Registered Chinese name恩福贸易（上海）有限公司Nok-freudenberg Group Trading (China) Co., Ltd.
Enfu (China) is deeply involved in the sealing industry, integrating the top sealing technologies of Japan's NOK and Germany's Freudenberg, and has strong material R&D and design c…
Waterproof sealing IPSR for humanoid robotsSoft metal gasketHTCY oil sealHRE oil seal
Enfu (China) is deeply involved in the sealing industry, integrating the top sealing technologies of Japan's NOK and Germany's Freudenberg, and has strong material R&D and design capabilities. It has more than 1,600 product portfolios and provides high-quality sealing solutions and value-added services to various industries.
The company is deeply involved in the field of industrial robots and develops high-precision and low-friction seals to achieve durable and low-consumption operation of equipment; it can complete design, modeling and production in one stop in China, reducing costs and improving efficiency for customers. At the same time, the humanoid robot track is laid out, precision sealing is customized for multi-joint structures, and core components such as reducers, motors, and sensors are adapted, which has the advantages of dustproof, anti-seepage, and lightweight.
The company holds a number of patents and creates IP67 protective oil seals and new food-grade materials. The product performance is better than industry standards and is widely used in high-end fields such as machinery, food, medical, and humanoid robots.
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MAIN PRODUCTS
Key Products
10 ITEMS
01
Waterproof sealing IPSR for humanoid robots
IPSR uses an innovative Z-shaped geometry and a unique solid film lubricating coating to effectively distribute mechanical loads and significantly reduce friction and wear. Compared with traditional spring-supported seals, IPSR eliminates mechanical fatigue issues and maintains smooth robot motion, ensuring long-term performance.
In addition, IPSR has IP67 waterproof and dustproof protection, which is suitable for axial and radial movement of finger joints. Its optimized contact pressure reduces friction in joints, lowers heat generation, extends component life, reduces maintenance requirements and prevents major operational disruptions due to downtime.
02
Soft metal gasket
A special gasket with a thin plate of iron, stainless steel or aluminum as the core and covered with rubber. The rigidity of the metal is combined with the elasticity of the rubber to form a sealing product that can absorb shock and reduce noise at the same time. The sealing part is designed with fine bead shapes to further enhance the sealing performance; the base material is not easily deformed or damaged, making it easy to assemble or disassemble.
03
HTCY oil seal
The low-torque and small-section design based on the TC-type oil seal makes the robot's operation process more precise, consumes less energy, and generates less frictional heat, thereby extending the overall life of the robot. It is mainly used in large RV precision reducers and is also suitable for small harmonic reducers. In addition, the dust-proof lip adopts a low-torque design, which can achieve sealing and low torque at the same time. It can still exert stable performance after long-term use. According to the needs of different torque amounts, customized sealing solutions are provided.
04
HRE oil seal
The oil seal is specially designed for the characteristics of the reducer. In addition to the main lip, there are an inner lip and an outer lip to prevent the intrusion of internal and external dirt. The special design of the three lips can prevent the intrusion of internal and external foreign matter, and effectively cope with the frequent alternation of forward and reverse rotation during robot operation. In addition, the low-torque design can extend the service life of the oil seal.
05
PTFE sheet seal
The internal structure of humanoid robots is complex and requires precise lubrication. In an extremely small and limited space, a reliable sealing effect must be provided to ensure that the lubricant in the body will not leak out. In this case, PTFE sheets with single-sided widths as low as 3mm can play an important role.
06
PSS oil seal
PSS oil seal is an oil seal specially designed for low friction requirements. It hardly wears the shaft surface, can effectively reduce the temperature increase caused by friction during operation, and prolong the service life of the rubber material. In addition, its high pump suction design improves the robustness of the sealing effect. Combined with the unique sine wave lip design, the lip is always lubricated by grease. At the same time, it can effectively resist the debris generated by metal seizure wear inside the gearbox, which can further extend the service life of the oil seal.
07
Silicon gasket/rear cover
The silicon gasket has good elasticity and fit, and can form a reliable seal between the rear cover and the casing to prevent the intrusion of foreign matter. At the same time, it can adapt to minor deformations during joint movement and maintain a long-term sealing effect. The rear cover can exert a good heat dissipation effect according to the shape and design requirements of the cover groove, ensuring that the motor can run normally for a long time.
08
Busbar
By using a primer to chemically pretreat the conductor surface, and then applying a special elastic coating to seal the medium, the heat dissipation problems caused by the notch effect at the edge of the conductor can be significantly reduced, connecting the motor and the driver to achieve large currents in a low-loss manner; at the same time, the elastic coating significantly reduces the notch effect at the edge of the conductor, thereby reducing the possibility of stress cracking of electronic components.
09
protective cover
Enfu's innovative protective covers can be applied to the robot's joints and foot pedals. This product uses innovative damping rubber materials, which have excellent vibration absorption and anti-wear functions. It can effectively reduce the vibration of the humanoid robot when it walks, making its operation more stable. It can also improve the noise and heating problems caused by the robot's operation.
10
sheet seal
The ultra-thin structure can meet the compact design requirements of the joint and achieve reliable sealing in a very small installation space; the low friction and high wear resistance characteristics can reduce energy consumption and heat generation, ensuring long-term stable operation.
Nok-freudenberg Group Trading (China) Co., Ltd. | Company Profile & Products | WRC 2026
