Lubricant tips for use in INA plain bearings

Proper installation and maintenance is an important factor in the longest service life of INA bearings. At the same time, attention must be paid to the cleanliness of the bearings, the correctness of the choice of bearings and the selection of appropriate installation and maintenance tools. In addition, the plain bearings must be protected from contamination and moisture and ensure proper installation and lubrication. Therefore, the design of the bearing arrangement, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even the special maintenance play the same and important role.
4, mixed grease
Never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually be soft. In the end, the sliding bearings may be damaged due to the easy loss of grease. If you don't know which grease is used in the INA bearing, you must completely remove the old grease inside and outside the bearing before adding new grease.
There are usually the following basic requirements for lubricants:
(1) It has sufficient lubricating effect, which can reduce the friction of the bearing and inhibit the harmful wear process in the bearing. The frictional resistance is small and the anti-wear ability is large.
(2) Preventing corrosion of the bearing, which itself does not cause corrosion, deterioration or deformation of components of the sliding bearing (such as copper cages, rubber seals, etc.).
(3) It is possible to maintain the necessary lubricating performance within the range of the upper and lower limits of the specified operating temperature, and the chemical composition is stable and the viscosity does not change much.
(4) A sufficiently thick oil film can be established within the range of the upper and lower limits of the specified working speed; it is clean, free of impurities, and has good defoaming properties.
(5) Physical properties and chemical properties are stable enough during the required working period or during the inventory period, so as not to affect the quality of the use.
(6) Maintenance and maintenance are simple and the attachments are as small as possible.
(7) Under the premise of meeting the above technical requirements, economically strive to save.
2. Additional requirements for lubricants
(1) has a good cooling effect.
(2) It has strong adhesion to the surface to be lubricated, and leakage, dripping or scattering is as small as possible; water separation is good.
(3) Mixing a small amount of impurities (such as moisture) does not affect its performance.
(4) It acts as a seal to prevent water or dirt from entering the bearing.
(5) It is not easy to transmit vibration or reduce noise.
(6) Centralized lubrication can be implemented.
3. Special requirements for lubricants
Under special conditions, the following special requirements must be imposed on the lubricant:
(1) Long life requirements Lubricants are required to have a particularly long service life.
(2) Low friction torque requirements The frictional resistance of the lubricant is required to be low.
(3) Requirements for high temperature resistance It is required to withstand high temperatures above 250 °C.
(4) Low temperature resistance requirements It is required to withstand low temperatures below -63 °C.
(5) High vacuum resistance requirements Under high vacuum conditions, it is not volatile, does not dissipate, and does not deteriorate, especially under high vacuum conditions under weightless conditions.
(6) Harmless requirements
Mainly according to temperature and working conditions: grease can be classified according to their allowable working temperature. The consistency and lubricating ability of grease are affected by working temperature. Sliding bearings operating at a certain temperature must be selected at the same temperature. Grease with consistency and good lubrication. Grease is manufactured in different operating temperature ranges and can be roughly classified into low temperature, medium temperature and high temperature greases. At the same time, there is a type of grease called extrusion resistance or extrusion resistance and the addition of molybdenum disulfide, and at the same time, an additive is added thereto to strengthen the strength of the lubricant film.
If the grease is wrongly selected, all measures to prevent the bearing are futile. It is important to choose a grease whose base oil viscosity provides sufficient lubrication at the working temperature. The viscosity is mainly affected by temperature, and it varies with temperature. It rises and falls, and when the temperature drops, it rises. Therefore, it is necessary to know the viscosity of the base oil at the operating temperature. Mechanical manufacturers usually specify the use of certain greases, but most standard greases are available in a wide range of applications.

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INA outer spherical bearing lubricants to solve the problem

INA bearing will change its bearing capacity, rotation precision and wear resistance due to its own quality and external conditions during use. When the performance index of the outer spherical bearing is lower than the use requirements and cannot work normally, the bearing will occur. If the fault occurs or even fails, the machine and equipment will stop and there will be various abnormal phenomena such as loss of function in case of failure of the bearing, etc. Therefore, it is necessary to find out the cause in a short period of time and take corresponding measures.
In order to maintain the bearing under good conditions, it should maintain its proper performance and long-term use. Bearings must be inspected and maintained. Inspection and maintenance are important to prevent malfunctions. During operation, it is important to check the rolling noise, vibration, temperature and lubricant of the bearings.
Under the conditions of high speed and high temperature, the adjustment scheme of the combined position and clearance of the outer spherical bearing can be oil lubricated when the grease lubrication is not suitable. A large amount of heat can be taken away by the circulation of the lubricating oil. Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces. The viscosity of lubricating oil at INA bearing working temperature is generally 12-15cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity. Commonly used lubricating oils include mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, cylinder oil, and the like.
Oil lubrication methods include:
a. Oil bath lubrication
Oil bath lubrication is the most common lubrication method. It is suitable for the lubrication of low and medium speed bearings. Part of the bearing is immersed in the groove. The lubricating oil is brought up by the rotating bearing parts and then flows back to the oil groove. The oil level should be slightly lower than the minimum. The center of the rolling element.
b. drip lubrication
Drip lubrication is suitable for the outer spherical bearing parts that need to be quantitatively supplied with lubricating oil. Considering the structural design of the bearing supporting parts during thermal expansion, the amount of dripping is generally one drop every 3-8 seconds, and excessive oil quantity will cause the bearing temperature to increase.
c. Circulating oil lubrication
The filtered oil is delivered to the bearing components by an oil pump, filtered through the lubricating oil after the bearings, and then cooled and used. Since the circulating oil can take away a certain amount of heat and cool the bearing, this method is suitable for INA bearing parts with high speed.
d. Spray lubrication
The dry compressed air is mixed with the lubricating oil through a sprayer to form an oil mist. In the jet bearing, the air flow can effectively cool the outer spherical bearing and prevent the intrusion of impurities. This method is suitable for the lubrication of high speed, high temperature bearing components.
e. Injection lubrication
The high-pressure oil is injected into the bearing through the nozzle by the oil pump. The basic formula of the fatigue life calculation of the rolling bearing is injected into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling elements and the cage also form a gas flow at the relatively high rotation speed of the surrounding air. It is difficult to send the lubricating oil to the bearing by the general lubrication method. At this time, the lubricating oil must be sprayed by the high-pressure injection method. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.
Many reasons for the failure of the bearing, in addition to the normal fatigue spalling, such as failure of the seal, too small bearing clearance caused by over-tightening or poor lubrication can leave special failure marks and failure forms. Therefore, the failure of the bearing is checked in most Time can be found to cause the failure of the bearing and take countermeasures in time. Generally speaking, 1/3 of the failure of the INA bearing is because the bearing has reached the normal failure of the fatigue spalling period; 1/3 because of poor lubrication, leading to premature failure 1/3 because of pollution The material enters the bearing or is incorrectly installed, causing the bearing to fail prematurely. Generally speaking, when the outer spherical bearing is not working properly, there are seven common symptoms: bearing overheating, excessive bearing noise, low bearing life, high vibration, and no machine. Performance requirements, the bearing is loose on the shaft, and the shaft is difficult to rotate.

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