Rail transit industry
Drive system bearings
Modern railway vehicles combine ride comfort, low noise disturbance and good performance. Our company can design special solutions for drive system bearings according to the application requirements of locomotives, EMUs and rail vehicles.
1. 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
2. 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
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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
