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Crossed Roller Bearings Series RU

The RU series crossed roller bearings feature rollers arranged at 90° perpendicular angles, enabling them to simultaneously withstand radial loads (Fₐ), axial loads (Fᵣ), and overturning moments (M). Their split inner and outer ring structure allows for clearance adjustment and preload optimization.

Crossed Roller Bearings Series RU
Crossed Roller Bearings Series RU
  Type Main dimensions Rated load Rated speed
      Dynamics Static Speed limit
Mail   d[mm] D[mm] B[mm] C[kN] C0[kN] [r/min]
RU 445(G) RU 445X 350 540 45 222.0 473.0 -
RU 297(G) RU 297X 210 380 40 156.0 281.0 -
RU 228(G) RU 228X 160 295 35 104.0 173.0 -
RU 178(G) RU 178X 115 240 28 80.3 135.0 -
RU 148(G) RU 148X 90 210 25 49.1 76.8 -
RU 124(G) RU 124X 80 165 22 33.1 50.9 -
RU 85 55 120 15 20.3 29.5 -
RU 66 35 95 15 17.5 22.3 -
RU 42 20 70 12 7.35 8.35 -
Dentail
Core Design
  • 90° crossed roller arrangement enabling simultaneous radial (Fₐ), axial (Fᵣ) and moment (M) load capacities
  • Split inner/outer ring construction for adjustable clearance and preload optimization

Performance Specs
  • Rotational Accuracy: Radial runout ≤ 2μm, Axial displacement ≤ 1μm
  • Load Capacity: Dynamic rating Cₐ ≥ 80kN (model dependent)
  • Speed Limit: Up to 5,000rpm (lubrication dependent)
Technical Advantages
  • High Stiffness: Preloaded stiffness increased by over 30%
  • Low Friction: Superfinishing treated raceways with μ ≤ 0.0015
  • Longevity: Vacuum degassed bearing steel ensures L₁₀ life > 10⁶ cycles
Application
The bearings can be used in the following industries
  • Semiconductor: Lithography machine stages (positioning accuracy ±0.1μm)
  • Robotics: 6 - axis joint reducers (repeatability ±0.02mm)
  • Metrology: CMM rotary axes (angular error ≤ 5 arcsec)
  • Aerospace: Satellite attitude control systems (-50℃~+200℃ operation)
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