GB/T 44039.1-2024Road vehicles - Drawbar couplings and eyes for rigid drawbars - Part 1: Strength tests for general cargo centre-axle trailers (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 1 of GB/T 44039 "Road vehicles - Drawbar couplings and eyes

for rigid drawbars". GB/T 44039 has issued the following parts.

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

- Part 2.Strength test for special vehicles.

This document has modified and adopted ISO 12357-1.1999 "Commercial road

vehicles - Drawbar couplings and eyes for rigid drawbars - Part 1.Strength tests for

general cargo centre-axle trailers".

The technical differences between this document and ISO 12357-1.1999 and their

reasons are as follows.

a) MODIFY the scope of application, from "centre-axle trailers with axle load

exceeding 3500 kg at maximum design total mass" to "general cargo centre-axle

trailers with a maximum design total mass exceeding 3500 kg" (see Clause 1 of

this document, Clause 1 of ISO 12357-1.1999), to be consistent with the

provisions of GB/T 3730.2-1996;

b) ADD the normatively referenced GB/T 3730.1 (see Clause 3 of this document);

c) DELETE the term and definition of centre-axle trailer (see 3.2 of ISO 12357-

1.1999);

d) DELETE the requirements for flexible components (see 4.5 of ISO 12357-1.1999),

to unify the test requirements;

e) DELETE the requirement that the number of dynamic test cycles for other

materials shall be agreed between the manufacturer and the laboratory (see 6.3 of

ISO 12357-1.1999), to facilitate the understanding and use of the standard;

f) ADD the requirement that the static load shall be maintained for at least 60 s after

reaching the specified value (see Clause 7 of this document), to unify and

standardize the test operation requirements.

This document has made the following editorial changes.

a) In order to coordinate with the existing standards, the name of the standard has

been changed to "Road vehicles - Drawbar couplings and eyes for rigid drawbars

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

Road vehicles - Drawbar couplings and eyes for rigid

drawbars - Part 1.Strength tests for general cargo centre-

axle trailers

1 Scope

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

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

eyes.

This document applies to the strength test of drawbar eyes that meet the requirements

of ISO 1102 and ISO 8755 and matching drawbar couplings that meet the requirements

of ISO 3584 for general cargo centre-axle trailers with a maximum design total mass

exceeding 3500 kg.

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

GB/T 3730.1 Terms and definitions of motor vehicles, trailers and combination

vehicle - Part 1.Types

ISO 1102 Commercial road vehicles - 50 mm drawbar eye - Interchangeability

NOTE. GB/T 4781-2006 Commercial road vehicles - 50 mm drawbar eye - Interchangeability

(ISO 1102.2001, IDT)

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 3584 Road vehicles - Clevis couplings - Interchangeability

NOTE. GB/T 32860-2016 Road vehicles - Drawbar couplings of interchangeability (ISO

3584.2001, MOD)

ISO 8755 Commercial road vehicles - 40 mm drawbar eye - Interchangeability

NOTE. GB/T 44041-2024 Road vehicles - 40 mm drawbar eye - Interchangeability (ISO

8755.2001, IDT)

3 Terms and definitions

For the purpose of this document, the terms and definitions defined in GB/T 3730.1,

ISO 1176, and the following apply.

3.1

S-value

Vertical static load acting on the mechanical connection device of centre-axle trailers

when the drawbar is horizontal and at its maximum design total mass.

4 General requirements

5 Determination of Dc and V values