Roller Air Bearings As A Replacement For Ball Bearings
For maximum precision, smooth operation and optimum synchronization
With a roller air bearing, you have contactless and therefore friction-free bearings. This is achieved with a thin layer of compressed gas. The air serves as a lubricant that flows out of porous material. This allows you to move your load with high precision, dynamically and smoothly.
In a typical configuration, the roller air bearing is pressed onto the shaft with slight pressure. A housing is used to hold the air roller bearing, which can also have an individual design. You are therefore able to replace your existing roller bearing with an air roller bearing and benefit from the advantages of an air bearing.
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Your advantages of an air bearing
Infinite service life, as maintenance-free.- Fast and smooth movements that do not jerk even at the highest resolution.
- Much more precise positioning is possible with air bearings.
- There is no loss of energy and no source of heat due to friction.
- Free of lubricants or other lubricants.
Features
-
Housing material made of 7075 Al/anodized - Air-permeable graphite material
| Characteristics | Unit | OAVRL13M | OAVRL20M | OAVRL25M | OAVRL40M | OAVRL50M | OAVRL75M |
|---|---|---|---|---|---|---|---|
| ID Ø | mm | 13 | 20 | 25 | 40 | 50 | 75 |
| ID tolerance | mm | +0.01/-0.00 | |||||
| OD Ø | mm +0.00/-0.01 | 44.5 | 70 | 90 | 100 | 110 | 140 |
| Length | mm | 22 | 31.8 | 34.9 | 41.3 | 44.5 | 50.8 |
| Inlet pressure | MPa | 0.28 - 0.68 | |||||
| Air connection | M5 x 0.8 | ||||||
| Axial load | N | 120 | 378 | 689.5 | 822.9 | 778.4 | 1156.5 |
| Radial load max. | N | 28.8 | 100.4 | 127 | 250 | 311.8 | 551.1 |
| Stiffness radial | N/µm | 11 | 23 | 34 | 72 | 110 | 159 |
| Weight | g | 76 | 302 | 498 | 585 | 636 | 1102 |
| Air consumption* | m³/h | 0.346 | 0.53 | 0.668 | 0.958 | 1.113 | 1.64 |
| Concentricity | µm | ±0.025 | |||||
| Speed max. | U/min | >70,000 | >60,000 | >45,000 | >40,000 | >35,000 | >33,000 |
*Applies at temperature 0° C and air pressure 101.325 Pa (1.01325 bar)
Standards and guidelines
REACH- RoHS2
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FAQ
- Can another gas also be used?
- Compressed air is commonly used in industrial applications. Compressed nitrogen is also possible, but this also changes the air bearing values. All specifications must be considered when using compressed air.
- How clean must the supply air be?
- Cleanliness class between 3 and 4 of ISO 8573.1
- How are air bearings maintained?
- The air bearings are maintenance-free.
- Can I clean the surface?
- Use a soft cloth with isopropyl alcohol and let it dry.
- How do I install an air bearing?
- Please read the instructions before starting. Each type of air bearing must be installed differently and this should be taken into account during the design phase.
- How does an air bearing maintain stability and damping effect?
- Air bearings are coated with a special epoxy resin that seals the pores on the surface where no airflow is desired. The design thus forces the airflow in the direction of the friction-free surface. This results in greater rigidity, more stability and better damping properties.