Product Description
Cylindrical roller bearings are available in a wide range of designs, series, variants and sizes. The main design differences are the number of roller rows and the inner/outer ring flanges as well as cage designs and materials.
The bearings can meet the challenges of applications faced with heavy radial loads and high speeds. Accommodating axial displacement (except for bearings with flanges on both the inner and outer rings), they offer high stiffness, low friction and long service life.Â
Cylindrical roller bearings are also available in sealed or split designs. In sealed bearings, the rollers are protected from contaminants, water and dust, while providing lubricant retention and contaminant exclusion. This provides lower friction and longer service life. Split bearings are intended primarily for bearing arrangements which are difficult to access, such as crank shafts, where they simplify maintenance and replacements.Â
Features and benefits
- High load carrying capacity
- High stiffness
- Accommodate axial displacementÂ
Except for bearings with flanges on both the inner and outer rings. - Low friction
The open flange design, - Together with the roller end design and surface finish, promote lubricant film formation resulting in lower friction and higher axial load carrying capability.
- Long service life
The logarithmic roller profile reduces edge stresses at the roller/raceway contact  and sensitivity to misalignment and shaft deflection. - Enhanced operational reliability
The surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricant film. - Separable and interchangeable
The separable components of cylindrical roller bearings are interchangeable. This facilitates mounting and dismounting, as well as maintenance inspections.
Applications
Cylindrical roller bearings have characteristics that make them suitable for use in many types of industrial applications and essential for some. They can be used in both locating and non-locating bearing positions in bearing arrangements in for example:
- Stationary gearboxes
- Automotive gearboxes
- Electric motors
- Vibration motors
- Wind turbines
- Off-highway equipment
- Pumps and compressors
- Material handling equipment
- Textile machinery
- Rail vehicles
- Rolling mills
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Types NU, N, NNU, and NN are suitable as free-end bearings.Â
Types NJ and NF can sustain limited axial loads in 1 direction.
Types NH and NUP can be used as fixed-end bearings.
NH-type cylindrical roller bearings consist of the NJ-type cylindrical roller bearings and HJ-type L-shaped thrust collars.
The inner ring loose rib of an NUP-type cylindrical roller bearing should be mounted so that the marked side is on the outside.
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Parameters of Bearing | ||||||||
Model | d | D | B | Cr | Cor | Limiting Speed (r/min) | Mass | |
(mm) | (mm) | (mm) | (kN) | (kN) | Grease | Oil | (kg) | |
NU202 | 15 | 35 | 11 | 7.98 | 5.5 | 15000 | 19000 | – |
NU203 | 17 | 40 | 12 | 9.12 | 7 | 14000 | 18000 | – |
NU303 | 17 | 47 | 14 | 12.8 | 10.8 | 13000 | 17000 | 0.147 |
NU1004 | 20 | 42 | 12 | 10.5 | 9.2 | 13000 | 17000 | 0.09 |
NU204E | 20 | 47 | 14 | 25.8 | 24 | 12000 | 16000 | 0.117 |
NU2204E | 20 | 47 | 18 | 30.8 | 30 | 12000 | 16000 | 0.149 |
NU3O4E | 20 | 52 | 15 | 29 | 25.5 | 11000 | 15000 | 0.155 |
NU2304E | 20 | 52 | 21 | 39.2 | 37.5 | 10000 | 14000 | 0.216 |
NU1005 | 25 | 47 | 12 | 11 | 10.2 | 11000 | 15000 | 0.1 |
NU205E | 25 | 52 | 15 | 27.5 | 26.8 | 11000 | 14000 | 0.14 |
NU2205E | 25 | 52 | 18 | 32.8 | 33.8 | 11000 | 14000 | 0.168 |
NU305E | 25 | 62 | 17 | 38.5 | 35.8 | 9000 | 12000 | 0.251 |
NU2305E | 25 | 62 | 24 | 53.2 | 54.5 | 9000 | 12000 | 0.355 |
NU1006 | 30 | 55 | 13 | 13 | 12.8 | 9500 | 12000 | 0.12 |
NU206E | 30 | 62 | 16 | 36 | 35.5 | 8500 | 11000 | 0.214 |
NU2206E | 30 | 62 | 20 | 45.5 | 48 | 8500 | 11000 | 0.268 |
NU306E | 30 | 72 | 19 | 49.2 | 48.2 | 8000 | 10000 | 0.377 |
NU2306E | 30 | 72 | 27 | 70 | 75.5 | 8000 | 10000 | 0.538 |
NU406 | 30 | 90 | 23 | 57.2 | 53 | 7000 | 9000 | 0.73 |
NU1007 | 35 | 62 | 14 | 19.5 | 18.8 | 8500 | 11000 | 0.16 |
NU207E | 35 | 72 | 17 | 46.5 | 48 | 7500 | 9500 | 0.311 |
NU2207E | 35 | 72 | 23 | 57.5 | 63 | 7500 | 9500 | 0.414 |
NU307E | 35 | 80 | 21 | 62 | 63.2 | 7000 | 9000 | 0.501 |
NU2307E | 35 | 80 | 31 | 87.5 | 98.2 | 7000 | 9000 | 0.738 |
NU407 | 35 | 100 | 25 | 70.8 | 68.2 | 6000 | 7500 | 0.94 |
NU1008 | 40 | 68 | 15 | 21.2 | 22 | 7500 | 9500 | 0.22 |
NU208E | 40 | 80 | 18 | 51.5 | 53 | 7000 | 9000 | 0.394 |
NU2208E | 40 | 80 | 23 | 67.5 | 75.2 | 7000 | 9000 | 0.507 |
NU308E | 40 | 90 | 23 | 76.8 | 77.8 | 6300 | 8000 | 0.68 |
NU2308E | 40 | 90 | 33 | 105 | 118 | 6300 | 8000 | 0.974 |
NU408 | 40 | 110 | 27 | 90.5 | 89.8 | 5600 | 7000 | 1.25 |
NU1009 | 45 | 75 | 16 | 23.2 | 23.8 | 6500 | 8500 | 0.26 |
NU209E | 45 | 85 | 19 | 58.5 | 63.8 | 6300 | 8000 | 0.45 |
NU2209E | 45 | 85 | 23 | 71 | 82 | 6300 | 8000 | 0.55 |
NU309E | 45 | 100 | 25 | 93 | 98 | 5600 | 7000 | 0.93 |
NU2309E | 45 | 100 | 36 | 130 | 152 | 5600 | 7000 | 1.34 |
NU400 | 45 | 120 | 29 | 102 | 100 | 5000 | 6300 | 1.8 |
NU1571 | 50 | 80 | 16 | 25 | 27.5 | 6300 | 8000 | – |
NU210E | 50 | 90 | 20 | 61.2 | 69.2 | 6000 | 7500 | 0.505 |
NU2210E | 50 | 90 | 23 | 74.2 | 88.8 | 6000 | 7500 | 0.59 |
NU310E | 50 | 110 | 27 | 105 | 112 | 5300 | 6700 | 1.2 |
NU2310E | 50 | 110 | 40 | 155 | 185 | 5300 | 6700 | 1.79 |
NU410 | 50 | 130 | 31 | 120 | 120 | 4800 | 6000 | 2.3 |
NU1011 | 55 | 90 | 18 | 35.8 | 40 | 5600 | 7000 | 0.45 |
NU211E | 55 | 100 | 21 | 80.2 | 95.5 | 5300 | 6700 | 0.68 |
NU2211E | 55 | 100 | 25 | 94.8 | 118 | 5300 | 6700 | 0.81 |
NU311E | 55 | 120 | 29 | 128 | 138 | 4800 | 6000 | 1.53 |
NU2311E | 55 | 120 | 43 | 190 | 228 | 4800 | 6000 | 2.28 |
NU411 | 55 | 140 | 33 | 128 | 132 | 4300 | 5300 | 2.8 |
NU1012 | 60 | 95 | 18 | 38.5 | 45 | 5300 | 6700 | 0.48 |
NU212E | 60 | 110 | 22 | 89.8 | 102 | 5000 | 6300 | 0.86 |
NU2212E | 60 | 110 | 28 | 122 | 152 | 5000 | 6300 | 1.12 |
NU312E | 60 | 130 | 31 | 142 | 155 | 4500 | 5600 | 1.87 |
NU2312E | 60 | 130 | 46 | 212 | 260 | 4500 | 5600 | 2.81 |
NU412 | 60 | 150 | 35 | 155 | 162 | 4000 | 5000 | 3.4 |
SAMPLES
1. Samples quantity: 1-10 PCS are available.
2. Free samples:Â It depends on the Model No., material and quantity. Some of the bearings samples need client to pay samples charge and shipping cost.
3. It’s better to start your order with Trade Assurance to get full protection for your samples order.
CUSTOMIZED
The customized LOGO or drawing is acceptable for us.
MOQ
1. MOQ:Â 10 PCS standard bearings.
2. MOQ: 1000 PCS customized your brand bearings.
OEM POLICY
1. We can printing your brand (logo, artwork)on the shield or laser engraving your brand on the shield.
2. We can custom your packaging according to your design
3. All copyright own by clients and we promised don’t disclose any info.
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Rolling Body: | Roller Bearings |
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The Number of Rows: | Single |
Outer Dimension: | Small (28-55mm) |
Samples: |
US$ 1/Set
1 Set(Min.Order) | Order Sample |
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Customization: |
Available
| Customized Request |
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.shipping-cost-tm .tm-status-off{background: none;padding:0;color: #1470cc}
Shipping Cost:
Estimated freight per unit. |
about shipping cost and estimated delivery time. |
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Payment Method: |
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Initial Payment Full Payment |
Currency: | US$ |
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Return&refunds: | You can apply for a refund up to 30 days after receipt of the products. |
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How does Preload Affect the Performance and Efficiency of Ball Bearings?
Preload is a crucial factor in ball bearing design that significantly impacts the performance, efficiency, and overall behavior of the bearings in various applications. Preload refers to the intentional axial force applied to the bearing’s rolling elements before it is mounted. This force eliminates internal clearance and creates contact between the rolling elements and the raceways. Here’s how preload affects ball bearing performance:
- Reduction of Internal Clearance:
Applying preload reduces the internal clearance between the rolling elements and the raceways. This eliminates play within the bearing, ensuring that the rolling elements are in constant contact with the raceways. This reduced internal clearance enhances precision and reduces vibrations during operation.
- Increased Stiffness:
Preloaded bearings are stiffer due to the elimination of internal clearance. This increased stiffness improves the bearing’s ability to handle axial and radial loads with higher accuracy and minimal deflection.
- Minimized Axial Play:
Preload minimizes or eliminates axial play within the bearing. This is especially important in applications where axial movement needs to be minimized, such as machine tool spindles and precision instruments.
- Enhanced Rigidity:
The stiffness resulting from preload enhances the bearing’s rigidity, making it less susceptible to deformation under load. This is critical for maintaining precision and accuracy in applications that require minimal deflection.
- Reduction in Ball Slippage:
Preload reduces the likelihood of ball slippage within the bearing, ensuring consistent contact between the rolling elements and the raceways. This leads to improved efficiency and better load distribution.
- Improved Running Accuracy:
Preloading enhances the running accuracy of the bearing, ensuring that it maintains precise rotational characteristics even under varying loads and speeds. This is essential for applications requiring high accuracy and repeatability.
- Optimized Performance at High Speeds:
Preload helps prevent skidding and slipping of the rolling elements during high-speed operation. This ensures that the bearing remains stable, reducing the risk of noise, vibration, and premature wear.
- Impact on Friction and Heat Generation:
While preload reduces internal clearance and friction, excessive preload can lead to higher friction and increased heat generation. A balance must be struck between optimal preload and minimizing friction-related issues.
- Application-Specific Considerations:
The appropriate amount of preload depends on the application’s requirements, such as load, speed, accuracy, and operating conditions. Over-preloading can lead to increased stress and premature bearing failure, while under-preloading may result in inadequate rigidity and reduced performance.
Overall, preload plays a critical role in optimizing the performance, accuracy, and efficiency of ball bearings. Engineers must carefully determine the right preload level for their specific applications to achieve the desired performance characteristics and avoid potential issues related to overloading or inadequate rigidity.
What Precautions should be taken to Prevent Contamination of Ball Bearings in Industrial Settings?
Preventing contamination of ball bearings is essential to ensure their proper function, longevity, and overall performance in industrial settings. Contaminants such as dust, dirt, debris, and particles can significantly impact bearing operation. Here are important precautions to take to prevent contamination of ball bearings:
- Effective Sealing:
Choose ball bearings with appropriate seals or shields to prevent the ingress of contaminants. Seals provide a physical barrier against dust, moisture, and particles, ensuring the bearing’s interior remains clean.
- Clean Environment:
Maintain a clean working environment around the machinery and equipment. Regularly clean the surrounding areas to prevent the accumulation of dirt and debris that could enter the bearings.
- Proper Handling:
Handle bearings with clean hands and use gloves if necessary. Avoid touching the bearing surfaces with bare hands, as natural skin oils can transfer contaminants onto the bearing.
- Clean Tools and Equipment:
Use clean tools and equipment during installation and maintenance to prevent introducing contaminants. Ensure that tools are properly cleaned before coming into contact with the bearing components.
- Contamination-Controlled Workstations:
Establish contamination-controlled workstations for bearing handling, installation, and maintenance. These areas should have proper ventilation, filtered air, and minimal exposure to external contaminants.
- Proper Lubrication:
Use the correct lubricant in appropriate quantities. Lubricants help create a barrier against contaminants and reduce friction. Regularly inspect and replenish lubrication to maintain its effectiveness.
- Regular Inspections:
Implement a routine inspection schedule to monitor the condition of the bearings. Look for signs of contamination, wear, and damage. Address any issues promptly to prevent further damage.
- Training and Education:
Train personnel on proper handling, installation, and maintenance practices to minimize the risk of contamination. Educated employees are more likely to take precautions and prevent accidental contamination.
- Environmental Controls:
In sensitive environments, such as clean rooms or medical facilities, implement strict environmental controls to minimize the presence of contaminants that could affect bearing performance.
- Regular Cleaning and Maintenance:
Perform regular cleaning and maintenance of machinery and equipment to prevent the buildup of contaminants. Keep bearings protected during maintenance to prevent debris from entering during the process.
- Selection of Suitable Bearings:
Choose bearings that are specifically designed for the application’s environmental conditions. Some bearings have advanced sealing options or specialized coatings that enhance contamination resistance.
By implementing these precautions, industries can significantly reduce the risk of contamination in ball bearings, ensuring smooth operation, extended bearing life, and enhanced equipment reliability.
How does Lubrication Impact the Performance and Lifespan of Ball Bearings?
Lubrication plays a critical role in the performance and lifespan of ball bearings. Proper lubrication ensures smooth operation, reduces friction, minimizes wear, and prevents premature failure. Here’s how lubrication impacts ball bearings:
- Friction Reduction:
Lubrication creates a thin film between the rolling elements (balls) and the raceways of the bearing. This film reduces friction by separating the surfaces and preventing direct metal-to-metal contact. Reduced friction results in lower energy consumption, heat generation, and wear.
- Wear Prevention:
Lubricants create a protective barrier that prevents wear and damage to the bearing’s components. Without proper lubrication, the repeated rolling and sliding of the balls against the raceways would lead to accelerated wear, surface pitting, and eventual failure.
- Heat Dissipation:
Lubricants help dissipate heat generated during operation. The rolling elements and raceways can generate heat due to friction. Adequate lubrication carries away this heat, preventing overheating and maintaining stable operating temperatures.
- Corrosion Resistance:
Lubrication prevents moisture and contaminants from coming into direct contact with the bearing’s surfaces. This helps protect the bearing against corrosion, rust, and the formation of debris that can compromise its performance and longevity.
- Noise Reduction:
Lubricated ball bearings operate quietly because the lubricant cushions and dampens vibrations caused by the rolling motion. This noise reduction is crucial in applications where noise levels need to be minimized.
- Seal Protection:
Lubricants help maintain the effectiveness of seals or shields that protect the bearing from contaminants. They create a barrier that prevents particles from entering the bearing and causing damage.
- Improved Efficiency:
Properly lubricated ball bearings operate with reduced friction, leading to improved overall efficiency. This is especially important in applications where energy efficiency is a priority.
- Lifespan Extension:
Effective lubrication significantly extends the lifespan of ball bearings. Bearings that are properly lubricated experience less wear, reduced fatigue, and a lower likelihood of premature failure.
- Selection of Lubricant:
Choosing the right lubricant is essential. Factors such as speed, temperature, load, and environmental conditions influence the choice of lubricant type and viscosity. Some common lubricant options include grease and oil-based lubricants.
- Regular Maintenance:
Regular lubrication maintenance is crucial to ensure optimal bearing performance. Bearings should be inspected and relubricated according to manufacturer recommendations and based on the application’s operating conditions.
In summary, proper lubrication is essential for the optimal performance, longevity, and reliability of ball bearings. It reduces friction, prevents wear, dissipates heat, protects against corrosion, and contributes to smooth and efficient operation in various industrial and mechanical applications.
editor by CX 2024-04-16