Overload: Difference between revisions
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[[File:Overload Indentations on Raceway at Ball Pitch - SKF.jpg|thumb|none|Indentations on the raceway at ball pitch. skf.com ]] | [[File:Overload Indentations on Raceway at Ball Pitch - SKF.jpg|thumb|none|Indentations on the raceway at ball pitch. skf.com ]] | ||
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. | 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 and steel cages are much more durable in this respect. | ||
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<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. freestylekb.com ]]</li> | ||
Revision as of 01:38, 26 November 2016
Overload (Also known as Overload Deformation, Brinelling, and True Brinelling) is where a bearing's 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 Rail Tricks, we are applying axial forces as well. The static overloading and shock loads from rail tricks tend to cause overload deformation because it can easily exceed the axial load limit of bearings that were really only designed to withstand radial forces. Bearings with deep races and steel cages are much more durable in this respect.
The ISO classification for this failure mode can be found in ISO 15243:2004 (Rolling bearings -- Damage and failures -- Terms, characteristics and causes), 5.5 Plastic deformation -> 5.5.2 Overload deformation.