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Standards Development
This document is applicable to helical steel suspension springs used in the suspension of rail vehicles.
It deals specially with cylindrical compression springs made from round section steel bars of constant diameter and with constant inclination of coiling.
It deals also with helical springs with different shapes (e.g. conical and/or inclination of coiling not constant and/or steel bar with other cross sections, etc.).
This document gives guidance for:
— design;
— specification of technical and quality requirements;
— the approval procedure and quality assurance of production methods;
— the examinations and tests to be carried out;
— the delivery conditions.
1. Purpose
ISO 22749-1:2021 and ISO 22749-2:2021, elastomer-mechanical parts used in suspension of rail vehicles,have been developed in ISO/TC269/SC2/WG5.
Helical steel suspension springs are also widely used in suspension of rail vehicles. The regional/national standards for helical steel suspension springs (e.g. EN13298:2003, TB/T2211-2018, JIS E 4206:1989 and GOST1452:2011, etc.) have been developed.
The NP is aimed to develop an ISO standard for helical steel suspension springs based on EN 13298: 2003.
2. Technological benefits
The features of helical steel suspension springs are:
— Stable deflection and stiffness performance;
— Good isolation performance for low frequency vibration;
Failure of the helical steel spring could lead to poor dynamic performance or even derailment. The document intends to specify technical requirements and test methods of helical steel springs, so as to provide users with more reliable helical springs.
3. Economical benefits
Enable vehicle manufacturers to achieve global procurement and reduce procurement cycle and cost.
Enable vehicle operators to simplify management and reduce maintenance cost.
Enable testing institutions to reduce equipment types and avoid repeated testing.
Enable spring manufacturers to achieve global sales and improve the interchangeability of components.
4. Environmental benefits
No poisonous material is used for helical steel suspension springs, thus do no harm to the environment.
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