GB/T 44039.2-2024Road vehicles - Drawbar couplings and eyes for rigid drawbars - Part 2: Strength tests for special applications (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents.

This document is part 2 of GB/T 44039 Road vehicles - Drawbar couplings and eyes

for rigid drawbars. GB/T44039 has been published in the following parts.

-- Part 1.Strength tests for general cargo centre-axle trailers;

-- Part 2.Strength tests for special applications.

This document is modified in relation to ISO 12357-2.2007 Commercial road vehicles

- Drawbar couplings and eyes for rigid drawbars - Part 2.Strength tests for special

applications.

This document has made the following structural adjustments compared to ISO 12357-

2.2007.

a) 5.1 of ISO 12357-2.2007 has been deleted, and the corresponding content has

been adjusted to 5.1.1, 5.1.2, 5.2.1 and 5.2.2 respectively;

b) 5.1 and 5.2 correspond to 5.2 and 5.3 of ISO 12357-2.2007;

c) Figures 1~3 correspond to Figures 2~4 of ISO 12357-2.2007.

The technical differences between this document and ISO 12357-2.2007 and their

reasons are as follows.

a) The scope of application has been changed from "vehicle transport trailer with

a vertical load exceeding 3500 kg at the maximum design total mass" to

"vehicle transport trailer with a maximum design total mass exceeding 3500

kg" (see Chapter 1; see Chapter 1 of ISO 12357-2.2007), which is consistent

with the provisions of GB/T 3730.2-1996;

b) The normative reference ISO 12357-1 has been added (see Chapter 1);

c) The requirements for flexible components (see 4.5 of ISO 12357-2.2007) have

been deleted and the test requirements have been unified;

d) The requirement that the number of cycles for other materials should be agreed

between the coupling manufacturer and the test laboratory (see 6.3 of ISO

12357-2.2007) has been deleted, and the test requirements have been unified;

Road vehicles - Drawbar couplings and eyes for rigid

drawbars -Part 2.Strength tests for special applications

1 Scope

This document specifies the general requirements, determination of Dc and V values,

dynamic tests, static tests and strength requirements for drawbar couplings and

matching drawbar eyes.

This document applies to the strength test of the drawbar eye and the matching drawbar

coupling used in the following vehicle types.

-- Rigid drawbar trailers, with a maximum design total mass exceeding 3500 kg

and with a vertical static load acting on the towing vehicle exceeding 10% of

the maximum design total mass of the trailer and/or greater than 1000 kg but

not exceeding 2000 kg, and the combinations composed of the trailers;

-- Vehicle transport trailers with a maximum design total mass exceeding 3500 kg

and the combinations composed of the trailers.

This document is not applicable to the strength test of drawbar couplings and matching

drawbar eyes as specified in ISO 12357-1.

2 Normative references

The provisions of the following documents constitute the essential clauses of this

document through normative references in this text. Among them, for referenced

documents with dates, only the versions corresponding to the dates are applicable to

this document; for referenced documents without dates, the latest versions (including

all amendments) are applicable to this document.

ISO 1176 Road vehicles - Masses - Vocabulary and codes

NOTE. GB/T 3730.2-1996 Road vehicle - Masses - Vocabulary and codes (ISO 1176.1990, IDT)

ISO 12357-1 Commercial road vehicles - Drawbar couplings and eyes for rigid

drawbars - Part 1.Strength tests for general cargo centre-axle trailers)

NOTE. GB/T 44039.1-2024 Road vehicles - Drawbar couplings and eyes for rigid drawbars - Part

1 Strength tests for general cargo centre-axle trailers (ISO 12357-1.1999, MOD)

UNECE R55-01 Uniform provisions concerning the approval of mechanical

coupling components of combinations of vehicles

3 Terms and definitions

For this document, the terms and definitions defined in ISO 1176 and the following

apply.

4 General requirements