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 5.1 and 6.1);

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);

i) The specimens for the misalignment noise test are modified (see 6.3; 5.6 of Version 2016);

j) The test conditions for the misalignment noise test are modified (see 6.4; 5.7 of Version 2016);

k) The misalignment noise test methods for the sample strips after 60 hours of high-temperature constant tension force life test and for the sample strips that have completed the high-temperature constant tension force life test are modified (see 6.5.2 and 6.5.3; 5.8.2 and 5.8.3 of Version 2016);

l) The failure criteria for the misalignment noise test are modified (see 6.6; 5.9 of Version 2016);

m) The test method for the anti-pilling performance test is added (see Chapter 7);

1 Scope

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 1: Basic Vocabulary

GB/T 6931.2 Belt Drives - Vocabulary - Part 2: V-belts and V-ribbed Belt Drives

GB/T 13552 Automotive V-ribbed Belts

GB/T 33513 Belt Drives - Pulleys and V-ribbed Belts for the Automotive Industry - PK Profile. Dimensions

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

5 High Temperature Constant Tension Force Life Test

6 Misalignment Noise Test

6.5.1.3 Before testing, place the test belts in a storage chamber that meets the test conditions for adjustment. The adjustment time shall comply with the provisions of GB/T 2941.

6.5.1.4 Before each test, use isopropanol or other volatile cleaning agents to clean the pulleys and check to ensure that the pulley surface is free of oil, dust, pulley wear or other contaminants.

6.5.1.5 Randomly select one test belt; store the rest in the storage chamber.

6.5.1.6 Install the test belt on the test bench, and before starting, ensure that all parameters meet the requirements.

6.5.1.7 Set the speed of the driving pulley to (1,000 ± 100) r/min, sine curve input, 33.33 Hz.

6.5.1.8 Set the offset of the adjustable pulley to achieve the required misalignment angle for the V-ribbed belt.

6.5.1.9 Run the test belt for 10 seconds in accordance with test condition 1 in Table 7. During the operation, use a dedicated microphone to test the noise. The microphone shall be positioned between the test pulleys, extending 100 mm beyond the end face of the adjustable pulley.

Record all noise levels and determine the maximum and average noise levels in dB(A), noise duration, noise type (subjective judgment) and belt misalignment angle.

6.5.1.10 Change the belt misalignment angle in 0.5° increments, adjust the test parameters, and in accordance with the requirements of 6.5.1.9, test the noise until all angles between -3° and 3° have been tested or the sample belt shows signs of skipping.

6.5.1.11 Remove the test belt from the test bench and return it to the storage chamber.

6.5.1.12 Repeat steps 6.5.1.9 ~ 6.5.1.11, until all belts have been tested.

6.5.1.13 Repeat steps 6.5.1.9 ~ 6.5.1.12, until each belt has been tested 3 times, with belts randomly selected for each repetition.

6.5.1.14 In accordance with test condition 3 in Table 7, conduct the test. Run the test for 10 seconds while simultaneously using a microphone to test the noise. The microphone shall be positioned between the test pulleys, extending 100 mm beyond the end face of the adjustable pulley. Record all noise levels and determine the maximum and average noise levels in dB(A), noise duration, noise type (subjective judgment), and V-ribbed belt misalignment angle.

6.5.1.15 Change the belt misalignment angle in 0.5° increments, adjust the test parameters, and in accordance with the requirements of 6.5.1.14, conduct noise test, until all angles between -3° and 3° have been tested or the sample belt shows signs of skipping.

6.5.1.16 Remove the test belt from the test bench and return it to the storage chamber.

6.5.1.17 Repeat steps 6.5.1.14 ~ 6.5.1.16, until all belts have been tested.

6.5.1.18 Repeat steps 6.5.1.14 ~ 6.5.1.17, until each belt has been tested 3 times, with belts randomly selected for each repetition.

6.5.1.19 In accordance with test condition 2 in Table 7, conduct the test. Rotate the dry test belt for 10 seconds while simultaneously using a microphone to test the noise. Then, spray water mist for approximately 10 seconds, until the entire belt is thoroughly wetted. Stop spraying (do not test noise during the spraying process), until there are no water droplets on the belt surface.

Simultaneously, use a microphone to test the noise. The microphone shall be positioned between the test pulleys, extending 100 mm beyond the end face of the adjustable pulley.

Record all noise levels and determine the maximum and average noise levels in dB(A), noise duration, noise type (subjective judgment) and belt misalignment angle.

6.5.1.20 Change the belt misalignment angle in 0.5°increments, adjust the test parameters, and in accordance with the requirements of 6.5.1.19, conduct noise test, until all angles between -3° and 3° have been tested or the sample belt shows signs of skipping.

6.5.1.21 Remove the test belt from the test bench and return it to the storage chamber.

6.5.1.22 Repeat 6.5.1.19 ~ 6.5.1.21, until all belts have been tested.

6.5.1.23 Repeat 6.5.1.19 ~ 6.5.1.22, until each belt has been tested 3 times, with belts randomly selected for each repetition.

6.5.2 Sample belts that are subjected to 60-h high-temperature constant tension force life test After the sample belts tested in 6.5.1 are subjected to high-temperature constant tension force life test for 60 h in accordance with Chapter 5, in accordance with the provisions of 6.5.1.1 ~ 6.5.1.23, conduct the test.

6.5.3 Sample belts that have completed high-temperature constant tension force life test After the sample belts tested in 6.5.2 have completed the high-temperature constant tension force life test in accordance with Chapter 5, in accordance with the provisions of 6.5.1.1 ~ 6.5.1.23, conduct the test.