Needle Roller Bearings With Machined Rings
AMIGO needle roller bearings with machined rings are made of carbon chromium bearing steel. AMIGO supplies these bearings with or without flanges on the outer ring, in a wide range of series and sizes. AMIGO also supplies them with or without an inner ring.
- Low cross section
In applications where less space is available, needle roller bearings offer a very compact solution. - High load carrying capacity
Despite their low cross sectional height, they have a high load carrying capacity. - Separable design
The possibility of assembling inner and outer rings separately permits interference fits for shaft and housing and also enables easy maintenance inspections . - High stiffness
Owing to their large number of small-diameter rollers, needle roller bearings with machined rings have high stiffness. - Accommodate axial displacement
Needle roller bearings with machined rings can accommodate axial displacement. When using raceways on the shaft, the displacement distance is not limited by the bearing.
AMIGO Needle roller bearings with machined rings are widely used in various industries. Their availability matches their versatility across numerous applications in a wide range of designs, variants, and sizes. Examples of applications include:
- Automotive Industry
- Agriculture
- Construction Equipment
- Machine Tools
- Aerospace Industry
- Mining and Quarrying
- Railways
- Industrial Gearboxes
Needle Roller Bearings With Machined Rings - Designs and Variants
Bearings with Flanges
Bearings with flanges are available either open (without seals) or sealed on one or both sides, and can be used with or without an inner ring. Bearings with smaller diameters (D ≤ 17 mm, Fw ≤ 10 mm) are fitted with non-separable closure rings that act as flanges, with annular grooves and lubrication holes in the outer ring. Larger bearings, except for RNA 69 and NA 69 series, are typically single row and may include multiple lubrication points. Bearings with flanges are designed as non-separable units, with the roller and cage assembly forming an integrated structure.
Bearings without Flanges
Bearings without flanges are separable, allowing flexibility in mounting the outer ring, needle roller and cage assembly, and inner ring either together or independently, depending on the arrangement design. These parts may be mounted with the outer ring, shaft, or inner ring as the final step in assembly. The bearings are usually designed with one needle roller and cage assembly. Some wider sizes incorporate two needle roller and cage assemblies adjacent to each other with an annular groove and lubrication hole in the outer ring.
Bearings with an Inner Ring
Bearings with an inner ring are commonly used when the shaft cannot be hardened and ground. These bearings limit the axial displacement of the shaft relative to the housing, but this can be adjusted by using a wider inner ring if necessary. They are particularly useful in situations where precise alignment is critical and there is limited space for axial movement.
Bearings without an Inner Ring
Bearings without an inner ring provide a compact solution for applications where the shaft can be hardened and ground. These bearings allow for a larger shaft diameter and a stiffer bearing arrangement than bearings with inner rings. By machining the shaft raceways to precise tolerances, the bearing achieves better load distribution and longevity, making it ideal for compact and robust bearing arrangements.
Needle Roller Bearings With Machined Rings Size Chart
| Designation | Fw [mm] | D [mm] | C [mm] |
|---|---|---|---|
| NK 60/25 | 60 | 72 | 25 |
| NK 60/25 TN | 60 | 72 | 25 |
| NK 60/35 | 60 | 72 | 35 |
| NKS 60 | 60 | 80 | 28 |
| RNAO 60X78X40 | 60 | 78 | 40 |
| RNA 4911 | 63 | 80 | 25 |
| RNA 6911 | 63 | 80 | 45 |
| NK 65/25 | 65 | 75 | 25 |
| NK 65/35 | 65 | 75 | 35 |
| NKS 65 | 65 | 85 | 28 |
| NK 68/25 | 68 | 82 | 25 |
| NK 68/35 | 68 | 82 | 35 |
| RNA 4912 | 68 | 85 | 25 |
| RNA 6912 | 68 | 85 | 45 |
| NK 70/25 | 70 | 90 | 25 |
| NK 70/35 | 70 | 90 | 35 |
| NKS 70 | 70 | 95 | 28 |
| RNA 4913 | 72 | 90 | 25 |
| RNA 6913 | 72 | 90 | 45 |
| NK 73/25 | 73 | 85 | 25 |
| NK 73/35 | 73 | 85 | 35 |
| NKS 75 | 75 | 95 | 28 |
| NK 75/25 | 75 | 92 | 25 |
| NK 75/35 | 75 | 92 | 35 |
| NKS 75 | 75 | 100 | 28 |
| NK 80/25 | 80 | 100 | 25 |
| NK 80/35 | 80 | 100 | 35 |
| RNA 4914 | 80 | 100 | 45 |
| RNA 6914 | 80 | 110 | 45 |
Recommended Reading
Frequently Asked Questions (FAQs)
Q: How do needle roller bearings with machined rings differ from drawn cup bearings?
A: Unlike drawn cup bearings, needle roller bearings with machined rings have a rigid, machined outer ring, offering superior strength, precision, and durability, especially in high-load or high-speed applications.
Q: What are the typical applications of needle roller bearings with machined rings?
A: These bearings are widely used in industries such as automotive, construction equipment, agricultural machinery, and industrial transmissions, where compact design and high load-carrying capacity are essential.
Q: Can needle roller bearings with machined rings handle axial loads?
A: While these bearings primarily handle radial loads, certain designs with integrated thrust bearings can also manage axial loads, ensuring versatility in demanding applications.
Q: What are the material specifications for needle roller bearings with machined rings?
A: They are typically made of high-strength, through-hardened bearing steel, such as AISI 52100, for optimal wear resistance and performance in demanding environments.
Q: How do needle roller bearings with machined rings improve machine performance?
A: These bearings reduce friction and enhance the overall mechanical efficiency, enabling smoother rotation, longer equipment life, and reduced maintenance costs in high-load applications.
Q: Are needle roller bearings with machined rings available in custom sizes?
A: Yes, many manufacturers offer customized sizes and configurations to meet specific application needs, allowing for better performance in non-standard machinery designs.
Q: What are the sealing options for needle roller bearings with machined rings?
A: Sealed versions are available to protect against contamination from dust and dirt, increasing bearing life and reducing the need for frequent maintenance in harsh environments.
Q: How do I select the correct size of needle roller bearings with machined rings for my application?
A: Selecting the right size depends on factors like load capacity, speed, and operating environment. Consulting with the manufacturer’s technical specifications and load rating charts is essential for proper selection.
Q: Can needle roller bearings with machined rings be used in high-temperature environments?
A: Some designs are suitable for high-temperature applications, especially when paired with appropriate lubricants and materials that can withstand thermal expansion and maintain performance at elevated temperatures.