Supported by an axis of rotation at least a certain interval of two intermediate bearings. Bearing in the form of fixed according to the actual conditions of use - swimming bearing, self-adjustable bearing support or both ends of the swim.
Fixed - DU bushing swimming ring
As the manufacturing error, the two radial bearings supporting the shaft center distance and bearing of the center distance is usually not completely equal,Mould guide plate working temperature range also make this change, hence the need for bearings to compensate for this error swimming .
N-type and NU type cylindrical roller bearings are ideal for swimming bearings, roller bearings, and type of cage in the bearing raceway ring without ribs move.
Other types of bearing rings is only in a loose fit when I could swim as bearings, such as deep groove ball bearings and spherical roller bearings.plasic bushing Therefore, under the point load bearing rings usually loose fit, where mostly outer ring.
In contrast,plain bearing fixed-side bearing from the fixed axial shaft position and to withstand external axial force. For more than two bearings with the axis of rotation, just as a fixed end bearing to avoid damaging the bearing pre-load.
What type of bearings used as a fixed-side bearing axial load depends on the size and level of axial positioning accuracy.
For example, using a double row angular contact ball bearings than using a deep groove ball bearing or a spherical roller bearings can live closer bearing position. Symmetrical arrangement of a pair of angular contact ball bearings or tapered roller bearings for the fixed bearing, cast bronze the axial positioning better.
General advantages of angular contact ball bearings bearings do not need to be more prominent of these washers can be added to adjust any combination of O-type layout (back to back, or a relatively narrow inner ring) or X-type arrangement (face to face or the inner ring is relatively broad-brimmed),bronze bushing so When the general structure with angular contact ball bearings to form O-or X-axial arrangement, when you can get a small game (UA type), zero-clearance (UO-type) or small pre-load (UL type).
General structure of the spindle bearing type (UL type) installed as O-or X-type arrangement may also be light pre-load.
Tapered roller bearings used as a fixed bearing (N11-type structure), the installation is also very convenient. They follow the appropriate match of the axial clearance supply,dry bushing use not require any setup and adjustment.
In the gearbox,sleeve bushing in order to play the role of a fixed bearing, sometimes a four-point contact ball bearings installed directly into a cylindrical roller bearings next to the surface. bushing The outer ring does not support four-point contact ball bearings can only bear axial force, radial force by the cylindrical roller bearings to bear.
When the axial load is small, NUP type cylindrical roller bearings can also be used as a fixed bearing.
Adjustable at both ends of the fixed bearing
Adjustable at both ends of the fixed support generally consists of two symmetrical arrangement of angular contact ball bearings or tapered roller bearing. Bearing axial adjustment when installing a ring, until you get the appropriate clearance or the need to pre-load. Particularly useful for this type of bearing axially demanding situations, such as the cone with a spiral toothed gear shaft bearings and spindle bearings. In principle, these bearings can choose either type O, you can also configure the X selection.