Daily maintenance of bearings


In daily production and life, it is necessary to check […]

In daily production and life, it is necessary to check the working performance of the bearing in time to achieve early detection and early maintenance.


1. Carry out bearing maintenance and assembly quality
Carry out the quality of bearing articulation to ensure that the back of the INA bearing is smooth and free of freckles, and the positioning bumps are intact and undamaged; the self-bounce amount is 0.5-1.5mm, which can ensure that the bearing bushes closely fit the bearing housing hole by virtue of their own elastic force after assembly; , When assembling, pay attention to check the processing quality of crankshaft journals and bearings, and strictly implement the repair process specifications to prevent improper installation and uneven torque of bearing bolts due to improper installation methods or non-compliance with the regulations, resulting in bending deformation and stress Concentration, leading to early damage to the bearing.


2. Improve the design and manufacturing process of bearings
When designing or selecting imported bearings, the thermal balance of the bearing should be considered to control the temperature rise. Because INA bearings work in a rubbing state, the power consumption is caused by the internal friction (viscosity) of the lubricating oil liquid, which will cause the temperature rise of the sliding bearing after being converted into heat. lubricating oil. The decrease in viscosity and the change of the gap will soften the babbitt alloy of the bearing, and cause the accident of "burning bush and holding shaft" in severe cases. Therefore, in the structural design, the oil inlet hole should be opened from the top of the upper bearing shell (non-loading area) of the bearing, so that the lubricating oil can be introduced from the non-loading area; the inner surface of the bearing shell has the oil inlet hole as the center along the longitudinal or transverse oil groove, Conducive to the uniform distribution of lubricating oil on the journal to control the temperature rise.

The criteria for the correct selection of lubricants include the type and size of the bearing, temperature, speed, load, and expected service life and relubrication intervals.


The initial radial clearance of the bearing is gradually reduced during the push-in process, and the amount of push-in determines the degree of fit. Therefore, the initial radial clearance of the roller bearing must be measured before installation. In the process of pushing in the INA bearing, the radial clearance is continuously measured until the required radial clearance reduction and the ideal interference fit are reached.


Because temperature is affected by lubrication, speed, load, and environment. The role of bearing lubrication Lubrication has an important impact on the fatigue life and friction, wear, temperature rise, vibration, etc. of rolling bearings. Without normal lubrication, the bearing cannot work. Analysis of the causes of bearing damage shows that about 40% of bearing damage is related to poor lubrication. Therefore, good lubrication of roller bearings is an effective measure to reduce bearing friction and wear. In addition, the lubrication of sliding bearings also has multiple functions such as heat dissipation, rust prevention, sealing, and impact mitigation. The role of bearing lubrication can be briefly described as follows:


a. A layer of oil film is formed between the two rolling surfaces or sliding surfaces that are in contact with each other to separate the two surfaces, reducing friction and wear on the contact surfaces.
b. When using oil lubrication, especially when using circulating oil lubrication, oil mist lubrication and oil spray lubrication, the lubricating oil can take away most of the friction heat inside the bearing and play an effective role in heat dissipation.
c. When using grease lubrication, it can prevent foreign matter such as external dust from entering the INA bearing and play a sealing role.
d. Lubricants have the effect of preventing metal corrosion.
e. Extend the fatigue life of roller bearings.

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