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Overload: Difference between revisions
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[[Overload]] (Also known as Overload Deformation, Brinelling, and True Brinelling) is where a bearing's [[Raceway|raceways]] get permanent indentations at the ball pitch as a result of exceeding the static load limit of the raceway material. The indentations match the ball shape and are usually surrounded by a build-up formed by displaced material. | [[Overload]] (Also known as Overload Deformation, Brinelling, and True Brinelling) is where a bearing's [[Raceway|raceways]] get permanent indentations at the ball pitch as a result of exceeding the static load limit of the raceway material. The indentations match the ball shape and are usually surrounded by a build-up formed by displaced material. | ||
Freestyle skateboarding, by its very nature, does not limit itself to just rolling, so when we do [[:Category:Rail Tricks|Rail Tricks]], we are applying [[Axial|axial]] forces as well. The static overloading and shock loads from [[:Category:Rail Tricks|rail tricks]] tend to cause overload deformation because it can easily exceed the [[Axial|axial]] load limit of bearings that were really only designed to withstand [[Radial|radial]] forces. Bearings with deep races | Freestyle skateboarding, by its very nature, does not limit itself to just rolling, so when we do [[:Category:Rail Tricks|Rail Tricks]], we are applying [[Axial|axial]] forces as well. The static overloading and shock loads from [[:Category:Rail Tricks|rail tricks]] tend to cause overload deformation because it can easily exceed the [[Axial|axial]] load limit of bearings that were really only designed to withstand [[Radial|radial]] forces. Bearings with deep races, however, can be much more durable in this respect. | ||
<div><ul> | <div><ul> | ||
<li style="display: inline-block;"> [[File:Overload Indentations on Inner Raceway of Mini-Logo Bearing 1.jpg|thumb|none|Overload indentations on the inner raceway of a Mini-Logo bearing. freestylekb.com ]]</li> | <li style="display: inline-block;"> [[File:Overload Indentations on Inner Raceway of Mini-Logo Bearing 1.jpg|thumb|none|Overload indentations on the inner raceway of a Mini-Logo bearing from many hours worth of rail tricks. freestylekb.com ]]</li> | ||
<li style="display: inline-block;"> [[File:Overload Indentations on Inner Raceway of Mini-Logo Bearing 2.jpg|thumb|none| | <li style="display: inline-block;"> [[File:Overload Indentations on Inner Raceway of Mini-Logo Bearing 2.jpg|thumb|none|More overload indentations on the inner raceway of a Mini-Logo bearing from many hours worth of rail tricks. freestylekb.com ]]</li> | ||
</ul></div> | </ul></div> | ||
The [[ISO]] classification for this failure mode can be found in [http://www.iso.org/iso/catalogue_detail.htm?csnumber=27042 ISO 15243:2004 (Rolling bearings -- Damage and failures -- Terms, characteristics and causes)], 5.5 Plastic deformation -> 5.5.2 Overload deformation. | The [[ISO]] classification for this failure mode can be found in [http://www.iso.org/iso/catalogue_detail.htm?csnumber=27042 ISO 15243:2004 (Rolling bearings -- Damage and failures -- Terms, characteristics and causes)], 5.5 Plastic deformation -> 5.5.2 Overload deformation. | ||
[[File:Overload Indentations on Raceway at Ball Pitch - SKF.jpg|thumb|none|Another example of indentations on the raceway at ball pitch. skf.com ]] | |||
[[Category:Glossary]] | [[Category:Glossary]] | ||