ZH 
EN Raceway system bearing (LRL) – Overview
Product description
Comparison with wire race bearings
Application Examples
Raceway system bearing (LRL) design series
Tolerances
Rigity
Load ratings
Product table
Product description
IBO raceway bearings (LRL) with bearing rings made of light metal proven in many times, have high load ratings, can be used in a diverse application and are very economical. Due to their construction, they carry radial, axial and tilting moment loads with one bearing location. Therefore, bearings with radial and axial bearing combinations can often be reduced to just one bearing location. This reduces the effort and costs for the design of the connecting construction and the installation of the bearings in some cases considerably.
Using high-tensile aluminium alloys for the ring material and steel forthe raceway rings allows to achieve a load rating capacity similar toconventional steel bearings – combined with the additional advantageof a weight reduction of up to 60%.
Furthermore, IBO raceway ring bearings are particularly suitable for:
- Shock loads
- Shock load vibrations
- High and low operating temperatures
- Uniform low frictional torque
- High demands on corrosion-free requirement
IBO raceway bearings are sealed and pre-greased with a high-quality lubricating grease and can be re-lubricated via grease nipples. The standard designs have no gears. Of course, all series can be designed to specific project requirements with internal or external gears.
In the standard version, the bearing rings are anodized according to DIN 17611.
Comparison with wire race bearings
IBO has the bearing category of race bearings (LRL) in its product range since 2012 and has been continuously developing the following designs since then:
- Race – crossed roller bearing (LRL-K)
- Race – four-point contact bearing (LRL-V)
- Race – Angular contact roller bearing (LRL-S2)
- Race – Axial / Radial roller bearing (LRL-A2R)
In order to meet market requirements and differentiate itself from its market competitors, IBO has focused primarily on possible configurations (designs and dimensions) and manufacturing processes.
In the past, this bearing category is often referred to as wire race bearings or wire race roller bearings or wire race ball bearings.
IBO bearings differ from wire race bearings because they use raceway rings instead of wires. This offers technical as well as economic advantages for customers.
Raceway rings as well as wires transmit the external load of the bearing (LRL), such as
- Axial load
- Radial load
- Tilting moments
Our customers use our LRL bearings at critical bearing positions where the installation space is usually very limited. Space is usually severely limited. Therefore, the power density for the application represents a decisive success factor for our customers. The term power density is defined as realising a maximum load rating in the smallest possible installation space and thus enabling customers to transmit a high load in a small installation space.
Due to the market demand for a high power density of our bearings (LRL) and an increasing number of different configurations with lower quantities, IBO has developed a manufacturing process for the bearing rings that enables it to react flexibly to the market requirements in the customer’s project without increasing the manufacturing costs for the specific project or having to realise minimum quantities.
This is a significant difference to wire race bearings, which are manufactured from drawn material, which requires a high purchase quantity of raw material for the wires. This purchase quantity of raw material severely limits the possible variety in configurations.
The advantages described are illustrated in the below figure as done for a customer project for an RCWS. In this project, the customer has set the requirements to increase the loads to be transmitted by more than 30% in the existing installation space for the raceway bearing as well as a defined interface to the adjacent construction, due to increase in calibre.
wire race roller bearing LRL-K
The customer requirements could be implemented due to the freely configurable usable raceways of the raceway rings.
In this specific case, the usable raceway was increased from the initial value x to the new raceway width y by 36.5% without having to modify the required installation space. Due to the increase in the usable raceway width, the load ratings of the raceway bearing (LRL-K) could be increased by:
- Static load rating: 36.8%
- Dynamic load rating: 27.6%
This measure made it possible to implement the customer’s requirement without additional expense and without affecting availability.
Application examples
Raceway System Bearings (LRL) for patient beds
For a medical technology application, IBO developed a bearing solution (LRL) for a motor driven patient bed. This is a high-rigidity track system, which enables a wide range of different positions. Furthermore, some functional features, such as the sliding guide of the position system, were integrated into the bearing geometry. In addition to the bearing design a bearing lifetime calculation was part of the scope of services. For the successful project work the IBO development process according to the APQP standard was utilized.
Patient beds for MRT
Raceway System – crossed roller bearing (LRL-K)
Requirement/span
- High rigidity
- High repetition accuracy
- Specified installation space
- Service or bearing lifetime calculation
Solution
- Raceway System – Crossed Roller Bearing
- Design of the Raceway System LRL
- Tailor-made geometry designed and adapted to the specifications of the customers given connecting construction e.g. the locking function integrated into the bearing
Benefit
- Ready-to-install components
- Total cost of ownership
- Fulfillment of the specification requirements
Raceway bearing (LRL) for radar and antenna systems
For an application in the field of radar and satellite systems, IBO developed a bearing solution (LRL) for the main bearing point of the antenna. Our customer placed high demands on a uniform friction torque even under the influence of temperature fluctuations. Furthermore, the drive for the rotational movement had to be integrated. The running accuracy of the bearing (LRL) has a direct influence on the signal transmission. For this reason, the limit for the running accuracy has been severely restricted. Our APQP development process has proven its value over the course of the project and the cooperation with our customer.
Side pivot bearing for radar & antenna systems
Raceway two row angular roller bearing (LRLS2)
Requirement
- Uniform frictional torque, even with temperature fluctuations
- High running accuracy
- Integration of a drive option for the main bearing point
Solution
- Raceway two row angular roller bearing (LRLS2)
- Inner ring gear
- Honed aluminum bearing rings
Benefit
- Fulfillment of the running accuracy, including the inner ring gear
- Ready-to-install component, which is easy to assemble
- High tilting rigidity
Raceway bearing (LRL) for (remote) weapon stations
For the defense industry IBO designed, developed and manufactured a bearing solution (LRL) for a remote-controlled-weapon-station. One of the main requirements of the customer was to develop a solution that meets the high loads and the most diverse climate conditions. In addition, requirements from the various AQAP standards had to be met, such as the double row contact angle roller bearing (LRLS2) with the appropriate surface treatment and a corrosion-resistant track system. This was designed and fulfilled according to the customers load collective requirements.
Side pivot bearing for radar & antenna systems
Raceway two row angular roller bearing (LRLS2)
Requirement
- Environmental requirements according to AQAP specification
- High running accuracy
- Uniform frictional torque
- High tilting rigidity
Solution
- Raceway two row angular roller bearing (LRLS2), with a corrosion-resistant raceway system
- Sealing concept and surface treatment of the bearing rings in accordance with environmental conditions
- Bearing rings made of aluminum alloy to reduce the moving mass
Benefit
- Mass movement reduction
- Compliance with environmental requirements
- Performance requirement increasement towards the customer component
Raceway system bearing (LRL) design series
LRLS2-06 design series
The main product characteristics are as follows:
- Compact design
- High rigidity
- Constant frictional torque with uneven connection construction
- Transmission of tilting moments
- High static load rating
- High axial load rating
- High radial load rating
LRLV-10 design series
This series is relevant in need for the following product features:
- Low frictional torque
- Transmission of tilting moments
- High sensitivity to friction due to uneven adjacent construction
LRLV-10
LRLK-10 design series
The main product features ties of the LRLK-10- series are as follows
- Transfer of torque load
- Installation space for drive and measuring gears
- High rigidity
- Equality of the frictional torque depending on the evenness of the connecting construction
LRLK-10
LRLR-08 design series
In contrast to the three before mentioned series, which are a 1-bearing solution, the LRLR-08 series is a 2-bearing solution. With a 2-bearing solution, the LRLR-08 bearing can be used as a floating bearing and offers the following product features:
- High rigidity in the load direction
- Low frictional torque
- Floating bearing function, with axial displacement from the central position
LRLR-08
Raceway bearing (LRL) – Tolerances
Running accuracy
The following tables show the associated concentricity and axial run-out depending on the respective running circle diameter. The running accuracies apply to the rotating inner or outer ring.
Ring bearing (LRL) – Concentricity
Ring bearing (LRL) – Axial running accuracy
Installation tolerances
The following table shows the tolerance of the bearing height H depending on the design:
| Height tolerances [mm] Series | Standard Version (0) | Restricted clearance (1) | Increased clearance (2) |
|---|---|---|---|
| LRLV-10 | ±0.30 | ±0.45 | ±0.50 |
| LRLK-10 | ±0.40 | ±0.55 | ±0.60 |
| LRLS2-06 | ±0.50 | ±0.60 | ±0.70 |
The bolt circle diameters for the mounting holes in the respective inner and outer ring are tolerated in accordance with DIN ISO 273-m and shown in the table below:
| Bolt circle diameters [mm] From | Till | Maximum |
|---|---|---|
| 0 | 500 | ±0.50 |
| 500 | 1,200 | ±0.60 |
Raceway system bearing (LRL) – Rigidity
The rigidity values of the race way system are shown in the tables below
- Axial rigidity
- Radial s rigidity
- Tilting rigidity
Relate explicitly to the respective race way system, regardless of the connecting construction. These tables are used to compare the 3 different series for the product selection of a 1-bearing solution.
The calculation of the rigidity values is based on the standard version 0.
Ring Bearing (LRL) – Axial stiffness
Ring Bearing (LRL) – Radial stiffness
Ring Bearing (LRL) – Tilt stiffness
Raceway System Bearing (LRL) – Load ratings
The following tables compare the respective load ratings of the three series for the 1-bearing solution:
- Radial dynamic load rating
- Axial dynamic load rating
- Radial static load rating
- Axial static load rating
The calculations of the load ratings are based on the standard version (0). The load ratings differ for versions (1) and (2); these can be provided on request.
Ring Bearing (LRL) – Radial dynamic load rating
Ring Bearing (LRL) – Axial dynamic load rating
Ring Bearing (LRL) – Radial static load rating
Ring Bearing (LRL) – Axial static load rating
Raceway System Bearing (LRL) – Product table
Size tables
You will find the CAD Modells to download: