INA XU050077 Crossed Roller Bearing
The INA XU050077 is a high-precision, face-mount crossed roller bearing belonging to INA's XU series (Integrated Inner/Outer Ring Type with Mounting Holes, Non-Geared Version). This advanced bearing design features cylindrical rollers arranged perpendicular to each other in 90° V-grooves, separated by a precision spacer retainer, enabling it to simultaneously accommodate radial, axial, and moment loads from all directions while maintaining exceptional rotational accuracy and rigidity.
The INA XU050077 is a high-precision, face-mount crossed roller bearing belonging to INA's XU series (Integrated Inner/Outer Ring Type with Mounting Holes, Non-Geared Version). This advanced bearing design features cylindrical rollers arranged perpendicular to each other in 90° V-grooves, separated by a precision spacer retainer, enabling it to simultaneously accommodate radial, axial, and moment loads from all directions while maintaining exceptional rotational accuracy and rigidity. It is part of Schaeffler Group's premium crossed roller bearing lineup, designed for demanding applications requiring compact dimensions and high performance.
Model Coding Explanation
| Code | Meaning |
|---|---|
| XU | Integrated Inner/Outer Ring Type Crossed Roller Bearing, Non-Geared Version |
| 050077 | Dimension code (Inner diameter 40 mm, Outer diameter 112 mm, Roller Pitch Diameter 77.5 mm) |
Key Specifications
| Parameter | Value |
|---|---|
| Model Number | XU050077 |
| Inner Diameter (dᵢ) | 40 mm |
| Outer Diameter (Dₐ) | 112 mm |
| Width (H) | 22 mm |
| Roller Pitch Circle Diameter (Dᵢ) | 77.5 mm |
| Mounting Holes - Inner Ring | 6 holes, PCD 56 mm, M8 threaded holes |
| Mounting Holes - Outer Ring | 6 holes, PCD 97 mm, φ6.6 through holes |
| Basic Dynamic Load Rating (Cᵣ) | 14.1 kN |
| Basic Static Load Rating (C₀ᵣ) | 20.1 kN |
| Basic Static Axial Load Rating (C₀ₐ) | 41.0 kN |
| Mass | 1.4 kg |
| Precision Class | P5 (Rotational accuracy: Radial runout - 5 μm, Axial runout - 5 μm) |
| Radial Clearance | Preloaded (factory-set for optimal rigidity and performance) |
| Material | High carbon chromium bearing steel (100Cr6, DIN EN 10028) |
| Sealing Options | Open type (as specified in this model); sealed versions available |
| Operating Temperature Range | -30°C to +100°C |
| Rotation Capability | Suitable for both inner-ring rotation and outer-ring rotation applications |
Structural Features
- Integrated Inner/Outer Ring Design: Both rings are one-piece construction, eliminating the need for special flanges or housings, providing exceptional rigidity and stability compared to split-ring designs. This structure ensures minimal deformation under load and maintains consistent rotational accuracy.
- Non-Geared Configuration: Designed for applications where a separate drive mechanism is preferred, offering clean, unobstructed mounting surfaces and versatile integration into various mechanical systems.
- Face-Mount Configuration: Pre-machined mounting holes on both rings allow direct bolting to equipment, simplifying installation and reducing assembly time. The symmetrical design ensures balanced load distribution during mounting.
- Crossed Roller Arrangement: Ensures uniform load distribution across all rollers, maximizing load capacity while minimizing overall bearing size. This design provides 3-4 times higher rigidity than traditional ball bearing arrangements.
- Precision Spacer Retainer: Prevents roller contact and cage locking, improving reliability, reducing friction, and extending service life compared to traditional steel plate retainers. The retainer also ensures proper roller alignment for smooth, precise rotation.
Applications
The INA XU050077 is ideally suited for applications requiring compact dimensions, high rigidity, and precise rotation control:
- Industrial robot joints and rotary components
- Precision rotary tables for machine tools and metrology equipment
- Medical devices (e.g., diagnostic scanners, surgical robots, imaging systems)
- Semiconductor and IC manufacturing equipment
- Measuring instruments and optical devices
- Small precision automation systems and manipulators
- Harmonic drive gearboxes and cycloidal transmission systems
Installation & Maintenance Guidelines
- Mounting: Secure directly to equipment using appropriate M8 bolts for the inner ring and matching bolts for the outer ring without special housing or presser flanges. Ensure mounting surfaces are flat, parallel, and clean to maintain bearing accuracy.
- Preload: Factory-set preload provides optimal performance for most applications; additional preload can be applied if required by specific operating conditions, following INA's technical guidelines.
- Lubrication: Open type requires initial grease lubrication (INA recommended: lithium soap-based grease with appropriate viscosity); sealed versions are factory-lubricated for life under normal operating conditions. Regular relubrication is recommended for heavy-duty applications.
- Operating Limits: Avoid shock loads and excessive speeds beyond rated capacity to ensure maximum service life and maintain precision performance. Follow INA's load and speed calculation guidelines for specific application requirements.
- Accuracy Assurance: Mounting surfaces should have a flatness tolerance of ≤ 2 μm and parallelism tolerance of ≤ 3 μm to maintain the bearing's P5 class rotational accuracy (radial runout ≤ 5 μm, axial runout ≤ 5 μm).
