RU

Customization Options:

• Material: High-quality bearing steel, designated as GCr15 or GCr15SiMn.
• Outer Diameter: From 70mm to 540mm.
• Inner Diameter: From 20mm to 350mm.
• Precision Level: P6, P5, P4, P2.
• Sealing: Unsealed (no suffix), double-sealed (UU, seals on both sides), single-sealed on the side of the outer ring hole (U), and single-sealed on the opposite side of the outer ring hole (UT).
• Clearance: Includes C2, CN, C3, C4.

Features:

• Low Friction Coefficient: RU series crossed cylindrical roller bearings exhibit a low friction coefficient, suitable for high-speed applications approaching the limits of deep groove ball bearings.
• High Radial Load Capacity: These bearings can withstand significant radial loads and are suitable for equipment requiring heavy and impact loads.
• Requires High Precision Shaft or Housing: Due to potential misalignment after installation, RU series bearings require well-machined shafts or housings to prevent stress concentration.
• Adaptability: They can accommodate variations in relative positions between shafts and housings due to thermal expansion or installation errors, making them ideal for applications such as supported free ends.

Installation Considerations:

1. Tolerance Control: After pressing the bearing onto the shaft, it should rotate freely without obstruction. Any noticeable resistance indicates the shaft size is too large, necessitating a reduction in tolerance.
2. Assembly Method: Given their high precision, improper assembly can damage the bearing's raceways. Specialized tools should be used during assembly, avoiding unnecessary force on the bearing.
3. Rotor Imbalance: During dynamic and static balancing of the rotor, precautions should be taken to prevent iron filings from entering the bearing, potentially causing damage.
4. Lubrication Control: While lubrication is essential for smooth operation, excessive grease in the bearing chamber can lead to complications during rotation. Careful control of lubrication quantities is recommended.

Crossed roller bearings in the RU series are available in a comprehensive range of configurations. For machine tools, large-scale robots, and general industrial equipment, the CRBH and CRBHV types, with both inner and outer rings integrated, as well as the CRB and CRBC types with split outer rings along the axial direction, are optimal choices. Small to medium-sized robot joints and semiconductor and electrical equipment benefit from the compact design of the thin-section CRBS, while ultra-thin CRBT models suit precision small-scale devices. Additionally, the high rigidity CRBF and CRBFV types simplify bearing seat structures and include mounting holes.