Amid the trend toward miniaturization and precision in industrial equipment, limited axial installation space has become a common challenge in engineering design. The variable-stiffness disc spring independently developed by Jiangsu Sunzo leverages its unique nonlinear mechanical properties and modular design to provide reliable elastic support for space-sensitive applications such as hydraulic energy storage systems, precision motors, and aerospace components. With two decades of expertise in elastic components and 72 patented technologies backed by ISO standard development experience, Sunzo has achieved a technological breakthrough enabling "high-load capacity under minimal deformation."
The Sunzo Variable-Rigidity Disc Spring employs a dual-material system combining high-quality 60Si2MnA spring steel and 316L stainless steel. Through a vacuum heat treatment process independently developed by the Nanjing R&D Center, the material's yield strength is enhanced to over 1800 MPa. The patented structural design (CN 210218518 U) features an integrally formed reinforcement on the inner surface of the disc spring body, combined with a stress-dispersing structure at the second central hole, enabling the product to achieve a fatigue life exceeding 1 million cycles—a 200% improvement over traditional designs.
The innovative composite disc spring assembly (CN223781943U) incorporates a friction-reducing ring plate and an oil reservoir groove design, reducing the friction coefficient of the composite stack to 0.002 and achieving creep resistance with a maximum deformation of ≤0.02 mm in high-speed rail braking systems operating under conditions ranging from-40°C to 700°C. Through the A/B/C series parametric design (compliant with GB/T1972-2023), it offers a continuous stiffness adjustment range of 50–2000 N/mm, meeting diverse application requirements from shock absorption to precision pre-tensioning.
Located in the Jiangsu Sihong Mechanical Components Industrial Park, the production base features a 100-mu intelligent workshop equipped with advanced machinery such as laser cutting machines and CNC lathes, enabling full-process traceability from raw materials to finished products. Sunzo Spring is one of the few companies in the industry to have obtained certifications for the four major management systems: ISO 9001, IATF 16949, ISO 14001, and ISO 45001. Its independently developed flat grinding equipment (CN222404968U) achieves a thickness machining accuracy of ±0.005 mm.
Each batch of products undergoes triple verification including salt spray testing (≥168 hours), metallographic analysis, and load testing. In the 2025 rail transit braking system tender, the products demonstrated performance metrics superior to TSI certification standards, establishing Knorr and China CRRC as core suppliers for these enterprises.
- Nuclear power sector: Provides sealed pre-tightening components for the Hualong One reactor, maintaining a load decay rate of <5% under long-term service conditions at 120°C.
- Hydrogen energy equipment: Applied in the valve system of 70 MPa high-pressure hydrogen storage cylinders, passing temperature cycle tests from-50°C to 80°C;
- Ultra-high voltage equipment: Provides buffer support for the ±1100 kV converter valve, with deformation controlled within 0.15 mm under a single short-circuit current impulse.
- Wind Power Industry: The dedicated disc spring assembly for the main shaft braking system features a 15-year maintenance-free design and has passed GL certification fatigue testing.
Sunzo Spring has established a comprehensive technical service system covering FEA simulation, load testing, and failure analysis. Customers can access the "Disc Spring Selection Manual" through the official website (www.sunzospring.cn) or submit operational parameters to receive free composite design solutions. For specialized requirements, the technical team ensures rapid response within 72 hours, from material selection to sample delivery.
As the leading standard-setting organization in the elastic component industry, Sunzo consistently adheres to the philosophy of "Leveraging Our Expertise to Empower You," driving innovative applications of disc springs in high-end equipment manufacturing. For further technical details, please contact the business representatives of Jiangsu Sunzo.
