Analysis of the Influence of TIMKEN Micro-bearing Lubrication Method on Performance

When testing the advantages of chrome steel and stainless steel as TIMKEN bearing materials, they were found to not only have rust preventive effects. Chrome steel is the most common miniature bearing material. It is harder than stainless steel, so it lasts longer. However, at higher temperatures, its performance is not good.

At a high temperature of 120C, it undergoes tremendous deformation and the load is reduced. It can withstand a high temperature of 150C, but an instantaneous temperature of 150C or higher will reduce the life of the imported bearings. The heat treatment can subject the bearing to an elevated temperature of 170C.

The purpose of lubrication of TIMKEN bearings is to reduce internal friction and wear of the bearings, to prevent sticking, and the lubricating effect is as follows.

(1). Reduce friction and wear.

In the mutual contact portion of the ferrule, the rolling element and the retainer constituting the micro bearing, metal contact is prevented, and friction and wear are reduced.

(2). Extend fatigue life.

The rolling fatigue life of the bearing is prolonged when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the thickness of the lubricating oil film is not good, it is shortened.

(3). Discharge friction heat, cooling

The circulation oil supply method or the like can be used to discharge heat generated by friction or heat from the outside to cool. Prevent the bearing from overheating and prevent the lubricant from aging itself.

(4). Other

There is also the effect of preventing foreign matter from entering the inside of the bearing or preventing rust and corrosion.

Lubrication method:

The lubrication method of TIMKEN bearings is divided into grease lubrication and oil lubrication. In order to make the miniature bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing and comparing the advantages and disadvantages of grease lubrication and oil lubrication.

The most common stainless steel 440 for miniature bearings, it is hard enough and strong to load (20% less than brass steel), but it can resist rust, can withstand the instantaneous high temperature of 250C and the continuous high temperature of 300C. We often mistakenly think that all stainless steel is non-magnetic. 440 stainless steel is magnetic. It is not completely rust-proof, but is affected by salt, acid and alkali. The 316 grade has good rust resistance, no magnetic, but it is softer and therefore has less load. Because it is not strong, the 316 bearing is not accurate and feels rough.

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IKO cam bearing lubrication technique to solve the raceway noise analysis

The source of the rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise. It is well known that even if IKO bearing parts are processed using the most advanced manufacturing techniques in the world, there will always be small geometric errors in the working surface, which will cause small fluctuations between the raceway and the rolling elements to excite the natural vibration of the vibration system.

First, the bearing drip lubrication method

Drip oil lubrication is suitable for the bearing parts that need to be supplied quantitatively to the lubricating oil. The amount of oil to be dripped is preferably every 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.

Second, the oil bath lubrication method of cam bearings

Oil bath lubrication is the common lubrication method in most cam bearings and is suitable for lubrication of low and medium speed IKO bearings. A part of the bearing is immersed in the groove, the lubricating oil is brought up by the rotating bearing part, and then flows back to the oil groove oil surface should be slightly lower than the center of the lowest rolling element.

Third, the radiation lubrication of the bearing

The low pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling element and the cage also cause the surrounding air to flow at a relatively high rotational speed. It is difficult to send the lubricating oil to the bearing in a smooth manner. In this case, it is necessary to spray the smooth oil with low-pressure radiation. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.

Fourth, the bearing lubrication method

The oil is pumped to the cam bearing component by an oil pump, and then filtered and cooled by the lubricating oil after the bearing. Because the circulating oil can take away a certain amount of heat and cool the IKO bearing, this method is used for bearing parts with higher rotational speed.

Five, bearing spray lubrication method

The use of boring shrinking air is mixed with smooth oil through a sprayer to create an oil mist. In the radial bearing, the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the smoothness of high speed and low temperature bearing components.

Although the bearing raceway noise is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct selection of the bearing and the precise use of the bearing to reduce noise and vibration.

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