Development of Specialized Bearings for Industrial Robots（Ⅰ）

Development of Specialized Bearings for Industrial Robots（Ⅰ）

After half a century of development, industrial robots have been widely used in various fields, including automobile manufacturing, due to their advantages such as high repeatability, reliability, and strong resistance to harsh environments. The widespread adoption of industrial robots is an effective way for automobile companies to achieve automated production, improve product quality and efficiency, reduce labor and manufacturing costs, and enhance industry competitiveness.

As a critical component of industrial robots, robotic bearings and precision custom gears play a vital role in performance. These include high precision gears that directly influence key metrics such as operational stability, repeat positioning accuracy, and rotational precision. Selecting the right precision gear and transmission manufacturer ensures improved operational reliability and long-term durability in automated systems.

To meet demanding application needs, modern industrial robots often rely on high precision gear manufacturing and custom engineered gears, designed with meticulous precision gear customization in mind. Partnering with a trusted robotics bearing distributor and a supplier capable of delivering high precision custom gears is essential for maintaining optimal performance across complex industrial applications.

Characteristics and Classification of Specialized Bearings for Industrial Robots  

The development trend of modern industrial robots leans toward lightweight designs, which requires supporting bearings to have a more compact structure. Bearings must meet the performance requirements of load capacity, precision, stiffness, and friction torque within limited installation space. Standard universal bearings often fail to meet these demands, whereas thin-walled bearings, designed for extreme dimensional limits, offer excellent performance in terms of lightweight, compact size, high precision, and long service life, effectively addressing this issue.  

 Specialized bearings for industrial robots mainly include:  

- Equal-section thin-walled bearings

- Thin-walled cross-cylindrical roller bearings

- Bearings for RV reducers  

- Flexible bearings for harmonic reducers

Most of these bearings adopt non-standard, multi-rolling-element design principles, tailored to meet the demands of modern high precision gear systems.

Specialized bearings for industrial robots are not only the core components of the robot joint system's rotation and movement but also serve as load-bearing elements. Their overall performance plays a crucial role in ensuring the safe and efficient operation of the system, especially when paired with precision custom gears or high precision custom gears used in robotics applications.

The flexible characteristics of thin-walled bearings have a significant impact on the robot's dynamic performance, load capacity, and motion accuracy—factors that are essential for high precision gear manufacturing. These features support the smooth functioning of systems developed by leading precision gear and transmission manufacturers and trusted robotics bearing distributors. As robotic systems increasingly rely on custom engineered gears and advanced precision gear customization, the integration of suitable bearing solutions becomes more critical than ever.

Design Principles for Industrial Robot Bearings  

Typically, the structural form and main parameters of universal bearings are determined by optimizing the rated dynamic load as the objective function under certain constraints. However, when applied in high precision gear systems or robotics, thin-walled bearings must not only have a high rated dynamic load to ensure sufficient load capacity, but also strong stiffness and low friction torque to guarantee the positioning accuracy and smooth operation of the robot. These performance criteria are essential in systems using precision gears and custom engineered gears, where accuracy and efficiency are critical.

Therefore, during the bearing design and analysis process, three indicators—rated dynamic load, stiffness, and friction torque—should be considered as objective functions for multi-objective optimization design. This is especially true in high precision gear manufacturing, where small variances can affect precision gear customization. Special attention must be paid to the varying effects of these parameters on bearing performance, particularly in environments demanding high precision custom gears and components from a reliable precision gear and transmission manufacturer.

Flexible bearings, commonly used in robotic joints, are a special type of thin-walled ball bearings. Some aspects of their design can refer to the design methods of thin-walled ball bearings, such as the selection and calculation of main parameters like ball diameter, groove curvature coefficient, groove diameter, material selection, heat treatment, and machining processes. These are critical in applications where precision custom gears and high precision gears work in tandem with advanced bearing systems. However, due to their unique application requirements, other main parameters—such as the number of balls, ball pitch diameter, flange diameter, ball filling angle, cage pocket diameter and shape, and clearance selection—require corresponding adjustments to their calculation formulas, especially in collaboration with a skilled robotics bearing distributor.
 
                                            （For more content, please refer to the subsequent articles）