Ball bearings normally consist of bearing rings, roller elements and a cage. The rolling elements are arranged between the inner and outer rings with a cage. This keeps the roller elements in the correct relationship and position to each other, so that they do not touch each other. In this way, a smooth rolling movement is achieved during operation.
A bearing consists of an inner and outer ring. The inner ring is also called the tread. In the case of ball bearings, there is also a groove in the ring. The inner ring is normally in contact with a shaft, the outer ring with a housing.
The rolling elements are bullets. There are many types of bearings with different shapes of track roller, such as trapezoidal shape or barrel shape.
The cage guides the rolling elements along the bearing rings, at the same time ensuring that they remain in the correct relative position. There are several types of cages including pressed, machined and cast cages.
Deep Groove Ball Bearings
Deep groove ball bearings are suitable for radial loads, but can also be loaded axially to a limited extent. The deep groove ball bearing is available in different variants. The 1-row variants are suitable for a shaft diameter of 10mm - 200mm and are available as open bearings, and with a metal or rubber seal. The sealed variants are easy to apply and lubrication is not necessary because the bearing is greased for the life of the bearing.
Deep groove ball bearings with a groove and lock are suitable for a shaft diameter of 10mm - 130mm. These bearings can be locked in the housing by means of the retaining ring. The method of axial confinement is simple and at the same time saves space.
2-row deep groove ball bearings are equipped with a filling hole and suitable for a shaft diameter of 15mm - 75mm. Miniature bearings are also available that are suitable for a shaft diameter of 3mm - 9mm. The miniature ball bearings are found in many applications. Due to the small space, the width of the sealed versions is often greater than that of the open version.
Many variants of the deep groove ball bearings are also available with flanges so that they can also be easily positioned axially.
Angular Contact Ball Bearings
Angular contact ball bearings are suitable for a combined load. They are specific to applications where high accuracy and high speed are required.
The angular contact ball bearings are available in two variants. The 1-row angular contact ball bearings that are suitable for a shaft diameter of 10mm – 200mm. The other variant is the 2-row angular contact ball bearings that are suitable for a shaft diameter of 15mm – 100mm.
The standard contact angles of 1-row angular contact ball bearings are 15°, 30° and 40°. These are indicated by the suffixes 'C', 'A' (not listed) and 'B'. Bearings with a smaller contact angle are better suited for use at high RPM.
To increase the rigidity of the bearing structure, or to improve running accuracy, angular contact ball bearings are often preloaded. For high-precision paired angular contact ball bearings of class 5 or higher, used in machine tools and other precision applications, the standard preload is indicated in three levels: light (L), medium (M) and heavy (H).
When the angular contact ball bearing is radially loaded, an axial force is generated in the bearing. In that case, two bearings in X arrangement are used, or two or more bearings relative to each other are used.
2-row angular contact ball bearings consist of two 1-row angular contact ball bearings in O-arrangement. These are integrated in one inner and outer ring.
Self-aligning ball bearings
Self-aligning ball bearings have a spherical raceway in the outer ring, the center of which is equal to that of the bearing. As a result, within certain limits, the balls and the cage continue to rotate during misalignment.
The self-aligning ball bearings are suitable for bearing constructions where significant shaft deflections and misalignment can occur. Bearings provided with a conical bore can be mounted on the shaft with the aid of a tension sleeve.
Self-aligning ball bearings come in cylindrical bore, conical bore and rubber seal variants. They are suitable for a bore diameter of 10mm – 100mm. In the case of a tapered bore, where the mounting is done with a tension sleeve, the self-aligning ball bearing is suitable for a bore diameter of 17mm – 90mm.
The range of ball bearings that Neita supplies is extensive and consists of the following categories:
- Ball bearings open
- Ball bearings with ZZ seal
- Ball bearings with 2RS seal
- 1-row angular contact ball bearings
- 2-row angular contact ball bearings
- 2-row self-aligning ball bearings
- 2-row self-aligning ball