Untitled Document
* Rolling bearing
  * Ball bearings
  * Roller bearings
  * Bearing life
  * Minimum loads
  * Bearing
  * Radial location
of bearings
  * Bearing with
tapered bore
  * Axial location
of bearings
  * Housing and
shaft tolerance

Bearing Arrangement

The bearing arrangement of a rotating shaft requires two bearings to locate and support the shaft radially and axially. In most applications one of the bearings locates the shaft both radially and axially. The second bearing provides purely radial support. These are known as locating and non-locating or "fixed" and "free" bearings.

Locating (fixed) bearings
The locating bearing must be capable of carrying combined loads in both directions and must also be secured to both the shaft and housing to prevent lateral movement. Suitable bearings for this purpose are deep groove ball, spherical roller, double row or paired angular contact ball or paired taper roller bearings. In some instances a purely radial bearing such as a cylindrical roller bearing without flanges can be used if paired with a thrust bearing having radial clearance in the housing.

Non-locating bearings
Non-locating bearings provide radial support only and must allow the shaft relative movement to the locating or fixed bearing to allow thermally induced dimensional changes. This can take place within the bearing itself, as in a cylindrical roller bearing, or between one of the bearing rings and its seating.
Cross-located bearings
In some applications both bearings are used to locate the shaft axially. All types of radial ball and roller bearings, which can accept axial loads in at least one direction, can be included in this category. In these instances the effect of thermal expansion within the bearings and shaft assembly must be provided for when fitting the bearings.

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