Cylindrical Roller Bearings
Linqing Tuocheng Bearing Co., Ltd： You Professional Cylindrical Roller Bearings Manufacturer!
Linqing Tuocheng Bearing Co., Ltd. was established in June 2002 and is located in Panzhuang Town, Linqing City, Liaocheng City, Shandong Province. It has been committed to the research and development, production, sales and service of high-quality bearings. Each bearing produced by the company is developed from the requirements of safety, high temperature resistance and wear resistance. The company's products are exported to more than a dozen countries such as Russia, Lithuania, Iran, and Dubai.
Rich Product Variety
Our company can produce self-aligning ball bearings, Spherical Roller Bearing CA Series, Spherical Roller Bearing MA Series, Spherical Roller CC Series and Spherical Roller Bearing MB Series
Wide Range of Product Uses
Our tapered roller bearings are often used in applications where there is a requirement for heavy-duty operation. These include earth moving equipment, mining machines, industrial machinery, construction vehicles, marine vessels, wind turbines, and so on.
Quality Guaranteed
Our tapered roller bearings are rigorously tested to ensure durability and long-lasting performance.With our advanced technology and manufacturing equipment,They are developed from several safety, high temperature resistance, wear resistance and other requirements.
Leading Service
We have many years of industry experience and a comprehensive production management, quality supervision, sales service operation system. Whether you want to purchase spontaneous tiles or reflective paint, simply send your requirements via email and we can customize the product for you.
Related Product Introduction
Product Features In order to obtain low friction torque, high rigidity, and good rotation accuracy of the bearing, steel balls with small outer diameters are used. The use of hollow shafts ensures light weight and space for wiring.
Product Features In order to obtain low friction torque, high rigidity, and good rotation accuracy of the bearing, steel balls with small outer diameters are used. The use of hollow shafts ensures light weight and space for wiring.
In the past 40 years, new mechanical parts have gradually emerged around the world. It consists of inner and outer rings, rolling elements, etc. The slewing bearings produced in my country are mainly introduced by the Tianjin Construction Machinery Research Institute designated by the Ministry of Machinery Industry in the early 1980s.
The outer ring of the roller bearing adopts a full complement cylindrical roller bearing with a thick outer ring wall. The outer diameter surface of the roller has a cylindrical shape and an arc shape, which can be designed to match the raceway surface according to the application. With this outer ring, the rollers can roll directly on the raceway and can withstand heavier loads and shock loads.
According to whether the ring has ribs or not, it can be divided into single row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double row cylindrical roller bearings such as NNU and NN. The bearing is a structure in which the inner ring and the outer ring can be separated.
Cylindrical rollers and raceways are linear contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the rib of the ring is small, which is suitable for high-speed rotation.
When the outer ring is particularly thick, it is installed in groups on the stationary shaft to become the bearing of the support roller.
According to the force, it is divided into one-way thrust ball bearings and two-way thrust ball bearings. One-way thrust ball bearing can bear one-way axial load. Two-way thrust ball bearing can bear two-way axial load, in which the shaft ring is matched with the shaft.
What is Cylindrical Roller Bearings
Cylindrical roller bearings have a simple structure of cylindrical rollers in linear contact with the raceways. They offer high load capacity under primarily radial loads. Due to the large number of rollers, this type of bearing can withstand extremely heavy radial loads and is very suitable for high-speed rolling mill applications.
Advantages of Cylindrical Roller Bearings
Excellent Sealing
Contact seals significantly reduce the entry of water and foreign matter. It can provide additional sealing in the adjacent structure. Since the bearing is not sealed, the bearing position must be sealed in the adjacent structure. This effectively prevents moisture and contaminants from entering the bearing and also prevents lubricant from escaping the bearing.
High Load Capacity
These bearings can take the significant radial and thrust loads present in crane sheaves. It has higher fatigue and impact resistance than ball bearings.
Corrosion-resistant
A phosphate coating improves resistance to rust and corrosion. Accommodating axial displacement (except bearings with flanges on both the inner and outer rings), they offer high rigidity, low friction and long service life. Cylindrical roller bearings are also available in sealed or split designs. In sealed bearings, the rollers are protected against contamination, water and dust, keeping the lubricant in while excluding contamination. This results in lower friction and longer service life.
Easy Grease Replenishment
Lubrication holes supplied in the inner ring allow for grease in sealed types to be easily refilled and replaced. Cylindrical roller bearings are separable bearings. Since the inner and outer rings can be installed separately, the installation process is generally simpler, especially for bearings with interference fits on both the inner and outer rings.
Fewer Mounting Parts
Equipped with a locating snap ring, using these specialized bearings reduces the number of surrounding components, allowing for a more economical sheave structure.
Type of Cylindrical Roller Bearings
Single Row Cylindrical Roller Bearings
The outer ring of the N-type bearing has no ribs, and there are ribs on both sides of the inner ring. Displacement in both axial directions between the shaft and the bearing housing can be allowed. The NU type bearing has ribs on both sides of the outer ring and no ribs on the inner ring. It is also possible to allow displacement of the shaft relative to the bearing housing in both axial directions. Therefore, this type of structure is suitable for use as a loose end bearing.
NJ type bearings have ribs on both sides of the outer ring, and ribs on one side of the inner ring. Can withstand a certain amount of unidirectional axial load. NF type has ribs on one side of the outer ring and ribs on both sides of the inner ring. It can also bear a certain amount of unidirectional axial load. Therefore, this type of structure is suitable for use as a unidirectional axial locating bearing.
NUP type bearings have ribs on both sides of the outer ring, a (fixed) single rib on one side of the inner ring, and a separable flat rib on the other side. Can withstand a certain amount of bidirectional axial load.
The bearing outer ring of the NFP type has a (fixed) single rib on one side, and a separable flat rib on the other side, with ribs on both sides of the inner ring. It can also withstand a certain amount of bidirectional axial load. This type of structural bearing can limit the displacement of the shaft relative to the bearing seat in both axial directions. Therefore, it is suitable for use as a fixed end bearing.
The NH type bearing is the combination of the NJ type bearing and the HJ type inclined retaining ring. Because the inner ring of the NUP type bearing is short, and the flat retaining ring is not fixed, it is inconvenient to use, while the NH type bearing can use the width of the entire inner ring of the NJ type bearing to maintain a tighter fit with the shaft. Moreover, the NH type bearing is more convenient to install and disassemble.
NH type bearings can limit the displacement of the shaft relative to the bearing seat in both axial directions. Therefore, it is suitable for use as a fixed end bearing.
Double row cylindrical roller bearings have two structures: cylindrical inner hole and conical inner hole (bearing rear code plus K). This type of bearing has the advantages of compact structure, high rigidity, large bearing capacity, and small deformation after being loaded, and is especially suitable for the support of machine tool spindles. The conical inner hole can also play the role of micro-adjustment of the clearance, and can simplify the structure of the positioning device and facilitate installation and disassembly. Commonly used double row cylindrical roller bearings have the following forms:
The outer ring of the NN type bearing has no ribs, and there are ribs on both sides of the inner ring and a middle rib in the middle. Displacement in two directions in the axial direction between the shaft and the bearing housing can be allowed.
The outer ring of the NNU bearing has ribs on both sides and a middle rib in the middle, and the inner ring has no ribs. Displacement in two directions in the axial direction between the shaft and the bearing housing can be allowed. Therefore, this type of structure is suitable for the moving end bearing. The cages of this type of bearings are mostly car-made solid cages.
NNF type bearing is a double row full complement cylindrical roller bearing. The bearing consists of one outer ring with middle rib and two inner rings with double rib. The rollers are guided by the ribs of the inner ring, and the two inner rings are held together by a clamping ring. In addition to the large radial load and axial load, the structure can also bear the overturning moment, so it is often used as a fixed end bearing.
Installation of Cylindrical Roller Bearings
Cold mounting
If the fit is not too tight, small bearings can be driven into position by applying light hammer blows to a bearing fitting tool. The tool enables the mounting force to be applied centrally.
If a bearing has to be pressed onto the shaft and into the housing bore at the same time, the mounting force must be applied equally to both rings and the abutment surfaces of the mounting tool must lie in the same plane.
With self-aligning bearings, the use of an intermediate mounting ring prevents the outer ring from tilting and swivelling when the bearing and shaft assembly is introduced into the housing bore. The balls of larger self-aligning ball bearings in the 12 and 13 series protrude from the sides of the bearing, therefore the mounting ring must have a recess.
Hot mounting
It is generally not possible to mount larger bearings without heating either the bearing or the housing, as the force required to mount a bearing increases considerably with increasing bearing size.
The requisite difference in temperature between the bearing ring and shaft or housing depends on the degree of interference and the diameter of the bearing seat. Generally, open bearings must not be heated to more than 120°C (250°F). SKF does not recommend heating bearings capped with seals or shields above 80°C (175°F). However, if higher temperatures are necessary, make sure that the temperature does not exceed the permissible temperature of either the seal or grease, whichever is lowest.
When heating bearings, local overheating must be avoided. To heat bearings evenly and reliably, we recommends using electric induction heaters . If hotplates are used, the bearing must be turned over a number of times. The seals on sealed bearings should never contact the heating plate directly. Place a ring between the plate and bearing.
Maintenance of Cylindrical Roller Bearings
Disassemble
The disassembly of the bearing is for regular maintenance, and it is performed when the bearing is replaced. After disassembly, if you continue to use it, or when you need to check the condition of the bearing, the disassembly should be carried out as carefully as the installation. Be careful not to damage the parts of the bearing, especially the disassembly of the interference fit bearing, which is difficult to operate.
It is also very important to design and manufacture disassembly tools according to needs. When disassembling, study the disassembly method and sequence according to the drawings, and investigate the matching conditions of the bearing to ensure that the disassembly operation is foolproof.
Disassembly of the outer ring For the outer ring with interference fit, set several screws for extruding the outer ring on the circumference of the outer ring in advance, and tighten the screws evenly while disassembling. These screw holes are usually covered with blind plugs and separable bearings such as tapered roller bearings. Several cuts are set on the blocking shoulder of the shell. Use a pad to remove it with a press or gently tap it.
The disassembly of the inner ring can be the easiest to pull out with a press. At this time, pay attention to let the inner ring bear its pulling force. Furthermore, the pull-out clamps shown are mostly used, and no matter what kind of clamps, they must be firmly clamped to the side of the inner ring. For this reason, it is necessary to consider the size of the shoulder of the shaft, or study the processing of the upper groove at the shoulder in order to use the drawing fixture.
The oil pressure method is adopted for the inner ring disassembly of large bearings. Oil pressure is applied through the oil hole provided in the bearing to make it easy to draw. For bearings with a large width, the hydraulic method and the drawing fixture are used together for disassembly.
Induction heating can be used to disassemble the inner ring of cylindrical roller bearings. The method of drawing after heating the part in a short time to expand the inner ring. Where a large number of these bearing inner rings need to be installed, induction heating is also used.
Cleaning
When disassembling the bearing for inspection, first make a record of the appearance with photography or other methods. In addition, confirm the amount of remaining lubricant and sample the lubricant before cleaning the bearing. The cleaning of the bearing is divided into rough cleaning and fine cleaning, and a metal grid can be placed at the bottom of the container in use.For rough washing, use a brush to remove grease or adhesions in oil. If the bearing is rotated in oil at this time, be careful that the rolling surface may be damaged by foreign matter.
When performing fine washing, slowly rotate the bearing in oil, and perform it carefully. Commonly used cleaning agents are neutral non-water-containing diesel or kerosene, and sometimes warm lye etc. are used as needed. No matter which cleaning agent is used, it must be filtered frequently to keep it clean.
After cleaning, immediately apply anti-rust oil or anti-rust grease on the bearing.
Application of Cylindrical Roller Bearings
Agricultural
Cylindrical roller bearings can be used in linkage and pivot points, hinges, pedals, steering and suspension assemblies, king pins, hydraulic cylinders, grain head and corn head reel systems, GGB bearings for tractors & farm equipment, chaff discharge, auger heads, doors and chutes and boom pivots.
Air Conditioning Compressors
Scroll compressors are used to compress refrigerant in air conditioners and offer many advantages over rotary compressors, especially when cooling large spaces. This compressor introduces cylindrical roller bearings to determine the plain bearing solution for the main scroll bearing and the orbiting scroll bearing.
The bearings for this application must have very good friction properties, heat resistance, durability, and wear resistance. Since the compressor is a closed system, the bearings cannot be accessed for maintenance. In addition, any failure of the bearings can lead to catastrophic failure of the entire air conditioning unit.
Automotive Industry
Large and medium-sized motors, locomotives, machine tool spindles, internal combustion engines, generators, gas turbines, reduction gearboxes, rolling mills, vibrating screens, and lifting and transportation machinery, etc.
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