Coefficient of Friction and Lubrication of Rolling Bearings
Author: hongyuanTime:
The sliding bearing shown in the reference value of the stable rotation friction coefficient under general conditions is generally 0.010.020.10.2 The friction coefficient of various bearings is the friction coefficient of the bearing type. In order to facilitate comparison with the sliding bearing, the friction moment of the rolling bearing can be calculated according to the inner diameter of the bearing by the following formula:
M=uPd/2 (M: friction torque, mN.m; u: friction coefficient, Table 1; P: bearing load, N; d: bearing nominal inner diameter, mm). The friction coefficient u is greatly affected by the bearing type, bearing load, rotational speed, lubrication method, etc. The reference value of the friction coefficient during stable rotation under general conditions is as follows.
For sliding bearings, generally u=0.01-0.02, sometimes up to 0.1-0.2. Composite bearing friction coefficient: 0.03~0.18
Bearing type Friction coefficient u
Deep groove ball bearing 0.0010-0.0015
Angular contact ball bearing 0.0012-0.0020
Self-aligning ball bearing 0.0008-0.0012
Cylindrical roller bearing 0.0008-0.0012
Full complement needle roller bearings 0.0025-0.0035
Needle roller bearing with cage 0.0020-0.0030
Tapered roller bearing 0.0017-0.0025
Spherical roller bearing 0.0020-0.0025
Thrust ball bearing 0.0010-0.0015
Thrust spherical roller bearing 0.0020-0.0025
4. Selection of rolling bearing lubrication method
Rolling bearing is an important mechanical component. Whether the performance of a mechanical equipment can be fully exerted depends on whether the bearing is properly lubricated. It can be said that lubrication is a necessary condition to ensure the normal operation of the bearing. It is important for improving the bearing capacity and Lifespan plays an important role. No matter what kind of lubrication form is used, lubrication can play the following roles in rolling bearings:
(1) Reduce the friction between metals and slow down their wear.
(2) The formation of oil film increases the contact area and reduces the contact stress.
(3) Ensure that the rolling bearing can operate normally for a long time under high-frequency contact stress, prolong the fatigue life,
(4) Eliminate frictional heat, reduce the temperature of the working surface of the bearing, and prevent burns.
(5) Play the role of dustproof, rustproof and anticorrosion.
Therefore, proper lubrication is very important for the normal operation of rolling bearings. The content of the lubrication design of rolling bearings mainly includes: the determination of reasonable lubrication methods, the correct selection of lubricants, the quantitative calculation of lubricant dosage and the determination of oil change intervals. Rolling bearing lubrication can generally be divided into three categories according to the type of lubricant used: oil lubrication, grease lubrication and solid lubrication. Among them, oil lubrication has a wider temperature range than other lubrication methods, and is more suitable for bearings working under high-speed and high-load conditions; at the same time, due to oil lubrication, it is also convenient for equipment maintenance and lubricant replacement, and the friction pairs in the system such as gears, etc. The advantage of being able to lubricate at the same time, so far, the use of oil lubrication for bearings is the most common. Grease lubrication has the advantages of simple sealing device, low maintenance cost and low grease cost, etc. It is widely used in bearings operating at low speed, medium speed and medium temperature. Especially in recent years, the advent of anti-wear additives has improved the lubricating performance of grease, making grease lubrication more widely used. If oil lubrication and grease lubrication cannot meet the lubrication conditions required by the bearing, or cannot meet the specific working conditions, solid lubricants can be used, or try to improve the lubrication performance of the bearing itself.
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