DIN 27204-4:2015-06

Wear, failures and other damage affect the operational safety of railway vehicles. Depending on the wear behaviour, the operating parameters and the current state of the railway vehicles as well as the economic efficiency, a maintenance system shall be defined which ensures that the required technical target state is maintained. This standard DIN 27204-4 "State of railway vehicles - Running gear - Part 7: Steel springing" has been prepared by Subcommittee NA 087-00-15-04 UA "Running gear" of Working Committee NA 087-00-15 AA "Zustand der Eisenbahnfahrzeuge" ("State of railway vehicles") of the DIN Standards Committee Railway (FSF), in coordination with other FSF working committees and the German Commission for Electrical, Electronic and Information Technologies (DKE). The standards of the overall work "State of railway vehicles" represent a uniform and system-compatible normative work which defines the limit state for safe operation as well as processes for compliance with the target state of railway vehicles of standard gauge. The general scope of this standard is therefore defined in DIN 27200:2011-11 in Clause 1 and Subclause 3.1. All documents of the complete work are listed in DIN 27200 Supplement 1. DIN 27204 "State of railway vehicles - Running gear" consists of: - Part 1: remains open - Part 2: remains open - Part 3: Wheel-set bearings and wheel-set bearing guide (withdrawn) - Part 4: Steel springing - Part 5: Rubber suspension systems - Part 6: Pneumatic suspension system - Part 7: Bogie and equipment - Part 8: Tilting technology (withdrawn) - Part 9: remains open - Part 10: Vehicles without bogies. This standard DIN 27204-4 applies to steel springing. It lays down the general provisions for the technical target state of the steel spring types: - coil spring and - leaf spring (trapezoidal and parabolic). The requirements specified in this standard relate to the steel suspension and its - individual parts, - supports, - backings, - guides and - suspensions. This standard shall apply mutatis mutandis in the case of designs deviating from those specified. In the case of combined suspension types (for example, series connection of steel and elastomer springs), the individual springs are subject to the applicable DIN standard of this series of standards. The figurative representations of this standard serve as examples. This standard differs from DIN 27204-4:2005-07 as follows: a) adaptation of the foreword and the scope of application; b) Figure 4, Position 4 revised; c) Figure 5 - gaps of the spring leaf ends newly included; d) Figure 6 was revised and the parameters e1 and e2 were deleted and the percentage deviation p as well as the different diameters newly included; e) the following changes were included in Table 1: 1) serial no. 1, values for the percentage deviation p newly included, 2) serial no. 1.1, revision of marking, 3) serial no. 2, requirement spring eye without burr newly included, 4) serial no. 2.1, spring suspension lubrication points specified; f) bibliography newly included; g) editorially revised.