![]() | This ![]() It is of interest to the following WikiProjects: | |||||||
|
That figure title "An example of a radial ball bearing" is misleading... the image shows a Four-Point Contact Bearing with 2-piece Inner Race, sometimes called an "X Bearing with 2-piece Inner Race." The raceways are ogives in cross section. What is commonly called a "Radial Bearing" (also often called a "Deep Groove Bearing" or a "Conrad Bearing") has a semicircular raceway in cross section. [unsigned]
Should some mention be made of thrust bearings? -- Izuko, 8/13/05
I've removed a number of commercial external links, see here, and discuss if anyone feels that some should be re-added. If there are a few really notable manufacturers, it would be okay to link to just those, but it would be far better to use internal links for them, to discourage further non-notable manufacturers from adding themselves. -- Interiot 06:25, 1 March 2006 (UTC)
Why not include some information regarding bearing numbering systems. eg 6204.2ZR.C3 6= bearing type radial ball bearing, 2=width series, 04= inside diameter 20mm (4mm x 5), suffix 2zr (metal shields), C3 = internal radial clearance larger than normal
"A bearing is a component used to reduce friction in a machine."
Come again? Really?? No. Oil reduces friction in a machine, so it's a bearing?
A bearing is a joint union between two items, one being the load & the other being the support, the point of contact being "the bearing". this can be between solid constructions "as in buildings" or between moving objects as in machines. The medium used between the moving parts to allow movement might be more accurately described as the race, sleeve or shell depending on the medium used. This medium is purely a friction reducer at the point of contact between the moving objects. The description below defines it further. —Preceding unsigned comment added by 86.146.0.153 ( talk) 08:44, 26 April 2008 (UTC)
It seems to me that a bearing is something that *constrains* motions of parts in a machine. A *good* bearing reduces friction over a worse bearing, but sleeve bearings are still bearings. Oiling a sleeve bearing reduces friction, but the oil used isn't a bearing! WolfKeeper 19:56, 14 August 2006 (UTC)
This article really could use some illustrations - there are very good ones at Commons:Category:Bearings, but I'm not knowledgeable enough to assign them. There are also good photographs used in the German version of this article. Sandstein 05:42, 18 August 2006 (UTC)
I know there are many many types of bearings, especially if you include different mountings, but a list would be educational of non-experts. (E.g" cutlass bearing, pillow block, etc...) 24.225.51.32 17:19, 10 October 2007 (UTC)
This article leaves out the nonobvious things about bearings that I'd like to see explained by a knowledgeable person:
A caged bearing is a device that uses a "low contact point or low friction" metal cage that runs in the ball or roller track with the balls or rollers to keep them apart & maintains a preset distance between them. If the balls or rollers were to come into contact with each other, their contact point would be extremely small, their contact speed would be double that of the bearing speed, the result is that the rubbing together at such speeds on such small contact areas generates intense heat and completely wrecks the bearing. The vast majority of ball & roller bearings are caged for this reason. The cage can easily be seen in a non sealed ball bearing as spacers between the balls.
A sealed bearing is a normal ball bearing that has the addition of rubber or plastic seals each side of the bearing to prevent ingress of dust particles etc. and to keep its pre-filled lubricant within. The seal is fixed to the outer race and has a lubricated low friction lip running on the inner race. These bearings are used mainly in places where regular lubrication is impractical ie, small domestic & portable equipment (drills washing machines & the like). —Preceding unsigned comment added by 86.146.0.153 ( talk) 09:05, 26 April 2008 (UTC) - Mark Foskey 20:17, 13 November 2007 (UTC)
I don't have time to follow up right now, but the blanket reversion of my recent edits won't stand vis-a-vis the edit summary given with it. Tweaking is welcome, but blanket reversion won't do here. Too many omissions were validly addressed by the additions. Will be back soon to revisit. — ¾-10 03:07, 14 April 2009 (UTC)
A footnote in the Types chart says "Stiffness is the amount that the gap varies when the load on the bearing changes." Wouldn't it make more literal sense to say that stiffness is the amount that the gap doesn't vary, or the magnitude of the gap's resistance to variation, or something like that? — Deadcode ( talk) 07:22, 3 March 2010 (UTC)
As it is obvious that rollers and wheels are related technologies a statement to this effect now introduces the history section.
There is no evidence that the ancient egyptains used rollers or that they invented them. The former is entirely archeological speculation, the later certainly not true (see invention of the wheel). Actual egyptian art depicts sleds on lubricated runners without rollers. The references for the current statement do not link to a viewable document, one links to an engineering association, the other to a website selling copies of their proceedings.
I suggest that Egyptain use of rollers is more accurately described as speculation hence my previous text alteration as follows:
"Though it is often claimed that the Egyptians used roller bearings in the form of tree trunks under sleds[2] they are depicted in their own drawings as moving massive stone blocks on sledges with the runners lubricated with a liquid which would constitute a plain bearing. This may have been because there were few trees in Egypt adequate for this task and that under the weight of the larger stones any logs small enough to be man-handled into position to form a continuous rolling surface would have quickly deteriorated."
Evidence, in the form of a real ancient illustration (not a modern "theory") can be found by Googling Djehutihotep. The illustration shows a massive statue on a sled but without rollers. — Preceding unsigned comment added by Cymtriks ( talk • contribs) 12:28, 15 April 2011 (UTC)
Please comment. — Preceding unsigned comment added by Cymtriks ( talk • contribs) 12:00, 15 April 2011 (UTC)
The use of rollers in ancient Egypt is speculation, all the citation is doing is referencing a source that itself is speculation and not verifiable. The source material in the form of actual ancient pictures clearly shows sleds without rollers but with lubricant being applied to the runners. I am puzzled as to why this is deemed original research, if anything claims that rollers were used is original as it ignores the source material. I'll dig out some references to documents based on history and try to verify the copyright status of the tomb wall paintings. Hopefully that will bring any changes in line with the rules.
Comments welcome! — Preceding unsigned comment added by Cymtriks ( talk • contribs) 21:43, 15 April 2011 (UTC)
There should be some mentioning of 'ball retainers'. These are some kind of torus or ring shaped structure which can hold the balls in place. See:
http://www.p-wholesale.com/upimg/19/730a1/ball-retainer-288.jpg
I think that the only serve the purpose of keeping the balls in place when placing it there, and in theory, if you could remove the retainer itself after assembling whatever, that would make no difference.
They are often used in bicycle hubs. I have not seen them elsewhere.
80.162.194.33 ( talk) 09:18, 3 August 2011 (UTC)
Friction roller search. New article section or new friction rollers wiki page? HonestIntelligence ( talk) 09:24, 6 June 2012 (UTC)
Much of the article seems to relate to modern bearings. What bearing would a simple cart, or a 17th Century carriage, or an American wagon (as in a wagon train) have used? Ball bearings would seem to be too advanced a technology for these. Would they usea plain bearing with the wooden contact points lubricated with grease? Quentin Durward ( talk) 11:39, 7 August 2016 (UTC)
Hello fellow Wikipedians,
I have just modified 2 external links on Bearing (mechanical). Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{
Sourcecheck}}
).
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
RfC before doing mass systematic removals. This message is updated dynamically through the template {{
source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 10:16, 29 October 2016 (UTC)
Hello fellow Wikipedians,
I have just modified 3 external links on Bearing (mechanical). Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
RfC before doing mass systematic removals. This message is updated dynamically through the template {{
source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 17:09, 16 July 2017 (UTC)
Imagine that you had an eigth-grade textbook on bearings and in the middle of it you inserted a paragraph out of a someone's PhD dissertation about bearings. That's the situation with the "Rolling-element bearing outer race fault detection" section. It's not that it's wrong, but that it's just at a completely different level than the rest of the article. That same amount of space could be much better used to cover a more general topic about bearings. Someone who is an expert in this material should remove that section and add some more general material. — Preceding unsigned comment added by 96.37.224.164 ( talk) 07:00, 18 September 2017 (UTC)
The following Wikimedia Commons files used on this page or its Wikidata item have been nominated for deletion:
Participate in the deletion discussion at the nomination page. — Community Tech bot ( talk) 08:38, 22 July 2020 (UTC)
This article was the subject of an educational assignment supported by
Wikipedia Ambassadors through the
India Education Program.
The above message was substituted from {{IEP assignment}}
by
PrimeBOT (
talk) on
19:59, 1 February 2023 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | |||||||
|
That figure title "An example of a radial ball bearing" is misleading... the image shows a Four-Point Contact Bearing with 2-piece Inner Race, sometimes called an "X Bearing with 2-piece Inner Race." The raceways are ogives in cross section. What is commonly called a "Radial Bearing" (also often called a "Deep Groove Bearing" or a "Conrad Bearing") has a semicircular raceway in cross section. [unsigned]
Should some mention be made of thrust bearings? -- Izuko, 8/13/05
I've removed a number of commercial external links, see here, and discuss if anyone feels that some should be re-added. If there are a few really notable manufacturers, it would be okay to link to just those, but it would be far better to use internal links for them, to discourage further non-notable manufacturers from adding themselves. -- Interiot 06:25, 1 March 2006 (UTC)
Why not include some information regarding bearing numbering systems. eg 6204.2ZR.C3 6= bearing type radial ball bearing, 2=width series, 04= inside diameter 20mm (4mm x 5), suffix 2zr (metal shields), C3 = internal radial clearance larger than normal
"A bearing is a component used to reduce friction in a machine."
Come again? Really?? No. Oil reduces friction in a machine, so it's a bearing?
A bearing is a joint union between two items, one being the load & the other being the support, the point of contact being "the bearing". this can be between solid constructions "as in buildings" or between moving objects as in machines. The medium used between the moving parts to allow movement might be more accurately described as the race, sleeve or shell depending on the medium used. This medium is purely a friction reducer at the point of contact between the moving objects. The description below defines it further. —Preceding unsigned comment added by 86.146.0.153 ( talk) 08:44, 26 April 2008 (UTC)
It seems to me that a bearing is something that *constrains* motions of parts in a machine. A *good* bearing reduces friction over a worse bearing, but sleeve bearings are still bearings. Oiling a sleeve bearing reduces friction, but the oil used isn't a bearing! WolfKeeper 19:56, 14 August 2006 (UTC)
This article really could use some illustrations - there are very good ones at Commons:Category:Bearings, but I'm not knowledgeable enough to assign them. There are also good photographs used in the German version of this article. Sandstein 05:42, 18 August 2006 (UTC)
I know there are many many types of bearings, especially if you include different mountings, but a list would be educational of non-experts. (E.g" cutlass bearing, pillow block, etc...) 24.225.51.32 17:19, 10 October 2007 (UTC)
This article leaves out the nonobvious things about bearings that I'd like to see explained by a knowledgeable person:
A caged bearing is a device that uses a "low contact point or low friction" metal cage that runs in the ball or roller track with the balls or rollers to keep them apart & maintains a preset distance between them. If the balls or rollers were to come into contact with each other, their contact point would be extremely small, their contact speed would be double that of the bearing speed, the result is that the rubbing together at such speeds on such small contact areas generates intense heat and completely wrecks the bearing. The vast majority of ball & roller bearings are caged for this reason. The cage can easily be seen in a non sealed ball bearing as spacers between the balls.
A sealed bearing is a normal ball bearing that has the addition of rubber or plastic seals each side of the bearing to prevent ingress of dust particles etc. and to keep its pre-filled lubricant within. The seal is fixed to the outer race and has a lubricated low friction lip running on the inner race. These bearings are used mainly in places where regular lubrication is impractical ie, small domestic & portable equipment (drills washing machines & the like). —Preceding unsigned comment added by 86.146.0.153 ( talk) 09:05, 26 April 2008 (UTC) - Mark Foskey 20:17, 13 November 2007 (UTC)
I don't have time to follow up right now, but the blanket reversion of my recent edits won't stand vis-a-vis the edit summary given with it. Tweaking is welcome, but blanket reversion won't do here. Too many omissions were validly addressed by the additions. Will be back soon to revisit. — ¾-10 03:07, 14 April 2009 (UTC)
A footnote in the Types chart says "Stiffness is the amount that the gap varies when the load on the bearing changes." Wouldn't it make more literal sense to say that stiffness is the amount that the gap doesn't vary, or the magnitude of the gap's resistance to variation, or something like that? — Deadcode ( talk) 07:22, 3 March 2010 (UTC)
As it is obvious that rollers and wheels are related technologies a statement to this effect now introduces the history section.
There is no evidence that the ancient egyptains used rollers or that they invented them. The former is entirely archeological speculation, the later certainly not true (see invention of the wheel). Actual egyptian art depicts sleds on lubricated runners without rollers. The references for the current statement do not link to a viewable document, one links to an engineering association, the other to a website selling copies of their proceedings.
I suggest that Egyptain use of rollers is more accurately described as speculation hence my previous text alteration as follows:
"Though it is often claimed that the Egyptians used roller bearings in the form of tree trunks under sleds[2] they are depicted in their own drawings as moving massive stone blocks on sledges with the runners lubricated with a liquid which would constitute a plain bearing. This may have been because there were few trees in Egypt adequate for this task and that under the weight of the larger stones any logs small enough to be man-handled into position to form a continuous rolling surface would have quickly deteriorated."
Evidence, in the form of a real ancient illustration (not a modern "theory") can be found by Googling Djehutihotep. The illustration shows a massive statue on a sled but without rollers. — Preceding unsigned comment added by Cymtriks ( talk • contribs) 12:28, 15 April 2011 (UTC)
Please comment. — Preceding unsigned comment added by Cymtriks ( talk • contribs) 12:00, 15 April 2011 (UTC)
The use of rollers in ancient Egypt is speculation, all the citation is doing is referencing a source that itself is speculation and not verifiable. The source material in the form of actual ancient pictures clearly shows sleds without rollers but with lubricant being applied to the runners. I am puzzled as to why this is deemed original research, if anything claims that rollers were used is original as it ignores the source material. I'll dig out some references to documents based on history and try to verify the copyright status of the tomb wall paintings. Hopefully that will bring any changes in line with the rules.
Comments welcome! — Preceding unsigned comment added by Cymtriks ( talk • contribs) 21:43, 15 April 2011 (UTC)
There should be some mentioning of 'ball retainers'. These are some kind of torus or ring shaped structure which can hold the balls in place. See:
http://www.p-wholesale.com/upimg/19/730a1/ball-retainer-288.jpg
I think that the only serve the purpose of keeping the balls in place when placing it there, and in theory, if you could remove the retainer itself after assembling whatever, that would make no difference.
They are often used in bicycle hubs. I have not seen them elsewhere.
80.162.194.33 ( talk) 09:18, 3 August 2011 (UTC)
Friction roller search. New article section or new friction rollers wiki page? HonestIntelligence ( talk) 09:24, 6 June 2012 (UTC)
Much of the article seems to relate to modern bearings. What bearing would a simple cart, or a 17th Century carriage, or an American wagon (as in a wagon train) have used? Ball bearings would seem to be too advanced a technology for these. Would they usea plain bearing with the wooden contact points lubricated with grease? Quentin Durward ( talk) 11:39, 7 August 2016 (UTC)
Hello fellow Wikipedians,
I have just modified 2 external links on Bearing (mechanical). Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{
Sourcecheck}}
).
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
RfC before doing mass systematic removals. This message is updated dynamically through the template {{
source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 10:16, 29 October 2016 (UTC)
Hello fellow Wikipedians,
I have just modified 3 external links on Bearing (mechanical). Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
RfC before doing mass systematic removals. This message is updated dynamically through the template {{
source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 17:09, 16 July 2017 (UTC)
Imagine that you had an eigth-grade textbook on bearings and in the middle of it you inserted a paragraph out of a someone's PhD dissertation about bearings. That's the situation with the "Rolling-element bearing outer race fault detection" section. It's not that it's wrong, but that it's just at a completely different level than the rest of the article. That same amount of space could be much better used to cover a more general topic about bearings. Someone who is an expert in this material should remove that section and add some more general material. — Preceding unsigned comment added by 96.37.224.164 ( talk) 07:00, 18 September 2017 (UTC)
The following Wikimedia Commons files used on this page or its Wikidata item have been nominated for deletion:
Participate in the deletion discussion at the nomination page. — Community Tech bot ( talk) 08:38, 22 July 2020 (UTC)
This article was the subject of an educational assignment supported by
Wikipedia Ambassadors through the
India Education Program.
The above message was substituted from {{IEP assignment}}
by
PrimeBOT (
talk) on
19:59, 1 February 2023 (UTC)