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INA Bearing

January 16, 2020

INA Bearing

 
INA bearing is a kind of bearing adopting thin grease and oil mist lubrication method, and it is an important component in contemporary machinery and equipment. The main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its accuracy. It is mainly divided into cylindrical roller bearings, self-aligning ball bearings and so on.
 
Chinese name
INA Bearing
Adopt
Dilute grease and oil mist lubrication mode
influences
Life and friction, wear, temperature
Features
Related to poor lubrication

Lubrication method

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General working INA bearings use thin grease and oil mist lubrication methods. These lubrication methods have their own characteristics, but to meet the working requirements of modern high-speed, high-load work roll bearings, oil vapor lubrication can be considered more suitable.
Lubrication has an important impact on the fatigue life and friction, wear, temperature, vibration, etc. of INA bearings. The biggest outstanding feature of ceramic bearings is that they cannot work without normal lubrication. Analysis of the causes of bearing damage shows that about 40% of bearing damage is related to poor lubrication. Therefore, good lubrication of INA bearings is an effective measure to reduce bearing friction and wear. In addition, the lubrication of bearings is also affected by heat dissipation, rust prevention, sealing, and shock mitigation.
After using oil-at-a-time lubrication, the actual working life of the work roll bearing has been significantly improved, and the wear and damage of the rolling work surface has been greatly improved compared with grease lubrication. When the bearing reaches 1 / 3-1 / 4 of its service life, it must be thoroughly cleaned and the internal clearance of the INA bearing must be measured. When the internal clearance of the bearing is greater than twice the original clearance, it should be adjusted. When re-installing the bearings after inspection, the load-bearing area should be replaced (that is, the outer ring is rotated 90 degrees and then matched with the bearing seat)
Under high-speed and high-temperature conditions, the INA bearing combination position and clearance adjustment scheme can not be used when grease lubrication is not suitable. Through the circulation of lubricating oil, a lot of heat can be taken away. Viscosity is an important characteristic of lubricating oil. The size of the viscosity directly affects the fluidity of the lubricating oil and the thickness of the oil film formed between the friction surfaces. The viscosity of the lubricating oil at the bearing operating temperature is generally 12-15 cst. The higher the speed, the lower the viscosity should be, and the heavier the load, the higher the viscosity should be. Commonly used lubricants are mechanical oil, high-speed mechanical oil, turbine oil, compressor oil, transformer oil, cylinder oil, etc.
INA bearings have increased internal clearance due to wear during operation. Increasing the bearing clearance will cause the bearing to reduce the load bearing area and increase the operating noise and other unfavorable factors. Therefore, when considering the reuse standard of bearing clearance, the bearing with increased clearance should be used first according to the host operating conditions.

installation steps

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1. Before installing the bearing on the shaft, you must first remove the fixing pin of the bearing jacket, and at the same time, polish the surface of the journal to smooth and clean, and apply oil to prevent rust and lubrication at the journal (allowing the bearing to rotate slightly on the shaft).
2. Lubricate the bearing seat and bearing mating surface, and install the INA bearing in the bearing seat. Then put the assembled bearing on the shaft together with the bearing seat. Push to the required position for installation.
3.Do not tighten the bolts that fix the bearing block first, and make the bearing jacket rotate in the bearing block. At the same time, install the bearing and seat on the other end of the same shaft, rotate the shaft a few times, and let the INA bearing itself correct the position automatically. Then tighten the bearing seat bolts.
4.Install an eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the bearing inner sleeve, and tightened by hand in the direction of shaft rotation. Then insert the small iron rod or press against the counterbore on the eccentric sleeve. Use the hammer to tap the small iron rod in the rotation direction of the shaft. Make the eccentric sleeve securely installed, and finally tighten the hex screw on the eccentric sleeve.

Bearing classification

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INA deep groove ball bearings are mainly used to support pure radial loads, and can also support radial and axial loads at the same time. When it is only subjected to pure 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 bear a large axial load. Deep groove ball bearings have very low friction coefficients and high limiting speeds. Especially under high-speed operating conditions with large axial loads, deep groove ball bearings are superior to thrust ball bearings. Deep groove ball bearings are the most representative rolling bearings and have a wide range of uses. It is suitable for high-speed and even high-speed operation, and it is very durable and does not require frequent maintenance. This type of bearing has a small friction coefficient, high limiting speed, simple structure, low manufacturing cost, and easy to achieve high manufacturing accuracy. The size range and form are various. It is used in precision instruments, low-noise motors, automobiles, motorcycles, and general machinery. It mainly bears radial load and can also bear a certain amount of axial load.
When a larger radial clearance is selected, the axial bearing capacity increases, and the contact angle is zero when subjected to pure radial force. When there is an axial force, the contact angle is greater than zero. Generally, stamped wave-shaped cages, solid cages made of cars, and nylon frames are sometimes used.
After the deep groove ball bearing is installed on the shaft, the axial displacement of the shaft or the housing can be limited in the axial clearance of the bearing, so it can be axially positioned in both directions. In addition, this type of bearing also has a certain self-aligning ability. When it is inclined 2 ′ to 10 ′ relative to the housing hole, it can still work normally, but it has a certain impact on the bearing life. Deep groove ball bearing cages are mostly steel stamped corrugated cages, and large bearings are mostly made of metal solid cages.
INA angular contact ball bearings
Angular contact ball bearings:
(Angular Contact Ball Bearings) can support both radial and axial loads. Can work at higher speeds. The larger the contact angle, the higher the axial load capacity. High-precision and high-speed bearings usually adopt a contact angle of 15 degrees. Under axial force, the contact angle will increase.
Single-row angular contact ball bearings: machine tool spindles, high-frequency motors, gas turbines, centrifugal separators, small car front wheels, differential pinion shafts
Double-row angular contact ball bearings: oil pumps, roots blowers, air compressors, various transmissions, fuel injection pumps, printing machinery
INA cylindrical roller bearings
Cylindrical rollers and raceways are linear contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the collar of the ferrule is small, which is suitable for high-speed rotation. Depending on whether the ferrule has flanges, it can be divided into single-row bearings such as NU, NJ, NUP, N, NF, and double-row bearings such as NNU, NN. The bearing has a separable inner and outer ring structure. Cylindrical roller bearings with no ribs on the inner or outer ring, the inner and outer rings can move relatively in the axial direction, so they can be used as free-end bearings. Cylindrical roller bearings with double ribs on one side of the inner ring and outer ring and a single rib on the other side of the ring can withstand a certain degree of axial load in one direction. Steel stamped cages or copper alloy car cages are generally used. However, some use polyamide molding cages.
Cylindrical roller bearings are suitable for large and medium-sized electric motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, speed reducers, rolling mills, vibrating screens, and lifting and transportation machinery. product features
Cylindrical rollers are in linear contact with the raceway and have a large radial load capacity. They are suitable for both heavy and shock loads and high-speed rotation.
Cylindrical roller bearing raceways and rolling bodies have improved bearing geometry after improved design. The new structural design of ribs and roller end faces not only improves the axial bearing capacity of the bearings, but also improves the roller end faces. The lubricating conditions in the contact area with the ribs improve the serviceability of the bearing.
These bearings are mainly used in medium and large electric motors, generators, internal combustion engines, gas turbines, machine tool spindles, speed reducers, loading and unloading machinery, and various industrial machinery.
INA bearing manufacturer
Bearings are food for machinery and equipment, and are the driving force for their operation. Aiken's sufficient spot inventory, effective inventory management system and fast transportation guarantee can maximize customer convenience. The sales industry involves metallurgy, petrochemical, power, mining machinery, construction machinery, highway engineering machinery, steel, railway, Printing, food, medicine, chemical and other fields.
INA angular contact ball bearings
Single row angular contact ball bearings
Single row angular contact ball bearings
Single-row angular contact ball bearings are self-retaining units with solid inner and outer rings, and balls and nylon, steel or brass cage components. The inner and outer ring raceways are offset from each other in the axial direction of the bearing. There are open and sealed bearings. Their self-aligning ability is very small.
Many sizes of angular contact ball bearings are designed by X-life. These bearings are shown in the dimension table. X-life quality bearings have improved raceway shapes and optimized surfaces. This makes the bearing's fatigue limit load significantly improved. In the revised service life calculation, the service life value has been increased by more than 50%. Therefore, in certain applications, smaller bearings can be used if necessary.
Double-row angular contact ball bearings
Double-row angular contact ball bearings are units composed of solid inner and outer rings, balls and cages made of polyamide, stamped steel sheet, or brass. They are similar in structure to a pair of single-row angular contact ball bearings arranged in an O-shape, but with a more compact structure. They have different contact angles and bearing ring designs.
The bearings can be open and sealed. Due to the production technology used, the open bearing outer ring has cutting grooves for sealing or dust cover. Sealed bearings require no maintenance and are especially suitable for economic bearing applications. Angular contact ball bearings have a small self-aligning range.
INA Self-aligning ball bearings
Self-adjusting ball bearing is a double-row self-retaining unit composed of a solid outer ring with a concave groove plate, an inner ring with a cylindrical or conical hole, a ball and a cage assembly. These bearings can be either open or sealed.
INA bearing units and bearing housings
INA bearing unit
INA housings and bearing bearing assemblies have been successfully used in machinery, plants and other equipment and have stood the test.
INA bearing housing is generally made of gray cast iron material. Cast steel and spheroidal graphite cast iron housings are also available on request. Because bearings are usually lubricated with lubricating oil, the long-term lubricating effect can be maintained after the first grease filling, so most bearing housings do not have lubrication holes. However, the bearing housing is marked with a lubrication hole that can be drilled if required. When relubricating, make sure that excess oil can escape.
The housing bore is usually machined to allow the bearing to move in it and can be used as a non-locating bearing. Locating bearing arrangements can be achieved by embedding locating rings, if listed in the table. The positioning ring must be ordered specifically. Housings without locating rings are used in non-locating bearing INA bearing unit models (L) or locating bearing models (F).
All raw exterior surfaces and housing parts of the INA housing are universal paint coatings (color RAL 7031, blue ash). This paint can be coated with all resins, polyurethanes, acrylics, epoxy resins, chlorinated rubber, cellulose and acid Hardened hammered gray enamel finish. Corrosion protection on the inner and outer surfaces after processing can be easily removed.
Depending on the operating conditions, contact seals, non-contact seals, and combinations thereof can be used to seal the bearing housing.
INA Precision Machinery Products
INA Precision Machinery Products
Linear bearings are ideal for transmitting motion. For rotary bearings, the design of the distance should consider whether it is rolling or sliding during operation. The requirements for linear components vary by application area. In the conveying and loading system, speed and precision are required at the same time. For example, measuring instruments emphasize precision and rigidity. Finding the right linear guidance system for a particular application, complete products and careful consultation are important. INA provides: a wide range of linear products and professional services: a step closer, the accessories that are properly matched to a certain application will optimize the comprehensive standard range of the guide rail system.
The design characteristics of each linear product make it particularly suitable for a particular linear arrangement. In general, the selection and application principle of the guide rail system can only be reduced to one point, because you need to consider more and more factors and weigh the advantages and disadvantages. In addition to load, acceleration, speed, and travel, factors such as temperature, lubrication, vibration, installation, and maintenance need to be considered.
Linear rolling bearing
Linear rolling bearing
Linear rolling bearings include linear guidance systems, roller guidance systems, optical axis and linear ball bearing guidance systems, flat cage guidance systems, linear recirculating ball or roller guidance systems, and drive units (actuators and tables). In addition, INA also manufactures special miniature guidance systems for small design applications. For example, mechatronics and precision industry applications. These compact components have a very large load carrying capacity, low friction, high rigidity, and a choice of cage and cycle types. Due to their compact design, they can replace solutions that require a lot of space.
These guidance systems include a guide / slider unit, a linear ball bearing / optical axis system or a guide unit with a roller or ball-flat cage between them. The drive unit is a single or multi-axis complete system with a mechanical guidance system, a motor and a controller that matches the system.
The linear guidance system is a ready-to-install positioning guide, mainly without stroke limitation. The flat cage guide system and linear guide pair are used in the case of limited stroke due to the cage. The slider supports forces from all directions-except for the direction of motion-and moments around all axes. The optical axis guidance system with linear ball bearings is suitable for supporting loads from two directions and can compensate for static deviations of the optical axis. Since high rigidity and high precision are often required during operation, most units are preloaded or can be preloaded when installed. Due to different accuracy and preload levels, it can meet different guidance and positioning requirements in the application.
In order to determine the size of the guidance system, the first consideration is the level and type of load and the requirements for slider life and slider reliability. In general, roller sliders can withstand larger loads than ball-type sliders with the same external dimensions. Ball guidance systems are typically used for small to medium loads and high dynamic movements, and roller guidance systems are used for high loads. If high loads are to be supported, flat cages and recirculating roller guidance systems are also suitable.
Linear plain bearings
Linear plain bearings
In rolling bearings, the bearing ring is separated by a rolling unit (rolling element). In a sliding guide system, the movable part slides on a static guide or shaft. Depending on the type of track system, the sliding layer is on movable or rigid components. The lubricating oil is embedded in the sliding layer for the purpose of lubrication.
Linear plain bearings are linear locating bearings with infinite stroke length. These linear guidance systems may be miniature sliding guidance systems, Permaglide linear plain bearings and Permaglide linear plain bearing units, as well as flat guidance systems. The miniature slide guidance system includes a rail / slider system and a maintenance-free sliding layer. The Permaglide linear plain bearing unit is a low-maintenance Permaglide bushing mounted in a light metal ring. The flat guide system is a guide system with a sliding layer on the guide rail with very low maintenance requirements.
The sliding guidance system has almost no wear, and has a high static load capacity. It is insensitive to impact loads and pollution, has low noise, and has no stick-slip phenomenon. The maintenance-free sliding guidance system does not require lubrication, low maintenance requires materials, and good extreme operating characteristics. Due to its multi-purpose characteristics, sliding guidance systems are used in many fields, especially where maintenance-free or low-maintenance is required, where there may be insufficient lubricant, or where lubricants cannot be used.
The service life of the linear sliding guidance system depends on the load, sliding speed, temperature and operating cycle. There are additional limiting factors, including contamination, dry running corrosion, or aging of lubricants due to insufficient lubrication. Therefore, the basic rating life is for reference only.
Many external influences on linear plain bearings cannot be estimated. Therefore, the service life of the guidance system tested under operating conditions is the most accurate and reliable.

Application area

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The products of INA Bearings in Germany include: agricultural machinery industry, construction industry, hydraulic and wind engineering industry, engineering machinery industry, machine tool and manufacturing machinery industry, material processing and packaging industry, port engineering industry, power tool industry, transmission industry, Semiconductor industry, pump and fan industry, industrial robot and automation industry, rubber, plastic and chemical industry, textile industry, tractor industry, woodworking machinery industry, etc. In these industries, German INA bearings have been widely used.