Tapered roller bearings mainly bear combined radial and axial loads with radial loads being dominant. The load-carrying capacity of a bearing depends on the Angle of the raceway on the outer ring. The larger the Angle, the greater the load-carrying capacity. This type of bearing is a separable bearing. According to the number of rows of rolling elements in the bearing, it is classified into single-row, double-row and four-row tapered roller bearings. The clearance of single-row tapered roller bearings needs to be adjusted by the user during installation. The clearance of double-row and four-row tapered roller bearings has been set at the factory according to the user's requirements and does not need to be adjusted by the user.

Tapered roller bearings have conical inner and outer raceways, with tapered rollers arranged between them. All the projection lines of the conical surfaces converge at the same point on the bearing axis. This design makes tapered roller bearings particularly suitable for withstanding combined (radial and axial) loads. The axial load capacity of a bearing is mostly determined by the contact Angle α. The larger the α Angle, the higher the axial load capacity. The size of the Angle is expressed by the calculation coefficient e. The larger the e value, the greater the contact Angle, and the greater the applicability of the bearing to axial loads.

Tapered roller bearings are usually separable, meaning that the tapered inner ring assembly, which consists of an inner ring with roller and cage assemblies, can be installed separately from the tapered outer ring (outer ring).

Tapered roller bearings are widely used in industries such as automobiles, rolling mills, mining, metallurgy, and plastic machinery.

The main reason for the appearance of scratches on tapered roller bearings during installation is that the inner and outer rings of the bearings are skewed during installation and assembly. Perhaps it is the sudden charge load during the installation and assembly process that eventually causes scratches on the bearings.

When installing tapered roller bearings, it is necessary to follow the work specifications. Otherwise, many problems will occur. For example, if the installation form or method is incorrect, it will cause linear scratches on the raceway surface and rolling surface of the bearing. The installation of deep groove ball bearings indirectly reflects the precision, lifespan and performance of the bearings during use.

Although tapered roller bearings are of relatively good quality and other aspects, rolling bearings are precision components, and their use must also be carried out with corresponding caution. No matter how high-performance the bearings are, if they are not used properly, the expected high performance will not be achieved. There are several points to note regarding the use of bearings:

(1) Keep the tapered roller bearings and their surroundings clean.

Even tiny dust particles that are invisible to the naked eye can have a negative impact on bearings. Therefore, it is necessary to keep the surrounding area clean to prevent dust from entering the bearing.

(2) Use it carefully.

Strong impacts on tapered roller bearings during use can cause scratches and indentations, which can be the cause of accidents. In severe cases, cracks and fractures may occur, so special attention must be paid.

(3)Use the appropriate operation tools.

Avoid substituting existing tools; instead, use appropriate ones.

(4) Attention should be paid to the rusting of tapered roller bearings.

When operating bearings, sweat on your hands can be a cause of rusting. It is important to operate with clean hands and it is best to wear gloves if possible.

It is a very common method to identify irregular operation of tapered roller bearings by hearing. For example, experienced operators use an electronic stethoscope to detect abnormal noise from a certain part. If a bearing is in good operating condition, it will produce a low whining sound. If it makes sharp hissing sounds, squeaking sounds or other irregular sounds, it usually indicates that the bearing is in poor operating condition.

1. Tile surface corrosion: Spectral analysis reveals abnormal concentrations of non-ferrous metal elements; Many sub-micron-sized wear particles of non-ferrous metal components appeared in the ferrography. The moisture content and acid value of the lubricating oil exceed the standard.

2. Journal surface scratches: There are iron-based cutting abrasive particles or black oxide particles in the ferrography, and the metal surface has a tempering color.

3. Corrosion on the journal surface: Spectral analysis revealed abnormal iron concentration, with many sub-micron particles of iron components in the iron spectrum. The moisture content or acid value of the lubricating oil exceeded the standard.

4. Surface scratches: Cutting abrasive grains were found in the ferrography, and the composition of the abrasive grains was non-ferrous metals.

5. Fretting wear on the back of the bearing: Spectral analysis revealed abnormal iron concentration, numerous sub-micron wear particles of iron components in the iron spectrum, and abnormal moisture and acid values in the lubricating oil.

Under liquid lubrication conditions, the sliding surfaces are separated by lubricating oil without direct contact, which can significantly reduce friction losses and surface wear. The oil film also has a certain vibration absorption capacity.

The sharp squeaking noise might be caused by improper lubrication. Improper bearing clearance can also cause metallic sounds. Dents on the outer track of tapered roller bearings can cause vibration and produce a smooth and crisp sound. If they are caused by knocking marks during installation, noise will also be generated, and this noise will vary with the speed of the bearing. If there is intermittent noise, it indicates that the rolling elements may be damaged. For tapered roller bearings, this sound occurs when the damaged surface is rolled over. If there are contaminants inside the bearing, it often causes hissing sounds. Severe bearing damage can produce irregular and loud noises.