Talking about the proofreading of bearing self-aligning performance

The ability of the rolling bearing to automatically compensate for the relative deflection of the bearing and the centerline of the housing, thereby ensuring the normal working condition of the bearing, is called the aligning of the rolling bearing.

Due to the machining and installation errors of the bearing housing bore and the shaft, as well as the flexural deformation of the shaft after loading, the shaft and the inner and outer ring axes are unlikely to remain coincident during operation, which may cause a certain deflection. Axis deflection will cause an uneven distribution of the internal contact stress of the bearing. Causes early failure of the bearing. Therefore, in general design, the assembly design requirements should be improved as much as possible. For the case where the deformation of the winding is large, the bearing with good centering performance should be selected.

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Talking about the structure characteristics of double row series bearing

The invention of "ball roller bearings" is based on a genius idea, which is a combination of new rolling elements and new assembly methods. All spheres of the traditional rolling "ball" that do not bear the load are removed. This means that 15% of the diameter of the sides of the ball is cut. The result is the so-called ball roller, a flat ball on both sides, which is 30% narrower than the real ball. This significantly saves valuable space.

In addition, such specially shaped "slim" ball rollers and specially developed assembly methods can increase the number of rolling bodies to approximately 90% of the filling space. More rolling elements in the same space allow for higher load ratings for longer product life. This also provides new opportunities to reduce product size and assembly. The dual cage design allows for optimal independent adjustment of the two raceways and is perfectly matched to the application. This ensures maximum load support with minimal bearing size and lower friction.

Rolling bearings fail due to the constant wear of the bearings during the movement. The grease (oil) and the lubrication method are different, which has different effects on reducing the friction and wear of the bearings. Therefore, lubrication technology has become an important part of bearing technology research. Some people refer to grease (oil) as the "fifth part of the bearing" (others are inner ring, outer ring, rolling element, cage).

The resistance to the rotation of the rolling bearing consists of rolling friction, sliding friction and lubricant friction. Rolling friction occurs when the rolling bodies roll on the raceway; the sliding friction occurs on the guide faces of the rolling bodies in the cage, on the rib guide faces of the cage and on the roller end faces and the ferrule ribs in the roller bearings. The friction of the lubricant consists of the internal friction of the lubricant at the contact and the agitation and extrusion of the lubricant. The total friction of a set of bearings, ie the sum of rolling friction, sliding friction and lubricant friction, is the resistance of the impedance bearing movement. The task of studying lubrication technology is to develop different greases (oils) and their lubrication methods to minimize bearing resistance and longest life.

Bearing grease (oil) under common working conditions, foreign advanced industrial countries have completely passed the technology and production, and have formed a series of varieties and batch production capacity. The current main trend is to study the performance of grease under some special circumstances. For example, it is being studied to improve the vacuum stability, creepability and viscosity-temperature performance of perfluoroether grease for aerospace; and, for example, low-temperature grease, although it has good effects in application, its lubrication mechanism does not have a good theory. set forth. For another example, it is studied to use a gaseous lubricant at a high temperature (200 to 4000 degrees).

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How to guarantee the service life of NSK bearings

It is important to keep the NSK bearings and lubrication clean.

Clean the surface of the machine before inspection and then remove the parts around the NSK bearing. The oil seal is a very fragile part, so be careful to disassemble it. Do not apply excessive force. Then carefully check the oil seal and its surrounding parts. If it has shown bad symptoms, be sure to replace it. Poor oil seal will cause NSK bearing. Damage and severe equipment downtime.

Cover the exposed NSK bearings:

When inspecting NSK bearings, never expose NSK bearings to contaminants or moisture. If the work is interrupted, the machine should be covered with a piece of oil-paper plastic or similar material.

If the unshielded NSK bearing is cleaned without performing disassembly and may be inspected, wash it with a white spirit with a brush for application, then dry it with a lint-free cloth or blow it with compressed air. Dry (be careful not to let the NSK bearing assembly start to rotate).

Check the lubricant:

Apply a little bit of lubricant to the friction between the two fingers. If any contaminants are present, feel it, or apply a thin layer of lubricant on the back of the hand, then seal the light.

Replace the lubricant:

Oil-lubricated NSK bearings, after draining the old oil, if possible, refill with fresh oil and allow the machine to spin at low speed for a few minutes. Whenever possible, the oil collects the contaminants from the wreckage and then vents the oil. The oil is preferably filtered before use.

Grease-lubricated NSK bearings should be replaced with a cotton joint to any part of the NSK bearing when replacing the grease, as these residual fibers may wedge between the rolling elements and cause damage. In particular, the application of small NSK bearings needs to pay attention to this problem.

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Characteristics of grease performance in motor NTN bearings

Good adaptability, high and low temperature performance, common in indoor and outdoor, north and south.

The suitable consistency has a good damping effect, which can reduce the noise of the motor NTN bearing and is beneficial to environmental protection.

Good fluidity, generally requires the use temperature is -25 °C - 120 °C, the starting torque is small, the running torque is low, the power consumption is small, and the temperature rise is low.

The insulation grade is A, E, B grade, and must not contain sulfur or chlorine extreme pressure additives.

The anti-oxidation performance is good. After long-term use, the appearance color and acidity of the grease change little, and there is no obvious oxidation phenomenon.

Long service life, extended maintenance cycle and reduced NTN bearing consumption.

It has strong rust and salt spray resistance and good water resistance, which can be used in harsh working environments.

Good lubricity and abrasion resistance, no oil, no drying, no emulsification, no loss, the grease itself should not contain solids.

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