Product Description

N NU NUP NJ NF Series Engineering Machinery Parts Cylindrical Roller Bearing NU2232EM NU2334EM NU2336EM NU2338EM NU2340EM NU2344EM Roller Bearing NU2348EM  
 

Model

All Standard and Non Standard
Structure Single row    
Double rows
Four rows
Precision Rating P0,P6,P5,P4,P2(ABEC1,ABEC3,ABEC5,ABEC7,ABEC9)
Clearance C2,C0,C3,C4,C5
Viberation Level V1,V2,V3,V4
Material GCr15/GCr15SiMn
Application

Widely used in metallurgy, mining, petroleum, chemical, coal, cement, paper, 

windpower, heavy machinery, enginnering machinery, port machinery and other

 industries. 

Delivery time 1)3-5days for samples
2)10-15days
Payment terms 1)30%TT in advance,70%balance has to be paid before first shipment.
2)100%LC at sight
3)Western Union
4)Paypal
5)other payment terms depend on our discussion

 

Images

 

 

Type

Cylindrical Roller Bearing

Model

NN3044-AS-K-M-SP

Brand

YNR/OEM

d (mm)

220mm

Material

Chrome steel 

D (mm)

340mm

Type

Open/Seal

B (mm)

90mm

Precision rate

P0, P6, P5, or as requested

 

 

 Applicable Industries    Hotels, Garment Shops, Building Material Shops, Manufacturing Plant, Machinery Repair Shops, Food & Beverage Factory, Farms, Restaurant, Home Use, Retail, Food Shop, Printing Shops,

Company Profile

 

CONTINUOUS AND STABLE DELIVERY OF PRODUCTS.
 

Packaging & Shipping

 

FAQ

 Q:Do you accept ODM&OEM orders?
A: Yes, we provide ODM&OEM services to worldwide customers, we are CZPT to customize housings in different styles, and sizes in
different brands, we also customize packaging box as per your requirements.

Q:Do you offer free samples?
A: Yes we offer free small samples to distributors and wholesalers, pls note,if your bearings are bigger,we will send you same
materials/same brands as for sample.however customers should bear freight.
We DO NOT offer free samples to end users.

Q:What's the MOQ?
A: MOQ is 10pcs for standardized products; for customized products, MOQ should be negotiated in advance.

Q:How long is the lead time?
A: Normally lead time is about 3-7days,if it is customized order ,the lead time will be reconfirmed, about 10-15days.
 

Q:How to place orders?
A: 1. Email us the model, brand and quantity, consignee information, shipping way and payment terms;
2. Proforma Invoice made and sent to you;
3. Complete Payment after confirming the PI;
4. Confirm Payment and arrange production.

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Rolling Body: Roller Bearings
The Number of Rows: Single
Outer Dimension: Small and Medium-Sized (60-115mm)
Material: Bearing Steel
Spherical: Non-Aligning Bearings
Load Direction: Radial Bearing
Samples:
US$ 10/Piece
1 Piece(Min.Order)

|
Request Sample

Customization:
Available

|

Customized Request

cross roller bearing

What are the signs of wear or damage in cross roller bearings, and when should they be replaced?

Identifying signs of wear or damage in cross roller bearings is crucial for ensuring the proper functioning and reliability of machinery. Regular inspection and maintenance can help detect these issues early and prevent potential failures. Here are the common signs of wear or damage in cross roller bearings and guidelines for determining when they should be replaced:

  • Abnormal Noise:
  • Unusual noises such as grinding, clicking, or rumbling sounds during operation can indicate bearing wear or damage. These noises often result from rough or pitted bearing surfaces, insufficient lubrication, or the presence of foreign particles. If abnormal noise is observed, it is advisable to inspect the bearing and consider replacement if necessary.

  • Increased Vibration:
  • An increase in vibration levels during equipment operation can indicate bearing wear or misalignment. Excessive vibration may lead to premature wear of the bearing surfaces and other components. If the vibration levels exceed acceptable limits or show a significant increase compared to normal operation, a thorough inspection should be conducted to determine the cause. If bearing wear or damage is identified as the source, replacement is recommended.

  • Irregular Movement or Stiffness:
  • If the cross roller bearing exhibits irregular movement, stiffness, or resistance during rotation, it may be a sign of wear or damage. This can result from insufficient lubrication, contamination, or excessive internal clearance. Any noticeable change in the smoothness of rotation or resistance to movement should be investigated, and replacement should be considered if the bearing is found to be compromised.

  • Visible Damage:
  • Visual inspection of the cross roller bearing is essential to identify visible signs of damage. These can include chipped or cracked bearing surfaces, excessive wear, corrosion, or deformation. If any visible damage is detected, the bearing should be replaced promptly to prevent further deterioration and potential system failure.

  • Lubrication Issues:
  • Problems related to lubrication can affect the performance and lifespan of cross roller bearings. Insufficient or contaminated lubricant can lead to increased friction, wear, and heat generation. If there are signs of inadequate lubrication (e.g., dry or discolored bearing surfaces) or if contamination is observed (e.g., presence of dirt, debris, or water), the bearing should be inspected, and appropriate measures such as relubrication or replacement should be taken.

  • Operational Conditions:
  • The operational conditions and service life of cross roller bearings vary depending on factors such as load, speed, temperature, and environment. Bearings that are subjected to heavy loads, high speeds, extreme temperatures, or harsh environments may experience accelerated wear or damage. Regular monitoring and periodic replacement based on the manufacturer's recommendations and guidelines for specific operating conditions can help ensure the reliability and longevity of the bearing.

It is important to note that the signs of wear or damage mentioned above are general indicators, and the specific conditions and requirements of each application may vary. Therefore, it is advisable to consult the manufacturer's documentation and guidelines for the cross roller bearing being used to determine the recommended inspection intervals and replacement criteria based on the specific operating conditions.

In summary, signs of wear or damage in cross roller bearings include abnormal noise, increased vibration, irregular movement or stiffness, visible damage, and lubrication issues. The appropriate time for replacement depends on the severity of the wear or damage, as well as the specific operational conditions of the bearing. Regular inspection, adherence to maintenance schedules, and following manufacturer recommendations are crucial for ensuring the optimal performance and longevity of cross roller bearings.

cross roller bearing

How do temperature variations and environmental conditions impact the performance of cross roller bearings?

Temperature variations and environmental conditions can significantly impact the performance of cross roller bearings. These factors affect the bearing's materials, lubrication, and overall operation, and can lead to various performance issues. Here's a detailed look at how temperature variations and environmental conditions impact cross roller bearings:

  • Material Expansion and Contraction:
  • Temperature variations cause materials to expand or contract. Cross roller bearings typically consist of different components made of various materials, such as steel, aluminum, or plastics. When exposed to temperature changes, these materials expand or contract at different rates, which can affect the internal clearances and preload of the bearing. Excessive expansion or contraction can lead to changes in bearing tolerances, increased friction, and potential issues with fitting and alignment.

  • Lubrication Performance:
  • Temperature variations can impact the performance of lubricants used in cross roller bearings. Lubricants have specific viscosity characteristics at different temperatures. High temperatures can cause lubricants to thin out, leading to reduced film thickness and increased friction. Conversely, low temperatures can cause lubricants to thicken, making it challenging for them to flow properly and provide sufficient lubrication. Inadequate lubrication due to temperature variations can result in increased wear, higher operating temperatures, and potential bearing failure.

  • Thermal Expansion of Bearing Components:
  • Temperature variations can also cause the bearing components themselves to expand or contract. This can affect the internal clearances and preload within the bearing. If the temperature rises, the bearing components may expand, leading to reduced internal clearances and potential binding or increased friction. On the other hand, lower temperatures can cause the bearing components to contract, resulting in increased internal clearances and potential play or reduced stiffness. These changes in clearances and preload can impact the precision, smoothness, and overall performance of the cross roller bearing.

  • Corrosion and Rust:
  • Environmental conditions, including moisture, humidity, and exposure to corrosive substances, can lead to corrosion and rust formation on the bearing surfaces. Corrosion can degrade the bearing's performance by increasing friction, causing surface damage, and reducing the effectiveness of lubrication. In severe cases, corrosion can lead to pitting, spalling, or premature failure of the cross roller bearing. Proper sealing, lubrication, and protection against corrosive elements are essential to mitigate the impact of environmental conditions on the bearing's performance.

  • Contamination and Particle Ingress:
  • Environmental conditions can introduce contaminants, such as dust, dirt, or debris, into the bearing system. These particles can enter through open seals or shields or when the machine is operating in dusty or dirty environments. Contamination can cause abrasive wear, increase friction, and compromise the bearing's precision and reliability. The presence of contaminants can also accelerate lubricant degradation and lead to lubricant contamination, further impacting the bearing's performance.

  • Operating Life and Durability:
  • Temperature variations and harsh environmental conditions can affect the operating life and durability of cross roller bearings. High temperatures can accelerate the aging and degradation of bearing materials, lubricants, and seals, reducing their overall lifespan. Exposure to extreme environmental conditions, such as high humidity or corrosive substances, can lead to premature wear and failure. Proper selection of materials, lubrication, and protective measures, such as seals and shields, is crucial to ensure the longevity and reliability of cross roller bearings in challenging operating environments.

In summary, temperature variations and environmental conditions have a significant impact on the performance of cross roller bearings. They can affect the materials, lubrication, internal clearances, and overall operation of the bearing. It is essential to consider these factors during the design, selection, and maintenance of cross roller bearings to ensure optimal performance, reliability, and longevity in various operating environments.

cross roller bearing

What are the common applications and industries where cross roller bearings are essential components?

Cross roller bearings find essential use in various applications and industries that require high precision, rigidity, and compact design. These bearings offer excellent rotational accuracy and load-carrying capacity, making them suitable for a wide range of demanding applications. Here's a detailed overview of the common applications and industries where cross roller bearings are essential components:

  • Robotics and Automation:
  • Cross roller bearings are extensively used in robotics and automation systems. They provide precise rotational motion and support heavy loads with minimal deflection. Cross roller bearings are commonly found in robot joints, robotic arms, manipulators, and other robotic mechanisms that require accurate positioning and smooth motion control.

  • Machine Tools:
  • In the machine tool industry, cross roller bearings are vital components in various equipment such as milling machines, grinding machines, lathes, and machining centers. These bearings provide the necessary rigidity and accuracy for spindle rotation, table movement, and other critical functions in machine tools.

  • Medical and Healthcare:
  • The medical and healthcare sector relies on cross roller bearings for a range of applications. They are used in medical imaging equipment, including CT scanners, MRI machines, and X-ray systems, where precise and smooth movement is crucial. Cross roller bearings are also employed in surgical robots, patient tables, examination chairs, and other medical devices that require high precision and reliability.

  • Aerospace and Aviation:
  • Cross roller bearings play a significant role in the aerospace and aviation industry. They are utilized in aircraft landing gear systems, control surfaces, engine components, and satellite mechanisms. The compact design and high load-carrying capacity of cross roller bearings make them well-suited for aerospace applications that demand reduced weight and increased efficiency.

  • Semiconductor Manufacturing:
  • In semiconductor manufacturing, cross roller bearings are critical for precise wafer handling and positioning. They are used in wafer handling robots, inspection systems, lithography machines, and other semiconductor equipment. The high rigidity and low friction of cross roller bearings ensure accurate alignment and positioning of wafers during the manufacturing process.

  • Optical and Precision Instruments:
  • Cross roller bearings are extensively employed in optical and precision instruments, including telescopes, microscope stages, coordinate measuring machines (CMMs), and optical inspection systems. These bearings provide stable and smooth motion control, allowing for accurate observations, measurements, and alignments in these instruments.

  • Industrial Machinery:
  • Various industrial machinery and equipment rely on cross roller bearings for their critical operations. They are used in printing machines, packaging equipment, textile machinery, industrial robots, and assembly lines. Cross roller bearings provide the necessary precision, load capacity, and reliability required in these industrial applications.

  • Renewable Energy:
  • In the renewable energy sector, cross roller bearings are utilized in wind turbines and solar tracking systems. They enable the precise rotation and positioning of wind turbine blades and solar panels, ensuring optimal energy capture and conversion. Cross roller bearings contribute to the efficiency and reliability of renewable energy generation.

In summary, cross roller bearings are essential components in a wide range of applications and industries. They are commonly found in robotics and automation, machine tools, medical and healthcare equipment, aerospace and aviation systems, semiconductor manufacturing, optical and precision instruments, industrial machinery, and renewable energy systems. The unique characteristics of cross roller bearings make them indispensable for achieving accurate motion control, high load capacity, and long-term reliability in these demanding applications.

China wholesaler Grade Cross Rolling Crossed Cylindrical Roller Bearing for Robot   ball bearingChina wholesaler Grade Cross Rolling Crossed Cylindrical Roller Bearing for Robot   ball bearing
editor by CX 2024-04-15