With the Cross-Roller Bearing, cylindrical rollers are arranged crosswise, with each roller perpendicular to the adjacent roller, in a 90 ゜ V groove, separated from each other by a spacer retainer. This design allows just one bearing to receive loads in all directions including, radial, axial and moment loads.
| Part Number | RA11008/CRBS 1108 Bearing |
| Bearing Type | Crossed Roller Bearings |
| For Load Direction | Combined Radial; Thrust; and Moment |
| Construction | Single Row |
| Seal Type | Open |
| ABEC Rating | ABEC-5, ABEC-7, ABEC-9 |
| Ring Material | Steel |
| Roller Material | Steel |
| Shaft dia. mm | 110 |
| Mass(kg) | 0.15 |
| Bore Dia (d) | 110 |
| Outer Dia (D) | 126 |
| Width (B) | 8 |
| Greasing hole(a) | 2 |
| Greasing hole(b) | 0.8 |
| r(min) | 0.5 |
Since the Cross-Roller Ring achieves high rigidity despite the minimum possible dimensions of the inner and outer rings, it is optimal for applications such as joints and swiveling units of industrial robots, swiveling tables of machining centers, rotary units of manipulators, precision rotary tables, medical equipment, measuring instruments and IC manufacturing machines.
● High Rotation Accuracy of RA 11008 Cross Roller Bearing/ CRBS 1108 Bearings
The spacer retainer fitting among cross-arrayed rollers prevents rollers from skewing and the rotation torque from increasing due to friction between rollers. Unlike conventional types using steel sheet retainers, the Cross- Roller Ring does not cause displacement or locking of rollers and provides a stable rotation torque.
Since the inner and outer rings are designed to be separable, the bearing clearance can be adjusted. In addition, highly accurate rotary motion is ensured through adjusting the bearing clearance to provide a preload.
● Easy Handling
The inner and outer rings, which are separable, are secured to the Cross-Roller Ring body after the rollers and spacer retainers are installed. This procedure prevents the rings from separating from each other. Thus, it is easy to handle the rings when installing the Cross-Roller Ring.
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| Major dimensions | Shoulder dimensions | Basic load rating | Mass |
| Shaft diameter |
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| TKW | Model No. | Inner diameter | Outer diameter | Roller pitch circle diameter |
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| d | D | dp | Width | Greasing hole |
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| C | C0 |
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| B B1 | a | b | rmin | ds | Dh | kN | kN | kg |
| 50 | RA 5008 | 50 | 66 | 57 | 8 | 2 | 0.8 | 0.5 | 53.5 | 60.5 | 5.1 | 7.19 | 0.08 |
| 60 | RA 6008 | 60 | 76 | 67 | 8 | 2 | 0.8 | 0.5 | 63.5 | 70.5 | 5.68 | 8.68 | 0.09 |
| 70 | RA 7008 | 70 | 86 | 77 | 8 | 2 | 0.8 | 0.5 | 73.5 | 80.5 | 5.98 | 9.8 | 0.1 |
| 80 | RA 8008 | 80 | 96 | 87 | 8 | 2 | 0.8 | 0.5 | 83.5 | 90.5 | 6.37 | 11.3 | 0.11 |
| 90 | RA 9008 | 90 | 106 | 97 | 8 | 2 | 0.8 | 0.5 | 93.5 | 100.5 | 6.76 | 12.4 | 0.12 |
| 100 | RA 10008 | 100 | 116 | 107 | 8 | 2 | 0.8 | 0.5 | 103.5 | 110.5 | 7.15 | 13.9 | 0.14 |
| 110 | RA 11008 | 110 | 126 | 117 | 8 | 2 | 0.8 | 0.5 | 113.5 | 120.5 | 7.45 | 15 | 0.15 |
| 120 | RA 12008 | 120 | 136 | 127 | 8 | 2 | 0.8 | 0.5 | 123.5 | 130.5 | 7.84 | 16.5 | 0.17 |
| 130 | RA 13008 | 130 | 146 | 137 | 8 | 2 | 0.8 | 0.5 | 133.5 | 140.5 | 7.94 | 17.6 | 0.18 |
| 140 | RA 14008 | 140 | 156 | 147 | 8 | 2 | 0.8 | 0.5 | 143.5 | 150.5 | 8.33 | 19.1 | 0.19 |
| 150 | RA 15008 | 150 | 166 | 157 | 8 | 2 | 0.8 | 0.5 | 153.5 | 160.5 | 8.82 | 20.6 | 0.2 |
| 160 | RA 16013 | 160 | 186 | 172 | 13 | 2.5 | 1.6 | 0.8 | 165 | 179 | 23.3 | 44.9 | 0.59 |
| 170 | RA 17013 | 170 | 196 | 182 | 13 | 2.5 | 1.6 | 0.8 | 175 | 189 | 23.5 | 46.5 | 0.64 |
| 180 | RA 18013 | 180 | 206 | 192 | 13 | 2.5 | 1.6 | 0.8 | 185 | 199 | 24.5 | 49.8 | 0.68 |
| 190 | RA 19013 | 190 | 216 | 202 | 13 | 2.5 | 1.6 | 0.8 | 195 | 209 | 24.9 | 51.5 | 0.69 |
| 200 | RA 20013 | 200 | 226 | 212 | 13 | 2.5 | 1.6 | 0.8 | 205 | 219 | 25.8 | 54.7 | 0.71 |
Crossed roller bearing is a special type bearing with split inner ring and rotating outer ring. Since the divided inner ring or outer ring is installed with rollers and spacers, it is fixed with the cross roller ring to prevent separation from each other, so it is easy to operate when installing the cross roller ring. Since the rollers are arranged in a cross, only one set of cross roller rings can bear loads in all directions. Compared with the conventional model, the rigidity is increased by 3 to 4 times. At the same time, because the inner ring or outer ring of the cross roller bearing has a two-part structure, the bearing gap can be adjusted, and even if preload is applied, high-precision rotational movement can be obtained. Moreover, due to its special structure, it is usually used as a joint bearing in industrial robots.
When you purchase the crossed roller bearings, please confirm the designation first.
1. Model RU (Integrated Inner/Outer Ring Type)
2. Model RB (Separable Outer Ring Type for Inner Ring Rotation)
3. Model RE (Separable Inner Ring Type for Outer Ring Rotation)
4. USP-Grade Series of Models RB/RE
5. Model RA (Separable Outer Ring Type for Inner Ring Rotation)
6. Model RA-C (Single-Split Type)
Features of Crossed Roller Bearings RA 11008/CRBS 1108
1. Excellent rotation accuracy
2. Simplified operation and installation
3. Withstand large axial and radial loads
4. Significantly save installation space
5. High speed capability
6. Reduce shaft length and processing costs, thermal expansion causes limited changes in geometric dimensions
7. Adopt nylon divider, low moment of inertia, low starting torque, easy to control angle indexing
8. Optimize the pre-tightening force, the rigidity is large, and the guiding roller has high precision
9. Carburized steel provides excellent impact resistance and surface abrasion resistance
10. Simple but well lubricated
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