Since November 2025, following Sanae Takaichi's erroneous remarks, Sino-Japanese relations have once again plunged to a freezing point. This is not merely a diplomatic game, but also raises concerns among Chinese enterprises at the downstream of the high-end precision reducer industry chain about the risks of supply disruption or price hikes.
As the core "joints" of industrial robots, reducers account for about 30%-35% of the total cost of industrial robots. When the supply of reducers is restricted or their prices fluctuate, the chain reaction will be transmitted to the entire industrial robot industry chain, causing a "choke point" dilemma.
Although Japanese reducers have been widely criticized for their long delivery cycles and higher prices, they have consistently dominated China's high-end precision reducer market due to their high precision and durability. Since the 1980s, relying on their profound accumulation in materials science, precision machining processes, and heat treatment technologies, Japanese enterprises have built extremely high technological barriers and spawned a group of Japanese manufacturers represented by Nabtesco and Harmonic Drive Systems.
Currently, there are no public policies from the United States and Japan specifically banning the sale of reducers, but the U.S. generally maintains a cautious attitude toward the export of high-tech products to China. In addition to Japan, European brands such as Schaeffler's Melior Motion PSC series reducers, SPINEA's cycloid reducers, and Wittenstein's Alpha series reducers all occupy a high market share in China's high-end market. According to statistics from MIR Research, the market size of China's reducer market reached 92.3 billion yuan in 2024, but among them, the high-end market share of precision reducers worth about 9.1 billion yuan is still firmly controlled by foreign enterprises.
Market Size and Forecast of China's Precision Reducer Market from 2022 to 2030 (Unit: 100 million yuan) (Note: The data scope only includes the sales scale in the Chinese market, excluding exports)
(Data Source: "2025 China Precision Reducer Industry Development White Paper")
01. The Crisis of High-End Reducers Under the Monopoly of Japanese and European Giants
Changes in geopolitics and trade policies will, to a certain extent, affect the supply chain and development path of China's high-end precision reducers, mainly influenced by the following two risks:
High-cost dependency: Chinese robot OEMs have heavily relied on imported core components from Japan in the past, resulting in high manufacturing costs and being subject to supply cycles and price fluctuations.
Supply chain uncertainty: Tense international relations may lead to an increased risk of technology export controls or trade frictions, directly affecting the security and stability of China's robot and high-end equipment manufacturing industry chains.
Chinese domestic manufacturers mostly follow the existing architectures of leading foreign enterprises (such as Nabtesco and Harmonic Drive Systems) in their technological routes. Although they have integrated certain technological innovations and achieved domestic substitution in the mid-to-low-end market, represented by manufacturers such as Leaderdrive, Huandong Technology, and Zhitong Technology, there is still a significant gap with foreign enterprises in core performance indicators in high-end markets such as automobile manufacturing:
1. Gap in Product Consistency and Durability
Whether it is cycloid (RV) reducers or harmonic reducers, domestic manufacturers still have a gap compared to foreign giants in core performance indicators such as precision retention, rigidity, and flexspline life, causing foreign enterprises to continue to dominate ultra-precision application scenarios such as automotive spot welding.
2. Gap in Precision
In precision planetary reducers, the precision of domestic products is generally above 60 arcseconds, which is difficult to meet the requirements of high-end applications such as machine tool rotary tables and high-precision semiconductor equipment (usually requiring below 60 arcseconds). Therefore, the high-end five-axis linkage market is still dominated by foreign enterprises.
3. Technological Solutions Reaching a Bottleneck
The current mainstream RV and harmonic technological solutions have gradually reached their technical limits in terms of precision and transmission efficiency, making it difficult to further meet the future demands of China's high-end manufacturing industry for higher precision, higher transmission efficiency, and lower noise.
4. Limitations in Materials and Processes
Taking harmonic reducers as an example, their core component, the flexspline, is prone to fatigue fracture, which places extremely high demands on manufacturing materials and production processes. Currently, domestic manufacturers still lag behind Harmonic Drive Systems in terms of flexspline lifespan.
It is precisely this risk of being subjected to "choke points" and technological monopoly that has greatly generated the sense of urgency and motivation for Chinese local enterprises to pursue domestic substitution.
02. Changing Lanes to Overtake: Original "Self-Backlash Elimination" Technological Path Breaks Foreign Precision Monopoly
Given the steady advancement of China's high-end manufacturing industry, downstream enterprises have increasingly higher performance requirements for automation and other equipment. For example, in the industrial robot industry, reducers are required not only to have higher precision but also a longer precision retention lifespan. Facing the barriers built by foreign enterprises in traditional metal cutting and material processes, it will be difficult for Chinese enterprises to achieve true transcendence in high-precision reducers if they merely choose to follow and imitate.
The "lost motion" of precision reducers is a key indicator of robot positioning accuracy. Referring to the precision classification of mainstream precision reducers, typically, the lost motion of precision reducers is ≤7 arcminutes.
Definition Diagram of Lost Motion and Backlash
(Image Source: "2025 China Precision Reducer Industry Development White Paper")
From a technical perspective, the precision of most reducers is generally beyond 60 arcseconds (1 arcminute), but there are also a few enterprises, such as foreign brands Wittenstein's Alpha series and Melior Motion's PSC products, whose precision generally achieves below 60 arcseconds relying on unique technological advantages. Among them, the PSC reducer adopts a unique planetary gear system with an integrated helical gear stage, as well as patented automatic backlash elimination technology. This technology enables the reducer to automatically compensate for the clearance generated by gear wear during operation, maintaining constant precision, and has become a representative of a new type of precision reducer technology.
Performance Distribution Diagram of Representative Types of Precision Reducers
(Image Source: "2025 China Precision Reducer Industry Development White Paper")
Under the severe challenge of high-end precision reducers being long monopolized by foreign brands and core technologies facing the risk of "choke points", some domestic manufacturers have abandoned the technological routes of following and catching up with Japanese RV and traditional harmonic reducers, and turned to deeply cultivating underlying original technological paths to seek a breakthrough. For example, the domestic precision reducer enterprise Aici Technology, relying on its original "self-backlash elimination" patented structure, has reduced the lost motion of its reducers to below 50 arcseconds, with its high-end series dedicated to machine tools even achieving below 10 arcseconds, far exceeding German reducers in precision.
It is understood that in 2018, Aici Technology originally developed the self-backlash elimination harmonic reducer, which significantly improved transmission precision and torsional rigidity compared to traditional harmonic reducers. In 2021, through independent research and development, Aici Technology originally invented the modified planet carrier self-backlash elimination planetary structure, which once again greatly enhanced the performance of self-backlash elimination planetary reducers, surpassing cycloid, harmonic reducers, and PSC backlash elimination planetary reducers in precision and rigidity.
Based on this technological route, the H3K self-backlash elimination planetary reducer developed by Aici Technology has successfully improved the precision to below 10 arcseconds, far exceeding the domestic mainstream level of above 60 arcseconds, and is specially used in fields such as four- and five-axis machine tools, industrial robots, and semiconductor manufacturing equipment. This means that, without completely relying on top-tier imported processing machine tools, Chinese enterprises have manufactured products with performance indicators surpassing international peers through the wisdom of structural design.
Founded in 2015, Aici Technology spent ten years accumulating experience and researching how to break through the traditional precision reducer technological routes. Ultimately, it chose a path of "changing lanes to overtake", achieving a disruptive advantage on traditional technological routes through structural innovation, and keeping the autonomy of high-end precision reducers in its own hands.
Conclusion
The rise of Aici Technology is a microcosm of China's high-end manufacturing industry stimulating endogenous momentum under external pressure. It proves that, facing external technological blockades and geopolitical risks, China already has the ability to build an independent, autonomous, safe, and controllable supply chain system in future tracks such as industrial robots, precision machine tools, and even humanoid robots through in-depth technological innovation.
The field of precision reducers in China has already demonstrated with practical actions that the autonomy of core technologies is the most solid confidence in the game among major powers.
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