We choose when the bearings are all those factors to consider it today, and everyone one to address this issue.
1, bearing radial load

    The main radial load bearing for the radial bearings. These bearings nominal contact angle a0 <= 45 0. Foot rain than the same ball bearing roller bearing can withstand greater radial load.
N-type and NU type cylindrical roller bearings can bear radial load, other types of radial bearings can bear radial load, axial loads can be.
2, the axial load bearing

The main load bearing axial thrust bearing generally, it is the nominal contact corner a0> 450. Thrust bearing and thrust angular contact ball bearing according to different structures can withstand one or two directions of axial force. When an especially high tolerance to the optimal use of thrust cylindrical roller bearings and spherical roller thrust bearings.
    Spherical roller thrust bearings and a one-way thrust angular contact ball bearings can withstand axial load and radial load, the other thrust bearings can only bear axial load.
3, the length of bearing their own compensation

    Supporting a shaft and bearing usually a combination of fixed bearing and the bearing structure of swimming. Swimming the length of the bearing axis error compensation and thermal expansion.
    NU-type and N-type cylindrical roller bearing is ideal for swimming bearings, these bearings can be the length of their compensation. Bearing inner ring can be a tight fit.
4, with the length of the slip compensation

    Bearings can not be separated (such as deep groove ball bearings and spherical roller bearings) also can be used for swimming bearings. These bearings use two rings in a match, there is no fixed axial surface. Therefore, bearing a ring in the supporting surface activities.
5, separable bearing (precision)

    This is a ring of the bearing can be installed separately, when the two rings have the advantage of using tight fit very prominent.
Separable four-point contact ball bearings, including bearings, inner ring of the double half-double row angular contact ball bearings, cylindrical roller bearings, tapered roller bearings, thrust ball bearings, thrust cylindrical roller bearings and spherical roller thrust bearings.
    There is also an inseparable way, describes the type of bearing bar:), can not be separated bearings include: deep groove ball bearings, single row angular contact ball bearings, spherical ball bearings, roller bearings Peng-shaped and spherical roller bearings.
6, the accuracy

    In most cases, application of the general size and rotation of the bearing accuracy is sufficient. When higher, the bearings need a higher level of accuracy,
6, not neutral compensation

    Neutral does not appear in the processing of journal bearing with surface or with the surface, especially with the surface of the processing equipment is not in a completed card. Also have use when bearing misalignment, (for example: flange bearing or plummer block). As the work load so that the shaft bending deformation, resulting in the bearing inner and outer rings tilted, will also appear misalignment.
    Spherical bearings can compensate for misalignment and tilt, for example: self-aligning ball bearings, roller bearings Peng-shaped, radial and thrust spherical roller bearings. These bearings have a concave spherical outer ring raceway, rolling elements and inner ring can be rotated inside. The deflection angle of shaft center bearing compensation depends on the ability of their own type, size and load conditions.
    Spherical Bearings and thrust belt seat has a spherical ball bearing the bearing surface: concave spherical seat installed in the circle when the deflection angle can be adjusted compensation.
7, speed

    Separate special low friction bearings, so you can achieve maximum speed. These bearings have only radial deep groove ball bearings and the load can withstand the combined load of the angular contact ball bearings.
    The dimensional accuracy of bearing, rotating parts with precision and accuracy, using the lubrication cooling, the use of a special form of the bearing cage can increase the allowable speed.
    Low-noise operation
    In small motors, office equipment and household appliances such as general requirements for operation noise to's.
8, conical hole

    With a conical bore tapered bearings can be installed directly to the journal (for example: high-precision structure of the single and double row cylindrical roller bearings). When installing this type of bearing can be adjusted out of given radial clearance.
    Most of the holes with a conical self-aligning ball bearings, drum-shaped roller bearings and spherical roller bearings can be installed through a sleeve on the cylindrical journal. Such bearings are particularly easy to install and remove.
9, the stiffness

    Bearing stiffness is usually directed to some extent the elastic deformation of the bearing force required. Spindle and pinion shaft bearings are required to have a high stiffness. As the rolling elements and raceway contact conditions are different, roller bearing stiffness than ball bearing stiffness.
10, the friction

    In addition to heating and cooling is, the internal friction of the bearing operating temperature also played a significant role in the decision. Low friction bearings are: radial load of deep groove ball bearings, single row angular contact ball bearings with a cage and cylindrical roller bearings. Contact sealed bearings, full complement cylindrical roller bearings and thrust roller bearings will have a greater friction.