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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard has been redrafted and modified in relation to Road Vehicles-Drawbar Couplings-Interchangeability (ISO 3584:2001).
The technical deviations, together with their justifications, between this standard and ISO 3584:2001 are as follows:
——In “Table 2 Dimensional Requirements for Frames”, “Fmax” is changed to “Fmin”, for easier understanding and use in China;
——"The drawbar coupling shall satisfy the tests specified in ISO 8718 or ISO 12357 or both." of 5.2 is changed to "The drawbar coupling shall satisfy the relevant requirements specified in GB/T 15087, ISO 12357-1 and ISO 12357-2, depending on the structure type of trailer.", for easy understanding and use;
——Footnotes are added for the values D, Dc, S and V in Table 5 of 5.5.3, to complying with GB/T 1.1.
For easy use, the following editorial modifications are made in this standard.
——3.1 is deleted;
——In Normative References, the national standards which adopt international standards identically and by modification are replaced by corresponding national standards.
This standard was proposed by the Ministry of Transport of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee on Automobiles of Standardization Administration of China (SAC/TC 114).
Road Vehicles—
Interchangeability of Drawbar Couplings
1 Scope
This standard specifies the requirements for the mounting and interchangeability of drawbar couplings on the frame (cross member, drawbeam or mounting bracket) of towing vehicles.
This standard is applicable to drawbar couplings intended for connection to drawbar trailers and centre-axle trailers.
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 4781 Commercial Road Vehicles—50mm Drawbar Eye—Interchangeability (GB/T 4781-2006, ISO 1102:2001, IDT)
GB/T 15087 Road Vehicles - Drawbar Couplings and Eyes for Hinged Drawbars - Strength Tests (GB/T 15087-2009, ISO 8718:2001, IDT)
ISO 8755 Commercial Road Vehicles—40 mm Drawbar Eye—Interchangeability
ISO 12357-1 Road Vehicles—Drawbar Couplings and Eyes for Rigid Drawbars—Part 1: Strength Tests for General Cargo Centre-Axle Trailers
ISO 12357-2 Road Vehicles—Drawbar Couplings and Eyes for Rigid Drawbars—Part 2: Strength Tests for Special Applications
3 Designation of Categories
3.1 Frames in conformance with this standard shall be identified by the following information, in the order given:
a) reference to the standard complied with;
b) number of category according to Table 1.
EXAMPLE Frames according to category 3 of Table 1:
Frame GB/T 32860 – Category 3
3.2 Drawbar couplings meeting the requirements of this standard shall be identified by the following information, in the order given:
a) reference to the standard complied with;
b) code of drawbar coupling, code C 40 for 40 mm drawbar couplings and C 50 for 50 mm drawbar couplings;
c) number of category according to Table 1 or number of class according to Table 4.
EXAMPLE 1 40 mm drawbar coupling according to category 3:
Drawbar coupling GB/T 32860 C 40 - Category 3
EXAMPLE 2 50 mm drawbar coupling according to class 3 of Table 4:
Drawbar coupling GB/T 32860 C 50 - Class 3
EXAMPLE 3 Drawbar coupling according to category 4 of Table 1:
Drawbar coupling GB/T 32860 - Category 4
4 Mounting Categories
4.1 Categories of drilling pattern of drawbar coupling
The dimensions for the categories of drilling pattern (see Figure 1) shall be as given in Table1.
Table 1 Drilling Patterns of Drawbar Coupling
Dimensions in Millimetres
Dimension Category
1 2 3 4 5 6 7
E1 83 83 120 140 160
E2 56 56 55 80 100
D1 — 55 75 85 95
D2 10.5 10.5 15 17 21
Dimensions in Millimetres
Figure 1 Drilling Pattern
4.2 Dimensional requirements on frame for mounting drawbar coupling
Dimensions on the frame required for mounting of the drawbar coupling (see Figure 2), such as the minimum flat surface defined by dimensions F and G, shall be as given in Table 2. Tolerances on drilling pattern dimensions shall be as shown in Figure 1.
Table 2 Dimensional Requirements for Frames
Dimensions in Millimetres
Dimension Category
1 2 3 4 5 6 7
Fmin 120 120 165 190 210
Gmin 95 95 100 130 150
Tmax — 15 20 35 35
L1min — 200 300 400 400
Dimensions in Millimetres
Figure 2 Dimensional Requirements of Frame
5 Drawbar Couplings
5.1 General
The requirements of 5.2 to 5.4 are applicable to all drawbar couplings. The requirements of 5.5 are applicable to C 40 and C 50.
5.2 Load requirements
The drawbar coupling shall satisfy the relevant requirements specified in GB/T 15087, ISO 12357-1 and ISO 12357-2, depending on the structure type of trailer.
5.3 Dimensional requirements
The maximum outer dimensions of all components of the drawbar coupling shall be within the envelope box defined in Table 3 (see Figure 3).
In order to permit safer operation of the drawbar coupling, there shall be adequate free space around actuating devices. Dimensions needed to ensure operating clearance for actuating devices are as shown in Figure 3.
Foreword i
1 Scope
2 Normative References
3 Designation of Categories
4 Mounting Categories
5 Drawbar Couplings
