Rail transit industry
I. Core Positioning and R&D Capability
ZYS, as the national technical focal point for the bearing industry, has long been dedicated to fundamental theory and applied technology research in rolling bearings. It has accumulated profound technical expertise and extensive achievements in the R&D, design, and engineering application of both general-purpose and specialized bearings.
Leveraging a well-established R&D system, the company systematically conducts core technology development in areas such as bearing optimization design, simulation validation, vibration and noise control, sealing performance analysis, and life and reliability research. By proficiently utilizing advanced CAE simulation tools including ANSYS and Marc, ZYS achieves digitalized bearing design and precise performance optimization, significantly enhancing product stability and service life.
In terms of scientific innovation, the company has led and undertaken numerous national, provincial, and industry-level key research projects. These include specialized rail transit projects such as finite element analysis of tapered roller bearings for railway freight cars. Through these efforts, ZYS has overcome multiple critical technical challenges and established a mature technological system for bearing simulation analysis and structural optimization.
Over the years, the company has strategically focused on the R&D of rail transit bearings. Addressing key requirements such as high speed, heavy load, high reliability, and long service life, it has carried out systematic research on design theories and development methodologies, building strong technical reserves and robust engineering capabilities.
II. Materials, Processing and Testing Capability
The company is equipped with internationally advanced Aichelin heat treatment production lines from Austria. Through in-depth research on material properties and heat treatment processes, it continuously optimizes process parameters and has developed a comprehensive, stable heat treatment technology system, effectively improving the impact resistance and fatigue resistance of bearing materials.
In the field of inspection and testing, the company possesses a solid research foundation in bearing inspection, metrology, failure analysis, experimental techniques, and reliability theory. It serves as the affiliated entity of the National Bearing Quality Supervision and Inspection Center, undertaking product quality supervision and arbitration testing for China's bearing industry.
The company is equipped with first-class testing technologies and laboratory facilities. Utilizing dedicated railway bearing test rigs, it conducts simulation and durability tests to systematically verify bearing performance under actual operating conditions, providing strong assurance for product quality and reliability.
III. Quality Management and Technical Support
The company has established a comprehensive quality control system, with its products and services certified under the ISO 9001 quality management system. This ensures full-process quality control from design and manufacturing to delivery, providing all-round assurance of product quality.
In addition, the company offers professional technical service capabilities, providing customers with full lifecycle technical support including bearing installation, disassembly, maintenance, and application. These services effectively enhance bearing performance and ensure the safety and stability of vehicle operations.
IV. Product Portfolio and Application in Rail Transit
The company has developed a relatively complete product portfolio for rail transit bearings, including axle box bearings, gearbox bearings, traction motor bearings. These products are widely applied in various rail transit equipment such as speed-up trains, high-power locomotives, urban rail vehicles, and metro systems.
Among them, the company's 250 km/h high-speed railway gearbox bearing series has already been deployed for installation and operational testing. The products demonstrate stable and reliable performance, showing strong potential for further engineering application.
Link: The list of our company's bearing product models for rail transit industry
Traction motor bearings
The rolling bearings used in traction motors must meet the challenging requirements of reliable operation and long service life. Our company can adopt personalized design concepts for special designs based on actual use needs, and rely on advanced process technology and a complete quality assurance system to ensure that each set of bearings has excellent performance and high reliability. Cylindrical roller bearings and deep groove ball bearings are usually used in traction motors. Single-row cylindrical roller bearings have advantages over other conventional bearings because their inner rings are particularly easy to separate from the roller cage outer ring assembly. This feature is extremely beneficial for the installation, disassembly, maintenance and inspection of bearings. Cylindrical roller bearings are particularly suitable for bearing high radial forces. NJ and NUP cylindrical roller bearings can also bear some axial forces. The modified line contact between the rolling elements and the raceways avoids edge stresses. Their calculated life can usually reach 2 million kilometers due to the following special design. ◆ Special cage design improves friction and running performance ◆ Optimized internal structure design improves load-bearing capacity and reduces friction torque ◆ Optimized design accuracy and internal clearance ◆ Effective insulation
Gearbox bearings
◆ The main function of rolling bearings in gearboxes is to stabilize the shaft and support the transmission force. This means that they must withstand extreme loads in complex environments. The main requirements for gearbox bearings are: high speed, high load, vibration and impact resistance, high temperature resistance, high rotation accuracy, and compact design. ◆ Gearbox bearings are mainly tapered roller bearings, four-point contact ball bearings and cylindrical roller bearings, as well as deep groove ball bearings, spherical roller bearings and angular contact ball bearings. The bearing configuration varies, mainly depending on the design and operating conditions of the gearbox. ◆ Tapered roller bearings are separable bearings, whose inner ring assembly and outer ring can be separated and assembled separately. The modified line contact between the rolling element and the raceway avoids edge stress. It can withstand high radial and axial loads at the same time. Because this type of bearing can only withstand unilateral axial force, in order to transmit the axial load in the opposite direction and balance the internal eccentric force, another tapered roller bearing installed symmetrically with it is required. ◆ The four-point contact ball bearing is a single-row angular contact ball bearing. It can bear axial loads in both directions at the same time. It is usually used in pairs with cylindrical roller bearings that bear radial forces and has a loose radial fit. In low friction, especially at high speeds, the minimum axial load is required. The split structure of the inner ring allows it to accommodate more steel balls. ◆ The design of the gearbox bearing is based on the structural dimensions of the gearbox, and taking the above factors into consideration, the following special design is adopted, and the general calculated life span can reach 1.5 million kilometers. ● Enhanced internal design ● Special cage design ● Improved accuracy and adjust internal clearance ● Ring with retaining groove design to prevent rotation
Axlebox bearings
Axlebox bearings are subject to the extreme loads occurring between wheelset and bogie frame and must meet a wide range of different technical requirements. Through close cooperation with vehicle manufacturers, our company has developed optimized axle box bearing products for actual operating environments and conducted performance tests and assessments in accordance with DIN EN standards. Products include: ● 250km/h and 350km/h high-speed rail axlebox bearings ● 120-160km/h high-speed railway passenger car axlebox bearings ● Internal combustion and electric locomotive axlebox bearings ● Subway and urban rail vehicle axlebox bearings The double-row tapered roller bearing used for high-speed rail axle box bearings is a bearing unit with complete sealing. It has been filled with grease and the clearance has been adjusted before delivery and installation. Due to the following design, it can meet the requirements of high speed, long life and high reliability. ● High-performance materials and special heat treatment processes ensure high performance of the bearings ● Reinforced design improves the bearing's load capacity and extends its service life ● Roller raceway profile modification and matching optimization design to obtain the best contact stress distribution state ● Optimized design of flange and ball base surface to improve film-forming ability and lubrication ● Special cage design and optimized guide surface to adapt to more challenging operating conditions ● Improve precision level, reduce friction, adapt to higher operating speeds, reliable lubrication and high-performance sealing
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Headquarter: East Wing Building, No. 121 Wutong Street, High-Tech Industrial Development Zone, Zhengzhou City, Henan Province, China
No. 1 Factory Address: No. 6 Fenghua Road, Luoyang City, Henan Province, China
No. 2 Factory Address: No. 1 Sanxi Road, Science and Technology Industrial Park, Jianxi District, Luoyang City, Henan Province, China
No. 3 Factory Address: Yibin Industrial Technology Park, Yibin District, Luoyang City, Henan Province, China
