Editing Rolling-element bearing (section)

==== CARB toroidal roller bearings ====
CARB bearings are toroidal roller bearings and similar to [[spherical roller bearing]]s, but can accommodate both angular misalignment and also axial displacement.<ref name="SKF, CARB" >{{cite web
 |title=CARB toroidal roller bearings 
 |publisher=[[SKF]]
 |url=http://www.skf.com/group/products/bearings-units-housings/roller-bearings/carb-toroidal-roller-bearings/index.html
}}</ref> Compared to a spherical roller bearing, their radius of curvature is longer than a spherical radius would be, making them an intermediate form between spherical and cylindrical rollers. Their limitation is that, like a cylindrical roller, they do not locate axially. CARB bearings are typically used in pairs with a locating bearing, such as a [[spherical roller bearing]].<ref name="SKF, CARB" /> This non-locating bearing can be an advantage, as it can be used to allow a shaft and a housing to undergo thermal expansion independently.

Toroidal roller bearings were introduced in 1995 by [[SKF]] as "CARB bearings".<ref name=":2">{{cite web|title=The CARB bearing – a better solution for the front side of drying cylinders|url=http://www.skf.com/files/519900.pdf|publisher=SKF|access-date=2 December 2013|url-status=dead|archive-url=https://web.archive.org/web/20131203011933/http://www.skf.com/files/519900.pdf|archive-date=3 December 2013}}</ref> The inventor behind the bearing was the engineer Magnus Kellström.<ref>{{cite web|title=CARB - a revolutionary concept|url=http://www.skf.com/binary/tcm:12-109023/6102_SV.pdf|publisher=SKF|access-date=2 December 2013}}</ref>