In recent years, Japanese companies—led by Nabtesco—have been accelerating the localization of their core components in China, while domestic manufacturers of harmonic reducers have also begun to catch up.

　　In particular, the recent release of the national standard for “Harmonic Gear Reducers for Robots” has once again drawn widespread attention from the industry to domestic harmonic reducer manufacturers.

　　The standard “Harmonic Gear Reducers for Robots” primarily covers classification principles, technical requirements, and performance specifications for harmonic gear reducers used in robotics. It specifies key technical parameters such as product model designations, classification criteria, temperature rise, and service life, along with the corresponding test methods and testing equipment.

　　“The formulation of the new standard will further guide the development of domestically produced harmonic reducers and play a catalytic role.”

　　In general, reducers account for roughly 34% of a robot’s cost, making them one of the most expensive components. However, the development of domestically produced reducers has long lagged behind, earning them the reputation as a persistent bottleneck and a major challenge in the advancement of China’s robotics industry.

　　Several domestic robotics manufacturers and heads of integration businesses have stated that, while the development of the new standard will inject fresh momentum into the growth of China’s harmonic reducer industry, their products still have a long way to go before they can compete with those of foreign brands.

　　Key technologies are controlled by foreign companies.

　　Currently, only three companies worldwide are capable of mass-producing robotic harmonic reducers: Germany’s Harmonic Drive AG, which handles sales in Europe, the Middle East and North Africa, and South America; the U.S.-based Harmonic Drive L.L.C., responsible for North American sales; and Japan’s Harmonic Drive Systems Inc., which covers all other global markets. Notably, the U.S. division of Harmonic Drive has been fully acquired by the Japanese parent company, while the German division is also 30% owned by Harmonic Drive Systems Inc.

　　Accordingly, nearly all of the major harmonic reducers used in industrial robots are manufactured by Japan’s Harmonic Drive Systems Inc.

　　Because Japan’s Harmonic Drive products have already captured major international markets, they hold significant pricing power. Moreover, Harmonic imposes nearly stringent requirements on its partners: “Harmonic enters into a contract with each partner stipulating that, during the supply period for Harmonic Drive products, they may neither use nor test products from other manufacturers; failure to comply will result in the suspension of supply.” To date, no robotics company has dared to truly challenge Harmonic’s dominance.

　　According to reports, harmonic reducers are primarily used in articulated robots. Over the past two years, shipments of industrial articulated robots have grown rapidly, driving a sharp increase in demand for corresponding reducers. Statistics show that global shipments of industrial articulated robot reducers totaled 730,000 units in 2013, up 6% year over year; by 2014, shipments are expected to reach 820,000 units, representing a 12% year-over-year increase.

　　However, despite the steadily growing demand for harmonic reducers and the ever‑expanding profit margins, the vast majority of those profits end up in the hands of Japan’s Harmonic Drive Systems.

　　For domestic RV reducer manufacturers, a host of challenges—including weak technological capabilities, high manufacturing costs, low profit margins, and immature market development—have already placed them under significant strain. Coupled with the market and technological barriers imposed by foreign firms, their survival prospects are particularly precarious.

　　Domestic manufacturers face a tough “breakthrough.”

　　In fact, China’s research on harmonic drive technology can be traced back to the 1960s and 1970s.

　　As early as 1961, China established the Beijing Transmission Research Institute to conduct research on harmonic drive technology and achieved several notable results. Subsequently, led by project leader Li Kemei, six key researchers each went on to found harmonic‑drive companies—namely Beijing Zhongji Kemei Harmonic Drive Co., Ltd. (hereinafter “Zhongji Kemei”) and the Beijing Harmonic Drive Technology Institute (hereinafter “Beijing Transmission Institute”)—and collectively developed a variety of harmonic gear‑drive mechanisms.

　　“Most of the products from this batch of companies are still based on older technologies. While they can be used in standard equipment without issue, they have failed to keep pace with the evolving demands of the robotics industry.”

　　At present, China’s manufacturing capabilities for harmonic reducers are still comparable to those of Japan in the 1970s and 1980s. The main challenges facing the domestic harmonic drive industry include poor precision and inadequate precision retention, limited load-carrying capacity, high noise levels, outdated production equipment, a limited product range, small enterprise sizes, and insufficient R&D personnel and investment.

　　The “lifespan” limitation of domestically produced reducers has long been a key technical bottleneck that deters many Chinese robot manufacturers and system integrators from adopting domestic harmonic reducers. Given the high cost of robots, the durability of their critical components naturally becomes a decisive factor for end‑users.

　　The service life of a robot reducer has two key aspects: one is its practical lifespan, defined as the point at which the reducer fails; the other is its precision‑related lifespan, which refers to the number of continuous operating hours before the harmonic reducer’s accuracy degrades. According to the current qualification standard for harmonic reducers, a unit is considered compliant only after it has operated for 6,000 hours.

　　“The real challenge lies in the application of harmonic reducers in robotics.” Manufacturers of reducers lack a deep understanding of robotics, while robotics companies are equally unfamiliar with reducer technology. This information asymmetry prevents the development of a cohesive system design, inevitably compromising the overall lifespan of the robot.

　　“At present, the primary challenge in the development of domestically produced harmonic reducers lies not in their lifespan or performance, but in the application of design guidelines at the user end during operation.” According to testing data for domestic harmonic‑drive products used in industrial robots, their service life is already comparable to that of Japanese‑made counterparts.

　　For example, foreign‑owned robotics companies such as ABB and KUKA have accumulated considerable experience in robot R&D and manufacturing. They employ highly rigorous industrial‑control processes for robot assembly and process equipment, with meticulous attention to detail—down to specifying how many automatic torque applications are required for each screw.

　　Due to their relatively short development history and limited experience, coupled with the fact that China’s industrial control equipment sector lags far behind its international counterparts, domestic harmonic reducers face significant challenges in robot applications—challenges stemming from a lack of rigorous standards in assembly precision and accuracy control.

　　This is also a key reason why many domestic and international robotics companies prefer to opt for foreign‑made products—foreign firms possess well‑established, proven implementation expertise.

　　In addition, the lengthy testing cycles and high costs represent another major hurdle to the adoption of harmonic reducers in robotics. Domestic robot manufacturers generally lack the willingness to take risks; rather than investing substantial time, resources, and capital in testing new products, they typically opt for expensive foreign‑made solutions that are backed by established expertise.

　　Hoping to capture market share with price advantages.

　　According to a recent report by the Nikkei, Nabtesco, a Japanese leader in control equipment, will begin manufacturing core components for industrial robots in China starting in 2016. Japanese robotics firms are steadily accelerating their expansion in China, with their strategic footprint shifting from complete robot systems to increasingly specialized core parts.

　　Some industry insiders question that, for domestic core-component manufacturers still in their infancy, this measure amounts to adding insult to injury.

　　It is readily apparent that companies opting for domestically produced harmonic reducers are primarily motivated by their attractive price. However, as Japanese firms establish localized production in China, the cost advantage of domestic harmonic reducers may soon erode.

　　Therefore, finding a breakthrough strategy tailored to their specific circumstances is of paramount importance for domestic harmonic reducer manufacturers.

　　In the view of many industry insiders, domestic harmonic reducer manufacturers can forge partnerships with robot makers and system integrators to jointly overcome technological barriers, leverage synergies, and steadily reduce costs, thereby gradually enhancing the market bargaining power of Chinese suppliers.