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Needle roller bearings are roller bearings with cylindrical rollers that are both thin and long relative to their diameter. This type of roller is called a needle roller. Despite its smaller cross-section, the bearing still has a high load-bearing capacity. Needle roller bearings are equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so The radial structure is compact. When the inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest. It is especially suitable for support structures with limited radial installation dimensions.

Depending on the application, a bearing without an inner ring or a needle roller and cage assembly can be selected. At this time, the journal surface and shell hole surface matching the bearing are directly used as the inner and outer rolling surfaces of the bearing to ensure the load capacity and operating performance. As with ring bearings, the hardness, machining accuracy and surface quality of the shaft or housing hole raceway surface should be similar to the raceway of the bearing ring. This kind of bearing can only bear radial load.

Features of needle roller bearing:

Needle roller bearings are equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so the radial structure is compact, and its inner diameter size and load capacity are the same as other types of bearings. , the smallest outer diameter, especially suitable for support results with limited radial installation dimensions. Depending on the application, a bearing without an inner ring or a needle roller and cage assembly can be selected. At this time, the journal surface and shell hole surface matching the bearing are directly used as the inner and outer rolling surfaces of the bearing to ensure the load capacity and operating performance. As with ring bearings, the hardness, machining accuracy and surface quality of the shaft or housing hole raceway surface should be similar to the raceway of the bearing ring. This kind of bearing can only bear radial load.

Installation of bearing:

Installation of full complement needle roller bearings is usually carried out using auxiliary sleeves. At this time, the auxiliary roller or auxiliary sleeve holds the needle roller to prevent it from falling out, and the journal lifts the needle roller with its own chamfer. As the needle roller bearing slowly moves inward on the journal, the auxiliary roller Or the auxiliary sleeve will be slowly withdrawn until it is installed in the working position.

The outer diameter of the auxiliary roller and auxiliary sleeve should be 0.1-0.3mm smaller than the shaft diameter. When installing, first apply grease to the inner surface of the bearing outer ring, place the needle roller close to the inner surface (there should be a gap when placing the last needle roller), and then put the auxiliary roller that replaces the journal or the inner ring of the bearing. Or push the auxiliary sleeve into the outer ring hole and align its end face with the end face of the installation shaft or the end face of the inner ring of the bearing installed on the shaft, and then tap with a press or hand hammer to apply pressure.

Needle roller bearings can also be installed by applying a thin layer of lubricating oil to the outer diameter of the auxiliary sleeve and inserting it into the bearing outer ring so that the auxiliary sleeve and the bearing outer ring form an annular hole, and then install the needle roller in the annular hole. After installing the needle roller, use the working shaft to push out the auxiliary sleeve.

For needle roller bearings without an inner ring or outer ring, when installing, first apply a thin layer of grease on the rolling surface of the shaft or housing hole, and place the needle rollers in close contact with the grease at the installation site. There should be a gap when placing the last needle roller. The size of the gap should be 0.5mm on the circumference of the needle roller bearing. Do not force-squeeze the last needle roller in, or install one less needle roller, because when it is hard-squeezed, the bearing will be stuck and unable to rotate; when too little is installed, the gap will be too large, which can easily cause the needle roller to break when the bearing is running. Twist and break. For needle roller bearings with only stamped outer rings, since the outer ring wall is very thin, do not hit it with a hammer for installation, but press it in with a press. Because when hammering with a hand hammer, the pressure is uneven, it is easy to cause local deformation of the outer ring of the needle roller bearing.

The RHBS2080 CNC bearing super-finishing machine equipped by our company is suitable for super-finishing three types of self-aligning inner rings, inner and outer ring raceways of tapered cylindrical roller bearings, and is suitable for super-groove processing technology for the outer diameter of support rings.

RHBS2080 CNC bearing super precision machine super precision method：

1.Through the interpolation of the x-axis and z-axis, the shape of the raceway to be processed is obtained, and there is a small vibration, and the processing surface of the workpiece is super-precision.

2.Single-station two-step super-finishing process is adopted, and the rough and fine super-stations are automatically switched during the processing. The oil stone pressurization adopts pneumatic pressurization and has automatic compensation function. When super-finishing, the oilstone is always in contact with the surface of the workpiece and the pressure remains unchanged. The structure has radial adjustment function to adapt to the super precision of workpieces of different sizes.

Working principle of bearing super precision machine:

Bearing super precision machine is also the super precision machine used on bearings. Some are also called bearing raceway super precision machines. They mainly include motors, connecting rods, pressure springs, reciprocating shafts, super precision shafts, and super precision machines. Shaft barrel, the motor shaft is connected to the eccentric sleeve with a key. There is a semicircle outside the eccentric sleeve. The front end of the connecting rod is welded and connected to the semicircular body. The other end of the connecting rod is connected to the reciprocating shaft through a linking pin and is set on the reciprocating shaft. There is a sliding sleeve and a compression spring. The other end of the reciprocating shaft is connected to a fastening sleeve. The fastening sleeve is fixed on the super-precision shaft barrel. The barrel is set on the super-precision shaft. The motor and the bearing carrier plate supporting the super-precision shaft are fixed. On the carrying roller.

Advantages of bearing superfinishing machine:

1. Can effectively reduce waviness. During the super-precision grinding process, in order to ensure that the whetstone always acts on the wave crest and does not contact the wave trough, the arc of the contact between the whetstone and the workpiece ≥ the wavelength of the waviness of the workpiece surface. In this way, the contact pressure of the wave crest is relatively large, and the convex peak becomes smaller. are cut away, thereby reducing waviness.
2. Improve the groove error of ball bearing raceways. Super precision grinding can effectively improve the groove shape error of the raceway by about 30%.
3. It can generate compressive stress on the surface being ultra-finishing. During the super-fine grinding process, cold plastic deformation mainly occurs, resulting in residual compressive stress on the surface of the workpiece after super-fine grinding.
4. It can increase the contact area of the working surface of the ferrule. After super fine grinding, the contact support area of the working surface of the ferrule can be increased from 15% to 40% after grinding to 80% to 95%.

Our staff can use the RHBS2080 CNC bearing super precision machine to produce bearing products with higher precision and higher performance, so that the product performance is in the best state, thereby better meeting customer needs.

Hub bearings and bearing supports are usually installed between the wheel and the axle.

A wheel bearing is a spherical rolling bearing, usually composed of an inner ring, an outer ring, balls and a cage. They are mounted between the wheel and the axle to support

the rotation of the wheel. Hub bearings usually need to bear a lot of load and friction during driving, so they must be maintained and replaced frequently.

A bearing mount is a bracket that holds a bearing in place and is usually mounted on an axle. They can help stabilize hub bearings and make them easier to install and

maintain. Bearing supports are usually made of cast iron Or made of aluminum, it has enough strength and durability to withstand the vibration and shock during the running of

the vehicle.

In general, the bearings between the wheels and axles are an important part of the normal operation of the vehicle, and their quality and reliability directly affect the

safety and performance of the vehicle. Therefore, in choosing When selecting and replacing hub bearings and bearing supports, high-quality products must be selected, and they

must be installed and maintained correctly in accordance with the manufacturer’s instructions.

So what does a bad wheel bearing sound like？

1. Symptoms of broken front wheel bearings: After the front wheel bearings of the car are damaged, there will be continuous friction and collision sounds from the corresponding positions of the chassis wheels when driving;
2. It will cause abnormal friction between the brake hub and the brake pad, which will greatly increase the driving resistance. In severe cases, it will also damage the mechanism of the wheel and cause the wheel hub to fall off.
3. Symptoms of broken rear wheel bearings: The wheels will shake when the car is running, the vibration of the whole vehicle will increase, and the bearings will be damaged, there will be abnormal noises, and the rolling will not be smooth, resulting in power failure. The biggest impact of this is that the vibration of the car body will intensify, and there will be abnormal noises.

If you find that your car has the above problems, it is recommended that you go to the car shop for repairs in time to avoid accidents！

The EAC Certificate of Conformity (EACCOc) of the Eurasian Economic Union (EAEU) is the official certificate certifying that a product complies with the harmonized technical regulations of the EAEU Eurasian Union member states. Products that have obtained the EAC certificate of the Eurasian Economic Union can be freely circulated and sold in the entire customs union area of ​​the member states of the Eurasian Economic Union.

Before the establishment of the Customs Union, the three countries of Russia, Belarus and Kazakhstan had their own independent certification systems, because their certifications were all managed by the national bureaus of standards of each country. The Russian abbreviation is GOST, so the predecessor of EAC certification is the GOST certification of various countries, and Russia is called GOST-R certification ( R stands for Russia), Belarus is called GOST-B certification (B stands for Belarus), Kazakhstan is called GOST-K certification (K stands for Kazakhstan).

After the unified certification of the three countries is EAC, because there are too many regulated products, the demand for certification has become great. Therefore, EAC certification is a certification that all enterprises entering Russia and its surrounding markets must face, and enterprises must understand. Of course, if the company insists on certification in a single country, such as Russia’s GOST-R certification, this is also possible, but it is not cost-effective and cannot be sold to other countries.

Our company has handled the EAC certificate, and our bearing products meet the TPTC 010/2011 standard！It will be more convenient for friends from Russia, Belarus, Kazakhstan, Armenia and Kyrgyzstan to buy our bearing products!

Luozhou Group has made new achievements in the field of bearings!

On July 19, 2023, the world’s first 16-megawatt ultra-large-capacity offshore wind turbine jointly developed by Three Gorges Corporation and Goldwind was successfully connected to the grid for power generation at the Fujian Offshore Wind Farm, marking the development, manufacture and operation of large-capacity offshore wind turbines in my country. The ability has reached a new level and reached the international leading level.

In July 2023, the hoisting of the world’s first 16MW offshore wind turbine was completed to realize grid-connected power generation.

On May 13, 2023, the world’s first tandem double-turbine wind turbine “Sairui” independently developed by Huaneng successfully completed hoisting at Huaneng Jilin Tongyu Wind Farm and entered the demonstration stage of complete machine operation! On June 26, “Serui” was successfully connected to the grid.

“Sairui” double-wind turbine wind turbine unit, with a single unit capacity of 2.7MW, belongs to the national key research and development plan “Key Technology Research of New High-efficiency Wind Energy Conversion Devices” project, independently developed by China Huaneng Group Clean Energy Technology Research Institute Co., Ltd., Huaneng Jilin Branch The company organizes hoisting. Compared with traditional wind turbines, the “Sairui” uses the front and rear wind wheels to capture wind energy, and the length of the blades is shortened by nearly half under the same power. It is understood that the cost of the double wind turbine unit is more than 10% lower than that of the traditional single wind turbine unit, and the efficiency of the single unit is increased by 15%.

The precision of the main bearing product developed and designed by Luozhou has been highly recognized by customers. During the installation and debugging stages, the product performance is excellent.