The secondary suspension system is a suspension system that links the frame and the car body. It also includes springs, damping, and positioning mechanisms. At the same time, it also restricts the side turning of the car body.
There are two main types of suspension systems used in trains, both of which are involved with springs.
The primary suspension consists mainly of a normal spring damper system which supports the structural suspension of the carriage and entire train. These damper systems are present in every bogie existing between the axle box and the bogie.
The primary springs link the axle box to the bogie frame.It reduces forces and vibrations and help to prevent derailment.
| Parameters | |
| Wire diameters(d) | 12-70mm |
| Coil diameters(D) | 60-500mm |
| Free height(L0) | 180-1000mm |
| Weight(Kg) | 4-160 |
| Number of active coil(N) | 3-12 or depend on drawing |
| Elements | Internal spring and external spring |
| Materials | 60Si2Mn, 60Si2MnA, 60Si2CrVA, 60Si2CrVAT,50 CrV4, 51CrMoV4 and so on |
| Certifications | ISO 9001,UIC 822 DIN 2096,EN 13298. |
| Usage | Bogie of K2, K4, K8, Y25 with axle load of 21t, 22.5t, 25t etc. |
| Export destination | We have exported to Vietnam, Pakistan, Namibia, Venezuela, Burma, Thailand, Angola,Sudan, Australia, etc. |
Springs can be manufactured according to customer's requirement.
The primary springs link the axle box to the bogie frame.It reduces forces and vibrations and help to prevent derailment.
| Wire diameters(d) | Coil diameters(D) | Free height(L0) | Weight(Kg) | Number of active coil(N) |
| 12-70mm | 60-500mm | 180-1000mm | 4-160 | 3+ |
