Bearings
Ball bearings
Where are ball bearings made of?
Ball bearings normally consist of bearing rings, rolling elements and a cage. The rolling elements are arranged between the inner and outer rings with a cage. This keeps the rolling elements in the correct ratio and position to each other so that they do not touch. In this way, a smooth rolling motion is achieved during operation.
Bearing rings
A bearing consists of an inner and outer ring. The inner ring is also called the raceway. In the case of ball bearings, a groove is also present in the ring. The inner ring is normally in contact with a shaft, the outer ring with a housing.
Rolling elements
The rolling elements are balls. There are many types of bearings with different shapes of a track roller, such as a trapezoid shape or a barrel shape.
Cage
The cage guides the rolling elements along the bearing rings, while 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
1-row deep groove ball bearings
Deep groove ball bearings are suitable for radial loading, but can also be axially loaded to a limited extent. The deep groove ball bearing is available in different variants. The 1-row variants are suitable for shaft diameters of 10mm - 200mm and are available as open bearings with a metal or rubber seal. The sealed variants are easy to apply and lubrication is not required as the bearing is greased for life.
Deep groove ball bearings with a groove and locking ring are suitable for shaft diameters of 10mm - 130mm. By means of the locking ring, these bearings can be locked in the housing. The method of axial locking is simple and saves space at the same time.
2-row deep groove ball bearings
2-row deep groove ball bearings feature a shim and are suitable for shaft diameters of 15mm -75mm. Also available are miniature bearings suitable for shaft diameter of 3mm - 9mm. Miniature ball bearings are found in many applications. By the way, due to the small space, the width of the sealed versions is often larger than that of the open version.
Many variants of 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 combined loads. They are specifically for applications where high accuracy and high speed are required.
Angular contact ball bearings are available in two variants:
- The 1-row angular contact ball bearings suitable for shaft diameter of 10 mm - 200 mm.
- The 2-row angular contact ball bearings suitable for shaft diameter of 15 mm - 100 mm.
The standard contact angles of 1-row angular contact ball bearings are 15°, 30° and 40°. These are designated by the suffixes "C", "A" (not shown) and B". Bearings with smaller contact angles are better suited for high-speed operation.
To increase the rigidity of the bearing assembly, 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 specified 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 this case, two bearings are used in an X arrangement, or two or more bearings are used relative to each other adjusted.
2-row angular contact ball bearings consist of two 1-row angular contact ball bearings in an O arrangement. They are integrated into one inner and outer ring.
Self-aligning ball bearings
Self-aligning ball bearings have a spherical raceway in the outer ring whose center is equal to that of the bearing. This, within certain limits, keeps the balls and cage rotating when misaligned.
Self-aligning ball bearings are suitable for bearing designs where significant shaft deflections and misalignments may occur. Bearings equipped with a tapered bore can be attached to the shaft using a drawbar bushing.
Self-aligning ball bearings come in variants with cylindrical bore, tapered bore and with rubber seals. They are suitable for a bore diameter of 10mm - 100mm. In the case of a tapered bore, where mounting is done with a pull bush, the self-aligning ball bearing is suitable for a bore diameter of 17mm - 90mm.
Product line
The range of ball bearings supplied by Neita is extensive and includes the following categories:
