High-Capacity Cylindrical Roller Bearings
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Understanding High-Capacity Cylindrical Roller Bearings
The AMIGO high-capacity cylindrical roller bearings combine the strong load-bearing capacity of full complement bearings with the high-speed potential of caged bearings. These AMIGO bearings are designed to be compatible with well-known brands such as SKF, SIGMA, NSK, CRAFT, and FBJ, which are commonly used for industrial gearboxes, wind turbine gearboxes, and mining equipment, thus ensuring consistent performance and reliability.
Features and benefits
- High load-carrying capacity：The cage bars are shifted in relation to the roller pitch diameter, allowing the rollers to be positioned closer together, thereby accommodating extra rollers (refer to figures 1-4).
- High stiffness: The enhanced radial stiffness results from the increased number of rollers.
- High-speed Capability: The cage designs are tailored for high velocities, swift accelerations, and maximum loads.
Temperature Limits
Several factors may limit the permissible range of operating temperature for cylindrical roller bearings. They include:
- The dimensional consistency of roller bearings and rings
- The kind of cage that is employed
- The type of lubrication used
Cylindrical roller bearings can heat-stabilize up to 150 °C (300 °F).
Applications
- Automotive Sector: Utilized in gearboxes, transmissions, and differentials where robust radial load support is vital.
- Industrial Machinery: Employed in heavy-duty equipment such as presses, compressors, and conveyor systems.
- Aerospace Field: Integral in aircraft engines and landing gear systems for their capacity to endure high loads and stress.
High-Capacity Cylindrical Roller Bearing Size Chart
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High-Capacity Cylindrical Roller Bearings - Designs and Variants
The three basic types and variations of high-capacity cylindrical roller bearings are available.
- Inner ring-centered cage Bearings: These are used for the shaft’s one-way axial location and enable the shaft to move axially relative to the housing in the opposite direction.Can be supplied without an outer ring when the outer raceway is integrated into the application (Raceways on shafts and in housings)
- Outer ring-centered cage Bearings： These are used for the shaft’s one-way axial location and enable the shaft to move axially relative to the housing in the opposite direction.
Can be supplied without an inner ring when the inner raceway is integrated into the application (Raceways on shafts and in housings) - Separable bearing with an inner ring raceway-centred Cage:
It allows axial movement of a rotating member concerning its stationary support
Can be separated, i.e., outer ring with the roller and cage assembly from the inner ring), which simplifies fitting/ removal, especially where both rings must have a tight fit.
High-Capacity Cylindrical Roller Bearings Loads
Permissible Axial Loads
- Reference Speed: This speed provides a quick assessment of the bearing's speed capabilities from a thermal perspective, helping users understand how the bearing performs under typical operating conditions.
- Limiting Speed: This is the maximum mechanical speed at which the bearing can operate without risking damage or failure. It should not be exceeded unless the bearing design and application have been specifically adapted for higher speeds.
Minimum Load for High-Capacity Cylindrical Roller Bearings
Minimum Load: The minimum radial load (FrmF_{rm}) that a bearing should carry to avoid skidding or improper operation can be calculated using the given formula. Ensuring the bearing operates above this minimum load is crucial for maintaining its performance and longevity.
Equivalent Dynamic Bearing Load:
- Non-Locating Bearings: For bearings that only support radial loads without any axial displacement, the equivalent dynamic bearing load (PP) equals the radial load (FrF_r).
- Locating Bearings: For bearings that support both radial and axial loads, the equivalent dynamic bearing load calculation adjusts based on the ratio of axial to radial load (Fa/FrF_a / F_r), with different factors applied depending on the load conditions.
High-Capacity Cylindrical Roller Bearings Dynamic Axial Load Carrying Capacity
High-capacity cylindrical roller bearings with flanges on inner and outer rings can support axial loads up to 50% of the radial load capacity. The axial load-carrying capacity is influenced by lubrication conditions, operating temperature, and heat dissipation at the contact points between the roller ends and flanges.
Critical Conditions for Axial Load Carrying Capacity:
- The operating temperature difference (ΔT) should be around 60°C between the bearing and ambient temperature.
- The specific heat loss should be approximately 0.5 mW/mm².
- A viscosity ratio (κ) of at least 2 is recommended.
- Misalignment should not exceed 1 minute of arc. For higher misalignments, SKF’s engineering service should be consulted.
Designation System for High-Capacity Cylindrical Roller Bearings
The majority of rolling bearings are identified using a structured system, known as the Basic Bearing Designation System. This system typically includes a fundamental designation, possibly accompanied by one or more prefixes and suffixes.
| Category | Code | Description |
|---|---|---|
| Prefixes | L | Separate inner or outer ring of a separable bearing |
| R | Inner or outer ring with roller and cage assembly of a separable bearing | |
| Suffixes - Internal design | EC | Optimized internal design incorporating more and/or larger rollers and with modified roller end / flange contact |
| Suffixes - Cage design | JA | Sheet steel cage, outer ring centred |
| JB | Sheet steel cage, inner ring centred | |
| MH | Machined brass cage, inner ring raceway centred | |
| Suffixes - Materials, heat treatment | L4B | Bearing rings and rollers black oxidized |
| L5B | Rollers black oxidized | |
| L7B | Inner ring and rollers black oxidized | |
| Suffixes - Accuracy, clearance, preload, quiet running | CN | N ormal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced 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 | |
| Suffixes - Other variants | PEX | SKF Explorer bearing, used only when same-sized conventional and SKF Explorer bearings are available |
High-Capacity Cylindrical Roller Bearing Catalogue
Check out the Large Capacity Cylindrical Roller Bearing Discussions, Findings, and Databases in PDF format. The catalog contains detailed specifications, dimensions, and performance data of bearings produced by AMIGO. This catalog is essential to identifying the suitable bearing that interchanges flawlessly with central bearing brands like SKF, SIGMA, NSK, CRAFT, and FBJ. To download the PDF, click here to search for all the necessary information to choose our quality, durable bearings.
General bearing specifications
| Specification | Details |
|---|---|
| Dimension standards | Boundary dimensions: ISO?15 |
| Tolerances | Normal dimensional tolerance |
| P6 run-out | |
| Values | ISO 492 |
| Radial internal clearance | Normal, C3 |
| Check availability of other clearance classes | |
| Values | ISO 5753-1 |
| Values are valid for unmounted bearings under zero measuring load. | |
| Misalignment increases bearing noise and reduces bearing service life, and when it exceeds the guideline value these effects become particularly noticeable. | |
| 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 are high-capacity cylindrical roller bearings?
A: High-capacity cylindrical roller bearings are specialized bearings designed for higher and more concentric loads, which is very useful in many industrial applications.
Q: How do high–capacity cylindrical roller bearings differ from standard cylindrical roller bearings?
A: High-capacity bearings have load-carrying capacity features that result from internal geometry optimization and increased roller numbers, making them withstand greater radial loads.
Q: What are the typical applications for high-capacity cylindrical roller bearings?
A: These bearings are used in heavy-duty applications such as gearboxes, electric motors, pumps, wind turbines, and other high-load-bearing industrial machines.
Q: Can the high capacity cylindrical roller bearings carry axial loads?
A: Yes, they are designed chiefly for radial loads but can also support some limited axial load especially on flanged inner or outer ring configurations.
Q: What are the advantages of high-capacity cylindrical roller bearings in industrial applications?
A: The main advantages are increased load capacity, enhanced reliability, lower work stoppage times, and better service in high-stress environments.
Q: What methods can I use to select the right dimensional parameters of high-capacity cylindrical roller bearings for my application?
A: The size can be considered using the bearing’s load ratings, operating conditions, and dimensional requirements. This can be complemented with the manufacturer’s product tables and/or professional help.
Q: What type of lubrication is suitable for high-capacity cylindrical roller bearings?
A: Oil lubrication is usually preferred for bearings capable of high load and high speed. Grease can be used for moderate conditions within speed limits.
Q: How do I compute the permissible use speed for high capacity cylindrical roller bearings for application?
A: The permissible speed can be calculated from the reference speed, the limiting speed of the bearing, and the operating conditions of the bearing, taking into consideration the type of lubrication used and the design of the bearing.
Q: How can the life of the high-capacity cylindrical roller bearings be extended; what maintenance practices must be followed?
A: Some of the practices that are critical to enhancing the life span of bearings include regular inspection, correct lubrication, temperature check within the bearing’s operating range, correct bearing seating, and so on.
Q: Are high-capacity cylindrical roller bearings acceptable for usage in high-temperature applications?
A: Yes, they can be used in high-temperature applications, provided the right type of lubrication is used and the bearing is designed or chosen for such environments.