I. Three Dimensions of Bearing Innovation: Materials, Structure, and Principles

Bearing technology has been around for over a century, yet innovation has never ceased. From 2025 to 2026, China's bearing industry is undergoing a drastic structural transformation: the total industry revenue reached 246.8 billion yuan, and the production volume exceeded 2.56 billion sets, both setting new historical highs. However, the growth in scale has not simultaneously solved the technical bottlenecks in the high-end sector - the global high-end bearing market is still dominated by the eight major giants from Sweden, Germany, and Japan, taking up more than 70% of the market share. Domestic substitution has entered a deep-water zone, and the real focus of competition has shifted from "can we make" to "can we innovate".

 

The direction of bearing innovation can be summarized into three dimensions: material innovation - rewriting the "genes" of bearings from the source; structural innovation - breaking through physical limits with more ingenious designs; principle innovation - completely overturning the working mode of bearings.

 

The technical system of NMT high-temperature and low-temperature alternating special transmission bearings is the culmination of these three-dimensional innovations.

 

II. Material Innovation: From Rare Earth Bearings to Self-Lubricating Composite Materials

The performance of bearings, over 70% of which depends on materials. In recent years, China has made a series of landmark breakthroughs in bearing materials.

 

Rare earth modified bearing steel is a representative achievement of material innovation. The team led by Academician Li Dianzhong precisely quenched the rare earth, effectively refining the impurity particles in the steel and optimizing the microstructure. From the source, this significantly enhanced the wear resistance, impact resistance, and fatigue resistance of the bearings. The heavy truck hub bearing unit of Linyi Kaiyuan Bearing, jointly developed by this team, achieved an equivalent real vehicle 2 million kilometers of ultra-long service life after testing, far exceeding the basic rated life theoretical value of 109 hours. This breakthrough broke the dependence of high-end long-life commercial vehicle bearings on imported materials.

 

Resin-based self-lubricating composite materials represent another technical route. The team from Dalian University of Technology replaced traditional copper alloys with high-performance resin-based composite materials, successfully preparing short-cut carbon fiber reinforced anthracene-biphenyl polyarylene ether self-lubricating functional composite materials. The new material has a glass transition temperature above 280°C, a bending strength exceeding 200 MPa, a friction coefficient lower than 0.1, and a wear resistance improvement of 74% compared to traditional materials. Using this material, bearing components weigh only 1/6 of copper alloy products, and no additional lubrication coating is required. Under a rotational speed of 12,000 revolutions per minute, they can operate continuously for 6,000 hours, exceeding international first-class standards. This material will be widely used in aviation engine fuel pump thrust bearings, large ship thrust bearing blade surfaces, and other fields.

 

High-purity bearing steel is another cornerstone of material innovation. The Institute of Metal Research of the Chinese Academy of Sciences led the development of the "breaker" main bearing of the 8-meter diameter super-large shield tunneling machine, overcoming key technologies such as high-speed and high-precision machine tool bearings and high-temperature and high-reliability aircraft engine main bearings. The team innovatively developed key technologies such as trace rare earth addition, low-oxygen purification smelting, and control of inclusions refinement and dispersion. Third-party testing showed that the fatigue life of the new bearing steel exceeded that of a certain well-known brand bearing steel imported from abroad, reaching international advanced levels. This breakthrough has connected the entire chain of high-end bearings from "design - materials - manufacturing - application".

 

NMT high-temperature and low-temperature alternating special transmission bearings also rely on material innovation to build core competitiveness. Special heat-stable treated steel controls the residual austenite content in the material structure at an extremely low level, so that the inner and outer diameters of the bearing do not change significantly even under repeated cold and hot cycles. Vacuum degassing high-carbon chromium bearing steel combined with precise heat treatment reduces the non-metallic inclusions content to an extremely low level, increasing the fatigue limit by 38% compared to ordinary products, and the rated life by more than twice the industry standard.

 

III. Structural Innovation: From Thin-Walled Design to Intelligent Pre-Tightening Structural innovation is another key path for bearings to break through performance bottlenecks. Driven by high-end applications such as humanoid robots and semiconductor equipment, the design of bearing structures is evolving towards thinner, lighter, and more precise directions.

 

The thin-wall cross-roller bearing is a typical representative of structural innovation. The joints of humanoid robots have extremely high requirements for the thinness and lightness of the bearings - a 40% weight reduction, a 50% reduction in friction torque, and an extension of service life to over 15,000 hours. The thin-wall cross-roller bearings developed by Luoyang Hongyuan Bearing adopt a 5-millimeter ultra-thin cross-section design and have been used by Honor Robotics to break through the limits of human half-marathon. The single machine of humanoid robots can carry up to 134 bearings. By 2030, the global market size for robot bearings and universal joints is expected to reach 2.1 billion US dollars and 4.7 billion US dollars respectively. Schaeffler has launched the XZU double-row angular contact needle roller bearing specifically designed for robots, with an inclined stiffness that is over 30% higher than traditional models.

 

Intelligent preload compensation is another important structural innovation for machine tool spindle bearings. The spindle of woodworking tool compound processing equipment reduces 72.0% of axial thermal deformation through measures such as replacing ceramic hybrid bearings and adopting intelligent preload compensation, and the temperature fluctuation is controlled within ±3.5℃. The temperature rise of 1℃ in the previous bearing causes a radial displacement of the spindle end of about 1.2 μm - this micrometer-level thermal deformation control is the core competitiveness of precision processing.

 

The elastic + anti-slip composite structure represents the direction of structural innovation for automotive bearings. The new patent of bearing components announced by FAW has added a detachable ring-shaped elastic component outside the bearing outer ring and integrated multiple anti-slip units evenly distributed along the circumference on the outside of the elastic component. Compared with traditional interference fits and simple press-fitting methods, this elastic + anti-slip composite structure effectively solves the pain points of traditional bearings.

 

NMT is also at the forefront of structural innovation in the industry. Thermal balance simulation optimization of the structure precisely controls the matching relationship of the thermal expansion coefficients of each component, ensuring that the internal clearance of the bearing remains within a reasonable range after reaching the thermal stable state. The thermal expansion coefficient of the high-temperature alloy cage precisely matches that of the bearing steel, maintaining a reasonable guiding gap within a wide temperature range from room temperature to 300℃. The ceramic hybrid bearing solution reduces the friction coefficient by 30% and the heat generation by 25%, and is particularly suitable for high-speed and precision scenarios.

 

IV. Principle Innovation: From Mechanical Contact to Non-contact Suspension

If material innovation and structural innovation are "improvements", then principle innovation is a "revolution". Air bearings and magnetic suspension bearings have completely overturned the traditional bearing's reliance on mechanical contact for operation.

 

The fully dynamic pressure air bearing is a milestone in principle innovation. Shanghai Pu Jian Aviation spent 25 years independently developing and successfully achieving commercial production of the fully dynamic pressure air bearing technology. This technology abandons the traditional bearing's reliance on steel balls rolling and grease lubrication, and utilizes the aerodynamic effect generated by the high-speed rotation of the rotor to form a micrometer-scale gas film to support the rotor "suspended" operation. This "zero-contact, no-wear" characteristic has achieved a reduction in dimensions compared to traditional bearings in terms of speed, accuracy, and lifespan.

 

The application scenarios of fully dynamic pressure air bearings are extremely broad: AI supercomputing server cooling modules utilize the ultra-high speed and low-noise characteristics to provide revolutionary temperature control solutions for the next-generation data centers; ultra-high-speed micro blowers, for scenarios such as semiconductor cleaning and new energy fuel cells, fill the domestic gap with extremely high rotational speed stability and pollution-free advantages. The project plans an area of 37 mu and has a total investment of 1 billion US dollars, with an estimated annual output value exceeding 2 billion US dollars after production.

 

Hydrogen gas lubrication bearings are the principle innovation direction in the hydrogen energy field. For hydrogen fuel cell air compressors, researchers have proposed new structures such as spiral groove gas bearings and chevron groove gas bearings. Northwestern Polytechnical University has explored the hydrogen damage issues faced by bearings in aerospace hydrogen engines, and pointed out that uniform hydrogen distribution, uniform stress, and uniform damage are important strategies for improving the hydrogen environment adaptability of bearings.

 

Air static pressure bearings also have great potential in the semiconductor field. The semiconductor equipment research group of Northwestern Polytechnical University has proposed a new type of composite throttling high-stiffness large-capacity force-floating spindle, and developed 8-inch air-floating turntables and air-floating spindle series products. The Mug GAT linear air bearing, with its zero-contact and frictionless characteristics, has a straightness error of less than 0.1 μm/100mm, and is redefining the standard for ultra-precision motion control.

 

Although NMT mainly focuses on traditional rolling bearings as its core products, it also pays attention to and lays out innovative principles. The wide temperature range solid lubrication solution can replace traditional grease lubrication in extreme temperatures and meet the requirements of special scenarios such as vacuum and ultra-low temperatures. The ceramic hybrid bearing technology provides a transitional path for evolving from mechanical contact to oil-free and long-life directions.

 

VII. Manufacturing Innovation: From Digitalization to Green Circulation

Innovation not only occurs at the product end, but also at the manufacturing end. The manufacturing innovation in the bearing industry is unfolding along the two main lines of digitalization and greenization.

 

Digitalization and intelligence are reshaping the research and production methods of bearings. By 2025, the intelligent transformation of the bearing industry will enter the stage of large-scale application. From machine learning-based bearing quality identification methods to intelligent pre-tightening force compensation and predictive maintenance, digital technology is penetrating the entire life cycle of bearings. Experts suggest forming a virtuous cycle of iterative upgrading through the joint establishment of standard databases, integrated design and selection software, etc.

 

Green manufacturing and circular economy is another innovation mainline. SKF's Infinium technology indicates that regenerative repair of bearings can reduce CO₂ emissions by approximately 75-85%. SKF's RecondOil oil recycling system promotes the realization of a green closed loop in the lubrication process. The penetration rate of green low-carbon technology in the bearing industry has reached 28%. During the "14th Five-Year Plan" period, the industry will transform towards high-end, intelligent, and green directions, and achieve a main business revenue of over 3000-3175 billion yuan by 2030.

 

NMT's practice in manufacturing innovation is also solid. From material selection to structural optimization, from lubrication customization to sealing solutions, NMT provides precise-matched products and services for each equipment. Main specifications are in stock in regular quantities, installation dimensions follow industry standards, and they can directly replace imported similar products, effectively reducing customers' procurement costs and delivery cycles.

 

VIII. Application Innovation: From Traditional Domains to Strategic Emerging Sectors

The ultimate value of bearing innovation lies in the application end. From humanoid robots to low-altitude economy, from semiconductors to hydrogen energy, from healthcare to wind power - strategic emerging sectors are redefining the technical boundaries of bearings.

 

Humanoid robots are currently the most explosive growth point. In 2025, the shipment of humanoid robots in China was 14,400 units, accounting for 84.7% of the global market. Bearings are highly installed in the joints of robots and the hands of dexterity, with a single machine installation quantity of up to 134 bearings. Domestic manufacturers are fully leveraging their strong customization design capabilities and fast response speed to accelerate their penetration into the leading supply chain.

 

Low-altitude economy is another rapidly growing emerging sector. Luoyang Bearing Group's "high-temperature-resistant, corrosion-resistant transmission system bearings" have completed application verification in low-altitude economy equipment and aviation equipment. Wanxiang Qianchao's related bearing products have passed heavy-load unmanned aerial vehicle airworthiness tests and received small-batch orders.

 

Semiconductor equipment has strict requirements for the vacuum compatibility, pollution-free, and ultra-high precision of bearings. High-speed vacuum pump bearings need to withstand a rotational speed of over 6000 r/min for a long time. The P4 grade ultra-thin-walled stainless steel bearings can be widely applied in high-end manufacturing fields such as precision automation and semiconductor equipment.

 

In the medical device field, the medical CT-specific wire raceway ball bearings launched by SKF meet the requirements of high rotational speed and low noise. In the hydrogen energy field, innovative products such as hydrogen gas lubrication bearings and ceramic bearings are addressing the dual challenges of ultra-low temperature and high temperature.

 

The NMT high and low temperature alternating specialized transmission bearings are precisely designed for these strategic emerging sectors. Special heat-stable treated steel ensures the dimensional stability of the bearings in a wide temperature range; thermal balance simulation optimizes the structure to maintain reasonable clearance within the full working temperature range; the wide temperature range specialized lubrication system ensures both low-temperature startability and high-temperature stability; the full spectrum of sealing solutions effectively resist the intrusion of dust, moisture, and corrosive media.

 

VII. Value Summary

The bearing industry is undergoing a profound transformation from "scale leadership" to "quality leadership" and "innovation leadership". Material innovation gives bearings a stronger "body", structural innovation enables bearings to play a more precise role in more extreme spaces, principle innovation completely overturns the working mode of bearings, manufacturing innovation makes the production of bearings more intelligent and green, and application innovation pushes bearings to the forefront of human industry.

 

The NMT high and low temperature alternating specialized transmission bearings are precisely the participants and drivers of this innovation wave. From special heat-stable treated steel to thermal balance simulation optimization of the structure, from the wide temperature range lubrication system to the full spectrum of sealing solutions, NMT integrates material, structure, principle, manufacturing, and application innovations, providing precise-matched products and services for strategic emerging sectors such as robots, low-altitude economy, semiconductors, medical care, hydrogen energy, and wind power. Let each piece of equipment be able to serve production with stable accuracy and long-lasting lifespan in extreme temperatures and complex environments, and let innovation become the most enduring competitiveness of the bearing industry.