GB/T 13880-2024 Road vehicles - Fifth wheels - Interchangeability
1 Scope
This document lays down the dimensional characteristics necessary for mounting and interchangeability of the fifth wheel mounted on a mounting plate or on the frame.
It applies to the standard fifth wheels equipped with a 50 coupling pin as defined in ISO 337, the direct-mounted fifth wheels, or the standard fifth wheels equipped with a 90 coupling pin as defined in ISO 4086.
Dimensions not specified are left to the discretion of the component manufacturer.
Test conditions and strength requirements to be met by 50 and 90 fifth wheel coupling are specified in ISO 8717.
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.
ISO 337 Road vehicles - 50 semi-trailer fifth wheel coupling pin - Basic and mounting/interchangeability dimensions
Note: GB/T 4606-2006, Road vehicles - 50 semi-trailer fifth wheel coupling pin - Basic and mounting/interchangeability dimensions (ISO 337:1981, IDT)
ISO 1726 Road vehicles - Mechanical coupling between tractors and semi-trailers - Interchangeability
Note: GB/T 20070-2006, Road vehicles - Mechanical coupling between tractors and semi-trailers - interchangeability (ISO 1726:2000, MOD)
ISO 4086 Road vehicles - 90 semi-trailer fifth wheel kingpin - Interchangeability
Note: GB/T 4607-2006, Road vehicles - 90 semi-trailer fifth wheel coupling pin - Basic and mounting/interchangeability dimensions (ISO 4086:2001, IDT)
ISO 8717 Commercial road vehicles - Fifth wheel couplings - Strength tests
Note: GB/T 20069-2006, Road vehicle - Fifth wheel couplings strength tests (ISO 8717:2000, MOD)
3 Terms and definitions
No terms and definitions are listed in this document.
4 Designation
Fifth wheels meeting the requirements of this document shall be identified by the following details in the order specified:
a) the standard number of this document;
b) code FW 50 for 50 mm fifth wheels and FW 90 for 90 mm fifth wheels according to Clause 5;
c) or code DFW 50 for 50 mm direct-mounted fifth wheels according to Clause 6;
d) number of class of fifth wheel height H according to Tables 1 or 3;
e) class of transversal width (A or B) according to Table 2 for direct-mounted fifth wheels according to Clause 6.
Example 1: 50 mm fifth wheel coupling having a height within the range of class 1:
Fifth wheel GB/T 13880 FW 50-1;
Example 2: 90 mm fifth wheel coupling having a height within the range of class 4:
Fifth wheel GB/T 13880 FW 90-4;
Example 3: 50 mm direct-mounted fifth wheel coupling having a width of Class A and a height within the range of class 1:
Direct-mounted fifth wheel GB/T 13880 DFW 50-1-A.
5 Standard fifth wheels
5.1 Fixing holes
The position of the fixing holes on the mounting plate shall be as shown in Figure 1. The position of the fixingholes on the fifth wheel coupling shall be as shown in Figure 2.
