In the daily use of NTN Bearings, we must pay attention to daily maintenance and lubrication, which can improve the product's working efficiency and service life, and save a lot of costs. The user can choose specifications according to the use location, use conditions and environmental conditions Size, accuracy, and suitable tapered roller bearings are the prerequisites to ensure bearing life and reliability.
Location of use: Tapered roller bearings are suitable for combined radial and axial loads that are mainly radial loads. They are usually paired with two sets of tapered roller bearings, which are mainly used in front and rear hubs, active tapered gears, Transmission parts such as differentials and reducers.
Allowable speed: Under the environment of correct installation and good lubrication, it is allowed to be 0.3-0.5 times of the limit speed of the bearing. Under normal circumstances, the limit speed of 0.2 times is the most suitable.
Permissible tilt angle: Tapered roller bearings generally do not allow the shaft to be tilted relative to the housing hole. If tilted, the maximum is no more than 2′.
Permissible temperature: Under the condition of bearing normal load, and the lubricant has high temperature resistance and sufficient lubrication, the general bearing is allowed to work at an ambient temperature of -30℃-150℃.
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Selection of bearing grease:
Improper lubrication accounts for 36% of the causes of premature failure of tapered roller bearings. General-purpose grease cannot meet the needs of various special bearing applications. Only one or all kinds of general-purpose grease are used to meet all bearings The problems caused by the application will far exceed the benefits brought by the unified brand. Bearing application conditions are very diverse. Proper lubrication requires that the grease matches the bearing application conditions.
Bearing grease is the basis for ensuring smooth, worry-free operation and maximum reliability of the bearing, even under the most extreme working conditions. Grease prevents contaminants from entering the bearing, cushions impact loads and prevents corrosion. Choosing the right grease in practical applications is the basic condition for obtaining the maximum service life of bearings.
The criteria for the correct selection of lubricants include the type and size of tapered roller bearings, temperature, speed, load, and the expected service life and relubrication cycle.
The initial radial clearance of the bearing gradually decreases during the pushing-in process, and the pushing-in amount determines the degree of fit. Therefore, the initial radial clearance of the tapered roller bearing must be measured before installation. In the process of pushing the bearing, the radial clearance is continuously measured until the required radial clearance reduction and the ideal interference fit are reached.
Since the temperature is affected by lubrication, speed, load, and environment, the values in the table only indicate the approximate temperature range. The role of bearing lubrication Lubrication has an important impact on the fatigue life and friction, wear, temperature rise and vibration of rolling bearings. Without normal lubrication, the bearing cannot work. Analysis of the causes of tapered roller bearing damage indicates that about 40% of the bearing damage is related to poor lubrication. Therefore, good lubrication of tapered roller bearings is an effective measure to reduce bearing friction and wear. In addition, the lubrication of the bearing also has many functions such as heat dissipation, rust prevention, sealing, and cushioning impact.
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The brief description of the role of bearing lubrication is as follows:
a. Form an oil film between the two rolling surfaces or sliding surfaces that are in contact with each other to reduce the friction and wear of the contact surfaces.
b. When oil lubrication is used, especially when circulating oil lubrication, oil mist lubrication and oil injection lubrication are used, the lubricating oil can take away most of the frictional heat inside the bearing and play an effective heat dissipation role.
c. When grease lubrication is used, it can prevent foreign dust and other foreign substances from entering the tapered roller bearing and play a sealing role.
d. Lubricants have the function of preventing metal corrosion.
e. Extend the fatigue life of tapered roller bearings.
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