Specification, size, accuracy and selection of suitable tapered roller bearings are prerequisites to ensure the service life and reliability of the bearings according to the service position, working conditions and environmental conditions.
Use part: tapered roller bearing is suitable for bearing radial load radial and axial joint load, usually with two sets of tapered roller bearing, the main reason is the front hub and the rear hub of the transmission part, active bevel gear, differential, automotive reducer, etc..Allowable speed: 0.3-0.5 times the limit speed of properly mounted bearings, good lubrication.In general, 0.2 times the limit speed is the most appropriate.Angle of inclination allowed: tapered roller bearings are generally not allowed to tilt the shaft with respect to the housing hole and, if tilted, not more than 2mm.Allowable temperature: under normal load, ordinary bearings are allowed to work at ambient temperatures from -30°C to 150°C, and the lubricant has high temperature resistance and good lubrication.
Choice of bearing grease
Improper lubrication accounts for 36% of the causes of premature failure of tapered roller bearings.General grease does not meet the needs of a variety of special bearing applications, use only one or all of the general grease to meet the needs of all bearing applications, the problems can far beyond the advantages of a unified brand.Bearing applications are very diverse, the correct lubrication is the grease and bearing application conditions match.
Bearing grease is the basis for bearing stability, operation and maximum reliability, even under the most extreme operating conditions.Grease prevents contaminants from entering the bearing, cushioning the impact load and preventing corrosion.Selecting suitable grease in practical application is the basic condition for obtaining the maximum service life of bearing.
Criteria for proper selection of lubricants include type and size, temperature, speed, load, expected service life and supplementary lubrication period of tapered roller bearings.
The initial radial action of the bearing decreases gradually during the push-in process, and the size of the push-in determines the degree of cooperation.Therefore, the initial radial motion of tapered roller bearings must be measured before installation.During the bearing thrust, radial clearance is continuously measured until the required radial clearance reduction and the required interference fit are achieved.
Since the temperature is affected by lubrication, rotation speed, load and the environment, the median only indicates the approximate temperature range.Bearing lubrication plays an important role in the fatigue life, friction and wear, temperature rise and vibration of rolling bearings.The bearing will not work without proper lubrication.The analysis of the damage causes of tapered roller bearing shows that about 40% of the damage of tapered roller bearing is related to the bearing lubrication.Therefore, good lubrication of tapered roller bearings is an effective measure to reduce friction and wear of bearings.In addition, the bearing lubrication has a variety of functions, such as heat dissipation, rust prevention, sealing, impact, bearing lubrication effect can be summarized as follows:
A. A film of oil is formed between two rolling or sliding surfaces to reduce friction and wear on contact surfaces.
B. When using oil for lubrication, especially for circulating oil lubrication, oil mist lubrication and oil injection lubrication, the lubricating oil can take away most of the friction heat inside the bearing and play a role of heat dissipation.
C. When the grease is used for lubrication, it can prevent dust and other foreign substances from entering the tapered roller bearings to play a sealing role.
[d]. Lubricants prevent metal from rusting.
E. Prolong the fatigue life of tapered roller bearings.