QC/T 242-2024Static unbalance requirements and test methods of vehicle wheels (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 QC/T 242-2014 Static Unbalance Requirements and Test Methods of Vehicle Wheels. In comparison with QC/T 242-2014, apart from structural adjustments and editorial modifications, the main technical changes are as follows:

a) The terms and definitions are modified (see Chapter 3; Chapter 3 of Version 2014);

b) The requirements for valve configuration for the test of light alloy wheels are modified (see Chapter 4; Chapter 4 of Version 2014);

c) The requirements for the test equipment are added (see Chapter 5);

d) The requirements for the amount of static unbalance of light alloy wheels on commercial vehicles are modified (see Chapter 6; Chapter 5 of Version 2014);

e) The test methods are modified (see Chapter 7; Chapter 6 of Version 2014).

Please be noted that certain content of this document may involve patents. The institution issuing this document does not undertake the responsibility of identifying these patents.

1 Scope

This document specifies the requirements and test methods for the static unbalance of vehicle wheels.

This document is applicable to the determination of static unbalance of vehicle wheels.

2 Normative References

The content of the following documents constitutes indispensable clauses of this document through 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 2933 Wheels and Rims for Pneumatic Tyres - Vocabulary, Designation and Marking

GB/T 6444 Mechanical Vibration - Balancing - Vocabulary

3 Terms and Definitions

The terms and definitions defined in GB/T 2933 and GB/T 6444, and the following are applicable to this document.

4 Test Samples

4.1 The test samples shall be new and unused wheels.

5 Test Equipment

The selection and evaluation of balancing machines shall comply with the provisions of GB/T 9239.21.

6 Requirements for the Amount of Static Unbalance

7 Test Methods

7.1 In accordance with the wheel model, enter the necessary parameters. If necessary, install the valve (equivalent replacement or set the automatic compensation value of the equipment).

7.2 Install the wheels and start the balancing machine, so as to test the amount of static unbalance (or static unbalance mass) and the angle of static unbalance of the wheels.

7.3 After the wheels stop rotating, the test ends.