Six precautions for selecting NTN imported bearing
Six precautions for selecting NTN imported bearing
2022年4月25日
Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
Measures to Prevent Overheating and Burning of IKO Rod End Joint Bearing
2022年4月26日

Limit speed problem and noise treatment method of SKF Bearing

  • Raceway sound of imported bearing and its control method raceway sound is a smooth and continuous sound made by the rolling body rolling on the raceway surface when the shaft is running. It is a unique basic sound that will occur in all rolling bearings. The general bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz.
  • Its main frequency does not change with the speed, but its total sound pressure level increases with the speed. For the bearing with loud raceway sound, the sound pressure level of raceway sound decreases with the increase of viscosity; The sound pressure level of SKF Bearing with low raceway noise changes from decrease to increase when the viscosity increases to more than 20mm2 / s. Limit speed problem and noise treatment method of SKF Bearing
  • The greater the rigidity of the bearing pedestal, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and dominant frequency of raceway sound will increase sharply with the reduction of radial clearance. The methods to control the sound of raceway are: select low-noise bearings, that is, bearings with small waviness, and carefully select the service conditions. Raceway noise often affects the noise of the whole machinery. Reducing raceway noise can reduce the noise of the whole machinery.Limit speed problem and noise treatment method of SKF Bearing

The general bearing sound is the sound of raceway SKF Bearing 

  • Impact sound of rolling element and its control method when the ball bearing or cylindrical roller bearing of larger model runs at low speed under pure radial load, due to the small centrifugal force of the rolling element, the rolling element in the non load area will impact the cage or raceway and make noise. As the speed increases, the sound disappears. The control methods of impact sound of rolling elements are: appropriately reduce the radial clearance, and use the bearing of cage with reasonable structure and flexible material.Limit speed problem and noise treatment method of SKF Bearing
  • Rolling sound of bearing and its control method rolling sound is the harsh metal friction sound that can occur in cylindrical roller bearings on all occasions. It mostly occurs in grease lubricated larger SKF bearings, but it is more likely to occur in greases with degraded base oil performance, which hardly occurs in oil lubrication. In addition, it is easy to occur in winter. Limit speed problem and noise treatment method of SKF Bearing
  • When bearing pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a specific speed range with different models and sizes, both continuously and intermittently. Special processing methods for the outer ring raceway can prevent the occurrence of rolling sound.Limit speed problem and noise treatment method of SKF Bearing
  •  If necessary, this kind of bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, the lubricating grease with excellent performance can be used and the rigidity of the parts matched with the bearing can be improved.Limit speed problem and noise treatment method of SKF Bearing
Limit speed problem and noise treatment method of SKF Bearing
  • The amount of grease filled in SKF Bearing is suitable to fill 1 / 2-1 / 3 of the internal space of the bearing. It should be reduced to 1 / 3 at high speed. Too much grease will increase the temperature rise.   When selecting the working temperature of the lubricating grease, the main indicators should be the drop point, oxidation stability and low-temperature performance. Limit speed problem and noise treatment method of SKF Bearing
  • The drop point can generally be used to evaluate the high-temperature performance, and the actual working temperature of the bearing should be 10-20 ℃ lower than the drop point. The service temperature of synthetic grease shall be 20-30 ℃ lower than the dropping point.Limit speed problem and noise treatment method of SKF Bearing

When selecting SKF Bearing load, select grease with small penetration for heavy load. 

  • When working under high pressure, in addition to small penetration, it also has high oil film strength and extreme pressure performance.Limit speed problem and noise treatment method of SKF Bearing
  • When choosing grease for environmental conditions, calcium based grease is not easy to dissolve in water and is suitable for dry and less moisture environment. Oil lubrication
  • Under high-speed and high-temperature conditions, oil lubrication can be used when grease lubrication is no longer suitable. Lubricating oil circulation can take away a lot of heat. Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces.Limit speed problem and noise treatment method of SKF Bearing
  •  The viscosity of lubricating oil at bearing working temperature is generally 12-15cst. The higher the rotating speed, the lower the viscosity should be selected, and the heavier the load, the higher the viscosity should be selected. Common lubricating oils include machine oil, high-speed machine oil, turbine oil, compressor oil, transformer oil, cylinder oil, etc. Oil lubrication methods include:Limit speed problem and noise treatment method of SKF Bearing
  • Oil bath lubrication is an ordinary lubrication method, which is suitable for low and medium speed bearing lubrication. Part of the bearing is immersed in the groove, and the lubricating oil is brought up by the rotating SKF Bearing parts and then flows back to the oil groove. The oil level should be slightly lower than the center of the low rolling element.Limit speed problem and noise treatment method of SKF Bearing
  • Oil dripping lubrication is suitable for bearing parts requiring quantitative supply of lubricating oil. The amount of oil dripping is generally one drop every 3-8 seconds. Too much oil will increase the bearing temperature.
  • The circulating oil lubricating oil pump transmits the filtered oil to the bearing parts, and the lubricating oil behind the bearing is used after filtering and cooling. Circulating oil can take away some heat to cool the bearing, so this method is suitable for bearing parts with high speed.Limit speed problem and noise treatment method of SKF Bearing
  • Spray drying is made by mixing the dry compressed air with the spray oil and the lubricating oil. The air flow in the jet bearing can effectively cool the SKF bearing and prevent impurities from entering. This method is suitable for lubrication of high speed and high temperature bearing parts For example, the noise of centripetal ball bearing is lower than that of short cylindrical roller bearing, and the noise of short cylindrical roller bearing is lower than that of tapered roller bearing.
  • During the operation of the rolling bearing, it bears a certain load, even static load, but for the steel ball and raceway, its stress is cyclic, and the material will have rolling fatigue, so as to make the imported bearing reach its service life. The phenomenon is that a part of the rolling surface material suddenly falls off like a fish scale. This phenomenon is called fatigue flaking.Limit speed problem and noise treatment method of SKF Bearing
  • For the bearing of household appliances, the load borne by the bearing is very small and the service life of the bearing is very long. However, after the shaft rotates for a period of time, it will also produce wear, increased vibration and noise, deterioration of lubricating grease, etc. Due to the strict requirements on the bearing noise of household appliances, when the bearing noise exceeds the allowable range, it is considered that SKF Bearing can no longer be used. The total time of bearing low noise operation is called bearing noise life.Limit speed problem and noise treatment method of SKF Bearing
  • The bearings of household appliances are usually grease lubricated sealed bearings without maintenance. Although only a small amount of lubricant is needed for bearing lubrication, the bearing lubrication is poor due to the deterioration and leakage of grease after a long time of operation, resulting in bearing failure. The total operation time of SKF Bearing under good lubrication is called bearing life.Limit speed problem and noise treatment method of SKF Bearing

The bearings of household appliances are usually grease SKF Bearing

  •  In general, Koyo bearing, as a world bearing, will not be excited, but if it is excited, you must check the situation well. Let’s explain the truth of the excitation. 1. Vibration excitation may occur when the bearing is damaged locally. A small number of bearing raceways and rolling elements may be damaged due to incorrect operation or installation. During operation, rolling over damaged bearing parts will produce specific vibration frequency. Vibration frequency analysis can identify damaged bearing components.Limit speed problem and noise treatment method of SKF Bearing
  • Vibration excitation may occur when the waviness of Koyo bearing is not necessarily deformed. In the case of close fit between the bearing ring and the bearing seat or transmission shaft, the bearing ring may be deformed by matching with the shape of adjacent components. If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the bearing pedestal and drive shaft to the required tolerances.Limit speed problem and noise treatment method of SKF Bearing
  • In addition, the excitation behavior will also occur in applications. In many applications, the stiffness of the bearing is the same as that of the surrounding structure. Because of this feature, as long as the bearing (including preload and clearance) and its configuration in the application are correctly selected, it is possible to reduce the vibration in the application.Limit speed problem and noise treatment method of SKF Bearing
  • There is also the excitation generated when the number of loaded rolls changes. When a radial load is loaded on a bearing, the number of rolling elements bearing the load will change slightly during operation, that is, this causes the deviation of the load direction. The resulting vibration is inevitable, but can be reduced by axial preloading, which is applied to all rolling elements (not applicable to cylindrical roller bearings).Limit speed problem and noise treatment method of SKF Bearing
  •  Let’s introduce three small methods that can reduce the vibration of Koyo bearing. 1. Change the stiffness of the structure to change the critical frequency.  Remove critical excitation vibration from the application. 3. Suppress the critical excitation vibration between the excitation part and the resonance part.
  • The selection of specifications, dimensions and accuracy according to the service parts, service conditions and environmental conditions, and matching with appropriate Koyo bearings are the premise to ensure the service life and feasibility of bearings.Limit speed problem and noise treatment method of SKF Bearing
  •  The running state of the machine that needs to be checked is the focus of attention in the SKF Bearing
  • and it is becoming more and more important to prepare a thorough inspection scheme. Because it is an important condition monitoring of all rotating machinery components to prevent Koyo bearing damage and to prevent the early detection of bearing damage during unplanned maintenance equipment shutdown, it is an important part at home.Limit speed problem and noise treatment method of SKF Bearing
  • But not all machines are equipped with this advanced equipment. In this case, the machine operator or maintenance engineer must adhere to the Koyo bearing fault signal alarm.Limit speed problem and noise treatment method of SKF Bearing
  • The sharp squeaking noise may be caused by the improper clearance of Koyo bearing. Insufficient lubrication can also cause metal sound. Dents in the bearing cup track can cause vibration. As for the noise generated by the equipment caused by knocking scars, this noise has different speed levels of Koyo bearings. 
  • If there is intermittent noise, then the rolling part may be damaged. This sound appears. When the surface is damaged, if the bearing hiss “sound pollution often causes serious damage to the bearing and causes irregular and huge noise.Limit speed problem and noise treatment method of SKF Bearing
  • However, it is usually unnecessary to replace the Koyo bearing at this time. Therefore, bearing damage, of course, can also be perceived by listening. If better methods are used, such as electronic health monitoring equipment, the operation of bearings before eruption.Limit speed problem and noise treatment method of SKF Bearing
  •  When mass Timken one-way bearing is produced, the adjustment process system such as template, sample, stop and profiling is generally adopted; In single piece small batch production, the scale on the machine tool or gauge block is usually used for adjustment.
  • The content of adjustment also varies with the complexity of the workpiece. For simple surfaces (such as inner and outer cylindrical surfaces), generally only the position relationship of each forming motion is adjusted; For complex surfaces (such as spiral surface and involute surface), the speed relationship of forming motion must be adjusted. Therefore, the error of adjusting Timken one-way bearing is caused by many factors.Limit speed problem and noise treatment method of SKF Bearing

The measurement error of Timken SKF Bearing shall be less than 10% of the tolerance. 

  • The general measurement error is 10% ~ 33% of the combat merit difference. With the improvement of tolerance level, the larger the proportion of error is, that is, the smaller the tolerance is, the higher the proportion of error is. While the tolerance of Timken one-way imported bearing is more than it5, it is difficult to reach 10%. The measurement error does not mean that the inspection tolerance can be relaxed by 10%, but a certain margin should be given to ensure that the user can pass the acceptance according to the standard.Limit speed problem and noise treatment method of SKF Bearing

In each process of Timken one-way SKF Bearing

  • in order to obtain the size, shape and position accuracy of the bearing processing surface, the machine tool, fixture and cutting tool must be adjusted, and any adjustment work will inevitably bring some errors. In machining, the production batch and machining accuracy of bearing parts are often different, and the adjustment methods are also different.
  •  Koyo bearings support additional seals, which can effectively prevent the invasion of external enemies, but this will add additional sealing mechanism, installation and maintenance of bearings and inconvenient axial dimensions, and the sealing performance of shaft and housing will match the impact of precise body parts and tolerance. 
  • With a good sealed lubrication environment, but also the sealed bearing solves the problem of parts matching, but also eliminates the need for complex lubrication system. So compact, sealed key components, it is recommended to use sealed bearings. In addition to bearing in mind their own good dust seal and sealing effect, they also did not provide bearing lubricant and good operation state during operation, so as to reduce maintenance costs.Limit speed problem and noise treatment method of SKF Bearing
  • Koyo bearing seals are divided into contact and non-contact seals according to their structure. One form of contact can be divided into radial and axial seals. The sealing structure can be divided into single sealing lip and lip seal. Dust cover and rubber seal are two non-contact seals. Limit speed problem and noise treatment method of SKF Bearing
  • The sealing gap of dust cover is only applicable to dust. The sealing gap of rubber ring is very small, which has good sealing effect. The rubber seal of contact seal bearing has only a very minor part. The rubber lip seal ring contacts with the rotating bearing and adheres to the interference of some parts, so as to play a good dust-proof sealing effect, but at a lower speed limit and larger friction torque.Limit speed problem and noise treatment method of SKF Bearing
  • When Koyo bearing is in use, if it makes a loud sound, it means that it is the sound made by sliding friction between metals. At this time, there is no harmful effect on the bearing, and it will not affect its normal operation. But when this sound is made, where should we check to stop it? First of all, it is easy to produce sound when the radial clearance of the bearing is large, and it may also occur when a sudden speed occurs. Secondly, it is easy to appear in winter, and it often appears without rules.Limit speed problem and noise treatment method of SKF Bearing
  • Impurities such as sand or carbon particles are mixed in Koyo bearings. Dirt such as acids or paints,Limit speed problem and noise treatment method of SKF Bearing

SKF Bearing

Bearings extend the service life of wheels, pulleys, and other rotating parts by reducing friction and allowing components to move smoothly. Also called slewing bearings or slewing bearings, they are installed between two surfaces to keep parts aligned and support axial and radial loads. 

Axial (thrust) bearings support loads parallel to the axis of the shaft, such as loads applied by a table supporting heavy objects. 

skf-bearing

Radial bearings support rotating wheels and other applications where load forces are perpendicular to the shaft. Ball bearings are used in applications with high axial loads and medium to low radial loads. 

The seated bearing (bearing unit) has a bearing in the bearing seat unit to ensure firm installation and installation. Sleeve and clip bearings support high loads, have no moving parts, and require lubricants for smooth shaft rotation. Spherical bearings and spherical rod ends are used for joint joints and the bearings must be adapted to axial misalignment.

Product Catalog of SKF

SKF Deep Groove Ball Bearings

SKF Angular Contact Ball Bearing

SKF Pillow Block Bearings

SKF Self-aligning Ball Bearing

SKF Tapered Roller Bearings

SKF Needle Roller Bearing

SKF Cylinder Roller Bearing

SKF Thrust Ball Bearing

More Bearings

SKF Spherical Roller Bearing

SKF Thrust Roller Bearing

Product Description of SKF Bearing

Application of SKF bearing

  • SKF roller bearings have various cross-sections to meet various operating conditions and performance requirements.
  • SKF needle roller bearings
  • SKF needle roller bearings are cylindrical roller bearings whose diameter is small relative to their length. Improved roller/raceway profile prevents stress peaks, thereby extending bearing life. SKF offers many different designs, series and sizes of needle roller bearings to make them suitable for various working conditions and applications.
  • SKF cylindrical roller bearings
  • Cylindrical Roller Bearings
    SKF cylindrical roller bearings are available in a variety of designs, series and sizes. The main design differences between the bearings are:
  • Number of roller rows (one, two or four)
    Cage type (with, without or special design)
    Bearings with cages can withstand heavy radial loads, rapid acceleration and high speeds.
    A full complement bearing (without cage) contains the largest number of rollers and is therefore suitable for very heavy radial loads at moderate speeds.
  • SKF high-capacity cylindrical roller bearings combine the high load carrying capacity of a full complement bearing with the high speed capacity of a caged bearing.
    Configuration of inner and outer ring flanges (position and number of guide flanges)
  • SKF tapered roller bearings.
  • SKF Explorer tapered roller bearings can meet the toughest challenges
  • In today’s industrial world, you need solutions that can meet the toughest challenges and are ready to meet higher requirements. Solutions that work harder, work longer, and work safer. The powerful solution is sufficient to deal with challenging conditions and test environments. Provide longer and more consistent uptime solutions to ensure higher productivity and efficiency.
  • We understand the needs of the market and the scale of the challenges you face. Only by understanding these challenges can we propose better and more effective solutions.
  • You need one that can withstand high loads
    Tapered roller bearings are both durable and reliable
    Tapered roller bearings, one that will not affect your productivity and safety
    Tapered roller bearing A tapered roller bearing that can withstand challenging and extreme conditions
  • SKF spherical roller bearings
  • Spherical roller bearings have two rows of symmetrical rollers, a common spherical outer ring raceway and two inner ring raceways at a certain angle to the bearing axis. The center point of the sphere in the outer ring raceway is on the bearing axis.
  • Features of SKF spherical roller bearings:
    Misadjustment
  • Spherical roller bearings are self-aligning like self-aligning ball bearings or CARB bearings
  • High carrying capacity
  • Spherical roller bearings are designed to withstand heavy radial and axial loads in both directions.
  • long lasting
  • The manufacturing dimensions and geometric tolerances of the rollers are so strict that they are almost identical in a set of rollers. Symmetrical rollers are self-adjusting to provide optimal load distribution along the length of the rollers, and together with special contours to prevent stress peaks at the ends of the rollers
  • Low friction
  • Self-guided rollers keep friction and frictional heat at a low level . The floating guide ring guides the unloaded rollers so that they enter the load zone in the best position.
  • Firm
  • All SKF spherical roller bearings include robust window or fork cages.

Automotive-industry

Motor field

Motor field

Medical equipment

Medical equipment

Wind power

Wind power

Mechanical

Mechanical

Instrument

Instrument

Shipping & Package of SKF Bearing

Shipping port: Qingdao/Tianjin
Supply Ability: 100,000 pieces per month
Package:

  1. Plastic bag + single box + carton + plywood pallet
  2. Neutral industrial packaging + neutral carton packaging + pallet
  3. According to customer requirements
Package
Package

Why choose us

  1. Sample requirements: Contact us via email or trade manager, we will send samples according to your requirements.
  2.  World-class bearings: We provide customers with world-class quality domestically produced bearings.
  3. OEM or non-support bearings: As we have a wealth of knowledge and connections in the industry, we can easily meet any requirements for non-standard bearings.
  4. Outstanding quality of genuine products: The company has been proving that it provides 100% quality products with genuine intentions.
  5.  After-sales service and technical assistance: The company provides after-sales service and technical assistance according to customer requirements and needs.
  6. Fast delivery: The company provides on-time delivery through its streamlined supply chain.
  7.  Cost-saving: We provide long-life, anti-vibration, high-reliability bearings with high quality and better performance. This increases cost savings.
  8.  Answer customers’ questions in time: We believe that if customers are satisfied, it proves our value.
    Customers always get fast support.

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FAQ

Due to their internal design, ball bearings cannot usually be disassembled down to the component level; therefore, they cannot usually be refurbished.

Solid base shells are manufactured without cavities and fillers; they are stronger than hollow bases, and there are no traps for bacteria and fungi to grow. In the thermoplastic shell, the sturdy base will not break under steam or high-pressure washing. The hollow base saves material and weight to reduce costs. Some people use epoxy resin to backfill the hollow base to eliminate the trap of bacteria breeding, but this will not increase the strength, will cause the installation surface to be uneven, and water will seep between the shell and the filling material, causing cracking.

Use particularly thermally stable bearing rings, larger internal clearance (C4), specially selected lubricants that will not decompose at high temperatures, and zinc anodized flinger. There are two basic versions of our high temperature bearings. The suffix “C4HR5” represents the bearing that can withstand 400°F, and the suffix “C4HR23” represents the bearing that can withstand 450°F.

For critical applications such as pulp and paper processing, printing and packaging, material tearing can cause expensive downtime due to excessive torque and vibration.

The two biggest factors affecting the starting and running torque of the bearing are the seal design and lubricant selection. The shaft and bearing seat fit, component accuracy and surface finish, and retainer design also have some influence.

In higher speed applications, non-contact sealing devices are usually required to minimize operating torque and heat generation, so oil baffle rings and secondary sealing devices are usually required. Flowing oil lubrication systems are usually the best solution.

After proper installation, most seated bearings only need to be relubricated regularly with a small amount of grease and checked to ensure that they operate at low temperatures, quietness, and sufficient accuracy.

This depends on many factors, such as the application’s load conditions, operating speed, duty cycle, temperature, and operating environment. The technical information section of this website provides some basic information. Our engineers can help you determine more specific theoretical life calculations.

When noise and/or operating temperature increase or operating accuracy decreases, bearings should be replaced.

Lubricant of choice
Lubrication joint type or location
Sealing materials and design options
Dimensions, suitable for housing or insert
Fixing screw options
Paint the shell in any color

Too little or too much lubricant
Incorrect lubricant type
Poor bearing installation
Improper internal clearance
Excessive load and/or speed
Extreme temperature
Pollution
Movement between mounting surfaces

The noise emitted by the bearing may be caused by a combination of one or more factors, such as insufficient working clearance, excessive working clearance, changes in working clearance due to temperature, damage to the contact area, contamination, inappropriate lubricants or The raceway is damaged.

Lubricants have five basic functions for bearings:

Reduce friction
Reduce wear
Reduce temperature rise
Minimize corrosion
Seal contaminants

We do not recommend mixing grease. Mixing incompatible greases will cause the mixture to harden, preventing it from releasing any oil. Mixing incompatible greases can also soften the mixture, which releases all the oil. In either case, the mixture will not be able to properly lubricate the bearing. We strongly recommend using the same type of grease originally provided with the bearing.