GB/T 40325-2021
Performance test for rubber sealing device of railway vehicle wheel rolling bearing (English Version)
- Standard No.
- GB/T 40325-2021
- Language
- Chinese, Available in English version
- Release Date
- 2021
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 40325-2021
- Scope
- This document specifies the performance test methods for rubber sealing devices of rolling bearings in rail vehicle wheelsets. This document is applicable to the performance judgment of the rubber sealing device of rolling bearings in rail vehicle wheelsets (hereinafter referred to as sealing devices). Note: For performance testing of non-rubber sealing devices, please refer to this document.
- Introduction
Analysis of the core content of the standard
This standard establishes a complete evaluation system including 7 categories and 17 performance indicators for the systematic test method of rubber seals for rolling bearings of rail vehicle wheelsets. The standard innovatively transforms mechanical motion parameters such as axial movement and eccentric rotation in actual working conditions into test conditions that can be quantified and controlled.
Comparison of key technical requirements
Test items Temperature range(℃) Number of cycles Key indicators Sealing performance test Room temperature 600,000-800,000 km equivalent Leakage ≤30g Dynamic high temperature test 95±3 10 cycles Hardness change≤10 Dynamic low temperature test -45±3 19 cycles Starting torque ≤1.68N·m
Key technical parameters of the test equipment
The standard requires that the test equipment must meet the following requirements:
- Speed control accuracy ±3%
- Dynamic eccentricity ≤0.03mm
- Axial movement 0-2mm adjustable
- Pulse pressure 0.011MPa±5%
The equipment is specially required to be equipped with a dual-axis coaxiality adjustment system to ensure that the coaxiality error between the main shaft and the test shaft is less than 0.05mm.
Material compatibility key control points
According to the requirements of Appendix A, the elastomer material needs to pass the 28-day accelerated aging test:
- The volume change of fluororubber after immersion in grease at 200℃ is ±10%
- The hardness change of hydrogenated nitrile rubber after 150℃ test is ±10IRHD
Implementation suggestions
- Give priority to the metal skeleton lip seal ring structure recommended by the standard
- Establish a temperature-speed-pressure linkage calibration mechanism for the test equipment
- It is recommended to add micro-morphology analysis as a supplementary evaluation method
GB/T 40325-2021 Referenced Document
- GB/T 13270 Aemospheric air--Test dust standand sample--Simulated atmospheric dust
- GB/T 13871.1 Rotary shaft lip-type seals incorporating elastomeric sealing elements—Part 1:Dimensions and tolerances*， 2022-10-14 Update
- GB/T 13871.2 Rotary shaft lip-type seals incorporating elastomeric sealing elements.Part 2:Vocabulary
- GB/T 15326 Appearance quality for rotary shaft lip seals
- GB/T 1690 Rubber,vulcanized or thermoplastic.Determination of the effect of liquids
- GB/T 260 Test method for water in petroleum products.Distillation method
- GB/T 6031 Rubber, vulcanized or thermoplastic—Determination of hardness (hardness between 10 IRHD and 100 IRHD)
- SH/T 0327 Lubricating Grease Ash Content Determination
- TB/T 3419 Railway wagon bearing oil seal
GB/T 40325-2021 history
- 2021 GB/T 40325-2021 Performance test for rubber sealing device of railway vehicle wheel rolling bearing