How Precision RA Crossed Roller Bearings Are Applied in the Joints of Collaborative Robots?

May 15,2026

What are Precision RA Crossed Roller Bearings?

RA crossed roller bearings are specifically designed for precision rotary systems,featuring a 90° orthogonal crossed roller layout that enables simultaneous bearing of radial loads,axial loads,and overturning moment loads.They are suitable for high-precision,high-rigidity,and space-constrained applications.Their integrated inner ring structure enhances system rigidity and simplifies installation,while the optional preload configuration eliminates internal clearances,making them ideal for equipment requiring stable and precise rotation,such as industrial robots,precision machine tools,optical instruments,and semiconductor manufacturing equipment.

What are Joints of Collaborative Robots?

Collaborative robot (cobot) joints are the core motion units that enable safe,flexible human-robot interaction.Unlike traditional industrial robots,cobots work alongside humans,requiring compact size,lightweight design,high precision,and inherent safety.These joints (shoulder,elbow,wrist) integrate motors,reducers,and bearings,supporting multi-axis movement while ensuring smooth,accurate operation.They must handle dynamic loads,minimize vibration,and maintain rigidity during high-speed or frequent movements.Slim,space-saving design is critical for cobots' lightweight,agile structure.

The Importance of RA Crossed Roller Bearings in Joints of Collaborative Robots

RA crossed roller bearings are the core rotary support for cobot joints,directly determining their precision,rigidity,and safety.

Ultra-compact & Lightweight for Slim Joints:Ultra-thin section (8mm-13mm) and lightweight design fit cobots’ slim joint requirements,reducing overall weight and improving agility without sacrificing rigidity.

High Rigidity for Stable Motion:Crossed-roller layout maximizes contact area,resisting deformation under dynamic loads.Critical for maintaining stability during human-robot interaction.

Precision Positioning for Accurate Tasks:P4/P2 precision and ≤0.002mm runout tolerance ensure micron-level positioning,enabling precise assembly,handling,and other delicate tasks.

Composite Load Capacity for Complex Forces:Bears radial,axial,and moment loads simultaneously,replacing multiple bearings and simplifying joint structure.Reduces assembly errors.

Low Friction & Smooth,Safe Operation:Optimized roller geometry minimizes friction and vibration,ensuring smooth,quiet movement.Critical for safe human-robot collaboration.

Long Life for Frequent Use:Surface-hardened materials (HRC 60-62) enhance fatigue resistance,supporting 24/7 operation.

Manufacturer of RA Crossed Roller Bearings

Newbeetrans is a professional manufacturer of RA crossed roller bearings,delivering tailored solutions for collaborative robots.

Cobot-Focused Customization:Designs for compactness,high rigidity,and low backlash.Supports special lubrication and non-standard sizes.Samples in 10-15 days.

Precision Manufacturing:P4/P2-grade precision via super-fine grinding.Strict quality control for critical dimensions.Monthly capacity >2 million sets.

Fast & Reliable Delivery Standard:RA series shipped within 72 hours.Global logistics support.Quality Assurance ISO 9001 & GB/T 307.1 certified.SGS inspection reports available.

For technical specifications,pricing,or custom bearing solutions:

Email:paul@newbeetrans.com

Website:www.newbeetrans.com