HRAU Series Crossed Roller Bearings
An ultra-thin crossed roller bearing with integral inner and outer rings, designed for lightweight, compact precision rotary assemblies such as robots and manipulators.
Key Parameters
| Series | HRAU Series |
|---|---|
| Design | Ultra-thin section; integral inner and outer rings |
| Roller Arrangement | Cylindrical rollers arranged alternately at 90° |
| Seal Type | 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 | Ultra-thin, lightweight, compact, with integral rings |
HRAU Series Crossed Roller Bearings Overview
The HRAU series is an ultra-thin, compact crossed roller bearing developed by minimizing the inner- and outer-ring thickness of the RB-type design. Both rings use an integral construction, making the series particularly suitable for lightweight, space-saving assemblies such as robot and manipulator rotary sections. It can be used where either the inner ring or the outer ring rotates.
Design & Performance Features
- Cylindrical rollers are alternately arranged at 90°, forming a compact, highly rigid load-carrying structure within an ultra-thin cross-section.
- A single bearing can accommodate radial loads, bidirectional axial loads and overturning moments.
- Integral inner and outer rings support applications with either inner-ring or outer-ring rotation.
- The ultra-thin, lightweight design helps reduce mechanism size, mass and rotational inertia.
- Suitable for precision mechanisms requiring low weight, compact dimensions and stable rotary performance in limited installation space.
Mounting & Operating Notes
Mounting flanges and support housings should provide sufficient rigidity and uniform circumferential fastening to prevent local deformation of the ultra-thin rings.
Mating surfaces should provide good flatness, concentricity and finish; avoid impact or uneven loading during installation.
Fits, tolerances, lubrication and operating clearance should be selected according to load, accuracy, speed and temperature conditions.
Typical Applications
Industrial robot joints, manipulators and end effectors
Precision rotary tables, indexing units and machine-tool rotary axes
Semiconductor, inspection and automation equipment
Medical, optical and compact high-precision rotary devices
Series & Model Information
The HRAU prefix identifies this ultra-thin crossed roller bearing series with integral inner and outer 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, reference mass and mounting conditions. Refer to the technical table on this page for available models and specifications.
