INA rolling bearing installation Common problems

First, how to choose grease?
Lubrication has a very important influence on the operation and life of the INA bearing. Here is a brief overview of the general principles for selecting grease. Grease is made of base oil, thickener and additives. The grease performance of different types and different grades varies greatly. The allowable rotation limit is different. Be careful when selecting. The performance of grease is mainly determined by the base oil. Generally, the low viscosity base oil is suitable for low temperature, high speed and high viscosity for high temperature and high load. The thickener is also related to the lubricating properties, and the water resistance of the thickener determines the water resistance of the grease. In principle, the different greases of the brand cannot be mixed, and even the grease of the same thickener may have a bad influence on each other due to the different additives.
Second, must the bearings be cleaned before installation?
The surface of the bearing is coated with anti-rust oil. You must clean it with clean gasoline or kerosene, and then apply it with clean high-quality or high-speed high-temperature grease. The effect of cleanliness on rolling bearing life and vibration noise is very large. But we must remind you that the fully enclosed bearings do not need to be cleaned and refueled.
Third, how to install and disassemble?
Do not directly hammer the INA bearing end face and the non-stress surface during installation. The bearing should be evenly stressed by the clamp, sleeve or other installation tools (tooling). Do not install by the rolling element transmission force. If the mounting surface is coated with oil, it will make the installation smoother. If the interference is large, the bearing should be placed in mineral oil and heated to 80~90 °C and installed as soon as possible. Strictly control the oil temperature not to exceed 100 °C to prevent the tempering effect from decreasing and affecting dimensional recovery. When disassembling is difficult, it is recommended that you use the disassembly tool to pull outward while carefully pouring hot oil onto the inner ring. The heat will cause the inner ring of the rolling bearing to expand, making it easier to fall off.
4. What are the requirements for the installation surface and installation site?
  Yes. If there are foreign objects such as iron filings, burrs, dust, etc. in the INA bearing, the bearings will generate noise and vibration during operation, and even damage the raceway and rolling elements. Therefore, before installing the bearings, you must ensure that the mounting surface and the installation environment are clean.
5. When lubricating the bearings, the more grease is applied, the better?
When lubricating INA bearings, the more grease is applied, the better. This is a common misconception. Excessive grease in the bearing and bearing chambers will cause excessive agitation of the grease, resulting in extremely high temperatures. The amount of lubricant filled in the rolling bearing is preferably 1/2 to 1/3 of the internal space of the bearing, and should be reduced to 1/3 at high speed.
6. Is the radial clearance of the bearing as small as possible?
Not all INA bearings require a minimum working clearance and you must select the appropriate clearance depending on the conditions. In GB 4604-93, the radial clearance of rolling bearings is divided into five groups - 2 groups, 0 groups, 3 groups, 4 groups, 5 groups. The clearance values ​​are from small to large, and 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and common interference fit; rolling bearings with special conditions such as high temperature, high speed, low noise and low friction should use large radial clearance; Small radial clearance should be used for precision spindles and bearings for machine tool spindles; a small amount of working clearance can be maintained for roller bearings. In addition, there is no so-called clearance for the separate type of bearing; finally, the working clearance after the bearing is installed is smaller than the original clearance before installation, because the bearing is subject to a certain load rotation, and the INA bearing fit and load are generated. The amount of elastic deformation.
After the bearing is installed, check the operation in order to check if the installation is correct. The small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor operation due to foreign matter, scratches, and indentations. The installation is poor, the torque generated by the mounting is not stable, and the torque is too large due to too small clearance, installation error, and sealing friction. Wait. If there is no abnormality, the power running can be started.
The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there is abnormal sound, INA bearing temperature change, lubricant leakage or discoloration, etc. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.
The bearing temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to directly measure the temperature of the outer ring of the bearing by using the oil hole. The rolling bearing temperature gradually increases from the start of the operation, and the temperature is usually stable after 1 to 2 hours. If the bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small INA bearing clearance, poor installation, excessive friction of the sealing device, and the like.
The rotation of the INA bearing is checked with a stethoscope, etc., and there are strong metal noise, abnormal sounds, irregular sounds, etc. to explain abnormalities. The reasons are poor lubrication, poor accuracy of the shaft or housing, bearing damage, and foreign matter intrusion.
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Use steel ball bearings - deep groove ball bearings

Deep groove ball bearings are the most common type of rolling bearings. The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of cages. The types of deep groove ball bearings are single row and double row. The single row deep groove ball bearing type code is 6, and the double row deep groove ball bearing code is 4. The utility model has the advantages of simple structure and convenient use, and is the most common and widely used type of bearing.

Deep groove ball bearings are mainly subjected to radial loads and can also withstand radial loads and axial loads. When it is only subjected to radial loads, the contact angle is zero. When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can withstand a large axial load. The deep groove ball bearing has a small friction coefficient and a high limit speed. Especially in high-speed running conditions with large axial load, deep groove ball bearings are more advantageous than thrust ball bearings.

The deep groove ball bearing has a simple structure and is easy to achieve high manufacturing precision compared with other types, so it is easy to be mass-produced in series, and the manufacturing cost is also low, and the use is extremely common. In addition to the basic type, deep groove ball bearings also have various modified structures, such as: deep groove ball bearings with dust cover, deep groove ball bearings with rubber seals, deep groove ball bearings with snap grooves, and Deep groove ball bearings with large load capacity of ball notches, double row deep groove ball bearings.

Single row deep groove ball bearing

Single row deep groove ball bearing with dust cover

Single row deep groove ball bearing with dust cover and sealing ring

Single row deep groove ball bearing with stop groove and stop ring on outer ring

Single row deep groove ball bearing

Single row deep groove ball bearing with dust cover

Single row deep groove ball bearing with sealing ring

Single row deep groove ball bearing with stop groove and stop ring on outer ring
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Double row deep groove ball bearing features

Double row deep groove ball bearing features:

Double row deep groove ball bearings are suitable for bearing configurations where the load capacity of a single row deep groove ball bearing is insufficient. For double row deep groove ball bearings with the same outer diameter and inner diameter as deep groove ball bearings, the width is larger and the load capacity is much higher than that of the single row deep groove ball bearings of the 62 and 63 series. Standard deep groove ball bearings are common radial internal clearances.

Centering error: When there is a misalignment between the inner and outer rings of a double row deep groove ball bearing, it will cause additional load. Thereby increasing the load on the steel ball and the cage and shortening the working life of the bearing. Therefore, the allowable angular error is only 2 arc minutes. Any larger angular error will result in an increase in noise.

Cage: Double row deep groove ball bearings are fitted with two glass fiber reinforced nylon 66 cages. SKF suffix is ​​TN9. Deep groove ball bearings with nylon cages can operate at temperatures up to 120 °C.

The characteristics of the cage are not affected by the lubricant used in general rolling bearings, but some synthetic oils or synthetic oil based greases and lubricants containing a large number of extreme pressure additives are excluded for high temperature applications.

Double row deep groove ball bearings are a kind of bearing arrangement, which is very suitable for the case of insufficient load capacity of single row deep groove ball bearings. When there is a misalignment between the inner and outer rings of a double row deep groove ball bearing, an additional load is caused. This phenomenon is called a centering error. With the deepening of the use of double row deep groove ball bearings, the study of double row deep groove ball bearings has attracted a lot of attention. Among them, the characteristics of double row deep groove ball bearings have become the product information that experts and users pay more attention to.

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How to repair and maintain automobile wheel bearings

How to repair car wheel bearings:

Hub bearings are important moving parts for automobiles. The hub axle bears the burden of reducing the frictional resistance during the operation of the chassis and maintaining the normal driving of the car. If the hub bearing fails, it may cause noise, bearing heat, etc., especially the front wheel is more obvious, which may lead to dangerous phenomena such as out of control. Therefore, the hub bearings must be maintained on schedule.

Inspection of wheel bearings:

(1) When checking the tightness of the hub bearing, firstly, the axle of the wheel at one end of the wheel of the car to be inspected is erected, and the vehicle is safely framed by means of a vehicle stool, a wooden cover, and the like.

(2) Turn the number of wheels to be inspected by hand to see if the rotation is stable and there is abnormal noise. If the rotation is not smooth and there is friction, the brake part is not normal; if there is no noise, the rotation is not smooth and it is loose when it is tight, indicating that the bearing part is not normal. The hub should be removed when the above abnormality occurs. For small cars, when inspecting the hub bearings, hold the upper and lower sides of the tires with both hands, and pull the tires back and forth with both hands and repeat them many times.

(3) Inspection of the brakes. Usually when inspecting the hub bearing, check the wheel brake device. If there is oil on the inside of the tire, it may be caused by oil leakage from the brake cylinder or brake hose. The cause should be identified and eliminated.

How to maintain car wheel bearings:

(1) Remove the decorative cover and dust cover of the hub shaft head;

(2) Remove the tire nut and tire. If it is a disc brake, remove the brake and use it to remove the lock ring or lock pin.

(3) Remove the hub with a special tool;

(4) scrape off the old grease in the bearing, journal and hub cavity, clean the hub bearing and journal with cleaning agent and wipe dry with cloth, and finally wipe the inner cavity of the hub with cloth;

(5) Check the hub bearing and the bearing race, and find that there are cracks, fatigue peeling and loose bearing rollers, etc., the bearing should be replaced;

Automobile wheel bearing repair and maintenance is of great significance for automotive wheel bearings. Many users have gradually discovered that product maintenance and maintenance play a key role in the use and life of the product. I believe that in the future, users will not only care about the characteristics of the product itself, but also pay attention to product maintenance and maintenance.
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