Inside every joint of a collaborative robot, bearings must simultaneously meet the triple requirements of high precision, high rigidity and lightweight within compact space. Unlike industrial robots that pursue extreme speed and payload, the core competitiveness of collaborative robots lies in safety, compliance and natural human-robot interaction. They must maintain precise position control and force feedback while working alongside humans, while also achieving low weight, low power consumption and low noise. Collaborative robot joint bearings are the physical foundation supporting these capabilities.

 

The operating conditions of collaborative robot bearings have distinct characteristics. Extremely compact joint space——collaborative robot joint diameters are typically half or even smaller than industrial robots, requiring bearings to provide sufficient rigidity and load capacity within extremely limited radial and axial space； frequent human-robot interaction——collaborative robots must quickly stop or reverse motion upon encountering external forces, with bearings enduring frequent impact and alternating loads； high-precision force control and position control——collaborative robots rely on精密 torque sensors and encoders for compliant control, with bearing friction fluctuation directly affecting force control precision and the smooth feel of drag teaching； low noise and low vibration——collaborative robots are often deployed in offices, laboratories, hospitals and other people-dense environments, with equipment noise directly affecting user experience and environmental quality.

 

When collaborative robot joint bearings develop increased clearance or friction fluctuation, drag teaching resistance becomes uneven and operator feel deteriorates； when bearing rigidity is insufficient, robots experience微小 deformation under loads and positioning precision decreases； when bearing weight is excessive, robot self-weight increases, effective payload decreases, energy consumption rises and safety declines.

 

Japan NMT collaborative robot joint bearings are specialized product series developed specifically for the stringent requirements of collaborative robots for high precision, high rigidity, lightweight and low friction. NMT collaborative robot joint bearings feature systematic specialized optimization in thin section design, ultra-high-precision manufacturing, lightweight materials and low-friction control——ensuring stable and reliable joint support and transmission performance through long-term human-robot collaboration of various collaborative robots.

 

NMT collaborative robot joint bearings precisely address the core positions of various collaborative robots. Collaborative robot base and shoulder joint bearings utilize high-rigidity thin section crossed roller bearings, withstanding robot self-weight and end loads while maintaining smooth and precise high-torque transmission, with thin section design significantly saving joint axial space and leaving more installation space for harmonic reducers and drive motors. Crossed roller bearings, with their orthogonally arranged cylindrical rollers, achieve line-contact load distribution with rigidity several times that of ball bearings of equivalent size, maintaining micron-level rotational precision even under frequent human-robot interaction impacts. Collaborative robot elbow and wrist joint bearings utilize ultra-high-precision thin section angular contact ball bearings or hybrid ceramic bearings, providing zero-backlash, low-friction rotational support within limited space. The low density and low centrifugal force of ceramic balls make joint response more sensitive, while electrical insulation blocks shaft current damage to bearings. Collaborative robot end-effector flange and force sensor bearings utilize ultra-low-friction precision bearings, maintaining extremely low friction interference under force feedback and drag teaching, ensuring force control precision and smooth feel. Collaborative robot joint module integrated bearings utilize integrated thin section bearing solutions, deeply integrating bearings with harmonic reducers or torque motors to further compress joint axial dimensions, enabling more compact joint designs for collaborative robots.

 

NMT collaborative robot joint bearings utilize high-purity bearing steel or silicon nitride ceramic ball materials, processed through vacuum degassing and ultra-purification refining to provide excellent fatigue resistance and dimensional stability under frequent start-stop and impact. Raceways undergo nanometer-level superfinishing, and rolling elements undergo ultra-high-precision grading screening to achieve extremely low friction coefficient, effectively reducing joint power consumption and temperature rise. Bearing clearance is precisely set with compensation optimization for frequent start-stop and temperature variations, maintaining proper internal gaps under various operating conditions.

 

Thin section design is one of the core technical advantages of NMT collaborative robot joint bearings. Regardless of bore size changes, bearing cross-section dimensions remain consistent, allowing collaborative robot designers to use the same mounting interface and lubrication solutions across joints of different diameters, dramatically simplifying structural layout and assembly processes while creating valuable space for more compact reducers and drive components.

 

Lightweight is another core requirement for collaborative robot bearings. NMT collaborative robot joint bearings employ thin-wall structure design and ceramic ball materials to minimize weight while ensuring rigidity and life. Ceramic ball density is only 41% of steel, reducing weight by approximately 60%, significantly lowering joint rotational inertia, making drag teaching lighter and more sensitive, while reducing motor power consumption and extending robot runtime.

 

Low friction is key to force control and drag teaching precision. NMT collaborative robot joint bearings achieve extremely low starting and running friction torque through nanometer-level superfinished raceways, ultra-high-precision rolling element grading and low-friction seal design, ensuring operators experience uniform, smooth resistance during drag teaching without stick-slip or hesitation.

 

Reasons for selecting NMT collaborative robot joint bearings：

 

Thin section crossed roller bearing solutions with rigidity several times ball bearings, significantly saving joint space

 

Ultra-high-precision thin section angular contact ball or hybrid ceramic bearings for elbow and wrist joint compact space

 

Thin-wall structure + ceramic ball lightweight design reducing bearing weight by approximately 60%, lowering joint inertia and power consumption

 

Nanometer-level superfinished raceways for extremely low friction and minimal starting torque, smooth and sensitive drag teaching

 

Ultra-high-precision graded rolling elements with micron-level consistency for long-term stable rotational precision

 

Ceramic ball electrical insulation blocking shaft current damage, suitable for collaborative robot joint modules

 

Precisely set bearing clearance matched to frequent start-stop and temperature variations

 

Ultra-low noise and vibration design for offices, laboratories, hospitals and other people-dense environments

 

Passed rigorous human-robot interaction durability and precision testing for all collaborative robot applications

 

These performance advantages establish NMT collaborative robot joint bearings as the reliable precision components for collaborative robot base, shoulder, elbow, wrist and end-effector joints.

 

Application scenarios

 

Collaborative robot base and shoulder joint bearings

 

Collaborative robot elbow and wrist joint bearings

 

Collaborative robot end-effector flange and force sensor bearings

 

Collaborative robot joint module integrated thin section bearings

 

Medical assistance and rehabilitation robot joint bearings

 

Service robot mobility and manipulation joint bearings

 

Laboratory automation collaborative robot joint bearings

 

Flexible assembly and human-robot collaboration workstation joint bearings

 

Precision manufacturing

 

Produced according to collaborative robot industry standards and precision bearing manufacturing specifications, NMT collaborative robot joint bearings utilize high-purity bearing steel or silicon nitride ceramic materials, processed through vacuum degassing refining, nanometer-level superfinishing, ultra-high-precision rolling element grading screening, thin section precision forming, precision assembly and clearance setting, precision dynamic balancing inspection, rotational accuracy verification, starting torque testing and human-robot interaction durability validation——ensuring every product delivers high precision, high rigidity, lightweight and low friction.

 

Product range

 

Collaborative robot base thin section crossed roller bearings

 

Collaborative robot shoulder thin section bearings

 

Collaborative robot elbow ultra-high-precision angular contact ball bearings

 

Collaborative robot wrist hybrid ceramic thin section bearings

 

Collaborative robot end ultra-low-friction precision bearings

 

Collaborative robot joint module integrated thin section bearings

 

Medical collaborative robot specialized bearings

 

Custom non-standard collaborative robot joint bearings

 

Global industrial service

 

Japan NMT supplies high-quality collaborative robot joint bearings to global collaborative robot manufacturers, medical robot companies, service robot firms and flexible automation system integrators, empowering human-robot coexistence and flexible smart manufacturing in the global robotics industry with high-precision high-rigidity lightweight precision engineering and long-term stable collaborative transmission performance.