The role and precautions of tapered roller bearings

Tapered roller bearings mainly bear radial and axial combined loads. The bearing capacity of the bearing depends on the raceway angle of the outer ring. The larger the angle, the greater the load carrying capacity. This type of bearing is a split type bearing, which is divided into single row, double row and four row tapered roller bearings according to the number of rows of rolling elements in the bearing. The clearance of single-row tapered roller bearings needs to be adjusted by the user during installation; the double-row and four-row tapered roller bearing clearances are given according to user requirements when the product leaves the factory, and no user adjustment is required.

Tapered roller bearings have a conical inner ring and an outer ring raceway, and tapered rollers are arranged between the two. The projection lines of all conical surfaces converge at the same point on the bearing axis. This design makes tapered roller bearings particularly suitable for bearing composite (radial and axial) loads. The axial load capacity of the bearing is mostly determined by the contact angle α; the larger the angle α, the higher the axial load capacity. The angle size is expressed by the calculation coefficient e; the larger the e value, the larger the contact angle, and the greater the applicability of the bearing to the axial load.

Tapered roller bearings are usually of a separate type, ie a conical inner ring assembly consisting of an inner ring with a roller and cage assembly can be mounted separately from the outer bevel (outer ring).

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

The secondary reason for the emergence of tapered roller bearings in the process of installation is that the bearing is being assembled, the inner ring and the outer ring are slanted during assembly; or the load is in the process of assembly and assembly, and the bearing is formed. .

When the tapered roller bearing is being installed, it should be stopped according to the working specifications. If a lot of achievements are not formed, if the form or method of the device is not used, the bearing raceway surface and the bone surface will form a wound-like line. The deep groove ball bearing device indirectly reflects the precision, life and function of the bearing.

Although the quality of tapered roller bearings is better in all aspects, rolling bearings are precision components, and their use must be carried out with caution. No matter how high-performance bearings are used, if not used properly, the expected high performance will not be achieved. The following precautions for the use of bearings are as follows:

(1) Keep the tapered roller bearing and its surroundings clean.

Even small dust that is invisible to the eyes can have a bad effect on the bearings. Therefore, keep the area clean so that the dust does not intrude into the bearing.

(2) Use with caution.

In the use of the tapered roller bearing strong impact, it will produce scratches and indentations, which is the cause of the accident. In severe cases, it will crack and break, so you must pay attention.

(3) Use the appropriate operating tools.

Avoid using existing tools instead and use the right tools.

(4) Pay attention to the corrosion of tapered roller bearings.

When operating the bearing, the sweat on the hand can cause rust. Be careful to use a clean hand, it is best to wear gloves as much as possible.

Tapered roller bearings use auditory to identify irregular movements. A common method is to use an electronic stethoscope to detect abnormal noise in a part that is experienced by an operator. If the bearing is in good working condition, it will make a low humming sound. If it is a sharp squeaky tapered roller bearing, arpeggio and other irregular sounds, it usually indicates that the bearing is in poor working condition. 1. Corrugated surface corrosion: Spectral analysis found that the concentration of non-ferrous metal elements was abnormal; many sub-micron-scale wear particles of non-ferrous metal components appeared in the iron spectrum; the lubricating oil exceeded the standard and the acid value exceeded the standard.

2, the surface of the journal is strained: there are iron-based abrasive grains or black oxide particles in the iron spectrum, and there is tempering color on the metal surface.

3, the surface corrosion of the journal: Spectral analysis found that the concentration of iron is abnormal, there are many sub-micron particles of iron in the iron spectrum, and the moisture of the lubricating oil exceeds the standard or the acid value exceeds the standard.

4. Surface strain: The cutting abrasive grains are found in the iron spectrum, and the abrasive grains are non-ferrous metals.

5, fretting wear behind the tile: spectral analysis found that the iron concentration is abnormal, there are many iron components in the iron spectrum sub-micron wear particles, lubricating oil moisture and acid value is abnormal.

Under liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced. The oil film also has a certain vibration absorbing capability.

Sharp squeaking noise may be caused by improper lubrication. Improper bearing clearance can also cause metallic sound. The dents on the outer ring track of the tapered roller bearing cause vibration and smooth and crisp sound. If the knocking damage caused by the installation is also caused by noise, the noise will vary with the speed of the bearing. If there is intermittent noise, it means that the rolling parts may be damaged. The sound of the tapered roller bearing occurs when the damaged surface is crushed. If there is a pollutant in the bearing, it will often cause a noise, and serious bearing damage will occur. Produces irregular and huge noise.

Bearing damage can be detected by hearing, but usually the bearing must be replaced immediately. Therefore, a better method is, for example, the use of an electronic condition monitoring instrument, and the tapered roller bearing pre-ruptures the operation of the bearing.