What is the RU-Type Crossed Roller Bearing?

 What is the RU-Type Crossed Roller Bearing?  

  The RU-type crossed roller bearing (also called RU cross roller bearing) is a split inner ring design that allows for easy installation and high precision in applications requiring compactness, rigidity, and multi-directional load capacity. Unlike the RA-type (which has a one-piece inner ring), the RU-type features a two-part inner ring with mounting holes, making it ideal for applications where space constraints or complex assembly processes are a concern.  

  NewBee Transmission’s RU cross roller bearings are engineered for high rotational accuracy (P4/P2 grade) and can handle radial, axial, and moment loads simultaneously, making them essential for robotics, automation, and precision machinery.  

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 Features of the RU-Type Crossed Roller Bearing  

 1. Split Inner Ring Design  

- The two-piece inner ring simplifies installation and maintenance, especially in confined spaces.  

- Mounting holes on the inner ring allow for direct bolting to machinery, reducing alignment errors.  

 2. High Load Capacity & Rigidity  

- 90° crossed roller arrangement distributes loads evenly, supporting radial, axial, and tilting moments in a single bearing.  

- High rigidity due to large contact area between rollers and raceways, minimizing deformation under heavy loads.  

 3. Ultra-Precise Rotation (P4/P2 Grade)  

- Radial runout ≤ 0.002mm, ensuring smooth and accurate motion for high-precision applications.  

- Ideal for CNC rotary tables, robotic arms, and optical equipment where minimal vibration is critical.  

 4. Space-Saving & Lightweight  

- Thin-section design reduces machine footprint while maintaining high load capacity.  

- Available in inner diameters from 50mm to 200mm, with customizable sizes upon request.  

 5. Long Service Life  

- Made from high-carbon chromium steel (GCr15) or stainless steel (440C) for durability.  

- Optional ceramic rollers for extended life in high-speed or corrosive environments.  

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 Applications of RU-Type Crossed Roller Bearings  

  Due to their high precision, compact design, and ease of installation, RU cross roller bearings are widely used in:  

- Industrial Robots: Rotary joints, robotic arm linkages, and harmonic drive supports.  

- Machine Tools: CNC rotary tables, indexing heads, and multi-axis machining centers.  

- Medical Equipment: CT/MRI scanner gantries, surgical robot rotation mechanisms.  

- Semiconductor Manufacturing: Wafer handling robots, precision alignment stages.  

- Optical & Measuring Instruments: Telescope mounts, laser cutting rotary platforms.  

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 Factors Affecting RU-Type Bearing Price  

1. Material  

   - Standard GCr15 steel: Cost-effective for general industrial use.  

   - 440C stainless steel: 20-30% more expensive, ideal for corrosive or medical environments.  

   - Ceramic rollers: Higher cost but offer superior performance in extreme conditions.  

2. Precision Grade  

   - P4 (standard): Suitable for most industrial applications.  

   - P2 (ultra-precision): 15-25% more expensive, used in semiconductor/medical fields.  

3. Size & Customization  

   - Larger bearings (>150mm inner diameter) cost more due to material and machining complexity.  

   - Special lubricants, seals, or preload adjustments increase price by 10-20%.  

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 How to Choose the Right RU Cross Roller Bearing?  

1. Check Dimensions – Match inner diameter (d), outer diameter (D), and width (B) to your application.  

2. Determine Load Requirements – Ensure the bearing can handle combined radial, axial, and moment loads.  

3. Precision Needs – Select P4 for general use or P2 for ultra-high precision.  

4. Environmental Conditions – Choose stainless steel (440C) for humid/cleanroom environments.  

5. Supplier Reliability – Opt for certified manufacturers like NewBee Transmission for quality assurance.  

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 Why Choose NewBee Transmission for RU Cross Roller Bearings?  

✅ Factory-direct pricing with no middleman markup.  

✅ Custom solutions available (special sizes, materials, lubrication).  

✅ ISO 9001-certified production with strict quality control.  

✅ Technical support for bearing selection and integration.  

For quotes, specifications, or customization, contact:  

frank@newbeetrans.com  

www.newbeetrans.com  

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 Installation & Maintenance Tips  

✔ Use mounting holes for secure installation—avoid hammering.  

✔ Apply proper lubrication (grease filling: 1/3–1/2 of internal space).  

✔ Monitor temperature & vibration (normal operating temp ≤ 70°C).  

The RU-type crossed roller bearing is an excellent choice for engineers who need high precision, easy installation, and multi-directional load support in a compact design.