Double Row Full Complement Cylindrical Roller Bearings
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Understanding Double Row Full Complement Cylindrical Roller Bearings
AMIGO’s Double Row Full Complement Cylindrical Roller Bearings are rated for remarkably high axial loads and small bearing sizes. Features full complement of cylindrical rollers to increase the efficiency of the bearing structures and are recommended for the application in heavy machinery in steel, mining and automotive industries. One of the major benefits of AMIGO’s Double Row Full Complement Cylindrical Roller Bearings is that they are compatible with SKF, FAG and NTN bearing types.
Features and benefits
- Maximum Load Capacity: Configuration with two rows of full rollers complement increases the radial load capacity.
- Space-Saving Features: Built-in without a cage provides more rollers, making this an ideal space-saving solution for heavy-duty use.
- Long-Lasting Construction: Constructed using premium material for harsh conditions to prolong its lifetime and usefulness.
Temperature Limits
The permissible operating temperature for cylindrical roller bearings can be limited by:
- The Dimensional Stability Of The Bearing Rings And Rollers
- The Seals
- The Lubricant
Cylindrical roller bearings are heat stabilized up to 150 °C (300 °F) .
Applications
- Steel and Metal Processing: These bearings are important in rolling mills and continuous casting machines as they support the extreme radial loads induced by metal forming processes.
- Heavy Machinery: These bearings are found in cranes, excavators, and loaders and are subjected to heavy loads while supporting large rotating oblique members.
- Oil and Gas Industry: These bearings are applied in drilling rigs and other working oil and gas equipment and withstand extreme radial loads in adverse conditions.
Double Row Full Complement Cylindrical Roller Bearings Size Chart
| Designation | Principal dimensions | Bearing Dimensions Chart Pdf | ||
|---|---|---|---|---|
| d[mm] | D[mm] | B[mm] | ||
| SL045022 | 110 | 170 | 80 | Download |
| NNF5004 | 20 | 42 | 30 | Download |
| NNF5005 | 25 | 47 | 30 | Download |
| NNF5006 | 30 | 55 | 34 | Download |
| NNF5007 | 35 | 62 | 36 | Download |
| NNF5008 | 40 | 68 | 38 | Download |
| NNF5009 | 45 | 75 | 40 | Download |
| NNF5010 | 50 | 80 | 40 | Download |
| NNF5011 | 55 | 90 | 46 | Download |
| NNF5012 | 61 | 95 | 46 | Download |
| NNCF4830 | 150 | 190 | 40 | Download |
Customize bearings to meet your specific needs
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Double Row Full Complement Cylindrical Roller Bearing - Designs and Variants
Double row full complement cylindrical roller bearings are non-separable and have an annular groove and lubrication holes in the outer ring to facilitate lubrication.
- Nncl Design Bearings: The inner ring has three integral flanges, and the outer ring has no flanges. A retaining ring in the outer ring holds the bearing together between the roller rows.
- NNCF Design Bearings: The inner ring has three integral flanges, and the outer ring has one. A retaining ring on the side opposite the integral flange holds the bearing together. The retaining ring should not be loaded axially during operation.
- NNC Design Bearings: Alternative NNC design bearings may consist of a one-piece outer ring with one integral flange and a flange ring.
- NNF Design Sealed Bearings: Held together by a retaining ring
With three integral flanges. One integral central flange must be placed on the outer ring.
Double Row Full Complement Cylindrical Roller Bearings Loads
Equivalent Bearing Loads
The equivalent dynamic bearing load is crucial for evaluating the bearing’s performance under dynamic conditions. It represents a constant radial load that would have the same effect on the bearing’s life as the actual varying load.
Minimum Load
In the operation of cylindrical roller bearings, it is essential to maintain a minimum radial load to ensure proper function and longevity. This minimum load prevents slippage between the rollers and raceways, which can lead to surface damage, increased wear, and premature failure of the bearing.
Dynamic Axial Load Carrying Capacity
Double row and double row full complement cylindrical roller bearings with flanges on both the inner and outer rings can support axial loads up to Fa ≤ 0,25 Fr in addition to radial loads.
The axial load carrying capacity is determined by the lubrication condition, operating temperature and heat dissipation at the roller end / flange contact.
The formulae below are valid for normal operating conditions:
- ΔT ≈ 60 °C between the bearing operating and ambient temperature
- Specific heat loss ≈ 0,5 mW/mm2
- Viscosity ratio κ ≥ 2
Designation System for Double Row Full Complement Cylindrical Roller Bearings
AMIGO rolling bearings are typically designated using a system that includes a base designation, optional prefixes, and suffixes.An example and the applicable options for double-row full complement cylindrical roller bearings are given below.
| Category | Code | Description |
|---|---|---|
| Suffixes - Internal design | CV | Modified internal design, full complement roller set |
| Suffixes - External design (seals, snap ring groove,?etc.) | ||
| ADA | Modified internal design and standard PUR seal (for NNF 50 series) | |
| ADB | Modified internal design and seal (for NNF 50 series) | |
| B | Improved | |
| DA | Modified internal design and standard PUR seal (for 3194.. series) | |
| -2LS | Contact seal on both sides | |
| Suffixes - Cage design | V | Full complement of rollers (no cage) |
| Suffixes - Materials, heat treatment | HB1 | Bainite-hardened inner and outer rings |
| L4B | Bearing rings and rollers black oxidized | |
| Suffixes - Accuracy, clearance, preload, quiet running | CN | Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range |
| H = Reduced clearance range corresponding to the upper half of the actual clearance range | ||
| L = Reduced clearance range corresponding to the lower half of the actual clearance range | ||
| M = Displaced clearance range comprising the upper half of the actual clearance range plus the lower half of the next larger clearance range | ||
| C2 | Radial internal clearance smaller than Normal | |
| C3 | Radial internal clearance greater than Normal | |
| C4 | Radial internal clearance greater than C3 | |
| C5 | Radial internal clearance greater than C4 | |
| Suffixes - Bearing sets, matched bearings | DR | Set of two matched bearings |
| TR | Set of three matched bearings | |
| QR | Set of four matched bearings |
Double Row Full Complement Cylindrical Roller Bearings Catalogue
Look at our complete PDF instruction brochure on Double Row Full Complement Cylindrical Roller Bearings. This PDF provides features, benefits, and required applications so that you can select the best bearing for your application. This catalog is essential for selecting the right bearing for your application, offering full interchangeability with leading brands like SKF, SIGMA, NSK, CRAFT, and FBJ. Download the PDF, as all the essential details are contained in one unified document.
General bearing specifications
| Specification | Details |
|---|---|
| Dimension Standards | Boundary dimensions: ISO 15 |
| HJ angle rings: ISO 246 | |
| Snap rings and grooves: ISO 464 | |
| Locating slots: ISO 20515 | |
| Tolerances | Normal dimensional tolerance |
| P6 run-out | |
| Check availability of P5 or P6 tolerance class for bearings in the 10 series | |
| Values: ISO 492 | |
| Radial Internal Clearance | Normal, C3 |
| Check availability of other clearance classes | |
| Values: ISO 5753-1 | |
| cylindrical bore | |
| tapered bore | |
| Values are valid for unmounted bearings under zero measuring load. | |
| Axial Internal Clearance | NUP design |
| NJ design with HJ angle ring | |
| 10, 18, 19, 2, 3, 4 series: ≈ the radial internal clearance | |
| 22, 23, 29, 39 series: ≈ 2/3 the radial internal clearance | |
| Permissible Misalignment | 10, 12, 18, 19, 2, 3, 4 series: ≈ 4 minutes of arc |
| 20, 22, 23, 29, 39 series: ≈ 3 minutes of arc | |
| Misalignment increases bearing noise and reduces service life. | |
| Permissible Axial Displacement | Bearings having no flange, or only one integral flange on either the inner or outer ring, can accommodate axial displacement. Displacement of the shaft relative to the housing occurs within these bearings. As a result, there is virtually no increase in friction. |
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Frequently Asked Question
Q: What do you understand by the term Double Row Full Complement Cylindrical Roller Bearings?
A: Double Row Full Complement Cylindrical Roller Bearings, Double Row Bottom Rolling Bearings, or Double Row Full Complement Cylindrical Roller Bearings is are rimed cylindrical roller structure having two rows of cylindrical rollers without a cage for higher radial load carrying capacity.
Q: What are the main advantages of Double Row Full Complement Cylindrical Roller Bearings?
A: The main advantages include improved carrying capacity in a radial direction, simplicity in terms of physical construction and applicability for carrying overloads in a setting where the field is limited in space.
Q: Where are Double Row Full Complement Cylindrical Roller Bearings mostly applicable?
A: Electric motor assembly is a common use for these bearings, as is electrical and power engineering, the automotive industry, agriculture and gardening machinery, steel and metal working, mining, wind energy, and heavy equipment.
Q: How do Double Row Full Complement Cylindrical Roller Bearings differ from single-row variants?
A: In double-row bearings, the capacity is also higher due to the fewer number of rows. There are more rollers per bearing in a double row as compared to a single row; thus, these bearings are more stable and can withstand greater radial loads.
Q: Do Double Row Full Complement Cylindrical Roller Bearings take axial loads?
A: These bearings are used for radial loads but can take some axial loads, although they are generally not designed for that purpose and will not be a good option for use in places with high unidirectional loads.
Q: What is the top speed that double-row full complement cylinder bearings can achieve?
A: Because of a full complement of rollers in rims, these bearings are typically employed in low to moderate speeds since speed limitations in caged designs are not readily achievable.
Q: Are there bearing types similar to double-row full complement cylinder roller bearings, as long as they do not have any interchangeable bearings?
A: Yes, these bearings can be regarded as interchangeable with those of other manufacturers, particularly SKF, FAG, and NTN, as long as the dimension and the load is the same.
Q: What characteristics would influence your decision to choose Double Row Full Complement Cylindrical Roller Bearings?
A: Notable factors are the load-bearing capacity, the necessary operational speed, spatial limitations, the nature of the environment, and currently operating machines.
Q: What are the standard procedures involved in using Double Row Full Complement Cylindrical Roller Bearings?
A: In terms of performance, routine lubrication and certain inspections need to be practiced mainly in high-load and extreme conditions to ensure the long life of the bearing.
Q: In which applications does Double Row Full Complement Cylindrical Roller Bearings help the most?
A: They are most advantageous in applications such as rolling mills, heavy machinery and gearboxes where a high radial load capacity and compactness are necessary.