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
Ball Bearings

Single row deep groove ball bearings
This bearing type forms the largest group because of its ability to carry both axial and radial loads, the very low friction and low noise and the low maintenance required. It is suitable for high speed and light loads. Many of these bearings are sealed or shielded for life. Most are designated and dimensioned to the ISO standards.


Self-aligning ball bearings
This bearing has a double row of balls. Its outer ring raceway is spherical allowing the rings to be dynamically misaligned, making it suitable for use in applications where the misalignment of bearings on a common shaft can occur. It can carry radial and axial loads but is not suitable for heavy or arduous operation. The number of balls and the contact area each ball makes with the raceways restrict the capacity or load rating of the bearing. Since this contact area is so small, contact stresses can be as high as 4,000 MPa, which equates to 400 kg/mm or approximately 90 tones on an area the size of a thumbnail. This capacity to carry such enormous loads makes the bearing the most highly stressed component in the equipment.



Single row angular contact ball bearings
This bearing is capable of carrying high combined radial and axial loads in one direction only. It must be used in conjunction with a similar bearing acting in the opposite direction. This pairing of the bearings is done in a back-to-back, load lines diverging towards the bearing axis, or face-to-face configuration, load lines converging towards the bearing axis, It is extremely important that these bearings are mounted together in the correct orientation and with the correct degree of pre-load or clearance.


Y-bearing units
The Y-bearing unit is a complete unit consisting of a bearing mounted in a bearing housing. The bearings are based on the deep groove ball bearing but have an extended inner ring and a spherical outer ring diameter, which allows for static misalignment of the bearings. The bearings can be fitted in various types of housing; cast iron being the most common but pressed steel and plastic housings is also used.

The Y-bearing units are very robust and simple to use but do not allow for axial displacement that may take place due to thermally induced dimensional changes. For this reason the bearing centres should be short or the housing supported on a resilient material or structure, such as sheet metal.

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