Function and application of tapered roller bearing
Release time:2015/4/19 11:57:09
Tapered roller bearings are mainly subjected to radial and axial combined loads. The bearing capacity depends on the raceway angle of the outer ring. The larger the angle is, the greater the bearing capacity is. The bearings are separable bearings. They are divided into single row, double row and four row tapered roller bearings according to the number of rolling bodies in bearings. Single row tapered roller bearing clearance needs to be adjusted when users install; double row and four row tapered roller bearing clearance has been given in accordance with user requirements when the product is out of the factory, without user adjustment.
Tapered roller bearings have conical inner ring and outer ring raceway, tapered roller arranged between the two. The projection lines of all conical surfaces are gathered at the same point on the axis of the bearing. This design makes tapered roller bearings particularly suitable for composite (radial and axial) loads. The axial load capacity of the bearing is determined by the contact angle alpha; the higher the alpha angle is, the higher the axial load capacity is. The angle is represented by the calculated coefficient E; the greater the E value, the greater the contact angle, the greater the applicability of the bearing to the axial load.
Tapered roller bearings are usually separable. The tapered inner ring assembly consisting of inner rings with rollers and cage assemblies can be separated from the tapered outer ring (outer ring).
Tapered roller bearings are widely used in automobile, rolling mills, mines, metallurgy, plastics machinery and other industries.
The main reason is that the emergence of tapered roller bearing device in the process are: bearing device, when assembling the emergence of the inner and outer rings of skew; or perhaps the emergence of load device and assembling charge into the enemy ranks are in the process of the final formation bearing the emergence of scars.
Is the device of tapered roller bearings should be in accordance with the standard to stop, not many achievements, such as to form or not when the device, it will form a linear scar formation of the emergence of bearing raceway surface and rolling bearing surface. Device of deep groove ball bearings with indirect reaction precision, and use the function of bearing life.
Although the quality of tapered roller bearing is better, but the rolling bearing is a precision component, and its use must be carefully carried out accordingly. No matter how high performance bearings are used, if not used properly, the desired high performance will not be achieved. The following items should be noticed in the use of bearings:
(1) keep tapered roller bearings and their surroundings clean.
Even small dust that can't be seen by the eye can cause bad effects on the bearings. So, keep the area clean so that the dust doesn't invade the bearings.
(2) use carefully.
In the use of tapered roller bearings, strong impact, will produce scars and indentation, become the cause of the accident. In severe cases, cracks and fractures will occur, so attention must be paid.
(3) use proper operating tools.
Avoid using existing tools instead of using appropriate tools.
(4) attention should be paid to the corrosion of tapered roller bearings.
When the bearing is operated, the sweat on the hand will be the cause of rust. Be careful with clean hands, and you'd better wear gloves as much as possible.
Running roller bearings use hearing to identify irregular cone is a very common method, examples such as the use of electronic stethoscope to certain parts of the abnormal noise is experienced operator. If the bearing is in good working condition will make a low humming sound, if a sharp hissing sound of tapered roller bearings, squeaking sound and other irregular sound, usually expressed in adverse operating conditions of the bearings.
1, tile surface corrosion: spectral analysis found that non-ferrous metal concentration anomalies; iron spectrum appeared in many non-ferrous metal components of sub micron wear particles; lubricating oil moisture exceeded acid value exceeded.
2, the neck surface damage: iron in the iron cutting abrasive particles or black oxide particles, the metal surface has tempering color.
3, the surface of the journal corrosion: spectral analysis found that iron concentration anomaly, iron spectrum in the presence of a lot of iron particles of submicron particles, lubricating oil moisture exceeded or acid value exceeded.
4, surface damage: iron spectrum found in the cutting abrasive particles, wear particles for non-ferrous metals.
5. Fretting wear of the back of the tile: spectral analysis shows that the iron concentration is abnormal. There are a lot of ferrous submicron wear particles in the iron spectrum, and the water and acid value of lubricating oil is abnormal.
Under the condition of liquid lubrication, the sliding surface is separated from the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced, and the oil film also has a certain vibration absorption ability
The sharp squeak noise may be caused by improper lubrication. Improper bearing clearance can also cause metallic sound. A track on the taper roller bearings will cause vibration, resulting in smooth crisp sound, if the installation of the percussion scars will produce noise, the noise will with bearing speed vary. If intermittent noise, said rolling element may be damaged, tapered roller bearings, this sound is when the damage occurred in the surface is rolled out, bearing if hissing sound pollution often caused serious damage to the bearing will produce irregular and loud noise.
Bearing damage, of course, can be detected by hearing, but usually at this point already, the bearing must be replaced immediately. So, better ways, such as the use of electronic status monitoring instruments, tapered roller bearings in advance of the eruption of the bearings run.