FAG needle roller bearing and lubricating oil

The function of the FAG bearing is to make the stationary ring and the rotating ring of the needle bearing and the stationary part (usually the bearing seat) and the rotating part (usually the shaft) of the mounting part are respectively fixed together, thereby transmitting the load under the rotating state. And the basic task of defining the position of the motion system relative to the stationary system.

On the shaft and in the housing, the rolling bearing requires its position to be fixed in three directions: radial, axial and tangential directions. Radial and tangential positioning is achieved by tight fit of the bearing ring. Axial positioning is only used in a few cases; usually axial stops are used, such as end caps and retaining rings. Limited to the clearance range.

FAG bearings should pay attention to the following four points when choosing to cooperate

The circumferential surface of the bearing ring should have good support and uniform force to reduce deformation and give full play to the bearing capacity of the FAG bearing;

The bearing ring cannot slide in the tangential direction in its mating surface, otherwise the mating surface will be damaged;

The free end bearing must be compatible with the length change of the shaft and the housing bore, ie it must have the ability to accommodate the axial position to swim within a certain range;

It is necessary to make the needle roller bearing easy to install and disassemble, saving labor, time and money.

It is very beneficial to make good use of the needle roller bearing. I also hope that everyone will fully consider the above four points when choosing.

For grease-lubricated bearings and oil seals or dust caps on both sides, the FAG bearing seals do not need to be cleaned before installation. Check the size and finishing of the relevant parts.

1, grease lubrication

Relubrication of FAG bearings is best carried out during planned equipment downtime and is periodically replenished, while removing old grease or extruding old grease through the drain. Wipe the grease fittings clean before adding fresh grease. If the bearing housing does not have a grease fitting, the bearing housing cover or end cap should be opened to remove the old grease and, after cleaning, replenish the same type of fresh grease.

2, lubricating oil lubrication

Regularly check the oil level and oil quality of the lubricating oil. Under normal circumstances, the normal oil level should be within the range of 1/3-2/3 of the equipment oil level window or mark. The oil filling method is oil cup, the oil level shown only represents the oil replenishing capacity, and the bearing tank oil level is to meet the operation requirements. The oil level in the oil cup is less than 1/4 of its total volume.

Check and replenish the oil method, take a small amount of lubricating oil as a sample and compare it with fresh oil. The competent unit can consider the oil quality test to ensure the oil quality is qualified. If the sample looks cloudy, it may be the result of mixing with water, which is commonly referred to as oil emulsification. At this point, the lubricant should be replaced.

If the sample is darkened or thickened, it may indicate that the lubricant has begun to carbonize and the old lubricant should be completely replaced. If possible, flush the oil line with fresh oil. When changing the lubricating oil, make sure that the new and old models of the replaced oil are the same and supplement the required oil level.

Use an oil bath type lubrication system. If the oil temperature is below 60 ° C (140 ° F) and the lubricant is not contaminated, replace the lubricant once a year. If the oil temperature is between 60-100 ° C (140-210 ° F), the lubricant needs to be replaced four times a year. If the oil temperature is between 100 and 120 ° C (210-250 ° F), the lubricant needs to be replaced once a month. If the oil temperature is above 120 ° C (250 ° F), the lubricant needs to be replaced once a week.

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Lubrication points during the operation of FAG linear bearings

Mix two incompatible oils and never mix incompatible oils. Usually the consistency will be soft, and finally the damage will be caused by the loss of grease. If you don't know the grease you used in FAG bearings, you should first remove all the original grease and then add a grease to lubricate.

In the process of using linear bearings, we often encounter such a situation. How are these situations formed? How to solve them when they are formed has always been the biggest headache for the technicians of major enterprises. The causes and solutions for the phenomenon of overheating of the bearing during use are explained in detail: The instantaneous high temperature in the grinding zone can be heated to a temperature higher than the tempering heating temperature of the workpiece at a certain depth (10 to 100 nm). In the case where the austenitizing temperature is not reached, as the temperature to be heated is increased, the surface layer will be re-tempered or high-temperature tempered in accordance with the heating temperature, and the hardness will also decrease. The higher the heating temperature, the more the hardness decreases.

In the grinding process, the grinding wheel and the workpiece contact area consume a large amount of energy, generating a large amount of grinding heat, resulting in local instantaneous high temperature in the grinding zone. Using the linear heat transfer heat transfer theoretical formula to derive, calculate or apply the infrared temperature and thermocouple method to measure the instantaneous temperature under experimental conditions, it can be found that the instantaneous temperature in the grinding zone can be as high as 1000-1500 °C in 0.1-0.001 ms. Such instantaneous high temperature is sufficient to cause high temperature oxidation, amorphous structure, high temperature tempering, secondary quenching, and even burn cracking of the surface layer at a certain depth on the working surface.

The surface of the steel under transient high temperature acts on the oxygen in the air and rises into a very thin (20-30 nm) thin layer of iron oxide. It is worth noting that the thickness of the oxide layer is corresponding to the test results of the total thickness of the surface-grinding metamorphic layer. This shows that the thickness of the oxide layer is directly related to the grinding process and is an important indicator of the quality of the grinding.

The grease used in FAG bearings has rust resistance. The performance of rust prevention is mainly based on the solubility of oil, different viscosity and grease formed by different materials, with different levels of anti-volume and anti-rust properties. Generally speaking, the viscosity is large and the fat solubility is poor. The grease is more water-repellent. Even if the grease is filled with water in the linear bearing cavity, it can form a layer of oil film that can resist the appearance of the steel. Because of the low rotation speed of the bicycle, the choice of grease can be relatively high, but the water resistance is very strong. Because the bicycle is often used in car wash, rain, and off-road, it is very important to deal with water, even if it is The slightly viscous grease will not affect the smoothness under low rotation, and once the surface is oxidized, the entire peeling process and aging process will be rapidly intensified.

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The difference between SKF bearing vibration type and common type

The ferrule of the vibrating SKF bearing and the shaft or the seat hole require a certain transition fit or interference fit. When the interference size is SKF bearing under load, the mating surface of the SKF bearing ring on the shaft or the seat hole There is no "squirming" phenomenon on the principle.

First, let's talk about the SKF bearing vibration type. The inner and outer rings and rolling elements of the SKF bearing vibration type use vacuum degassing bearing steel, which has good fatigue resistance. Moreover, the cage is made of aluminum-iron-manganese bronze material, which has high strength, good elasticity and better wear resistance.

Second, let's look at the ordinary type of SKF bearings. SKF bearings are made of ordinary bearing steel for the inner and outer rings and rolling elements. There is also a cage made of zinc brass, which has low strength and poor elasticity.

So, how to choose SKF bearing vibration type or SKF bearing common type? The following three points are available for reference:

1 Fixed load, fixed load is characterized by a synthetic radial load vector and the ferrule is relatively stationary.

2 Rotating load, the characteristic of the rotating load is that the synthetic radial load vector rotates relative to the ferrule.

3 oscillating load and variable load, oscillating load is the load that is synthesized by rotating load much smaller than fixed load. The oscillating load means that the load applied to some ferrules may sometimes be a rotating load, sometimes a fixed load, and sometimes a oscillating load.

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SKF bearing damage causes and maintenance

Not all damaged bearings can be repaired, but for each damaged bearing, the cause and extent of damage must be evaluated to avoid or reduce re-damage before considering repairing or replacing a new bearing. There are many reasons for damage to SKF bearings, such as improper installation, dirt intrusion or moisture intrusion, which are common causes of early damage to many SKF bearings. Analysis of common causes of damage to SKF bearings and corresponding precautions that extend the life of SKF bearings.

A. Improper operation:

Improper installation, operation or disassembly may cause deformation or defect of the cage

Precautions: Use appropriate handling, installation and removal tools

B. Insufficient lubrication:

Insufficient or improper lubrication may result in component scratches or severe bearing deformation

Precautions: Improve the lubrication system and properly replenish or replace the lubricant at regular intervals

C. Rusty and corrosion:

Contact with water can cause the bearing components to erode and rust. Bearings after rust damage may cause spalling during work

Precautions: Regularly check the seal to ensure a good sealing effect and properly store SKF bearings

D. Current:

Powering up the bearing as it rotates may result in grooves or nicks. Improper electrical grounding can cause minor burns when the bearing is stationary

Precautions: Reduce or avoid current flow through the bearings by properly grounding the connections before parts other than SKF bearings

E. External materials:

Abrasion particles contamination and debris intrusion may cause wear, abrasion and dents on the SKF bearing face

Precautions: Remove invading particles and debris, replace lubricant, check sealing system

F. eccentric:

Eccentricity, tilting, or excessive loading can cause geometric stress concentrations or surface spalling

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