rod... :-P
I never knew these bearings existed. I learn something new in every one of your videos. Without fail.
One of the most interesting trips I did was to SKF. They have this little exhibition in the foyer showing where their bearings are. Any kind of machinery that rotates, anywhere on the planet and off it, probably has an SKF bearing in it. There are a few other big bearing manufacturers too. SKF is a fascinating company.
Torquflite 727 learned me about sprags, they are pretty groovy things
Never realized you were such a One Direction fan *giggles*
I can't tell you how helpful this was.... This is something I always wish I learned in school!!!
Thanks for sharing AvE! Didn't know about this flavor of bearing but now I see them everywhere. Or at least my machinist buddy sees them everywhere and he told me about it when I asked him
Always wondered how these things worked, but never had the chance to pull one apart myself. This is quite a neat little design.
As always...thanks for having me in the shop.
I found out about these for the first time when is was attempting to rebuild a spinning reel. They were basically the lynchpin of the whole setup. 200$ reel fixed by a 3 dollar bearing. Ordered from Canada btw!! Awesome video as always!
I never knew there were one way bearings. I learned something new. Thank you for the fun and interesting content. I hope you are feeling ok.
I didn't know these existed until your video. It's just solved a problem with a worm driven mechanism I'm designing which also needs to freewheel in one direction.
Long-time subscriber and lover of your channel here. Was browsing in a used tool shop this morning and picked-up a NOS formsprag clutch and even more interesting...a formsprag clutch dealer’s sample. A neat little brass version with a plexiglass window showing the inner mechanism. Happy to send it your way if you’d be interested in making new content on this.
I had no clue they made bearings like that till now. Thank you.
0:11 "It's Huan Wai." Your Chinesium jokes are getting rather complex.
Almost went right by.....I snagged her though.
I thought it meant juan guey
Every time I watch one of your videos, I never fail to learn something
I dissected one at work on an armor zone tape pull system. It was the ball style. Pretty cool engineering to prevent backlash that would definitely cause tension loss. The machined wedge insert makes for a nice stought bearing that holds up well.
Good description. The part about the drill was very interesting.
My Thesis, Final year project, was a wheelchair design that raised the seat so the occupant can speak to someone on a face to face level or maybe reach into an upper cabinet.
I used a Sprag clutch on both sides of the chair actuators in my design but it was two-way. Only the power shaft (up or down) could drive the final mover.
The clutch was mainly used on escalators. A small one was VERY expensive but needed as a safety device.
I was the Top Dog of the year with that project.
Thank you for all the great content uncle AvE!
This knowledge is more useful then most of the classes I took in school
Holy shit, _that's_ how drill clutches work.
Thank you, AvE!
Sprag clutches/bearings have been the bane of my existence one was in the starter for my dad's triumph sprint it would always fail when we wanted to ride
Love this stuff man. Learned on the fly about these the other day trying to unfix a fancy fishing reel. A little different though. The rolling element was the part that was preloaded and would actually catch on a fixed cam ring that served as the "outer race" and catch the "inner race" stopping the whole rotor.
I love your channel and all your content. I can't tell you how invaluable all your vids have been to me. It had recently occurred to me that I almost never leave a comment. Always a thumbs up though but I plan to be a little more active in the doobly-do. Thanks for everything you do. ✌Keith from Long Island New York !
The overdrive, on my 64 Volvo P1800, had one. With an electric over hydraulic, planetary gear set too. Cutest little thing ever.
Just got learnt about these in class, neat timing!
I learn so much neat stuff from this channel. Its pretty damn great.
The oddest place I found a one way bearing was a paper towel dispenser.
hahahaha
Excellent description mate.
There's a sprag on my motorcycle's clutch. I wondered how it works. Thanks!
Ive seen those when i was a kid. I took the bearing apart to see why it worked in that manner. Very interesting.
I've been curious about this for a while
Very well explained and illustrated. Thank you.
The graphic for the explaination of the second type is much appreciated, I wouldn't underwise have gotten it from just the wording because I'm more the visual type.
I worked at a limestone quarry and MSHA came in for a inspection and made us put “Backstop Bearings” on every rock conveyor we had, they were very expensive and a pain in the ass to install too.
Thanks for the video, I always wondered what it looked like inside because True Precision is a company that makes one of the best hubs for bmx wheels. They use these bearings with a cog attached to it, and it
provides instant engagement and less drag than the common cassette type hub for competition racing.
Balls and wedgies - it's like being 12 all over again
Funny, I cut one of these in half just an hour ago since I was curious how it works. Simpler than I thought. It was a bike sprocket thing.
“Freehub”
@@cameronrobertson9518 Patreons get early access
*spoiler alert!*
Nice video.. the old Arpeco printing presses I work on here in the UK have the sprag bearings , they do fail more often than 'normal' bearings but are still fascinating... I've never had time to take one apart ...so thanks for the video.... The Arpeco's were Canadian machines originally.
Good explanation on that type of bearing. Now lets see one of those fancy roller ratchets. We use light weight 1/4 inch roller ratchets to tighten hi-lite fasteners on aircraft.
I've encountered these in my fly fishing reels. When retrieving the line it spins freely and when pulling more line out (or on some rare occasions when you actually manage to hook a fish) it locks and the spool spins against the disc brake system. Pretty nice compared to some cheap reels where the brake applies to both directions. Also, if you want to switch the reel from right to left hand retrieve, you just flip the bearing. Thanks for showing how they actually work!
Awsome upload!!! Love your work!!!
Keep up the good work man. Huge fan for real. As a fellow man in the trades (an elecchicken), i truly love the humor, knowledge, and everything in between.
Me, too. I'm a huge fan for fake.
@@johnpossum556 good day my friend. How bout we don't pollute a good man's page with nonsense. Appreciation is appreciation regardless of your opinion, let me word it, or show how i want to, and you do the same. Tomatoes, tomatos.
@@brandonrabe5710 You're so right. We wouldn't want any humor on this channel. If you really were a true fan you'd already know this enough not to try to put me in my place. Later...
Thanks AVE. I understood the basic function but now I know it in detail. Thanks Bud I appreciate you. P.S. and the Deuxclaw.
Good interesting VJO
Well you learn something new every day
Ave....Have never seen this before well done!
Thanks for the video, i have a recumbent tricycle from 1985 and i had no idea how the drive works like magic but i looked at the bearing of the drive wheel and its a clutch bearing like this but its more like an inch wide.
I've seen one of these on the ribbon-feed pulley on a dot-matrix printer. The pulley was coupled to the print carriage, which could move in both reverse and forward directions, but the ribbon feed was one-way. Damned clever.
Many (too many) moons ago I was an engineer with Canon. Print engines have a lot of one way clutches. The mechanism of choice was a spring which wrapped tightly around a shaft in one direction but was opened up, and hence free wheeled in the other direction. This was often used in such a way that an integral gear caused another shaft to turn when the shaft in question turned one way, but to allow the first shaft to turn independently the other way.
There's often a latch so that the first shaft might have to do a complete rotation before the clutch is re-engaged in the other direction.
When your printer picks up a blank sheet and it feeds in and out a short distance a couple of times to find the top or bottom edge, this arrangement is what stops another sheet being picked up at the same time.
We had one way bearings on our edger feed rolls, for anti kick back.
Always learn something from these videos. Thanks AVE ;-)
Thanks uncle BF learned something i didn't know i needed. Info stored for later.
Neat that it fits the the space of a typical bearing. Did not know it existed. Doesn't seem very elegant through.
I love sprag clutches, I have an automatic Husqvarna dirtbike that has a bunch in it. Cool little items for sure.
Thank you for this !!! I've seen and replaced these before, and just never bothered to take one apart. *DUH!*
These kinds of bearings are found on the front-end ball returns in some bowling centers. I was a mechanic on bowling machines for 45 years. They worked flawlessly for years, then would suddenly fail (no longer engaging).
I once worked for a guy who thought he would make them last longer by packing them with grease. The balls would no longer shift, and the clutches would no longer engage. I had to replace all 24 of them (48 lane center) one night because they all shut down, and the league could not bowl.
I like how you splashed out with a diagram. Top effort.
That was enlightening. Thank you sir 👍
Uploading like a Beast.
I have always wondered about that. Thank you sir.
I found those also in the pulley of the alternator drive. It is in constant bind when engine is spining. When stoped it allowes the alternator to spindown for shortwhile. Or for sudden deceleration of the engine it maintains the speed of alternator.
Great little info-vgo.
Great stuff as usual
A bearing for going black?
First time I encountered one of these as a young hospital maintenance worker was when I got "assigned" to go to the home of one of our staff doctors to fix his wife's exercise bike. You could pedal the thing (the bike, not the wife), but every few turns the thing would slip, causing you to do a little quick-foot routine. Bearing was inside a pulley and allowed you to pedal forward, but would freewheel when you stopped.
I like the tip and just for minute, hell I like the long vajyos. Hell I like anyway you put out. Never had the chance to lay my highballs on a pair such as shown pretty cool.
I owned a 1948 landrover gearbox which had a roller sprag for four wheel drive (only going forward) The centre ramp was a three sided star cam thing and each one had a daddy’s, a mummy and a baby roller. So nine rollers in the clutch. It used to jump like jackhammer :D
Washing machines have these! I had replace mine when I fixed my washer/dryer.
The mountain bike industry is starting to implement systems like these into their freehub bearings for silent performance. I've always been curious as to the point where it might slip or wear prematurely compared to traditional freehubs. I'd love to see you compare and disassemble some freehubs such as the i9 torch and perhaps the new Shimano XT silent freehubs.
you should reverse the old video cull. how are people supposed to know what not to do if they can't see you do it?
I agree with you
I agree with you
@@Caltevir deleted?
@@Caltevir I went to your link and the page has been deleted
Sprags are used in the AH-64 Apache to prevent back driving of the drivetrain. They're a sight more sophisticated than this, but same idea. Great vid, uncle BF.
You will find these one way sprags throughout all kinds of automatic transmissions today. Both types are used.
They were always popular in the starter bendix drive as well.
Always wondered. Thanks!
Huh. I never knew that such a thing existed... Learned something here, and that's always cool.
Yep Sprag clutches are every place you look in machinery. Simply wonderful simple devices.
Best channel ever!
hmmm had no idea! Good show!
Another good 'un, Uncle BF. Thanks!
Another video and another thing I have learnt
Learned something new today cool vid...
There are also needle roller oneway units. These oneway bearings are found in R/C helicopters where they're used to allow the heli to autorotate if the motor/engine fails.
Thank you so much for teaching me
such a great channel.
Pretty cool idea. Shimano reels use a similar technique but they use roller bearings in a cage with springs for tension in the races. What is "really" cool is they made it switchable. You can turn off the anti-reverse.