GB/T 43400-2023Road vehicles - Trailers up to 3.5 t - Calculation of the mechanical strength of steel drawbars (English PDF)

Foreword

This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for

Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents.

This Document modified and adopted ISO 7641:2012 Road Vehicles – Trailers up to 3.5t –

Calculation of the Mechanical Strength of Steel Drawbars.

Compared with ISO 7641:2012, this Document made the following structural adjustments:

--- Clause 3 corresponds to 3.1 of ISO 7641:2012;

--- Clause 4 corresponds to 3.2 of ISO 7641:2012;

--- Clause 5 corresponds to Clause 4 of ISO 7641:2012;

--- Adjust the order of Figures 2 and 3 according to the order of citation.

The technical differences and causes between this Document and ISO 7641:2012 are as follows:

--- Delete the normative references in ISO7641:2012. This Document is a document of the

United Nations Economic Commission for Europe. The relevant technical content is the

same as GB/T 15089, so GB/T 15089 is used as a reference;

--- Change the 3.2 coefficient (k) in ISO 7641:2012, and add the value of k when l<=2.5m

(see Table 1), so that the data forms a closed loop;

--- Add the cases of e/l=0.15, ex/lx=0.15 (see 5.3.2), so that the data form a closed loop;

--- Change the MfR in 4.3.3 in ISO 7641:2012 to MfP. Because MfR is not used in the ISO

standard, it was determined after analysis that the symbol MfR shall be MfP.

This Document made the following editorial modifications:

--- Delete NOTE of 3.1.5 in ISO 7641:2012.

Please note some contents of this Document may involve patents. The issuing agency of this

Document shall not assume the responsibility to identify these patents.

This Document was jointly proposed by Ministry of Industry and Information Technology of

the People's Republic of China, and Ministry of Transport of the People's Republic of China.

This Document shall be under the jurisdiction of National Technical Committee of Auto

Standardization (SAC/TC 114).

Drafting organizations of this Document: Research Institute of Highway Ministry of Transport;

Shandong University of Technology; AL-KO (Yantai) Machinery Co., Ltd.; Wuhan University

Road Vehicles – Trailers up to 3.5t – Calculation of the

Mechanical Strength of Steel Drawbars

1 Scope

This Document specifies a simplified calculation process for the bending mechanical strength

of steel drawbars for trailers up to 3.5t.

This Document applies to steel drawbars equipped on center-axle trailers of categories O1 and

O2.

2 Normative References

There are no normative references in this Document.

3 Terms and Definitions

For the purposes of this Document, the following terms and definitions apply.

4 Symbols

The symbols and their meanings in this Document can refer to Table 1 and Figure 1.

......