HRU Series Crossed Roller Bearings
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Key Parameters
| Series | HRU Series |
|---|---|
| Design | Integral inner and outer rings |
| Mounting | Mounting holes in both rings for direct installation |
| Seal Type | Open, single-sided or double-sided sealed |
| Load Capability | Radial load, bidirectional axial load and overturning moment |
| Rotating Ring | Suitable for inner-ring or outer-ring rotation |
| Main Benefits | Direct mounting, compact design, high rigidity, stable accuracy and torque |
HRU Series Crossed Roller Bearings Overview
The HRU series has integral inner and outer rings with mounting holes in both rings, allowing direct installation into the machine structure without separate fixing flanges or support housings in typical applications. The integral-ring design minimizes the influence of mounting on bearing performance and supports stable rotational accuracy and torque characteristics with either inner-ring or outer-ring rotation.
Structure Illustration
Design & Performance Features
- Cylindrical rollers are alternately arranged at 90°, forming a highly rigid load-carrying structure within a compact cross-section.
- A single bearing can accommodate radial loads, bidirectional axial loads and overturning moments.
- Both inner and outer rings are integral and include mounting holes for direct connection to machine components.
- Integral rings reduce the influence of mounting on accuracy and preload, helping maintain stable rotational accuracy and torque.
- Suitable for either inner-ring or outer-ring rotation and for compact precision mechanisms requiring high rigidity and stable accuracy.
Mounting & Operating Notes
Fasten uniformly through the inner- and outer-ring mounting holes and tighten gradually in a cross pattern to the specified torque to prevent local ring deformation.
Mounting surfaces should provide sufficient rigidity, flatness, concentricity and finish to maintain bearing accuracy and preload.
Bolt specification, tightening torque, preload, lubrication and operating clearance should be selected according to load, accuracy, speed and temperature conditions.
Typical Applications
Industrial robot joints, rotary units and end effectors
Precision rotary tables, indexing units and machine-tool rotary axes
Semiconductor, measurement and automation equipment
Medical, optical and high-precision inspection instruments
Series & Model Information
The HRU prefix identifies crossed roller bearings with integral inner and outer rings and mounting holes in both rings. Select the exact model according to bore diameter d, outside diameter D, width B, roller pitch circle diameter dp, basic load ratings, seal arrangement, mounting-hole configuration, reference mass and installation conditions. The table below shows HRU124X as a representative model only.
