RB40040 Crossed Roller Bearing
The RB40040 crossed roller bearing is a high-precision, compact bearing designed for applications requiring exceptional rigidity and rotational accuracy within limited installation space. Its structure features cylindrical rollers arranged alternately at right angles between the inner and outer rings, allowing the bearing to support loads in all directions - radial, axial, and moment loads - simultaneously.
The RB series adopts an integrated outer ring and a separable inner ring, making it ideal for installations where high precision of the outer ring rotation is essential. The RB40040 model offers excellent stiffness, smooth running performance, and simplified mounting, making it a reliable choice for precision rotary tables, robotic joints, and advanced machine tools.
Optimized Load Balance
Each roller alternates in perpendicular orientation, enabling uniform load distribution across all directions.
Superior Rigidity
Compact cross-section provides excellent stiffness without increasing system size.
High Running Accuracy
Precision machining ensures smooth rotation and minimal friction torque.
Stable Under Moment Loads
Designed to sustain combined loads including overturning moments.
Technical Specifications
| Model | RB40040 |
| Inner Diameter (d) | 400mm |
| Outer Diameter (D) | 510mm |
| Roller Pitch Diameter (Dpw) | 453.4mm |
| Width (B) | 40mm |
| Chamfer (rmin) | 2.5 |
| Shoulder Size (ds) | 428 |
| Shoulder Size (Dh) | 479 |
| Basic Load Rating (Radial) (Cr) | 241kN |
| Basic Load Rating (Radial) (Cor) | 531kN |
| Precision Class | P5 / P4 / P2 |
| Weight | 23.5kg |
| Structure | Split outer ring, integral inner ring |
| Lubrication | Grease or oil lubrication |
Customization and Special Options
The RB40040 crossed roller bearing can be customized to meet various performance and environmental requirements.
Available options include:
- Cage Materials: Choice of brass, resin, or steel cages to match different operating conditions.
- Surface Treatments: Optional black oxide or anti-corrosion coatings for enhanced durability and extended bearing life.
- Clearance and Preload: Adjustable clearance and preload configurations available to achieve the desired rigidity and rotational precision.
- Lubrication Options: Specialized grease or oil lubrication can be applied for low-noise, high-speed, or high-temperature applications.
These customization options ensure the RB40040 bearing performs optimally across a wide range of precision motion and automation systems.
RB40040 Crossed Roller Bearing - FAQ
How does the RB40040 differ from other RB series bearings?
Compared with smaller RB models, the RB40040 offers a larger bore size and enhanced load capacity. It provides better stiffness and moment resistance, making it ideal for heavy-duty precision machinery.
What should be considered when installing the RB40040 bearing?
Ensure even tightening of bolts on the split outer ring, correct positioning of rollers, and appropriate preload settings to maintain accuracy and reduce friction.
Does the RB40040 require preload adjustment?
Preload can be adjusted during installation depending on the system's stiffness and precision requirements. Proper preload improves rigidity and minimizes vibration.
What makes the RB40040 ideal for precision applications?
Its high-accuracy raceways, cross-roller arrangement, and stable rotational performance minimize deformation and positioning errors, ensuring consistent accuracy in critical motion systems.
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