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‌  In the field of electric motors, the placement of positioning bearings in vertical motors is critically important and requires comprehensive consideration of multiple factors.    ‌From the perspective of motor structure and force analysis:‌ In horizontal motors, bearings primarily withstand radial loads, whereas in vertical motors, rotor gravity converts to axial loads. Typically, one end is fixed (positioning) to bear axial forces, thus requiring bearings capable of handling axial loads. ‌Selection of positioning bearing location is influenced by external loads on the shaft extension end:‌ Example: In vertical pump motors, the shaft extension connects to impellers and faces radial impact from water flow. If the positioning bearing is placed at the lower (shaft extension) end, it must simultaneously endure rotor gravity and radial hydraulic forces, accelerating wear. ‌Case Study‌: Kenda Bearing served a pump manufacturer where improper positioning bearing placement reduced bearing life to 60% of the design value. After relocating the positioning bearing to the upper end (with the lower end floating), service life extended to 1.5 times the original. ‌Maintenance accessibility is equally critical:‌ Positioning bearings endure combined loads (axial + radial), demanding frequent maintenance. For vertical motors in harsh environments (e.g., mining equipment), maintenance complexity increases if the positioning bearing is on the non-shaft-extension end, as it may require disassembling auxiliary components like fans or covers. ‌Conclusion:‌There is no universal answer for positioning bearing placement in vertical motors. Optimal selection must integrate motor structure, shaft-end load conditions, and maintenance feasibility to ensure stable and efficient operation.

  Within the critical components of electric motor operation, deep groove ball bearings stand as the most widely adopted solution due to their distinctive advantages.   The structural design of deep groove ball bearings embodies sophisticated engineering. Comprising an inner ring, outer ring, rolling elements, and cage, their deep-groove-profile raceways enable simultaneous handling of radial loads and bidirectional axial loads – earning them the title of 'universal joints' in electric motors. The curvature radii of raceways and rolling elements undergo meticulous calculation, optimizing contact area while minimizing friction coefficients. During high-speed motor operation, the cage uniformly spaces rolling elements to prevent frictional collisions. Coupled with high-performance grease, this design confines temperature rise within ideal parameters – a critical factor for continuously operated motors.   In terms of performance compatibility, deep groove ball bearings are optimally aligned with electric motor requirements. Most standard motors operate at 1500-3000 r/min—well within the limiting speed range of these bearings, which can even accommodate certain high-speed motor applications. Their radial clearance is adjustable according to operational demands, spanning from the minimal clearance of C2 grade to the increased clearance of C4 grade, thereby accommodating shaft expansion across diverse temperature environments.  Installation simplicity further drives their ubiquity. Deep groove ball bearings tolerate minor coaxiality deviations during motor assembly, eliminating stringent alignment requirements. Versatile models serve applications from light-load scenarios in small appliance motors to medium-load industrial drives. For instance:     Household A/C compressor motors typically employ 6205 series bearings.     Auxiliary spindle motors in machine tools frequently utilize 6310 bearings with ZZ shields.   Advancements in materials and manufacturing further enhance their capabilities. Rings and rolling elements forged from high-carbon chromium bearing steel (GCr15) achieve HRC 60-65 hardness after quenching and tempering, delivering exceptional wear resistance. Seal configurations—ranging from non-contact rubber shields (2RS) to contact seals (2RZ)—offer flexible selection based on motor IP requirements, effectively blocking particulate and oil contaminants   From micro stepping motors to large induction motors, deep groove ball bearings serve as indispensable fundamental components in the electromechanical industry. Their well-rounded performance characteristics, universal adaptability, and cost efficiency collectively underpin the stable operation of countless devices     Kent Bearings delivers silent operation solutions to 500+ global motor manufacturers, with over 200 million units deployed. Contact our Technical Service Team at +86-19957451956 for complimentary motor-bearing compatibility validation services. Unlock quantifiable ROI through precision quietness upgrades!

  Selecting the appropriate bearing clearance requires comprehensive consideration of factors such as bearing type, operating conditions, fit methods, and other multifaceted aspects to ensure the bearing achieves optimal performance during operation (long life, low heat generation, minimal vibration, stable accuracy).     Core Influencing Factors     Operating Conditions:   1. Load Conditions‌ Heavy-load scenarios: Select slightly larger clearance to avoid bearing contact stress concentration. Light-load high-precision applications: Opt for smaller clearance. ‌   2. Rotational Speed‌ High-speed operation: Reserve greater clearance to compensate for thermal expansion (pronounced temperature rise during rotation). Low-speed heavy-load conditions: Choose smaller clearance to enhance rigidity.  ‌   3. Temperature Environment‌ High/low temperature extremes: Select larger clearance to counteract clearance reduction caused by differential thermal expansion between inner and outer rings. Fitting Methods: 1. Interference Fit for Inner Ring‌ When the inner ring adopts an interference fit with the shaft, it induces ring expansion, reducing radial clearance. Compensation requires selecting a ‌larger initial clearance group‌ (e.g., C3/C4). ‌2. Interference Fit for Outer Ring‌ An interference fit between the outer ring and housing causes ring contraction, similarly decreasing clearance. This necessitates ‌elevating the clearance grade‌. ‌3. Clearance Fit‌ For clearance fits between rings and mating surfaces, standard clearance groups (e.g., CN/C0) may be applied without compensation adjustments. Bearing Types ‌    1. Self-Aligning Bearings & Cylindrical Roller Bearings‌     Require larger clearance groups to accommodate self-alignment or compensate for deformation. ‌    2. Angular Contact Ball Bearings & Tapered Roller Bearings‌     Typically require controlled clearance via ‌preload‌ to enhance rigidity.  ‌   3. Deep Groove Ball Bearings‌     Select clearance groups (CN/C2/C3) based on temperature and vibration requirements.  

  "The trial production of the 150,000 RPM motor has reached the third batch, yet the bearing burnout rate remains at 12%. If this continues, the mass production plan for next month will have to be shelved!" When Engineer Wang from a start-up home appliance brand contacted us, his tone was quite anxious.   This vacuum cleaner, marketed with "Hurricane Suction," has delayed mass production three times due to abnormal noises from its self-developed motor.Kent Bearings' salesperson, upon receiving this client, immediately collaborated with the technical department to solve the bearing issues.   Soon, the motor prototype was brought to Kent Bearings' technical department; after disassembling it, the technical team quickly identified the key problem.Facing the client's anxiety, Kent Bearings promptly initiated a full-cycle service mechanism.They intervened from the R&D stage, completing parameter adjustments for the motor bearings and producing samples within a week. During production, engineers were stationed on-site to ensure installation precision throughout the process.During the trial phase, they synchronously tracked test data, making the extreme test results of 500 bearing samples a reassurance for mass production.   Entering the mass production stage, supporting services were further deepened: custom vibration detection for the client's quality inspection team was implemented to ensure every motor bearing shipped out is a premium product. A dedicated service group is online 24/7, ready to respond to any sudden queries during production."Now, our motor has not only passed EU CE certification, but also has 5 dB lower noise than competitors." Engineer Wang's voice on the phone couldn't hide his excitement.                                   Selecting bearings shouldn't solely focus on speed parameters; they must match the vacuum cleaner's operating conditions. Kent Bearings' selection engineers will recommend tailored solutions based on motor power, air duct design, and usage scenarios: for household models, the focus is on quietness, while for commercial models, enhanced wear resistance is emphasized. Nowadays, more and more manufacturers realize that precision bearings are not just a cost, but a 'multiplier' to enhance product capability. Contact Kent Technical Service Team at 19957028916, to make precision bearings the 'invisible engine' of product competitiveness.  

Have the bosses, purchasers, and engineers of water pump factories been tormented by bearings and lost sleep? The customers complained about the loud noise, water leakage, and frequent shutdown of the newly delivered water pumps. The orders were about to be cancelled, and the after-sales costs soared. Are you upset? A few days ago, a water pump factory specializing in water treatment equipment was in a hurry. They had just developed a high-power circulating water pump, which was intended to open up the high-end market. As a result, during the trial operation, the noise of the water pump was so loud that people's ears hurt, and there were frequent problems of shaft seal leakage and bearing jamming. The initial diagnosis was that the bearing was the cause. The water pump manufacturer was helpless. He searched for Kent Bearings in short videos and contacted us. When the technicians of Kent Bearings arrived at the scene and disassembled it, they found that the bearings used in the water pumps had a big problem. The original bearings were not accurate enough, and the raceways were not flat enough, which caused the water pumps to vibrate violently during operation. The sealing structure design was unreasonable, and moisture and dust penetrated into the bearings through the gaps, accelerating rust. The lubrication performance was also not up to standard, and the grease quickly failed in high temperature and high humidity environments. Kent Bearings has deep groove ball bearings specially developed for water pumps. Starting from the raw materials, we use highly rust-proof special steel, combined with a double-layer labyrinth seal structure, to maximize the waterproof and dustproof effect. The high-precision grinding process allows the raceway and steel ball to fit perfectly, and the vibration when the water pump is running is almost negligible. Special grease can also provide long-term lubrication in humid environments. After reinstalling the machine, the noise of the water pump was greatly reduced, and it ran continuously for 72 hours without any trouble! Compared with ordinary bearings, which have poor precision, weak sealing, and short life, they are time bombs when used in water pumps. Frequent rework and replacement of bearings will not only increase costs, but also ruin reputation. Kent bearings, with high precision, strong sealing, and super durability, can adapt to various complex working conditions, helping you reduce after-sales costs and retain high-quality customers.

I recently met a friend who works in an electric motor factory. He was very upset. They had chosen low-priced bearings because they were greedy for cheapness. As a result, the production workshop was like a supermarket just half a year after the motor was put into production. The bearings made a clanging sound when they turned, and the vibration was so strong that it could loosen the screws. There were even cases where the bearings were stuck and the motors smoked directly. The purchasing manager was chased and scolded by the boss every day, and the assembly master was so tired that he sighed. The maintenance cost and downtime loss added up to several times more than the little money saved on the bearings.Later, they found us and found out where the problem was. Ordinary bearings are not accurate enough and are prone to wear after running for a long time. The lubrication design is unreasonable, and the grease loses quickly at high temperatures, so the noise is naturally loud. In addition, the material is not up to standard, and it can't withstand high-speed operation at all. Kent bearings can achieve P5/P6 level accuracy and a unique silent structure. Take 6201 for example, we can control it within 23 decibels. The special heat treatment process allows the bearings to run stably for 30,000 hours at a high speed of 10,000 revolutions. If you do the math, you will know that although the unit price of ordinary bearings seems to be lower, on the production line, the yield rate plummets because the bearing accuracy does not meet the standard and the motor vibration exceeds the standard. Customers keep complaining because the bearings are too noisy, which seriously affects the user experience. Not to mention frequent rework, which not only delays delivery, but also wastes real money. In fact, many motor factories are repeating this lesson: they always want to use low-priced bearings to reduce costs, but are finally dragged down by high hidden costs. Choosing bearings is like finding a "heart" for a motor. Cheap ones may look fine at first, but over time, all kinds of problems will emerge. Is the "heart" of the motors you produce still healthy? Contact:19957426729(WhatsApp)     bugao@bgbearing.com(Email)

"Manager Zhang of a motor factory in Zhejiang Province was just scolded by a customer. The new household air conditioner motor made a tractor-like noise in three months. The bearings of two suppliers were not solved. After two reworks, the customer's order was about to be cancelled..." After changing to Kent, there was no rework in three years, and the maintenance cost was cut in half. Replacing a bearing = replacing the bombardment of after-sales phone calls, replacing the anxiety of backlog of work orders, and replacing the risk of customer loss. Seeing this, have the bosses and engineers of the motor factory also encountered similar problems? Ordinary bearings are deformed, noisy, and can't go up to speed after being used for a long time, causing you to be complained by customers and half of your profits are swallowed up by after-sales maintenance? Many bearings on the market have the shortcomings of insufficient precision: the inner and outer rings have large tolerances, the vibration exceeds the standard when the motor is installed, the bearing seat wears quickly, and the life span does not last more than half a year. Cutting corners on materials: using ordinary steel, metal fatigue under high temperature and high speed, directly stuck. Lubrication technology is old-fashioned: grease is lost at high temperature, the abnormal noise becomes louder and louder, and customers shake their heads when they hear it. Kent bearings' solution is 0.002mm ultra-precision machining, with a vibration value 30% lower than the national standard. High-speed motors (above 10,000r/min) can run for 3 years without shaking or making noise. Vacuum degassed bearing steel + special heat treatment, temperature resistance of 160°C, impact strength increased by 50%, and variable frequency motors are not afraid of using them. Fully enclosed polymer self-lubricating technology, the grease will not dry up for 10 years, and the silent effect makes home appliance customers actively repurchase. Contact:19957426729(WhatsApp)     bugao@bgbearing.com(Email)

The installation force required to install precision bearings or annular workpieces tends to increase rapidly as the bearing size increases. Because of the installation force requirements, larger precision bearings are difficult to push onto the shaft or into the bearing seat. Especially when the inner diameter of the precision bearing is greater than 70mm or the interference fit is large, the precision bearing, bearing seat and annular workpiece need to be heated before installation. Using the principle of thermal expansion and contraction, the heating method is used to expand the precision bearing hole. This not only saves effort and time during installation, but also avoids damage caused by excessive force. Under normal circumstances, when using oil bath heating or electric induction heating methods, the heating temperature of standard bearings should not be higher than 100℃, and that of high-speed bearings should not be higher than 150℃. 1. Electric heating plate heating method Put the precision bearing on a hot plate at a temperature of 100℃ for a few minutes. This method is relatively simple. Flipping it several times can make the precision bearing heat evenly and at the same time have high efficiency. This method can also be used for large and small joint bearings. 2. Electric furnace heating method Place the precision bearing in a closed automatic temperature-controlled electric furnace for heating. This method heats evenly, controls the temperature accurately, and heats quickly. It is suitable for heating more precision bearings at one time. 3. Induction heating methodmatch uses an induction heater to quickly, stably and neatly heat the joint bearing to the required temperature. It is especially suitable for situations where the inner ring is tightly fitted, because only the inner ring is heated, and the outer ring is not heated enough. In this way, it can be installed on the shaft and easily installed in the seat hole. 4. Light bulb heating methodmatch uses a 50W light bulb to heat the bearing, which can ensure that the heating temperature is around 100℃. Smaller precision bearings can be placed directly on the bulb, and larger precision bearings can be placed in the conical cover of the bulb. The conical cover can also prevent the heat loss of the bulb. At the same time, the heating is uniform and the conical cover can be adjusted up and down. This method can be adapted to heating precision bearings of different sizes within a certain range. If a far-infrared bulb is used, it is also necessary to pay attention to the direction of the bulb should be downward to prevent infrared rays from affecting the human eye. The bulb heating method is suitable for occasions where the bearing needs to be heated infrequently and in small quantities. The bulb can also be used as a lighting device on weekdays. No other equipment is required. Contact:19957426729(WhatsApp)     bugao@bgbearing.com(Email)

In order to help motor manufacturers maximize the efficiency of bearing applications, Kent Bearings has built a closed-loop support from design and development to after-sales guarantee through full-process technical collaboration and agile service system, providing systematic solutions for motor customers. Kent Bearings has been working closely with motor manufacturers since the early product development stage. The bearing technology team has a deep understanding of the design requirements, operating conditions and performance goals of the motor. Combined with its own professional knowledge, it provides bearing selection suggestions for motor design, optimizes the bearing installation structure, ensures the perfect match between the bearing and the motor, and reduces the probability of bearing problems from the source. During the motor production process, if there are problems with the motor bearings, Kent Bearings provides on-site technical support services. Professional engineers are dispatched to assist motor manufacturers in bearing installation guidance to ensure that the installation process meets standard requirements. At the same time, the motor bearings on the motor production line are randomly inspected to strictly control product quality and avoid affecting the overall performance of the motor due to motor bearing quality problems. When the motor manufacturer's customers report that the bearing is faulty, the rapid response mechanism is immediately activated. After receiving the notification, the after-sales service team of Kent Bearings will communicate with the customer as soon as possible to understand the fault phenomenon in detail and arrive at the site in the shortest time. We use professional testing equipment and rich experience to diagnose and analyze bearing failures and develop solutions. If bearings need to be replaced, we ensure that high-quality replacement products are provided quickly and that subsequent use is tracked to ensure that the problem is completely resolved. If you have any questions about the use of your motor bearings, please contact Kent Bearing to provide you with well-made motor bearings, one-stop and worry-free after-sales service. Contact:19957426729(WhatsApp)     bugao@bgbearing.com(Email)

There are significant differences in performance, quality and service life of low-priced bearings and high-priced bearings. The main differences are reflected in the following aspects: 1. Materials and manufacturing processesLow-priced bearings:Ordinary steel or low-quality alloys are usually used, with poor hardness and wear resistance.The manufacturing process is simple, the accuracy is low, and there may be problems such as burrs and high roughness.High-priced bearings:Use high-quality bearing steel (such as GCr15, SUJ2) or special alloys (such as stainless steel, ceramic mixed materials).After precision processing (such as grinding, super-finishing), the surface finish is high and the tolerance control is strict.2. Accuracy and performanceLow-priced bearings:The accuracy level is low (such as P0 level or non-standard level), and the vibration and noise are high when rotating.It is easy to generate heat during high-speed operation and has a short lifespan.High-priced bearings:High precision level (such as P5, P4 and even P2 levels), suitable for precision machinery (such as machine tools and instruments).It can still maintain stable operation under high speed and high load, with low noise and low temperature rise.3. Lubrication and sealingLow-priced bearings:Using ordinary grease is easy to volatile and oxidize, and requires frequent maintenance.The sealing structure is simple (such as single-layer rubber seal), and the dust-proof and waterproof performance is poor.High-priced bearings:Use high-performance lubricants (such as fully synthetic grease) for long-term maintenance-free.Multi-seal design (such as contact + non-contact seal), with strong dustproof, waterproof and corrosion-proof capabilities.4. Lifespan and reliabilityLow-priced bearings:Under standard load, lifespan is short and prone to early failure (such as peeling and stuck).Suitable for low-load, intermittent working scenarios (such as household appliances, ordinary machinery).High-priced bearings:After strict life tests (such as L10 life calculation), high durability.Suitable for high load, continuous working environments (such as industrial motors, automotive gearboxes).Kent Bearings specializes in manufacturing high-quality silent motor bearings for more than 20 years. Using Kent Bearings can reduce after-sales costs. Kent Bearings with long life are the best choice to ensure the stable operation of your products. Contact:19957426729(WhatsApp)     bugao@bgbearing.com(Email)

Angular contact ball bearings are precision bearings designed to handle combined radial and axial loads (unidirectional or bidirectional). Their key feature is the contact angle, which enables superior axial load capacity compared to deep groove ball bearings. 1. Basic Construction Angular contact bearings consist of the following components: Component Function Inner Ring Fits onto the shaft, with a raceway to support rolling elements. Outer Ring Mounts in the housing; its raceway is offset to create the contact angle. Rolling Elements Steel or ceramic balls that transmit loads between rings. Cage Holds balls in place (made of nylon, brass, or steel). Contact Angle (α) Critical design parameter. The angle between the load line and radial plane (typically 15°, 25°, or 40°). 2. Working Principle (1) Role of the Contact Angle (α) Definition: The angle formed between the line connecting ball-to-raceway contact points and the radial plane. Impact: Larger α (e.g., 40°) → Higher axial load capacity. Smaller α (e.g., 15°) → Better radial load handling. (2) Load Transmission Mechanism Radial Load: Transferred from the inner ring to the outer ring via rolling elements. Axial Load: Due to the contact angle, axial force is decomposed into radial and axial components, both supported by the bearing. 3. Bearing Arrangement (Paired Mounting) To improve rigidity and load capacity, angular contact bearings are often paired: Arrangement Characteristics Applications Back-to-Back (DB) Wider outer ring faces outward; high moment rigidity (for cantilever loads). Machine tool spindles. Face-to-Face (DF) Narrower outer ring faces inward; better axial rigidity but lower moment resistance. Pumps, compressors. Tandem (DT) Same direction; shares axial load for extreme thrust requirements. Turbines, centrifuges. 4. Angular Contact vs. Deep Groove Ball Bearings Feature Angular Contact Bearing Deep Groove Bearing Load Capacity Radial + Axial (unidirectional/bidirectional). Primarily radial. Speed High (but lower than deep groove). Higher (lower friction). Precision High (ABEC-5/P4 common). Standard (ABEC-1/3). Mounting Requires preload adjustment (often paired). Simple (single-unit use). 5. Common Applications Machine Tool Spindles (CNC, grinding machines). Automotive Wheel Hubs (combined radial + axial loads). Pumps & Compressors (unidirectional thrust). Robotic Arms (precision motion control). 6. Key Selection Parameters Contact Angle (15° / 25° / 40°). Accuracy Class (ABEC-5, P4, etc.). Preload (Light/Medium/Heavy). Material (Steel, hybrid ceramic).

1. Four-point contact ball bearings are a type of radial single-row angular contact ball bearings. The raceways are designed to support axial loads in two directions. Four-point contact ball bearings can withstand radial loads up to a fraction of the axial load. Compared with double-row bearings, four-point contact ball bearings occupy significantly less axial space.The contact angle of the SKF four-point contact ball bearing designed by QJ is 35° or 45°. The inner ring is a split inner ring. This allows a larger number of balls to be loaded into the bearing, which can give the bearing a higher load-bearing capacity. This SKF four-point contact ball bearing is a split design, that is, the outer ring with the ball and cage assembly can be installed separately with the two inner ring half rings. 2. The inner ring (or outer ring) of the four-point contact ball bearing is precisely assembled from two half rings, and the curvature radius of the groove of its overall periphery (or inner ring) is very small, so that the steel ball and the inner and outer rings are in contact at four "points", which not only increases the radial load capacity, but also can withstand large axial loads in two directions with a compact size, and has a good axial limit capacity in two directions. This is because its axial clearance is relatively small, and its contact angle (generally 35°) is relatively large. 3. The allowable speed of the four-point contact ball bearing is also very high, and it runs very smoothly. Its two half rings can be removed from the whole set of bearings and installed separately, so the four-point contact ball bearing is mostly used in the engine because it can withstand large radial and axial loads at higher speeds.The two inner rings of the half of the SKF Explorer four-point contact ball bearing have deep-bottomed shoulders (fig). When this four-point contact ball bearing is used with SKF cylindrical roller bearings, the oil flow rate is increased. In addition, these deep recesses can be used to secure the puller when disassembling the four-point contact ball bearing. Contact:19957426729(WhatsApp)     bugao@bgbearing.com(Email)