GB/T 33206-2025Performance testing of automotive V-ribbed belts (English PDF)

Foreword

This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part

1.Rules for the Structure and Drafting of Standardizing Documents. This document serves as a replacement for GB/T 33206-2016 Performance Testing of Automotive V-ribbed Belts. In comparison with GB/T 33206-2016, apart from structural adjustments and editorial modifications, the main technical changes are as follows:

a) Terms and definitions are added (see Chapter 3);

b) The purpose is deleted (see Chapter 3 of Version 2016);

c) The requirements for test belts, pulleys and laboratory ambient temperature are added (see Chapter 4);

d) The test purposes for high-temperature constant tension force life test and misalignment noise test are added (see

e) Test parameter 2 in Table 2 is modified (see 5.2.4;

4.1.4 of Version 2016);

f) The specimens for the high-temperature constant tension force life test are modified (see 5.3;

4.3 of Version 2016);

g) The test conditions for the high-temperature constant tension force life test are modified (see 5.4;

4.4 of Version 2016);

h) The failure criteria for the high-temperature constant tension force life test are modified (see 5.6;

4.6 of Version 2016);

1 Scope

GB/T 33206-2025 is the Chinese national standard covering testing the serpentine belt - the tensile and modulus of the belt, the durability run at temperature, the noise and the misalignment tolerance, and the resistance to oil, ozone and cold cracking on a component whose failure stops the car. It replaces GB/T 33206-2016, in force from 1 May 2026. It was issued on 31 October 2025 and has been in force since 1 May 2026, replacing GB/T 33206-2016. The document is under the responsibility of the China Petroleum and Chemical Industry Federation. This page is published from the official record of the 2025 edition; the clause text of a standard this recent is not yet in circulation, and the figures, limits and tables it contains are those of the document itself, delivered in full with the English translation.

This document describes the performance testing methods for PK profile automotive V-ribbed belts (hereinafter referred to as the "belts"). It includes high-temperature constant tension force life test, misalignment noise test, anti-pilling performance test, high and low temperature cycling test, contamination test, and five-pulley flexural test methods. This document applies to V-ribbed belts used in the transmissions of automotive internal combustion engines, such as fans, motors, water pumps, compressors, power steering pumps and turbochargers, etc. This document does not apply to elastic V-ribbed belts.

2 Normative References

The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 2941 Rubber - General Procedures for Preparing and Conditioning Test Pieces for Physical Test Methods

GB/T 6931.1 Belt Drives - Vocabulary - Part

3 Terms and Definitions

The terms and definitions defined in GB/T 6931.1 and GB/T 6931.2 are applicable to this document.

4 Test Belts, Pulleys and Laboratory Ambient Temperature

4.1 Test Belts The test belts shall conform to the provisions of GB/T 13552, with an effective specimen length of (1,200 10) mm. Test data are applicable to all belt lengths manufactured under the same structure and conditions.

4.2 Test Pulleys The test pulleys shall conform to the manufacturing tolerances specified in GB/T 33513, with a wheel diameter tolerance controlled within

0.1 mm and a groove angle tolerance controlled within 0.5.

4.3 Laboratory Ambient Temperature The laboratory ambient temperature for the performance test methods in Chapter 5, Chapter 6, Chapter 8, Chapter 9 and Chapter 10 shall be 18 C ~ 32 C, and the ambient temperature for the performance test methods in Chapter 7 shall be (21 5) C, or as agreed upon by the supply- side and the demand-side.

5 High Temperature Constant Tension Force Life Test

5.1 Test Objective To test the durability of the belts under high temperature and high load conditions.

6 Misalignment Noise Test

6.1 Test Objective To determine the noise performance of the belt under different degrees of axial misalignment and environmental conditions.